diff options
Diffstat (limited to 'diff.c')
| -rw-r--r-- | diff.c | 7287 |
1 files changed, 7287 insertions, 0 deletions
@@ -0,0 +1,7287 @@ +/* + * Copyright (C) 2005 Junio C Hamano + */ +#include "git-compat-util.h" +#include "abspath.h" +#include "base85.h" +#include "config.h" +#include "convert.h" +#include "environment.h" +#include "gettext.h" +#include "tempfile.h" +#include "quote.h" +#include "diff.h" +#include "diffcore.h" +#include "delta.h" +#include "hex.h" +#include "xdiff-interface.h" +#include "color.h" +#include "attr.h" +#include "run-command.h" +#include "utf8.h" +#include "object-store-ll.h" +#include "userdiff.h" +#include "submodule-config.h" +#include "submodule.h" +#include "hashmap.h" +#include "mem-pool.h" +#include "merge-ll.h" +#include "string-list.h" +#include "strvec.h" +#include "graph.h" +#include "oid-array.h" +#include "packfile.h" +#include "pager.h" +#include "parse-options.h" +#include "help.h" +#include "promisor-remote.h" +#include "dir.h" +#include "object-file.h" +#include "object-name.h" +#include "read-cache-ll.h" +#include "setup.h" +#include "strmap.h" +#include "ws.h" + +#ifdef NO_FAST_WORKING_DIRECTORY +#define FAST_WORKING_DIRECTORY 0 +#else +#define FAST_WORKING_DIRECTORY 1 +#endif + +static int diff_detect_rename_default; +static int diff_indent_heuristic = 1; +static int diff_rename_limit_default = 1000; +static int diff_suppress_blank_empty; +static int diff_use_color_default = -1; +static int diff_color_moved_default; +static int diff_color_moved_ws_default; +static int diff_context_default = 3; +static int diff_interhunk_context_default; +static const char *diff_word_regex_cfg; +static const char *external_diff_cmd_cfg; +static const char *diff_order_file_cfg; +int diff_auto_refresh_index = 1; +static int diff_mnemonic_prefix; +static int diff_no_prefix; +static int diff_relative; +static int diff_stat_name_width; +static int diff_stat_graph_width; +static int diff_dirstat_permille_default = 30; +static struct diff_options default_diff_options; +static long diff_algorithm; +static unsigned ws_error_highlight_default = WSEH_NEW; + +static char diff_colors[][COLOR_MAXLEN] = { + GIT_COLOR_RESET, + GIT_COLOR_NORMAL, /* CONTEXT */ + GIT_COLOR_BOLD, /* METAINFO */ + GIT_COLOR_CYAN, /* FRAGINFO */ + GIT_COLOR_RED, /* OLD */ + GIT_COLOR_GREEN, /* NEW */ + GIT_COLOR_YELLOW, /* COMMIT */ + GIT_COLOR_BG_RED, /* WHITESPACE */ + GIT_COLOR_NORMAL, /* FUNCINFO */ + GIT_COLOR_BOLD_MAGENTA, /* OLD_MOVED */ + GIT_COLOR_BOLD_BLUE, /* OLD_MOVED ALTERNATIVE */ + GIT_COLOR_FAINT, /* OLD_MOVED_DIM */ + GIT_COLOR_FAINT_ITALIC, /* OLD_MOVED_ALTERNATIVE_DIM */ + GIT_COLOR_BOLD_CYAN, /* NEW_MOVED */ + GIT_COLOR_BOLD_YELLOW, /* NEW_MOVED ALTERNATIVE */ + GIT_COLOR_FAINT, /* NEW_MOVED_DIM */ + GIT_COLOR_FAINT_ITALIC, /* NEW_MOVED_ALTERNATIVE_DIM */ + GIT_COLOR_FAINT, /* CONTEXT_DIM */ + GIT_COLOR_FAINT_RED, /* OLD_DIM */ + GIT_COLOR_FAINT_GREEN, /* NEW_DIM */ + GIT_COLOR_BOLD, /* CONTEXT_BOLD */ + GIT_COLOR_BOLD_RED, /* OLD_BOLD */ + GIT_COLOR_BOLD_GREEN, /* NEW_BOLD */ +}; + +static const char *color_diff_slots[] = { + [DIFF_CONTEXT] = "context", + [DIFF_METAINFO] = "meta", + [DIFF_FRAGINFO] = "frag", + [DIFF_FILE_OLD] = "old", + [DIFF_FILE_NEW] = "new", + [DIFF_COMMIT] = "commit", + [DIFF_WHITESPACE] = "whitespace", + [DIFF_FUNCINFO] = "func", + [DIFF_FILE_OLD_MOVED] = "oldMoved", + [DIFF_FILE_OLD_MOVED_ALT] = "oldMovedAlternative", + [DIFF_FILE_OLD_MOVED_DIM] = "oldMovedDimmed", + [DIFF_FILE_OLD_MOVED_ALT_DIM] = "oldMovedAlternativeDimmed", + [DIFF_FILE_NEW_MOVED] = "newMoved", + [DIFF_FILE_NEW_MOVED_ALT] = "newMovedAlternative", + [DIFF_FILE_NEW_MOVED_DIM] = "newMovedDimmed", + [DIFF_FILE_NEW_MOVED_ALT_DIM] = "newMovedAlternativeDimmed", + [DIFF_CONTEXT_DIM] = "contextDimmed", + [DIFF_FILE_OLD_DIM] = "oldDimmed", + [DIFF_FILE_NEW_DIM] = "newDimmed", + [DIFF_CONTEXT_BOLD] = "contextBold", + [DIFF_FILE_OLD_BOLD] = "oldBold", + [DIFF_FILE_NEW_BOLD] = "newBold", +}; + +define_list_config_array_extra(color_diff_slots, {"plain"}); + +static int parse_diff_color_slot(const char *var) +{ + if (!strcasecmp(var, "plain")) + return DIFF_CONTEXT; + return LOOKUP_CONFIG(color_diff_slots, var); +} + +static int parse_dirstat_params(struct diff_options *options, const char *params_string, + struct strbuf *errmsg) +{ + char *params_copy = xstrdup(params_string); + struct string_list params = STRING_LIST_INIT_NODUP; + int ret = 0; + int i; + + if (*params_copy) + string_list_split_in_place(¶ms, params_copy, ",", -1); + for (i = 0; i < params.nr; i++) { + const char *p = params.items[i].string; + if (!strcmp(p, "changes")) { + options->flags.dirstat_by_line = 0; + options->flags.dirstat_by_file = 0; + } else if (!strcmp(p, "lines")) { + options->flags.dirstat_by_line = 1; + options->flags.dirstat_by_file = 0; + } else if (!strcmp(p, "files")) { + options->flags.dirstat_by_line = 0; + options->flags.dirstat_by_file = 1; + } else if (!strcmp(p, "noncumulative")) { + options->flags.dirstat_cumulative = 0; + } else if (!strcmp(p, "cumulative")) { + options->flags.dirstat_cumulative = 1; + } else if (isdigit(*p)) { + char *end; + int permille = strtoul(p, &end, 10) * 10; + if (*end == '.' && isdigit(*++end)) { + /* only use first digit */ + permille += *end - '0'; + /* .. and ignore any further digits */ + while (isdigit(*++end)) + ; /* nothing */ + } + if (!*end) + options->dirstat_permille = permille; + else { + strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%s'\n"), + p); + ret++; + } + } else { + strbuf_addf(errmsg, _(" Unknown dirstat parameter '%s'\n"), p); + ret++; + } + + } + string_list_clear(¶ms, 0); + free(params_copy); + return ret; +} + +static int parse_submodule_params(struct diff_options *options, const char *value) +{ + if (!strcmp(value, "log")) + options->submodule_format = DIFF_SUBMODULE_LOG; + else if (!strcmp(value, "short")) + options->submodule_format = DIFF_SUBMODULE_SHORT; + else if (!strcmp(value, "diff")) + options->submodule_format = DIFF_SUBMODULE_INLINE_DIFF; + /* + * Please update $__git_diff_submodule_formats in + * git-completion.bash when you add new formats. + */ + else + return -1; + return 0; +} + +int git_config_rename(const char *var, const char *value) +{ + if (!value) + return DIFF_DETECT_RENAME; + if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy")) + return DIFF_DETECT_COPY; + return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0; +} + +long parse_algorithm_value(const char *value) +{ + if (!value) + return -1; + else if (!strcasecmp(value, "myers") || !strcasecmp(value, "default")) + return 0; + else if (!strcasecmp(value, "minimal")) + return XDF_NEED_MINIMAL; + else if (!strcasecmp(value, "patience")) + return XDF_PATIENCE_DIFF; + else if (!strcasecmp(value, "histogram")) + return XDF_HISTOGRAM_DIFF; + /* + * Please update $__git_diff_algorithms in git-completion.bash + * when you add new algorithms. + */ + return -1; +} + +static int parse_one_token(const char **arg, const char *token) +{ + const char *rest; + if (skip_prefix(*arg, token, &rest) && (!*rest || *rest == ',')) { + *arg = rest; + return 1; + } + return 0; +} + +static int parse_ws_error_highlight(const char *arg) +{ + const char *orig_arg = arg; + unsigned val = 0; + + while (*arg) { + if (parse_one_token(&arg, "none")) + val = 0; + else if (parse_one_token(&arg, "default")) + val = WSEH_NEW; + else if (parse_one_token(&arg, "all")) + val = WSEH_NEW | WSEH_OLD | WSEH_CONTEXT; + else if (parse_one_token(&arg, "new")) + val |= WSEH_NEW; + else if (parse_one_token(&arg, "old")) + val |= WSEH_OLD; + else if (parse_one_token(&arg, "context")) + val |= WSEH_CONTEXT; + else { + return -1 - (int)(arg - orig_arg); + } + if (*arg) + arg++; + } + return val; +} + +/* + * These are to give UI layer defaults. + * The core-level commands such as git-diff-files should + * never be affected by the setting of diff.renames + * the user happens to have in the configuration file. + */ +void init_diff_ui_defaults(void) +{ + diff_detect_rename_default = DIFF_DETECT_RENAME; +} + +int git_diff_heuristic_config(const char *var, const char *value, + void *cb UNUSED) +{ + if (!strcmp(var, "diff.indentheuristic")) + diff_indent_heuristic = git_config_bool(var, value); + return 0; +} + +static int parse_color_moved(const char *arg) +{ + switch (git_parse_maybe_bool(arg)) { + case 0: + return COLOR_MOVED_NO; + case 1: + return COLOR_MOVED_DEFAULT; + default: + break; + } + + if (!strcmp(arg, "no")) + return COLOR_MOVED_NO; + else if (!strcmp(arg, "plain")) + return COLOR_MOVED_PLAIN; + else if (!strcmp(arg, "blocks")) + return COLOR_MOVED_BLOCKS; + else if (!strcmp(arg, "zebra")) + return COLOR_MOVED_ZEBRA; + else if (!strcmp(arg, "default")) + return COLOR_MOVED_DEFAULT; + else if (!strcmp(arg, "dimmed-zebra")) + return COLOR_MOVED_ZEBRA_DIM; + else if (!strcmp(arg, "dimmed_zebra")) + return COLOR_MOVED_ZEBRA_DIM; + else + return error(_("color moved setting must be one of 'no', 'default', 'blocks', 'zebra', 'dimmed-zebra', 'plain'")); +} + +static unsigned parse_color_moved_ws(const char *arg) +{ + int ret = 0; + struct string_list l = STRING_LIST_INIT_DUP; + struct string_list_item *i; + + string_list_split(&l, arg, ',', -1); + + for_each_string_list_item(i, &l) { + struct strbuf sb = STRBUF_INIT; + strbuf_addstr(&sb, i->string); + strbuf_trim(&sb); + + if (!strcmp(sb.buf, "no")) + ret = 0; + else if (!strcmp(sb.buf, "ignore-space-change")) + ret |= XDF_IGNORE_WHITESPACE_CHANGE; + else if (!strcmp(sb.buf, "ignore-space-at-eol")) + ret |= XDF_IGNORE_WHITESPACE_AT_EOL; + else if (!strcmp(sb.buf, "ignore-all-space")) + ret |= XDF_IGNORE_WHITESPACE; + else if (!strcmp(sb.buf, "allow-indentation-change")) + ret |= COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE; + else { + ret |= COLOR_MOVED_WS_ERROR; + error(_("unknown color-moved-ws mode '%s', possible values are 'ignore-space-change', 'ignore-space-at-eol', 'ignore-all-space', 'allow-indentation-change'"), sb.buf); + } + + strbuf_release(&sb); + } + + if ((ret & COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE) && + (ret & XDF_WHITESPACE_FLAGS)) { + error(_("color-moved-ws: allow-indentation-change cannot be combined with other whitespace modes")); + ret |= COLOR_MOVED_WS_ERROR; + } + + string_list_clear(&l, 0); + + return ret; +} + +int git_diff_ui_config(const char *var, const char *value, + const struct config_context *ctx, void *cb) +{ + if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) { + diff_use_color_default = git_config_colorbool(var, value); + return 0; + } + if (!strcmp(var, "diff.colormoved")) { + int cm = parse_color_moved(value); + if (cm < 0) + return -1; + diff_color_moved_default = cm; + return 0; + } + if (!strcmp(var, "diff.colormovedws")) { + unsigned cm = parse_color_moved_ws(value); + if (cm & COLOR_MOVED_WS_ERROR) + return -1; + diff_color_moved_ws_default = cm; + return 0; + } + if (!strcmp(var, "diff.context")) { + diff_context_default = git_config_int(var, value, ctx->kvi); + if (diff_context_default < 0) + return -1; + return 0; + } + if (!strcmp(var, "diff.interhunkcontext")) { + diff_interhunk_context_default = git_config_int(var, value, + ctx->kvi); + if (diff_interhunk_context_default < 0) + return -1; + return 0; + } + if (!strcmp(var, "diff.renames")) { + diff_detect_rename_default = git_config_rename(var, value); + return 0; + } + if (!strcmp(var, "diff.autorefreshindex")) { + diff_auto_refresh_index = git_config_bool(var, value); + return 0; + } + if (!strcmp(var, "diff.mnemonicprefix")) { + diff_mnemonic_prefix = git_config_bool(var, value); + return 0; + } + if (!strcmp(var, "diff.noprefix")) { + diff_no_prefix = git_config_bool(var, value); + return 0; + } + if (!strcmp(var, "diff.relative")) { + diff_relative = git_config_bool(var, value); + return 0; + } + if (!strcmp(var, "diff.statnamewidth")) { + diff_stat_name_width = git_config_int(var, value, ctx->kvi); + return 0; + } + if (!strcmp(var, "diff.statgraphwidth")) { + diff_stat_graph_width = git_config_int(var, value, ctx->kvi); + return 0; + } + if (!strcmp(var, "diff.external")) + return git_config_string(&external_diff_cmd_cfg, var, value); + if (!strcmp(var, "diff.wordregex")) + return git_config_string(&diff_word_regex_cfg, var, value); + if (!strcmp(var, "diff.orderfile")) + return git_config_pathname(&diff_order_file_cfg, var, value); + + if (!strcmp(var, "diff.ignoresubmodules")) + handle_ignore_submodules_arg(&default_diff_options, value); + + if (!strcmp(var, "diff.submodule")) { + if (parse_submodule_params(&default_diff_options, value)) + warning(_("Unknown value for 'diff.submodule' config variable: '%s'"), + value); + return 0; + } + + if (!strcmp(var, "diff.algorithm")) { + diff_algorithm = parse_algorithm_value(value); + if (diff_algorithm < 0) + return -1; + return 0; + } + + if (git_color_config(var, value, cb) < 0) + return -1; + + return git_diff_basic_config(var, value, ctx, cb); +} + +int git_diff_basic_config(const char *var, const char *value, + const struct config_context *ctx, void *cb) +{ + const char *name; + + if (!strcmp(var, "diff.renamelimit")) { + diff_rename_limit_default = git_config_int(var, value, ctx->kvi); + return 0; + } + + if (userdiff_config(var, value) < 0) + return -1; + + if (skip_prefix(var, "diff.color.", &name) || + skip_prefix(var, "color.diff.", &name)) { + int slot = parse_diff_color_slot(name); + if (slot < 0) + return 0; + if (!value) + return config_error_nonbool(var); + return color_parse(value, diff_colors[slot]); + } + + if (!strcmp(var, "diff.wserrorhighlight")) { + int val = parse_ws_error_highlight(value); + if (val < 0) + return -1; + ws_error_highlight_default = val; + return 0; + } + + /* like GNU diff's --suppress-blank-empty option */ + if (!strcmp(var, "diff.suppressblankempty") || + /* for backwards compatibility */ + !strcmp(var, "diff.suppress-blank-empty")) { + diff_suppress_blank_empty = git_config_bool(var, value); + return 0; + } + + if (!strcmp(var, "diff.dirstat")) { + struct strbuf errmsg = STRBUF_INIT; + default_diff_options.dirstat_permille = diff_dirstat_permille_default; + if (parse_dirstat_params(&default_diff_options, value, &errmsg)) + warning(_("Found errors in 'diff.dirstat' config variable:\n%s"), + errmsg.buf); + strbuf_release(&errmsg); + diff_dirstat_permille_default = default_diff_options.dirstat_permille; + return 0; + } + + if (git_diff_heuristic_config(var, value, cb) < 0) + return -1; + + return git_default_config(var, value, ctx, cb); +} + +static char *quote_two(const char *one, const char *two) +{ + int need_one = quote_c_style(one, NULL, NULL, CQUOTE_NODQ); + int need_two = quote_c_style(two, NULL, NULL, CQUOTE_NODQ); + struct strbuf res = STRBUF_INIT; + + if (need_one + need_two) { + strbuf_addch(&res, '"'); + quote_c_style(one, &res, NULL, CQUOTE_NODQ); + quote_c_style(two, &res, NULL, CQUOTE_NODQ); + strbuf_addch(&res, '"'); + } else { + strbuf_addstr(&res, one); + strbuf_addstr(&res, two); + } + return strbuf_detach(&res, NULL); +} + +static const char *external_diff(void) +{ + static const char *external_diff_cmd = NULL; + static int done_preparing = 0; + + if (done_preparing) + return external_diff_cmd; + external_diff_cmd = xstrdup_or_null(getenv("GIT_EXTERNAL_DIFF")); + if (!external_diff_cmd) + external_diff_cmd = external_diff_cmd_cfg; + done_preparing = 1; + return external_diff_cmd; +} + +/* + * Keep track of files used for diffing. Sometimes such an entry + * refers to a temporary file, sometimes to an existing file, and + * sometimes to "/dev/null". + */ +static struct diff_tempfile { + /* + * filename external diff should read from, or NULL if this + * entry is currently not in use: + */ + const char *name; + + char hex[GIT_MAX_HEXSZ + 1]; + char mode[10]; + + /* + * If this diff_tempfile instance refers to a temporary file, + * this tempfile object is used to manage its lifetime. + */ + struct tempfile *tempfile; +} diff_temp[2]; + +struct emit_callback { + int color_diff; + unsigned ws_rule; + int blank_at_eof_in_preimage; + int blank_at_eof_in_postimage; + int lno_in_preimage; + int lno_in_postimage; + const char **label_path; + struct diff_words_data *diff_words; + struct diff_options *opt; + struct strbuf *header; +}; + +static int count_lines(const char *data, int size) +{ + int count, ch, completely_empty = 1, nl_just_seen = 0; + count = 0; + while (0 < size--) { + ch = *data++; + if (ch == '\n') { + count++; + nl_just_seen = 1; + completely_empty = 0; + } + else { + nl_just_seen = 0; + completely_empty = 0; + } + } + if (completely_empty) + return 0; + if (!nl_just_seen) + count++; /* no trailing newline */ + return count; +} + +static int fill_mmfile(struct repository *r, mmfile_t *mf, + struct diff_filespec *one) +{ + if (!DIFF_FILE_VALID(one)) { + mf->ptr = (char *)""; /* does not matter */ + mf->size = 0; + return 0; + } + else if (diff_populate_filespec(r, one, NULL)) + return -1; + + mf->ptr = one->data; + mf->size = one->size; + return 0; +} + +/* like fill_mmfile, but only for size, so we can avoid retrieving blob */ +static unsigned long diff_filespec_size(struct repository *r, + struct diff_filespec *one) +{ + struct diff_populate_filespec_options dpf_options = { + .check_size_only = 1, + }; + + if (!DIFF_FILE_VALID(one)) + return 0; + diff_populate_filespec(r, one, &dpf_options); + return one->size; +} + +static int count_trailing_blank(mmfile_t *mf) +{ + char *ptr = mf->ptr; + long size = mf->size; + int cnt = 0; + + if (!size) + return cnt; + ptr += size - 1; /* pointing at the very end */ + if (*ptr != '\n') + ; /* incomplete line */ + else + ptr--; /* skip the last LF */ + while (mf->ptr < ptr) { + char *prev_eol; + for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--) + if (*prev_eol == '\n') + break; + if (!ws_blank_line(prev_eol + 1, ptr - prev_eol)) + break; + cnt++; + ptr = prev_eol - 1; + } + return cnt; +} + +static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2, + struct emit_callback *ecbdata) +{ + int l1, l2, at; + l1 = count_trailing_blank(mf1); + l2 = count_trailing_blank(mf2); + if (l2 <= l1) { + ecbdata->blank_at_eof_in_preimage = 0; + ecbdata->blank_at_eof_in_postimage = 0; + return; + } + at = count_lines(mf1->ptr, mf1->size); + ecbdata->blank_at_eof_in_preimage = (at - l1) + 1; + + at = count_lines(mf2->ptr, mf2->size); + ecbdata->blank_at_eof_in_postimage = (at - l2) + 1; +} + +static void emit_line_0(struct diff_options *o, + const char *set_sign, const char *set, unsigned reverse, const char *reset, + int first, const char *line, int len) +{ + int has_trailing_newline, has_trailing_carriage_return; + int needs_reset = 0; /* at the end of the line */ + FILE *file = o->file; + + fputs(diff_line_prefix(o), file); + + has_trailing_newline = (len > 0 && line[len-1] == '\n'); + if (has_trailing_newline) + len--; + + has_trailing_carriage_return = (len > 0 && line[len-1] == '\r'); + if (has_trailing_carriage_return) + len--; + + if (!len && !first) + goto end_of_line; + + if (reverse && want_color(o->use_color)) { + fputs(GIT_COLOR_REVERSE, file); + needs_reset = 1; + } + + if (set_sign) { + fputs(set_sign, file); + needs_reset = 1; + } + + if (first) + fputc(first, file); + + if (!len) + goto end_of_line; + + if (set) { + if (set_sign && set != set_sign) + fputs(reset, file); + fputs(set, file); + needs_reset = 1; + } + fwrite(line, len, 1, file); + needs_reset = 1; /* 'line' may contain color codes. */ + +end_of_line: + if (needs_reset) + fputs(reset, file); + if (has_trailing_carriage_return) + fputc('\r', file); + if (has_trailing_newline) + fputc('\n', file); +} + +static void emit_line(struct diff_options *o, const char *set, const char *reset, + const char *line, int len) +{ + emit_line_0(o, set, NULL, 0, reset, 0, line, len); +} + +enum diff_symbol { + DIFF_SYMBOL_BINARY_DIFF_HEADER, + DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA, + DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL, + DIFF_SYMBOL_BINARY_DIFF_BODY, + DIFF_SYMBOL_BINARY_DIFF_FOOTER, + DIFF_SYMBOL_STATS_SUMMARY_NO_FILES, + DIFF_SYMBOL_STATS_SUMMARY_ABBREV, + DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES, + DIFF_SYMBOL_STATS_LINE, + DIFF_SYMBOL_WORD_DIFF, + DIFF_SYMBOL_STAT_SEP, + DIFF_SYMBOL_SUMMARY, + DIFF_SYMBOL_SUBMODULE_ADD, + DIFF_SYMBOL_SUBMODULE_DEL, + DIFF_SYMBOL_SUBMODULE_UNTRACKED, + DIFF_SYMBOL_SUBMODULE_MODIFIED, + DIFF_SYMBOL_SUBMODULE_HEADER, + DIFF_SYMBOL_SUBMODULE_ERROR, + DIFF_SYMBOL_SUBMODULE_PIPETHROUGH, + DIFF_SYMBOL_REWRITE_DIFF, + DIFF_SYMBOL_BINARY_FILES, + DIFF_SYMBOL_HEADER, + DIFF_SYMBOL_FILEPAIR_PLUS, + DIFF_SYMBOL_FILEPAIR_MINUS, + DIFF_SYMBOL_WORDS_PORCELAIN, + DIFF_SYMBOL_WORDS, + DIFF_SYMBOL_CONTEXT, + DIFF_SYMBOL_CONTEXT_INCOMPLETE, + DIFF_SYMBOL_PLUS, + DIFF_SYMBOL_MINUS, + DIFF_SYMBOL_NO_LF_EOF, + DIFF_SYMBOL_CONTEXT_FRAGINFO, + DIFF_SYMBOL_CONTEXT_MARKER, + DIFF_SYMBOL_SEPARATOR +}; +/* + * Flags for content lines: + * 0..12 are whitespace rules + * 13-15 are WSEH_NEW | WSEH_OLD | WSEH_CONTEXT + * 16 is marking if the line is blank at EOF + */ +#define DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF (1<<16) +#define DIFF_SYMBOL_MOVED_LINE (1<<17) +#define DIFF_SYMBOL_MOVED_LINE_ALT (1<<18) +#define DIFF_SYMBOL_MOVED_LINE_UNINTERESTING (1<<19) +#define DIFF_SYMBOL_CONTENT_WS_MASK (WSEH_NEW | WSEH_OLD | WSEH_CONTEXT | WS_RULE_MASK) + +/* + * This struct is used when we need to buffer the output of the diff output. + * + * NEEDSWORK: Instead of storing a copy of the line, add an offset pointer + * into the pre/post image file. This pointer could be a union with the + * line pointer. By storing an offset into the file instead of the literal line, + * we can decrease the memory footprint for the buffered output. At first we + * may want to only have indirection for the content lines, but we could also + * enhance the state for emitting prefabricated lines, e.g. the similarity + * score line or hunk/file headers would only need to store a number or path + * and then the output can be constructed later on depending on state. + */ +struct emitted_diff_symbol { + const char *line; + int len; + int flags; + int indent_off; /* Offset to first non-whitespace character */ + int indent_width; /* The visual width of the indentation */ + unsigned id; + enum diff_symbol s; +}; +#define EMITTED_DIFF_SYMBOL_INIT { 0 } + +struct emitted_diff_symbols { + struct emitted_diff_symbol *buf; + int nr, alloc; +}; +#define EMITTED_DIFF_SYMBOLS_INIT { 0 } + +static void append_emitted_diff_symbol(struct diff_options *o, + struct emitted_diff_symbol *e) +{ + struct emitted_diff_symbol *f; + + ALLOC_GROW(o->emitted_symbols->buf, + o->emitted_symbols->nr + 1, + o->emitted_symbols->alloc); + f = &o->emitted_symbols->buf[o->emitted_symbols->nr++]; + + memcpy(f, e, sizeof(struct emitted_diff_symbol)); + f->line = e->line ? xmemdupz(e->line, e->len) : NULL; +} + +static void free_emitted_diff_symbols(struct emitted_diff_symbols *e) +{ + if (!e) + return; + free(e->buf); + free(e); +} + +struct moved_entry { + const struct emitted_diff_symbol *es; + struct moved_entry *next_line; + struct moved_entry *next_match; +}; + +struct moved_block { + struct moved_entry *match; + int wsd; /* The whitespace delta of this block */ +}; + +#define INDENT_BLANKLINE INT_MIN + +static void fill_es_indent_data(struct emitted_diff_symbol *es) +{ + unsigned int off = 0, i; + int width = 0, tab_width = es->flags & WS_TAB_WIDTH_MASK; + const char *s = es->line; + const int len = es->len; + + /* skip any \v \f \r at start of indentation */ + while (s[off] == '\f' || s[off] == '\v' || + (s[off] == '\r' && off < len - 1)) + off++; + + /* calculate the visual width of indentation */ + while(1) { + if (s[off] == ' ') { + width++; + off++; + } else if (s[off] == '\t') { + width += tab_width - (width % tab_width); + while (s[++off] == '\t') + width += tab_width; + } else { + break; + } + } + + /* check if this line is blank */ + for (i = off; i < len; i++) + if (!isspace(s[i])) + break; + + if (i == len) { + es->indent_width = INDENT_BLANKLINE; + es->indent_off = len; + } else { + es->indent_off = off; + es->indent_width = width; + } +} + +static int compute_ws_delta(const struct emitted_diff_symbol *a, + const struct emitted_diff_symbol *b) +{ + int a_width = a->indent_width, + b_width = b->indent_width; + + if (a_width == INDENT_BLANKLINE && b_width == INDENT_BLANKLINE) + return INDENT_BLANKLINE; + + return a_width - b_width; +} + +static int cmp_in_block_with_wsd(const struct moved_entry *cur, + const struct emitted_diff_symbol *l, + struct moved_block *pmb) +{ + int a_width = cur->es->indent_width, b_width = l->indent_width; + int delta; + + /* The text of each line must match */ + if (cur->es->id != l->id) + return 1; + + /* + * If 'l' and 'cur' are both blank then we don't need to check the + * indent. We only need to check cur as we know the strings match. + * */ + if (a_width == INDENT_BLANKLINE) + return 0; + + /* + * The indent changes of the block are known and stored in pmb->wsd; + * however we need to check if the indent changes of the current line + * match those of the current block. + */ + delta = b_width - a_width; + + /* + * If the previous lines of this block were all blank then set its + * whitespace delta. + */ + if (pmb->wsd == INDENT_BLANKLINE) + pmb->wsd = delta; + + return delta != pmb->wsd; +} + +struct interned_diff_symbol { + struct hashmap_entry ent; + struct emitted_diff_symbol *es; +}; + +static int interned_diff_symbol_cmp(const void *hashmap_cmp_fn_data, + const struct hashmap_entry *eptr, + const struct hashmap_entry *entry_or_key, + const void *keydata UNUSED) +{ + const struct diff_options *diffopt = hashmap_cmp_fn_data; + const struct emitted_diff_symbol *a, *b; + unsigned flags = diffopt->color_moved_ws_handling + & XDF_WHITESPACE_FLAGS; + + a = container_of(eptr, const struct interned_diff_symbol, ent)->es; + b = container_of(entry_or_key, const struct interned_diff_symbol, ent)->es; + + return !xdiff_compare_lines(a->line + a->indent_off, + a->len - a->indent_off, + b->line + b->indent_off, + b->len - b->indent_off, flags); +} + +static void prepare_entry(struct diff_options *o, struct emitted_diff_symbol *l, + struct interned_diff_symbol *s) +{ + unsigned flags = o->color_moved_ws_handling & XDF_WHITESPACE_FLAGS; + unsigned int hash = xdiff_hash_string(l->line + l->indent_off, + l->len - l->indent_off, flags); + + hashmap_entry_init(&s->ent, hash); + s->es = l; +} + +struct moved_entry_list { + struct moved_entry *add, *del; +}; + +static struct moved_entry_list *add_lines_to_move_detection(struct diff_options *o, + struct mem_pool *entry_mem_pool) +{ + struct moved_entry *prev_line = NULL; + struct mem_pool interned_pool; + struct hashmap interned_map; + struct moved_entry_list *entry_list = NULL; + size_t entry_list_alloc = 0; + unsigned id = 0; + int n; + + hashmap_init(&interned_map, interned_diff_symbol_cmp, o, 8096); + mem_pool_init(&interned_pool, 1024 * 1024); + + for (n = 0; n < o->emitted_symbols->nr; n++) { + struct interned_diff_symbol key; + struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n]; + struct interned_diff_symbol *s; + struct moved_entry *entry; + + if (l->s != DIFF_SYMBOL_PLUS && l->s != DIFF_SYMBOL_MINUS) { + prev_line = NULL; + continue; + } + + if (o->color_moved_ws_handling & + COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE) + fill_es_indent_data(l); + + prepare_entry(o, l, &key); + s = hashmap_get_entry(&interned_map, &key, ent, &key.ent); + if (s) { + l->id = s->es->id; + } else { + l->id = id; + ALLOC_GROW_BY(entry_list, id, 1, entry_list_alloc); + hashmap_add(&interned_map, + memcpy(mem_pool_alloc(&interned_pool, + sizeof(key)), + &key, sizeof(key))); + } + entry = mem_pool_alloc(entry_mem_pool, sizeof(*entry)); + entry->es = l; + entry->next_line = NULL; + if (prev_line && prev_line->es->s == l->s) + prev_line->next_line = entry; + prev_line = entry; + if (l->s == DIFF_SYMBOL_PLUS) { + entry->next_match = entry_list[l->id].add; + entry_list[l->id].add = entry; + } else { + entry->next_match = entry_list[l->id].del; + entry_list[l->id].del = entry; + } + } + + hashmap_clear(&interned_map); + mem_pool_discard(&interned_pool, 0); + + return entry_list; +} + +static void pmb_advance_or_null(struct diff_options *o, + struct emitted_diff_symbol *l, + struct moved_block *pmb, + int *pmb_nr) +{ + int i, j; + + for (i = 0, j = 0; i < *pmb_nr; i++) { + int match; + struct moved_entry *prev = pmb[i].match; + struct moved_entry *cur = (prev && prev->next_line) ? + prev->next_line : NULL; + + if (o->color_moved_ws_handling & + COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE) + match = cur && + !cmp_in_block_with_wsd(cur, l, &pmb[i]); + else + match = cur && cur->es->id == l->id; + + if (match) { + pmb[j] = pmb[i]; + pmb[j++].match = cur; + } + } + *pmb_nr = j; +} + +static void fill_potential_moved_blocks(struct diff_options *o, + struct moved_entry *match, + struct emitted_diff_symbol *l, + struct moved_block **pmb_p, + int *pmb_alloc_p, int *pmb_nr_p) + +{ + struct moved_block *pmb = *pmb_p; + int pmb_alloc = *pmb_alloc_p, pmb_nr = *pmb_nr_p; + + /* + * The current line is the start of a new block. + * Setup the set of potential blocks. + */ + for (; match; match = match->next_match) { + ALLOC_GROW(pmb, pmb_nr + 1, pmb_alloc); + if (o->color_moved_ws_handling & + COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE) + pmb[pmb_nr].wsd = compute_ws_delta(l, match->es); + else + pmb[pmb_nr].wsd = 0; + pmb[pmb_nr++].match = match; + } + + *pmb_p = pmb; + *pmb_alloc_p = pmb_alloc; + *pmb_nr_p = pmb_nr; +} + +/* + * If o->color_moved is COLOR_MOVED_PLAIN, this function does nothing. + * + * Otherwise, if the last block has fewer alphanumeric characters than + * COLOR_MOVED_MIN_ALNUM_COUNT, unset DIFF_SYMBOL_MOVED_LINE on all lines in + * that block. + * + * The last block consists of the (n - block_length)'th line up to but not + * including the nth line. + * + * Returns 0 if the last block is empty or is unset by this function, non zero + * otherwise. + * + * NEEDSWORK: This uses the same heuristic as blame_entry_score() in blame.c. + * Think of a way to unify them. + */ +#define DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK \ + (DIFF_SYMBOL_MOVED_LINE | DIFF_SYMBOL_MOVED_LINE_ALT) +static int adjust_last_block(struct diff_options *o, int n, int block_length) +{ + int i, alnum_count = 0; + if (o->color_moved == COLOR_MOVED_PLAIN) + return block_length; + for (i = 1; i < block_length + 1; i++) { + const char *c = o->emitted_symbols->buf[n - i].line; + for (; *c; c++) { + if (!isalnum(*c)) + continue; + alnum_count++; + if (alnum_count >= COLOR_MOVED_MIN_ALNUM_COUNT) + return 1; + } + } + for (i = 1; i < block_length + 1; i++) + o->emitted_symbols->buf[n - i].flags &= ~DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK; + return 0; +} + +/* Find blocks of moved code, delegate actual coloring decision to helper */ +static void mark_color_as_moved(struct diff_options *o, + struct moved_entry_list *entry_list) +{ + struct moved_block *pmb = NULL; /* potentially moved blocks */ + int pmb_nr = 0, pmb_alloc = 0; + int n, flipped_block = 0, block_length = 0; + enum diff_symbol moved_symbol = DIFF_SYMBOL_BINARY_DIFF_HEADER; + + + for (n = 0; n < o->emitted_symbols->nr; n++) { + struct moved_entry *match = NULL; + struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n]; + + switch (l->s) { + case DIFF_SYMBOL_PLUS: + match = entry_list[l->id].del; + break; + case DIFF_SYMBOL_MINUS: + match = entry_list[l->id].add; + break; + default: + flipped_block = 0; + } + + if (pmb_nr && (!match || l->s != moved_symbol)) { + if (!adjust_last_block(o, n, block_length) && + block_length > 1) { + /* + * Rewind in case there is another match + * starting at the second line of the block + */ + match = NULL; + n -= block_length; + } + pmb_nr = 0; + block_length = 0; + flipped_block = 0; + } + if (!match) { + moved_symbol = DIFF_SYMBOL_BINARY_DIFF_HEADER; + continue; + } + + if (o->color_moved == COLOR_MOVED_PLAIN) { + l->flags |= DIFF_SYMBOL_MOVED_LINE; + continue; + } + + pmb_advance_or_null(o, l, pmb, &pmb_nr); + + if (pmb_nr == 0) { + int contiguous = adjust_last_block(o, n, block_length); + + if (!contiguous && block_length > 1) + /* + * Rewind in case there is another match + * starting at the second line of the block + */ + n -= block_length; + else + fill_potential_moved_blocks(o, match, l, + &pmb, &pmb_alloc, + &pmb_nr); + + if (contiguous && pmb_nr && moved_symbol == l->s) + flipped_block = (flipped_block + 1) % 2; + else + flipped_block = 0; + + if (pmb_nr) + moved_symbol = l->s; + else + moved_symbol = DIFF_SYMBOL_BINARY_DIFF_HEADER; + + block_length = 0; + } + + if (pmb_nr) { + block_length++; + l->flags |= DIFF_SYMBOL_MOVED_LINE; + if (flipped_block && o->color_moved != COLOR_MOVED_BLOCKS) + l->flags |= DIFF_SYMBOL_MOVED_LINE_ALT; + } + } + adjust_last_block(o, n, block_length); + + free(pmb); +} + +static void dim_moved_lines(struct diff_options *o) +{ + int n; + for (n = 0; n < o->emitted_symbols->nr; n++) { + struct emitted_diff_symbol *prev = (n != 0) ? + &o->emitted_symbols->buf[n - 1] : NULL; + struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n]; + struct emitted_diff_symbol *next = + (n < o->emitted_symbols->nr - 1) ? + &o->emitted_symbols->buf[n + 1] : NULL; + + /* Not a plus or minus line? */ + if (l->s != DIFF_SYMBOL_PLUS && l->s != DIFF_SYMBOL_MINUS) + continue; + + /* Not a moved line? */ + if (!(l->flags & DIFF_SYMBOL_MOVED_LINE)) + continue; + + /* + * If prev or next are not a plus or minus line, + * pretend they don't exist + */ + if (prev && prev->s != DIFF_SYMBOL_PLUS && + prev->s != DIFF_SYMBOL_MINUS) + prev = NULL; + if (next && next->s != DIFF_SYMBOL_PLUS && + next->s != DIFF_SYMBOL_MINUS) + next = NULL; + + /* Inside a block? */ + if ((prev && + (prev->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK) == + (l->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK)) && + (next && + (next->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK) == + (l->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK))) { + l->flags |= DIFF_SYMBOL_MOVED_LINE_UNINTERESTING; + continue; + } + + /* Check if we are at an interesting bound: */ + if (prev && (prev->flags & DIFF_SYMBOL_MOVED_LINE) && + (prev->flags & DIFF_SYMBOL_MOVED_LINE_ALT) != + (l->flags & DIFF_SYMBOL_MOVED_LINE_ALT)) + continue; + if (next && (next->flags & DIFF_SYMBOL_MOVED_LINE) && + (next->flags & DIFF_SYMBOL_MOVED_LINE_ALT) != + (l->flags & DIFF_SYMBOL_MOVED_LINE_ALT)) + continue; + + /* + * The boundary to prev and next are not interesting, + * so this line is not interesting as a whole + */ + l->flags |= DIFF_SYMBOL_MOVED_LINE_UNINTERESTING; + } +} + +static void emit_line_ws_markup(struct diff_options *o, + const char *set_sign, const char *set, + const char *reset, + int sign_index, const char *line, int len, + unsigned ws_rule, int blank_at_eof) +{ + const char *ws = NULL; + int sign = o->output_indicators[sign_index]; + + if (o->ws_error_highlight & ws_rule) { + ws = diff_get_color_opt(o, DIFF_WHITESPACE); + if (!*ws) + ws = NULL; + } + + if (!ws && !set_sign) + emit_line_0(o, set, NULL, 0, reset, sign, line, len); + else if (!ws) { + emit_line_0(o, set_sign, set, !!set_sign, reset, sign, line, len); + } else if (blank_at_eof) + /* Blank line at EOF - paint '+' as well */ + emit_line_0(o, ws, NULL, 0, reset, sign, line, len); + else { + /* Emit just the prefix, then the rest. */ + emit_line_0(o, set_sign ? set_sign : set, NULL, !!set_sign, reset, + sign, "", 0); + ws_check_emit(line, len, ws_rule, + o->file, set, reset, ws); + } +} + +static void emit_diff_symbol_from_struct(struct diff_options *o, + struct emitted_diff_symbol *eds) +{ + static const char *nneof = " No newline at end of file\n"; + const char *context, *reset, *set, *set_sign, *meta, *fraginfo; + + enum diff_symbol s = eds->s; + const char *line = eds->line; + int len = eds->len; + unsigned flags = eds->flags; + + switch (s) { + case DIFF_SYMBOL_NO_LF_EOF: + context = diff_get_color_opt(o, DIFF_CONTEXT); + reset = diff_get_color_opt(o, DIFF_RESET); + putc('\n', o->file); + emit_line_0(o, context, NULL, 0, reset, '\\', + nneof, strlen(nneof)); + break; + case DIFF_SYMBOL_SUBMODULE_HEADER: + case DIFF_SYMBOL_SUBMODULE_ERROR: + case DIFF_SYMBOL_SUBMODULE_PIPETHROUGH: + case DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES: + case DIFF_SYMBOL_SUMMARY: + case DIFF_SYMBOL_STATS_LINE: + case DIFF_SYMBOL_BINARY_DIFF_BODY: + case DIFF_SYMBOL_CONTEXT_FRAGINFO: + emit_line(o, "", "", line, len); + break; + case DIFF_SYMBOL_CONTEXT_INCOMPLETE: + case DIFF_SYMBOL_CONTEXT_MARKER: + context = diff_get_color_opt(o, DIFF_CONTEXT); + reset = diff_get_color_opt(o, DIFF_RESET); + emit_line(o, context, reset, line, len); + break; + case DIFF_SYMBOL_SEPARATOR: + fprintf(o->file, "%s%c", + diff_line_prefix(o), + o->line_termination); + break; + case DIFF_SYMBOL_CONTEXT: + set = diff_get_color_opt(o, DIFF_CONTEXT); + reset = diff_get_color_opt(o, DIFF_RESET); + set_sign = NULL; + if (o->flags.dual_color_diffed_diffs) { + char c = !len ? 0 : line[0]; + + if (c == '+') + set = diff_get_color_opt(o, DIFF_FILE_NEW); + else if (c == '@') + set = diff_get_color_opt(o, DIFF_FRAGINFO); + else if (c == '-') + set = diff_get_color_opt(o, DIFF_FILE_OLD); + } + emit_line_ws_markup(o, set_sign, set, reset, + OUTPUT_INDICATOR_CONTEXT, line, len, + flags & (DIFF_SYMBOL_CONTENT_WS_MASK), 0); + break; + case DIFF_SYMBOL_PLUS: + switch (flags & (DIFF_SYMBOL_MOVED_LINE | + DIFF_SYMBOL_MOVED_LINE_ALT | + DIFF_SYMBOL_MOVED_LINE_UNINTERESTING)) { + case DIFF_SYMBOL_MOVED_LINE | + DIFF_SYMBOL_MOVED_LINE_ALT | + DIFF_SYMBOL_MOVED_LINE_UNINTERESTING: + set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_ALT_DIM); + break; + case DIFF_SYMBOL_MOVED_LINE | + DIFF_SYMBOL_MOVED_LINE_ALT: + set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_ALT); + break; + case DIFF_SYMBOL_MOVED_LINE | + DIFF_SYMBOL_MOVED_LINE_UNINTERESTING: + set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_DIM); + break; + case DIFF_SYMBOL_MOVED_LINE: + set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED); + break; + default: + set = diff_get_color_opt(o, DIFF_FILE_NEW); + } + reset = diff_get_color_opt(o, DIFF_RESET); + if (!o->flags.dual_color_diffed_diffs) + set_sign = NULL; + else { + char c = !len ? 0 : line[0]; + + set_sign = set; + if (c == '-') + set = diff_get_color_opt(o, DIFF_FILE_OLD_BOLD); + else if (c == '@') + set = diff_get_color_opt(o, DIFF_FRAGINFO); + else if (c == '+') + set = diff_get_color_opt(o, DIFF_FILE_NEW_BOLD); + else + set = diff_get_color_opt(o, DIFF_CONTEXT_BOLD); + flags &= ~DIFF_SYMBOL_CONTENT_WS_MASK; + } + emit_line_ws_markup(o, set_sign, set, reset, + OUTPUT_INDICATOR_NEW, line, len, + flags & DIFF_SYMBOL_CONTENT_WS_MASK, + flags & DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF); + break; + case DIFF_SYMBOL_MINUS: + switch (flags & (DIFF_SYMBOL_MOVED_LINE | + DIFF_SYMBOL_MOVED_LINE_ALT | + DIFF_SYMBOL_MOVED_LINE_UNINTERESTING)) { + case DIFF_SYMBOL_MOVED_LINE | + DIFF_SYMBOL_MOVED_LINE_ALT | + DIFF_SYMBOL_MOVED_LINE_UNINTERESTING: + set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_ALT_DIM); + break; + case DIFF_SYMBOL_MOVED_LINE | + DIFF_SYMBOL_MOVED_LINE_ALT: + set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_ALT); + break; + case DIFF_SYMBOL_MOVED_LINE | + DIFF_SYMBOL_MOVED_LINE_UNINTERESTING: + set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_DIM); + break; + case DIFF_SYMBOL_MOVED_LINE: + set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED); + break; + default: + set = diff_get_color_opt(o, DIFF_FILE_OLD); + } + reset = diff_get_color_opt(o, DIFF_RESET); + if (!o->flags.dual_color_diffed_diffs) + set_sign = NULL; + else { + char c = !len ? 0 : line[0]; + + set_sign = set; + if (c == '+') + set = diff_get_color_opt(o, DIFF_FILE_NEW_DIM); + else if (c == '@') + set = diff_get_color_opt(o, DIFF_FRAGINFO); + else if (c == '-') + set = diff_get_color_opt(o, DIFF_FILE_OLD_DIM); + else + set = diff_get_color_opt(o, DIFF_CONTEXT_DIM); + } + emit_line_ws_markup(o, set_sign, set, reset, + OUTPUT_INDICATOR_OLD, line, len, + flags & DIFF_SYMBOL_CONTENT_WS_MASK, 0); + break; + case DIFF_SYMBOL_WORDS_PORCELAIN: + context = diff_get_color_opt(o, DIFF_CONTEXT); + reset = diff_get_color_opt(o, DIFF_RESET); + emit_line(o, context, reset, line, len); + fputs("~\n", o->file); + break; + case DIFF_SYMBOL_WORDS: + context = diff_get_color_opt(o, DIFF_CONTEXT); + reset = diff_get_color_opt(o, DIFF_RESET); + /* + * Skip the prefix character, if any. With + * diff_suppress_blank_empty, there may be + * none. + */ + if (line[0] != '\n') { + line++; + len--; + } + emit_line(o, context, reset, line, len); + break; + case DIFF_SYMBOL_FILEPAIR_PLUS: + meta = diff_get_color_opt(o, DIFF_METAINFO); + reset = diff_get_color_opt(o, DIFF_RESET); + fprintf(o->file, "%s%s+++ %s%s%s\n", diff_line_prefix(o), meta, + line, reset, + strchr(line, ' ') ? "\t" : ""); + break; + case DIFF_SYMBOL_FILEPAIR_MINUS: + meta = diff_get_color_opt(o, DIFF_METAINFO); + reset = diff_get_color_opt(o, DIFF_RESET); + fprintf(o->file, "%s%s--- %s%s%s\n", diff_line_prefix(o), meta, + line, reset, + strchr(line, ' ') ? "\t" : ""); + break; + case DIFF_SYMBOL_BINARY_FILES: + case DIFF_SYMBOL_HEADER: + fprintf(o->file, "%s", line); + break; + case DIFF_SYMBOL_BINARY_DIFF_HEADER: + fprintf(o->file, "%sGIT binary patch\n", diff_line_prefix(o)); + break; + case DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA: + fprintf(o->file, "%sdelta %s\n", diff_line_prefix(o), line); + break; + case DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL: + fprintf(o->file, "%sliteral %s\n", diff_line_prefix(o), line); + break; + case DIFF_SYMBOL_BINARY_DIFF_FOOTER: + fputs(diff_line_prefix(o), o->file); + fputc('\n', o->file); + break; + case DIFF_SYMBOL_REWRITE_DIFF: + fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO); + reset = diff_get_color_opt(o, DIFF_RESET); + emit_line(o, fraginfo, reset, line, len); + break; + case DIFF_SYMBOL_SUBMODULE_ADD: + set = diff_get_color_opt(o, DIFF_FILE_NEW); + reset = diff_get_color_opt(o, DIFF_RESET); + emit_line(o, set, reset, line, len); + break; + case DIFF_SYMBOL_SUBMODULE_DEL: + set = diff_get_color_opt(o, DIFF_FILE_OLD); + reset = diff_get_color_opt(o, DIFF_RESET); + emit_line(o, set, reset, line, len); + break; + case DIFF_SYMBOL_SUBMODULE_UNTRACKED: + fprintf(o->file, "%sSubmodule %s contains untracked content\n", + diff_line_prefix(o), line); + break; + case DIFF_SYMBOL_SUBMODULE_MODIFIED: + fprintf(o->file, "%sSubmodule %s contains modified content\n", + diff_line_prefix(o), line); + break; + case DIFF_SYMBOL_STATS_SUMMARY_NO_FILES: + emit_line(o, "", "", " 0 files changed\n", + strlen(" 0 files changed\n")); + break; + case DIFF_SYMBOL_STATS_SUMMARY_ABBREV: + emit_line(o, "", "", " ...\n", strlen(" ...\n")); + break; + case DIFF_SYMBOL_WORD_DIFF: + fprintf(o->file, "%.*s", len, line); + break; + case DIFF_SYMBOL_STAT_SEP: + fputs(o->stat_sep, o->file); + break; + default: + BUG("unknown diff symbol"); + } +} + +static void emit_diff_symbol(struct diff_options *o, enum diff_symbol s, + const char *line, int len, unsigned flags) +{ + struct emitted_diff_symbol e = { + .line = line, .len = len, .flags = flags, .s = s + }; + + if (o->emitted_symbols) + append_emitted_diff_symbol(o, &e); + else + emit_diff_symbol_from_struct(o, &e); +} + +void diff_emit_submodule_del(struct diff_options *o, const char *line) +{ + emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_DEL, line, strlen(line), 0); +} + +void diff_emit_submodule_add(struct diff_options *o, const char *line) +{ + emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_ADD, line, strlen(line), 0); +} + +void diff_emit_submodule_untracked(struct diff_options *o, const char *path) +{ + emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_UNTRACKED, + path, strlen(path), 0); +} + +void diff_emit_submodule_modified(struct diff_options *o, const char *path) +{ + emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_MODIFIED, + path, strlen(path), 0); +} + +void diff_emit_submodule_header(struct diff_options *o, const char *header) +{ + emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_HEADER, + header, strlen(header), 0); +} + +void diff_emit_submodule_error(struct diff_options *o, const char *err) +{ + emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_ERROR, err, strlen(err), 0); +} + +void diff_emit_submodule_pipethrough(struct diff_options *o, + const char *line, int len) +{ + emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_PIPETHROUGH, line, len, 0); +} + +static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len) +{ + if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) && + ecbdata->blank_at_eof_in_preimage && + ecbdata->blank_at_eof_in_postimage && + ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage && + ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage)) + return 0; + return ws_blank_line(line, len); +} + +static void emit_add_line(struct emit_callback *ecbdata, + const char *line, int len) +{ + unsigned flags = WSEH_NEW | ecbdata->ws_rule; + if (new_blank_line_at_eof(ecbdata, line, len)) + flags |= DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF; + + emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_PLUS, line, len, flags); +} + +static void emit_del_line(struct emit_callback *ecbdata, + const char *line, int len) +{ + unsigned flags = WSEH_OLD | ecbdata->ws_rule; + emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_MINUS, line, len, flags); +} + +static void emit_context_line(struct emit_callback *ecbdata, + const char *line, int len) +{ + unsigned flags = WSEH_CONTEXT | ecbdata->ws_rule; + emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_CONTEXT, line, len, flags); +} + +static void emit_hunk_header(struct emit_callback *ecbdata, + const char *line, int len) +{ + const char *context = diff_get_color(ecbdata->color_diff, DIFF_CONTEXT); + const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO); + const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO); + const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET); + const char *reverse = ecbdata->color_diff ? GIT_COLOR_REVERSE : ""; + static const char atat[2] = { '@', '@' }; + const char *cp, *ep; + struct strbuf msgbuf = STRBUF_INIT; + int org_len = len; + int i = 1; + + /* + * As a hunk header must begin with "@@ -<old>, +<new> @@", + * it always is at least 10 bytes long. + */ + if (len < 10 || + memcmp(line, atat, 2) || + !(ep = memmem(line + 2, len - 2, atat, 2))) { + emit_diff_symbol(ecbdata->opt, + DIFF_SYMBOL_CONTEXT_MARKER, line, len, 0); + return; + } + ep += 2; /* skip over @@ */ + + /* The hunk header in fraginfo color */ + if (ecbdata->opt->flags.dual_color_diffed_diffs) + strbuf_addstr(&msgbuf, reverse); + strbuf_addstr(&msgbuf, frag); + if (ecbdata->opt->flags.suppress_hunk_header_line_count) + strbuf_add(&msgbuf, atat, sizeof(atat)); + else + strbuf_add(&msgbuf, line, ep - line); + strbuf_addstr(&msgbuf, reset); + + /* + * trailing "\r\n" + */ + for ( ; i < 3; i++) + if (line[len - i] == '\r' || line[len - i] == '\n') + len--; + + /* blank before the func header */ + for (cp = ep; ep - line < len; ep++) + if (*ep != ' ' && *ep != '\t') + break; + if (ep != cp) { + strbuf_addstr(&msgbuf, context); + strbuf_add(&msgbuf, cp, ep - cp); + strbuf_addstr(&msgbuf, reset); + } + + if (ep < line + len) { + strbuf_addstr(&msgbuf, func); + strbuf_add(&msgbuf, ep, line + len - ep); + strbuf_addstr(&msgbuf, reset); + } + + strbuf_add(&msgbuf, line + len, org_len - len); + strbuf_complete_line(&msgbuf); + emit_diff_symbol(ecbdata->opt, + DIFF_SYMBOL_CONTEXT_FRAGINFO, msgbuf.buf, msgbuf.len, 0); + strbuf_release(&msgbuf); +} + +static struct diff_tempfile *claim_diff_tempfile(void) +{ + int i; + for (i = 0; i < ARRAY_SIZE(diff_temp); i++) + if (!diff_temp[i].name) + return diff_temp + i; + BUG("diff is failing to clean up its tempfiles"); +} + +static void remove_tempfile(void) +{ + int i; + for (i = 0; i < ARRAY_SIZE(diff_temp); i++) { + if (is_tempfile_active(diff_temp[i].tempfile)) + delete_tempfile(&diff_temp[i].tempfile); + diff_temp[i].name = NULL; + } +} + +static void add_line_count(struct strbuf *out, int count) +{ + switch (count) { + case 0: + strbuf_addstr(out, "0,0"); + break; + case 1: + strbuf_addstr(out, "1"); + break; + default: + strbuf_addf(out, "1,%d", count); + break; + } +} + +static void emit_rewrite_lines(struct emit_callback *ecb, + int prefix, const char *data, int size) +{ + const char *endp = NULL; + + while (0 < size) { + int len; + + endp = memchr(data, '\n', size); + len = endp ? (endp - data + 1) : size; + if (prefix != '+') { + ecb->lno_in_preimage++; + emit_del_line(ecb, data, len); + } else { + ecb->lno_in_postimage++; + emit_add_line(ecb, data, len); + } + size -= len; + data += len; + } + if (!endp) + emit_diff_symbol(ecb->opt, DIFF_SYMBOL_NO_LF_EOF, NULL, 0, 0); +} + +static void emit_rewrite_diff(const char *name_a, + const char *name_b, + struct diff_filespec *one, + struct diff_filespec *two, + struct userdiff_driver *textconv_one, + struct userdiff_driver *textconv_two, + struct diff_options *o) +{ + int lc_a, lc_b; + static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT; + const char *a_prefix, *b_prefix; + char *data_one, *data_two; + size_t size_one, size_two; + struct emit_callback ecbdata; + struct strbuf out = STRBUF_INIT; + + if (diff_mnemonic_prefix && o->flags.reverse_diff) { + a_prefix = o->b_prefix; + b_prefix = o->a_prefix; + } else { + a_prefix = o->a_prefix; + b_prefix = o->b_prefix; + } + + name_a += (*name_a == '/'); + name_b += (*name_b == '/'); + + strbuf_reset(&a_name); + strbuf_reset(&b_name); + quote_two_c_style(&a_name, a_prefix, name_a, 0); + quote_two_c_style(&b_name, b_prefix, name_b, 0); + + size_one = fill_textconv(o->repo, textconv_one, one, &data_one); + size_two = fill_textconv(o->repo, textconv_two, two, &data_two); + + memset(&ecbdata, 0, sizeof(ecbdata)); + ecbdata.color_diff = want_color(o->use_color); + ecbdata.ws_rule = whitespace_rule(o->repo->index, name_b); + ecbdata.opt = o; + if (ecbdata.ws_rule & WS_BLANK_AT_EOF) { + mmfile_t mf1, mf2; + mf1.ptr = (char *)data_one; + mf2.ptr = (char *)data_two; + mf1.size = size_one; + mf2.size = size_two; + check_blank_at_eof(&mf1, &mf2, &ecbdata); + } + ecbdata.lno_in_preimage = 1; + ecbdata.lno_in_postimage = 1; + + lc_a = count_lines(data_one, size_one); + lc_b = count_lines(data_two, size_two); + + emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_MINUS, + a_name.buf, a_name.len, 0); + emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_PLUS, + b_name.buf, b_name.len, 0); + + strbuf_addstr(&out, "@@ -"); + if (!o->irreversible_delete) + add_line_count(&out, lc_a); + else + strbuf_addstr(&out, "?,?"); + strbuf_addstr(&out, " +"); + add_line_count(&out, lc_b); + strbuf_addstr(&out, " @@\n"); + emit_diff_symbol(o, DIFF_SYMBOL_REWRITE_DIFF, out.buf, out.len, 0); + strbuf_release(&out); + + if (lc_a && !o->irreversible_delete) + emit_rewrite_lines(&ecbdata, '-', data_one, size_one); + if (lc_b) + emit_rewrite_lines(&ecbdata, '+', data_two, size_two); + if (textconv_one) + free((char *)data_one); + if (textconv_two) + free((char *)data_two); +} + +struct diff_words_buffer { + mmfile_t text; + unsigned long alloc; + struct diff_words_orig { + const char *begin, *end; + } *orig; + int orig_nr, orig_alloc; +}; + +static void diff_words_append(char *line, unsigned long len, + struct diff_words_buffer *buffer) +{ + ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc); + line++; + len--; + memcpy(buffer->text.ptr + buffer->text.size, line, len); + buffer->text.size += len; + buffer->text.ptr[buffer->text.size] = '\0'; +} + +struct diff_words_style_elem { + const char *prefix; + const char *suffix; + const char *color; /* NULL; filled in by the setup code if + * color is enabled */ +}; + +struct diff_words_style { + enum diff_words_type type; + struct diff_words_style_elem new_word, old_word, ctx; + const char *newline; +}; + +static struct diff_words_style diff_words_styles[] = { + { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" }, + { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" }, + { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" } +}; + +struct diff_words_data { + struct diff_words_buffer minus, plus; + const char *current_plus; + int last_minus; + struct diff_options *opt; + regex_t *word_regex; + enum diff_words_type type; + struct diff_words_style *style; +}; + +static int fn_out_diff_words_write_helper(struct diff_options *o, + struct diff_words_style_elem *st_el, + const char *newline, + size_t count, const char *buf) +{ + int print = 0; + struct strbuf sb = STRBUF_INIT; + + while (count) { + char *p = memchr(buf, '\n', count); + if (print) + strbuf_addstr(&sb, diff_line_prefix(o)); + + if (p != buf) { + const char *reset = st_el->color && *st_el->color ? + GIT_COLOR_RESET : NULL; + if (st_el->color && *st_el->color) + strbuf_addstr(&sb, st_el->color); + strbuf_addstr(&sb, st_el->prefix); + strbuf_add(&sb, buf, p ? p - buf : count); + strbuf_addstr(&sb, st_el->suffix); + if (reset) + strbuf_addstr(&sb, reset); + } + if (!p) + goto out; + + strbuf_addstr(&sb, newline); + count -= p + 1 - buf; + buf = p + 1; + print = 1; + if (count) { + emit_diff_symbol(o, DIFF_SYMBOL_WORD_DIFF, + sb.buf, sb.len, 0); + strbuf_reset(&sb); + } + } + +out: + if (sb.len) + emit_diff_symbol(o, DIFF_SYMBOL_WORD_DIFF, + sb.buf, sb.len, 0); + strbuf_release(&sb); + return 0; +} + +/* + * '--color-words' algorithm can be described as: + * + * 1. collect the minus/plus lines of a diff hunk, divided into + * minus-lines and plus-lines; + * + * 2. break both minus-lines and plus-lines into words and + * place them into two mmfile_t with one word for each line; + * + * 3. use xdiff to run diff on the two mmfile_t to get the words level diff; + * + * And for the common parts of the both file, we output the plus side text. + * diff_words->current_plus is used to trace the current position of the plus file + * which printed. diff_words->last_minus is used to trace the last minus word + * printed. + * + * For '--graph' to work with '--color-words', we need to output the graph prefix + * on each line of color words output. Generally, there are two conditions on + * which we should output the prefix. + * + * 1. diff_words->last_minus == 0 && + * diff_words->current_plus == diff_words->plus.text.ptr + * + * that is: the plus text must start as a new line, and if there is no minus + * word printed, a graph prefix must be printed. + * + * 2. diff_words->current_plus > diff_words->plus.text.ptr && + * *(diff_words->current_plus - 1) == '\n' + * + * that is: a graph prefix must be printed following a '\n' + */ +static int color_words_output_graph_prefix(struct diff_words_data *diff_words) +{ + if ((diff_words->last_minus == 0 && + diff_words->current_plus == diff_words->plus.text.ptr) || + (diff_words->current_plus > diff_words->plus.text.ptr && + *(diff_words->current_plus - 1) == '\n')) { + return 1; + } else { + return 0; + } +} + +static void fn_out_diff_words_aux(void *priv, + long minus_first, long minus_len, + long plus_first, long plus_len, + const char *func UNUSED, long funclen UNUSED) +{ + struct diff_words_data *diff_words = priv; + struct diff_words_style *style = diff_words->style; + const char *minus_begin, *minus_end, *plus_begin, *plus_end; + struct diff_options *opt = diff_words->opt; + const char *line_prefix; + + assert(opt); + line_prefix = diff_line_prefix(opt); + + /* POSIX requires that first be decremented by one if len == 0... */ + if (minus_len) { + minus_begin = diff_words->minus.orig[minus_first].begin; + minus_end = + diff_words->minus.orig[minus_first + minus_len - 1].end; + } else + minus_begin = minus_end = + diff_words->minus.orig[minus_first].end; + + if (plus_len) { + plus_begin = diff_words->plus.orig[plus_first].begin; + plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end; + } else + plus_begin = plus_end = diff_words->plus.orig[plus_first].end; + + if (color_words_output_graph_prefix(diff_words)) { + fputs(line_prefix, diff_words->opt->file); + } + if (diff_words->current_plus != plus_begin) { + fn_out_diff_words_write_helper(diff_words->opt, + &style->ctx, style->newline, + plus_begin - diff_words->current_plus, + diff_words->current_plus); + } + if (minus_begin != minus_end) { + fn_out_diff_words_write_helper(diff_words->opt, + &style->old_word, style->newline, + minus_end - minus_begin, minus_begin); + } + if (plus_begin != plus_end) { + fn_out_diff_words_write_helper(diff_words->opt, + &style->new_word, style->newline, + plus_end - plus_begin, plus_begin); + } + + diff_words->current_plus = plus_end; + diff_words->last_minus = minus_first; +} + +/* This function starts looking at *begin, and returns 0 iff a word was found. */ +static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex, + int *begin, int *end) +{ + while (word_regex && *begin < buffer->size) { + regmatch_t match[1]; + if (!regexec_buf(word_regex, buffer->ptr + *begin, + buffer->size - *begin, 1, match, 0)) { + char *p = memchr(buffer->ptr + *begin + match[0].rm_so, + '\n', match[0].rm_eo - match[0].rm_so); + *end = p ? p - buffer->ptr : match[0].rm_eo + *begin; + *begin += match[0].rm_so; + if (*begin == *end) + (*begin)++; + else + return *begin > *end; + } else { + return -1; + } + } + + /* find the next word */ + while (*begin < buffer->size && isspace(buffer->ptr[*begin])) + (*begin)++; + if (*begin >= buffer->size) + return -1; + + /* find the end of the word */ + *end = *begin + 1; + while (*end < buffer->size && !isspace(buffer->ptr[*end])) + (*end)++; + + return 0; +} + +/* + * This function splits the words in buffer->text, stores the list with + * newline separator into out, and saves the offsets of the original words + * in buffer->orig. + */ +static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out, + regex_t *word_regex) +{ + int i, j; + long alloc = 0; + + out->size = 0; + out->ptr = NULL; + + /* fake an empty "0th" word */ + ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc); + buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr; + buffer->orig_nr = 1; + + for (i = 0; i < buffer->text.size; i++) { + if (find_word_boundaries(&buffer->text, word_regex, &i, &j)) + return; + + /* store original boundaries */ + ALLOC_GROW(buffer->orig, buffer->orig_nr + 1, + buffer->orig_alloc); + buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i; + buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j; + buffer->orig_nr++; + + /* store one word */ + ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc); + memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i); + out->ptr[out->size + j - i] = '\n'; + out->size += j - i + 1; + + i = j - 1; + } +} + +/* this executes the word diff on the accumulated buffers */ +static void diff_words_show(struct diff_words_data *diff_words) +{ + xpparam_t xpp; + xdemitconf_t xecfg; + mmfile_t minus, plus; + struct diff_words_style *style = diff_words->style; + + struct diff_options *opt = diff_words->opt; + const char *line_prefix; + + assert(opt); + line_prefix = diff_line_prefix(opt); + + /* special case: only removal */ + if (!diff_words->plus.text.size) { + emit_diff_symbol(diff_words->opt, DIFF_SYMBOL_WORD_DIFF, + line_prefix, strlen(line_prefix), 0); + fn_out_diff_words_write_helper(diff_words->opt, + &style->old_word, style->newline, + diff_words->minus.text.size, + diff_words->minus.text.ptr); + diff_words->minus.text.size = 0; + return; + } + + diff_words->current_plus = diff_words->plus.text.ptr; + diff_words->last_minus = 0; + + memset(&xpp, 0, sizeof(xpp)); + memset(&xecfg, 0, sizeof(xecfg)); + diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex); + diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex); + xpp.flags = 0; + /* as only the hunk header will be parsed, we need a 0-context */ + xecfg.ctxlen = 0; + if (xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, NULL, + diff_words, &xpp, &xecfg)) + die("unable to generate word diff"); + free(minus.ptr); + free(plus.ptr); + if (diff_words->current_plus != diff_words->plus.text.ptr + + diff_words->plus.text.size) { + if (color_words_output_graph_prefix(diff_words)) + emit_diff_symbol(diff_words->opt, DIFF_SYMBOL_WORD_DIFF, + line_prefix, strlen(line_prefix), 0); + fn_out_diff_words_write_helper(diff_words->opt, + &style->ctx, style->newline, + diff_words->plus.text.ptr + diff_words->plus.text.size + - diff_words->current_plus, diff_words->current_plus); + } + diff_words->minus.text.size = diff_words->plus.text.size = 0; +} + +/* In "color-words" mode, show word-diff of words accumulated in the buffer */ +static void diff_words_flush(struct emit_callback *ecbdata) +{ + struct diff_options *wo = ecbdata->diff_words->opt; + + if (ecbdata->diff_words->minus.text.size || + ecbdata->diff_words->plus.text.size) + diff_words_show(ecbdata->diff_words); + + if (wo->emitted_symbols) { + struct diff_options *o = ecbdata->opt; + struct emitted_diff_symbols *wol = wo->emitted_symbols; + int i; + + /* + * NEEDSWORK: + * Instead of appending each, concat all words to a line? + */ + for (i = 0; i < wol->nr; i++) + append_emitted_diff_symbol(o, &wol->buf[i]); + + for (i = 0; i < wol->nr; i++) + free((void *)wol->buf[i].line); + + wol->nr = 0; + } +} + +static void diff_filespec_load_driver(struct diff_filespec *one, + struct index_state *istate) +{ + /* Use already-loaded driver */ + if (one->driver) + return; + + if (S_ISREG(one->mode)) + one->driver = userdiff_find_by_path(istate, one->path); + + /* Fallback to default settings */ + if (!one->driver) + one->driver = userdiff_find_by_name("default"); +} + +static const char *userdiff_word_regex(struct diff_filespec *one, + struct index_state *istate) +{ + diff_filespec_load_driver(one, istate); + return one->driver->word_regex; +} + +static void init_diff_words_data(struct emit_callback *ecbdata, + struct diff_options *orig_opts, + struct diff_filespec *one, + struct diff_filespec *two) +{ + int i; + struct diff_options *o = xmalloc(sizeof(struct diff_options)); + memcpy(o, orig_opts, sizeof(struct diff_options)); + + CALLOC_ARRAY(ecbdata->diff_words, 1); + ecbdata->diff_words->type = o->word_diff; + ecbdata->diff_words->opt = o; + + if (orig_opts->emitted_symbols) + CALLOC_ARRAY(o->emitted_symbols, 1); + + if (!o->word_regex) + o->word_regex = userdiff_word_regex(one, o->repo->index); + if (!o->word_regex) + o->word_regex = userdiff_word_regex(two, o->repo->index); + if (!o->word_regex) + o->word_regex = diff_word_regex_cfg; + if (o->word_regex) { + ecbdata->diff_words->word_regex = (regex_t *) + xmalloc(sizeof(regex_t)); + if (regcomp(ecbdata->diff_words->word_regex, + o->word_regex, + REG_EXTENDED | REG_NEWLINE)) + die("invalid regular expression: %s", + o->word_regex); + } + for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) { + if (o->word_diff == diff_words_styles[i].type) { + ecbdata->diff_words->style = + &diff_words_styles[i]; + break; + } + } + if (want_color(o->use_color)) { + struct diff_words_style *st = ecbdata->diff_words->style; + st->old_word.color = diff_get_color_opt(o, DIFF_FILE_OLD); + st->new_word.color = diff_get_color_opt(o, DIFF_FILE_NEW); + st->ctx.color = diff_get_color_opt(o, DIFF_CONTEXT); + } +} + +static void free_diff_words_data(struct emit_callback *ecbdata) +{ + if (ecbdata->diff_words) { + diff_words_flush(ecbdata); + free_emitted_diff_symbols(ecbdata->diff_words->opt->emitted_symbols); + free (ecbdata->diff_words->opt); + free (ecbdata->diff_words->minus.text.ptr); + free (ecbdata->diff_words->minus.orig); + free (ecbdata->diff_words->plus.text.ptr); + free (ecbdata->diff_words->plus.orig); + if (ecbdata->diff_words->word_regex) { + regfree(ecbdata->diff_words->word_regex); + free(ecbdata->diff_words->word_regex); + } + FREE_AND_NULL(ecbdata->diff_words); + } +} + +const char *diff_get_color(int diff_use_color, enum color_diff ix) +{ + if (want_color(diff_use_color)) + return diff_colors[ix]; + return ""; +} + +const char *diff_line_prefix(struct diff_options *opt) +{ + struct strbuf *msgbuf; + if (!opt->output_prefix) + return ""; + + msgbuf = opt->output_prefix(opt, opt->output_prefix_data); + return msgbuf->buf; +} + +static unsigned long sane_truncate_line(char *line, unsigned long len) +{ + const char *cp; + unsigned long allot; + size_t l = len; + + cp = line; + allot = l; + while (0 < l) { + (void) utf8_width(&cp, &l); + if (!cp) + break; /* truncated in the middle? */ + } + return allot - l; +} + +static void find_lno(const char *line, struct emit_callback *ecbdata) +{ + const char *p; + ecbdata->lno_in_preimage = 0; + ecbdata->lno_in_postimage = 0; + p = strchr(line, '-'); + if (!p) + return; /* cannot happen */ + ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10); + p = strchr(p, '+'); + if (!p) + return; /* cannot happen */ + ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10); +} + +static int fn_out_consume(void *priv, char *line, unsigned long len) +{ + struct emit_callback *ecbdata = priv; + struct diff_options *o = ecbdata->opt; + + o->found_changes = 1; + + if (ecbdata->header) { + emit_diff_symbol(o, DIFF_SYMBOL_HEADER, + ecbdata->header->buf, ecbdata->header->len, 0); + strbuf_reset(ecbdata->header); + ecbdata->header = NULL; + } + + if (ecbdata->label_path[0]) { + emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_MINUS, + ecbdata->label_path[0], + strlen(ecbdata->label_path[0]), 0); + emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_PLUS, + ecbdata->label_path[1], + strlen(ecbdata->label_path[1]), 0); + ecbdata->label_path[0] = ecbdata->label_path[1] = NULL; + } + + if (diff_suppress_blank_empty + && len == 2 && line[0] == ' ' && line[1] == '\n') { + line[0] = '\n'; + len = 1; + } + + if (line[0] == '@') { + if (ecbdata->diff_words) + diff_words_flush(ecbdata); + len = sane_truncate_line(line, len); + find_lno(line, ecbdata); + emit_hunk_header(ecbdata, line, len); + return 0; + } + + if (ecbdata->diff_words) { + enum diff_symbol s = + ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN ? + DIFF_SYMBOL_WORDS_PORCELAIN : DIFF_SYMBOL_WORDS; + if (line[0] == '-') { + diff_words_append(line, len, + &ecbdata->diff_words->minus); + return 0; + } else if (line[0] == '+') { + diff_words_append(line, len, + &ecbdata->diff_words->plus); + return 0; + } else if (starts_with(line, "\\ ")) { + /* + * Eat the "no newline at eof" marker as if we + * saw a "+" or "-" line with nothing on it, + * and return without diff_words_flush() to + * defer processing. If this is the end of + * preimage, more "+" lines may come after it. + */ + return 0; + } + diff_words_flush(ecbdata); + emit_diff_symbol(o, s, line, len, 0); + return 0; + } + + switch (line[0]) { + case '+': + ecbdata->lno_in_postimage++; + emit_add_line(ecbdata, line + 1, len - 1); + break; + case '-': + ecbdata->lno_in_preimage++; + emit_del_line(ecbdata, line + 1, len - 1); + break; + case ' ': + ecbdata->lno_in_postimage++; + ecbdata->lno_in_preimage++; + emit_context_line(ecbdata, line + 1, len - 1); + break; + default: + /* incomplete line at the end */ + ecbdata->lno_in_preimage++; + emit_diff_symbol(o, DIFF_SYMBOL_CONTEXT_INCOMPLETE, + line, len, 0); + break; + } + return 0; +} + +static void pprint_rename(struct strbuf *name, const char *a, const char *b) +{ + const char *old_name = a; + const char *new_name = b; + int pfx_length, sfx_length; + int pfx_adjust_for_slash; + int len_a = strlen(a); + int len_b = strlen(b); + int a_midlen, b_midlen; + int qlen_a = quote_c_style(a, NULL, NULL, 0); + int qlen_b = quote_c_style(b, NULL, NULL, 0); + + if (qlen_a || qlen_b) { + quote_c_style(a, name, NULL, 0); + strbuf_addstr(name, " => "); + quote_c_style(b, name, NULL, 0); + return; + } + + /* Find common prefix */ + pfx_length = 0; + while (*old_name && *new_name && *old_name == *new_name) { + if (*old_name == '/') + pfx_length = old_name - a + 1; + old_name++; + new_name++; + } + + /* Find common suffix */ + old_name = a + len_a; + new_name = b + len_b; + sfx_length = 0; + /* + * If there is a common prefix, it must end in a slash. In + * that case we let this loop run 1 into the prefix to see the + * same slash. + * + * If there is no common prefix, we cannot do this as it would + * underrun the input strings. + */ + pfx_adjust_for_slash = (pfx_length ? 1 : 0); + while (a + pfx_length - pfx_adjust_for_slash <= old_name && + b + pfx_length - pfx_adjust_for_slash <= new_name && + *old_name == *new_name) { + if (*old_name == '/') + sfx_length = len_a - (old_name - a); + old_name--; + new_name--; + } + + /* + * pfx{mid-a => mid-b}sfx + * {pfx-a => pfx-b}sfx + * pfx{sfx-a => sfx-b} + * name-a => name-b + */ + a_midlen = len_a - pfx_length - sfx_length; + b_midlen = len_b - pfx_length - sfx_length; + if (a_midlen < 0) + a_midlen = 0; + if (b_midlen < 0) + b_midlen = 0; + + strbuf_grow(name, pfx_length + a_midlen + b_midlen + sfx_length + 7); + if (pfx_length + sfx_length) { + strbuf_add(name, a, pfx_length); + strbuf_addch(name, '{'); + } + strbuf_add(name, a + pfx_length, a_midlen); + strbuf_addstr(name, " => "); + strbuf_add(name, b + pfx_length, b_midlen); + if (pfx_length + sfx_length) { + strbuf_addch(name, '}'); + strbuf_add(name, a + len_a - sfx_length, sfx_length); + } +} + +static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat, + const char *name_a, + const char *name_b) +{ + struct diffstat_file *x; + CALLOC_ARRAY(x, 1); + ALLOC_GROW(diffstat->files, diffstat->nr + 1, diffstat->alloc); + diffstat->files[diffstat->nr++] = x; + if (name_b) { + x->from_name = xstrdup(name_a); + x->name = xstrdup(name_b); + x->is_renamed = 1; + } + else { + x->from_name = NULL; + x->name = xstrdup(name_a); + } + return x; +} + +static int diffstat_consume(void *priv, char *line, unsigned long len) +{ + struct diffstat_t *diffstat = priv; + struct diffstat_file *x = diffstat->files[diffstat->nr - 1]; + + if (!len) + BUG("xdiff fed us an empty line"); + + if (line[0] == '+') + x->added++; + else if (line[0] == '-') + x->deleted++; + return 0; +} + +const char mime_boundary_leader[] = "------------"; + +static int scale_linear(int it, int width, int max_change) +{ + if (!it) + return 0; + /* + * make sure that at least one '-' or '+' is printed if + * there is any change to this path. The easiest way is to + * scale linearly as if the allotted width is one column shorter + * than it is, and then add 1 to the result. + */ + return 1 + (it * (width - 1) / max_change); +} + +static void show_graph(struct strbuf *out, char ch, int cnt, + const char *set, const char *reset) +{ + if (cnt <= 0) + return; + strbuf_addstr(out, set); + strbuf_addchars(out, ch, cnt); + strbuf_addstr(out, reset); +} + +static void fill_print_name(struct diffstat_file *file) +{ + struct strbuf pname = STRBUF_INIT; + + if (file->print_name) + return; + + if (file->is_renamed) + pprint_rename(&pname, file->from_name, file->name); + else + quote_c_style(file->name, &pname, NULL, 0); + + if (file->comments) + strbuf_addf(&pname, " (%s)", file->comments); + + file->print_name = strbuf_detach(&pname, NULL); +} + +static void print_stat_summary_inserts_deletes(struct diff_options *options, + int files, int insertions, int deletions) +{ + struct strbuf sb = STRBUF_INIT; + + if (!files) { + assert(insertions == 0 && deletions == 0); + emit_diff_symbol(options, DIFF_SYMBOL_STATS_SUMMARY_NO_FILES, + NULL, 0, 0); + return; + } + + strbuf_addf(&sb, + (files == 1) ? " %d file changed" : " %d files changed", + files); + + /* + * For binary diff, the caller may want to print "x files + * changed" with insertions == 0 && deletions == 0. + * + * Not omitting "0 insertions(+), 0 deletions(-)" in this case + * is probably less confusing (i.e skip over "2 files changed + * but nothing about added/removed lines? Is this a bug in Git?"). + */ + if (insertions || deletions == 0) { + strbuf_addf(&sb, + (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)", + insertions); + } + + if (deletions || insertions == 0) { + strbuf_addf(&sb, + (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)", + deletions); + } + strbuf_addch(&sb, '\n'); + emit_diff_symbol(options, DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES, + sb.buf, sb.len, 0); + strbuf_release(&sb); +} + +void print_stat_summary(FILE *fp, int files, + int insertions, int deletions) +{ + struct diff_options o; + memset(&o, 0, sizeof(o)); + o.file = fp; + + print_stat_summary_inserts_deletes(&o, files, insertions, deletions); +} + +static void show_stats(struct diffstat_t *data, struct diff_options *options) +{ + int i, len, add, del, adds = 0, dels = 0; + uintmax_t max_change = 0, max_len = 0; + int total_files = data->nr, count; + int width, name_width, graph_width, number_width = 0, bin_width = 0; + const char *reset, *add_c, *del_c; + int extra_shown = 0; + const char *line_prefix = diff_line_prefix(options); + struct strbuf out = STRBUF_INIT; + + if (data->nr == 0) + return; + + count = options->stat_count ? options->stat_count : data->nr; + + reset = diff_get_color_opt(options, DIFF_RESET); + add_c = diff_get_color_opt(options, DIFF_FILE_NEW); + del_c = diff_get_color_opt(options, DIFF_FILE_OLD); + + /* + * Find the longest filename and max number of changes + */ + for (i = 0; (i < count) && (i < data->nr); i++) { + struct diffstat_file *file = data->files[i]; + uintmax_t change = file->added + file->deleted; + + if (!file->is_interesting && (change == 0)) { + count++; /* not shown == room for one more */ + continue; + } + fill_print_name(file); + len = utf8_strwidth(file->print_name); + if (max_len < len) + max_len = len; + + if (file->is_unmerged) { + /* "Unmerged" is 8 characters */ + bin_width = bin_width < 8 ? 8 : bin_width; + continue; + } + if (file->is_binary) { + /* "Bin XXX -> YYY bytes" */ + int w = 14 + decimal_width(file->added) + + decimal_width(file->deleted); + bin_width = bin_width < w ? w : bin_width; + /* Display change counts aligned with "Bin" */ + number_width = 3; + continue; + } + + if (max_change < change) + max_change = change; + } + count = i; /* where we can stop scanning in data->files[] */ + + /* + * We have width = stat_width or term_columns() columns total. + * We want a maximum of min(max_len, stat_name_width) for the name part. + * We want a maximum of min(max_change, stat_graph_width) for the +- part. + * We also need 1 for " " and 4 + decimal_width(max_change) + * for " | NNNN " and one the empty column at the end, altogether + * 6 + decimal_width(max_change). + * + * If there's not enough space, we will use the smaller of + * stat_name_width (if set) and 5/8*width for the filename, + * and the rest for constant elements + graph part, but no more + * than stat_graph_width for the graph part. + * (5/8 gives 50 for filename and 30 for the constant parts + graph + * for the standard terminal size). + * + * In other words: stat_width limits the maximum width, and + * stat_name_width fixes the maximum width of the filename, + * and is also used to divide available columns if there + * aren't enough. + * + * Binary files are displayed with "Bin XXX -> YYY bytes" + * instead of the change count and graph. This part is treated + * similarly to the graph part, except that it is not + * "scaled". If total width is too small to accommodate the + * guaranteed minimum width of the filename part and the + * separators and this message, this message will "overflow" + * making the line longer than the maximum width. + */ + + /* + * NEEDSWORK: line_prefix is often used for "log --graph" output + * and contains ANSI-colored string. utf8_strnwidth() should be + * used to correctly count the display width instead of strlen(). + */ + if (options->stat_width == -1) + width = term_columns() - strlen(line_prefix); + else + width = options->stat_width ? options->stat_width : 80; + number_width = decimal_width(max_change) > number_width ? + decimal_width(max_change) : number_width; + + if (options->stat_name_width == -1) + options->stat_name_width = diff_stat_name_width; + if (options->stat_graph_width == -1) + options->stat_graph_width = diff_stat_graph_width; + + /* + * Guarantee 3/8*16 == 6 for the graph part + * and 5/8*16 == 10 for the filename part + */ + if (width < 16 + 6 + number_width) + width = 16 + 6 + number_width; + + /* + * First assign sizes that are wanted, ignoring available width. + * strlen("Bin XXX -> YYY bytes") == bin_width, and the part + * starting from "XXX" should fit in graph_width. + */ + graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4; + if (options->stat_graph_width && + options->stat_graph_width < graph_width) + graph_width = options->stat_graph_width; + + name_width = (options->stat_name_width > 0 && + options->stat_name_width < max_len) ? + options->stat_name_width : max_len; + + /* + * Adjust adjustable widths not to exceed maximum width + */ + if (name_width + number_width + 6 + graph_width > width) { + if (graph_width > width * 3/8 - number_width - 6) { + graph_width = width * 3/8 - number_width - 6; + if (graph_width < 6) + graph_width = 6; + } + + if (options->stat_graph_width && + graph_width > options->stat_graph_width) + graph_width = options->stat_graph_width; + if (name_width > width - number_width - 6 - graph_width) + name_width = width - number_width - 6 - graph_width; + else + graph_width = width - number_width - 6 - name_width; + } + + /* + * From here name_width is the width of the name area, + * and graph_width is the width of the graph area. + * max_change is used to scale graph properly. + */ + for (i = 0; i < count; i++) { + const char *prefix = ""; + struct diffstat_file *file = data->files[i]; + char *name = file->print_name; + uintmax_t added = file->added; + uintmax_t deleted = file->deleted; + int name_len, padding; + + if (!file->is_interesting && (added + deleted == 0)) + continue; + + /* + * "scale" the filename + */ + len = name_width; + name_len = utf8_strwidth(name); + if (name_width < name_len) { + char *slash; + prefix = "..."; + len -= 3; + /* + * NEEDSWORK: (name_len - len) counts the display + * width, which would be shorter than the byte + * length of the corresponding substring. + * Advancing "name" by that number of bytes does + * *NOT* skip over that many columns, so it is + * very likely that chomping the pathname at the + * slash we will find starting from "name" will + * leave the resulting string still too long. + */ + name += name_len - len; + slash = strchr(name, '/'); + if (slash) + name = slash; + } + padding = len - utf8_strwidth(name); + if (padding < 0) + padding = 0; + + if (file->is_binary) { + strbuf_addf(&out, " %s%s%*s | %*s", + prefix, name, padding, "", + number_width, "Bin"); + if (!added && !deleted) { + strbuf_addch(&out, '\n'); + emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE, + out.buf, out.len, 0); + strbuf_reset(&out); + continue; + } + strbuf_addf(&out, " %s%"PRIuMAX"%s", + del_c, deleted, reset); + strbuf_addstr(&out, " -> "); + strbuf_addf(&out, "%s%"PRIuMAX"%s", + add_c, added, reset); + strbuf_addstr(&out, " bytes\n"); + emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE, + out.buf, out.len, 0); + strbuf_reset(&out); + continue; + } + else if (file->is_unmerged) { + strbuf_addf(&out, " %s%s%*s | %*s", + prefix, name, padding, "", + number_width, "Unmerged\n"); + emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE, + out.buf, out.len, 0); + strbuf_reset(&out); + continue; + } + + /* + * scale the add/delete + */ + add = added; + del = deleted; + + if (graph_width <= max_change) { + int total = scale_linear(add + del, graph_width, max_change); + if (total < 2 && add && del) + /* width >= 2 due to the sanity check */ + total = 2; + if (add < del) { + add = scale_linear(add, graph_width, max_change); + del = total - add; + } else { + del = scale_linear(del, graph_width, max_change); + add = total - del; + } + } + strbuf_addf(&out, " %s%s%*s | %*"PRIuMAX"%s", + prefix, name, padding, "", + number_width, added + deleted, + added + deleted ? " " : ""); + show_graph(&out, '+', add, add_c, reset); + show_graph(&out, '-', del, del_c, reset); + strbuf_addch(&out, '\n'); + emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE, + out.buf, out.len, 0); + strbuf_reset(&out); + } + + for (i = 0; i < data->nr; i++) { + struct diffstat_file *file = data->files[i]; + uintmax_t added = file->added; + uintmax_t deleted = file->deleted; + + if (file->is_unmerged || + (!file->is_interesting && (added + deleted == 0))) { + total_files--; + continue; + } + + if (!file->is_binary) { + adds += added; + dels += deleted; + } + if (i < count) + continue; + if (!extra_shown) + emit_diff_symbol(options, + DIFF_SYMBOL_STATS_SUMMARY_ABBREV, + NULL, 0, 0); + extra_shown = 1; + } + + print_stat_summary_inserts_deletes(options, total_files, adds, dels); + strbuf_release(&out); +} + +static void show_shortstats(struct diffstat_t *data, struct diff_options *options) +{ + int i, adds = 0, dels = 0, total_files = data->nr; + + if (data->nr == 0) + return; + + for (i = 0; i < data->nr; i++) { + int added = data->files[i]->added; + int deleted = data->files[i]->deleted; + + if (data->files[i]->is_unmerged || + (!data->files[i]->is_interesting && (added + deleted == 0))) { + total_files--; + } else if (!data->files[i]->is_binary) { /* don't count bytes */ + adds += added; + dels += deleted; + } + } + print_stat_summary_inserts_deletes(options, total_files, adds, dels); +} + +static void show_numstat(struct diffstat_t *data, struct diff_options *options) +{ + int i; + + if (data->nr == 0) + return; + + for (i = 0; i < data->nr; i++) { + struct diffstat_file *file = data->files[i]; + + fprintf(options->file, "%s", diff_line_prefix(options)); + + if (file->is_binary) + fprintf(options->file, "-\t-\t"); + else + fprintf(options->file, + "%"PRIuMAX"\t%"PRIuMAX"\t", + file->added, file->deleted); + if (options->line_termination) { + fill_print_name(file); + if (!file->is_renamed) + write_name_quoted(file->name, options->file, + options->line_termination); + else { + fputs(file->print_name, options->file); + putc(options->line_termination, options->file); + } + } else { + if (file->is_renamed) { + putc('\0', options->file); + write_name_quoted(file->from_name, options->file, '\0'); + } + write_name_quoted(file->name, options->file, '\0'); + } + } +} + +struct dirstat_file { + const char *name; + unsigned long changed; +}; + +struct dirstat_dir { + struct dirstat_file *files; + int alloc, nr, permille, cumulative; +}; + +static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir, + unsigned long changed, const char *base, int baselen) +{ + unsigned long sum_changes = 0; + unsigned int sources = 0; + const char *line_prefix = diff_line_prefix(opt); + + while (dir->nr) { + struct dirstat_file *f = dir->files; + int namelen = strlen(f->name); + unsigned long changes; + char *slash; + + if (namelen < baselen) + break; + if (memcmp(f->name, base, baselen)) + break; + slash = strchr(f->name + baselen, '/'); + if (slash) { + int newbaselen = slash + 1 - f->name; + changes = gather_dirstat(opt, dir, changed, f->name, newbaselen); + sources++; + } else { + changes = f->changed; + dir->files++; + dir->nr--; + sources += 2; + } + sum_changes += changes; + } + + /* + * We don't report dirstat's for + * - the top level + * - or cases where everything came from a single directory + * under this directory (sources == 1). + */ + if (baselen && sources != 1) { + if (sum_changes) { + int permille = sum_changes * 1000 / changed; + if (permille >= dir->permille) { + fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix, + permille / 10, permille % 10, baselen, base); + if (!dir->cumulative) + return 0; + } + } + } + return sum_changes; +} + +static int dirstat_compare(const void *_a, const void *_b) +{ + const struct dirstat_file *a = _a; + const struct dirstat_file *b = _b; + return strcmp(a->name, b->name); +} + +static void conclude_dirstat(struct diff_options *options, + struct dirstat_dir *dir, + unsigned long changed) +{ + struct dirstat_file *to_free = dir->files; + + if (!changed) { + /* This can happen even with many files, if everything was renames */ + ; + } else { + /* Show all directories with more than x% of the changes */ + QSORT(dir->files, dir->nr, dirstat_compare); + gather_dirstat(options, dir, changed, "", 0); + } + + free(to_free); +} + +static void show_dirstat(struct diff_options *options) +{ + int i; + unsigned long changed; + struct dirstat_dir dir; + struct diff_queue_struct *q = &diff_queued_diff; + + dir.files = NULL; + dir.alloc = 0; + dir.nr = 0; + dir.permille = options->dirstat_permille; + dir.cumulative = options->flags.dirstat_cumulative; + + changed = 0; + for (i = 0; i < q->nr; i++) { + struct diff_filepair *p = q->queue[i]; + const char *name; + unsigned long copied, added, damage; + struct diff_populate_filespec_options dpf_options = { + .check_size_only = 1, + }; + + name = p->two->path ? p->two->path : p->one->path; + + if (p->one->oid_valid && p->two->oid_valid && + oideq(&p->one->oid, &p->two->oid)) { + /* + * The SHA1 has not changed, so pre-/post-content is + * identical. We can therefore skip looking at the + * file contents altogether. + */ + damage = 0; + goto found_damage; + } + + if (options->flags.dirstat_by_file) { + /* + * In --dirstat-by-file mode, we don't really need to + * look at the actual file contents at all. + * The fact that the SHA1 changed is enough for us to + * add this file to the list of results + * (with each file contributing equal damage). + */ + damage = 1; + goto found_damage; + } + + if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) { + diff_populate_filespec(options->repo, p->one, NULL); + diff_populate_filespec(options->repo, p->two, NULL); + diffcore_count_changes(options->repo, + p->one, p->two, NULL, NULL, + &copied, &added); + diff_free_filespec_data(p->one); + diff_free_filespec_data(p->two); + } else if (DIFF_FILE_VALID(p->one)) { + diff_populate_filespec(options->repo, p->one, &dpf_options); + copied = added = 0; + diff_free_filespec_data(p->one); + } else if (DIFF_FILE_VALID(p->two)) { + diff_populate_filespec(options->repo, p->two, &dpf_options); + copied = 0; + added = p->two->size; + diff_free_filespec_data(p->two); + } else + continue; + + /* + * Original minus copied is the removed material, + * added is the new material. They are both damages + * made to the preimage. + * If the resulting damage is zero, we know that + * diffcore_count_changes() considers the two entries to + * be identical, but since the oid changed, we + * know that there must have been _some_ kind of change, + * so we force all entries to have damage > 0. + */ + damage = (p->one->size - copied) + added; + if (!damage) + damage = 1; + +found_damage: + ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc); + dir.files[dir.nr].name = name; + dir.files[dir.nr].changed = damage; + changed += damage; + dir.nr++; + } + + conclude_dirstat(options, &dir, changed); +} + +static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options) +{ + int i; + unsigned long changed; + struct dirstat_dir dir; + + if (data->nr == 0) + return; + + dir.files = NULL; + dir.alloc = 0; + dir.nr = 0; + dir.permille = options->dirstat_permille; + dir.cumulative = options->flags.dirstat_cumulative; + + changed = 0; + for (i = 0; i < data->nr; i++) { + struct diffstat_file *file = data->files[i]; + unsigned long damage = file->added + file->deleted; + if (file->is_binary) + /* + * binary files counts bytes, not lines. Must find some + * way to normalize binary bytes vs. textual lines. + * The following heuristic assumes that there are 64 + * bytes per "line". + * This is stupid and ugly, but very cheap... + */ + damage = DIV_ROUND_UP(damage, 64); + ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc); + dir.files[dir.nr].name = file->name; + dir.files[dir.nr].changed = damage; + changed += damage; + dir.nr++; + } + + conclude_dirstat(options, &dir, changed); +} + +static void free_diffstat_file(struct diffstat_file *f) +{ + free(f->print_name); + free(f->name); + free(f->from_name); + free(f); +} + +void free_diffstat_info(struct diffstat_t *diffstat) +{ + int i; + for (i = 0; i < diffstat->nr; i++) + free_diffstat_file(diffstat->files[i]); + free(diffstat->files); +} + +struct checkdiff_t { + const char *filename; + int lineno; + int conflict_marker_size; + struct diff_options *o; + unsigned ws_rule; + unsigned status; +}; + +static int is_conflict_marker(const char *line, int marker_size, unsigned long len) +{ + char firstchar; + int cnt; + + if (len < marker_size + 1) + return 0; + firstchar = line[0]; + switch (firstchar) { + case '=': case '>': case '<': case '|': + break; + default: + return 0; + } + for (cnt = 1; cnt < marker_size; cnt++) + if (line[cnt] != firstchar) + return 0; + /* line[1] through line[marker_size-1] are same as firstchar */ + if (len < marker_size + 1 || !isspace(line[marker_size])) + return 0; + return 1; +} + +static void checkdiff_consume_hunk(void *priv, + long ob UNUSED, long on UNUSED, + long nb, long nn UNUSED, + const char *func UNUSED, long funclen UNUSED) + +{ + struct checkdiff_t *data = priv; + data->lineno = nb - 1; +} + +static int checkdiff_consume(void *priv, char *line, unsigned long len) +{ + struct checkdiff_t *data = priv; + int marker_size = data->conflict_marker_size; + const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE); + const char *reset = diff_get_color(data->o->use_color, DIFF_RESET); + const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW); + char *err; + const char *line_prefix; + + assert(data->o); + line_prefix = diff_line_prefix(data->o); + + if (line[0] == '+') { + unsigned bad; + data->lineno++; + if (is_conflict_marker(line + 1, marker_size, len - 1)) { + data->status |= 1; + fprintf(data->o->file, + "%s%s:%d: leftover conflict marker\n", + line_prefix, data->filename, data->lineno); + } + bad = ws_check(line + 1, len - 1, data->ws_rule); + if (!bad) + return 0; + data->status |= bad; + err = whitespace_error_string(bad); + fprintf(data->o->file, "%s%s:%d: %s.\n", + line_prefix, data->filename, data->lineno, err); + free(err); + emit_line(data->o, set, reset, line, 1); + ws_check_emit(line + 1, len - 1, data->ws_rule, + data->o->file, set, reset, ws); + } else if (line[0] == ' ') { + data->lineno++; + } + return 0; +} + +static unsigned char *deflate_it(char *data, + unsigned long size, + unsigned long *result_size) +{ + int bound; + unsigned char *deflated; + git_zstream stream; + + git_deflate_init(&stream, zlib_compression_level); + bound = git_deflate_bound(&stream, size); + deflated = xmalloc(bound); + stream.next_out = deflated; + stream.avail_out = bound; + + stream.next_in = (unsigned char *)data; + stream.avail_in = size; + while (git_deflate(&stream, Z_FINISH) == Z_OK) + ; /* nothing */ + git_deflate_end(&stream); + *result_size = stream.total_out; + return deflated; +} + +static void emit_binary_diff_body(struct diff_options *o, + mmfile_t *one, mmfile_t *two) +{ + void *cp; + void *delta; + void *deflated; + void *data; + unsigned long orig_size; + unsigned long delta_size; + unsigned long deflate_size; + unsigned long data_size; + + /* We could do deflated delta, or we could do just deflated two, + * whichever is smaller. + */ + delta = NULL; + deflated = deflate_it(two->ptr, two->size, &deflate_size); + if (one->size && two->size) { + delta = diff_delta(one->ptr, one->size, + two->ptr, two->size, + &delta_size, deflate_size); + if (delta) { + void *to_free = delta; + orig_size = delta_size; + delta = deflate_it(delta, delta_size, &delta_size); + free(to_free); + } + } + + if (delta && delta_size < deflate_size) { + char *s = xstrfmt("%"PRIuMAX , (uintmax_t)orig_size); + emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA, + s, strlen(s), 0); + free(s); + free(deflated); + data = delta; + data_size = delta_size; + } else { + char *s = xstrfmt("%lu", two->size); + emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL, + s, strlen(s), 0); + free(s); + free(delta); + data = deflated; + data_size = deflate_size; + } + + /* emit data encoded in base85 */ + cp = data; + while (data_size) { + int len; + int bytes = (52 < data_size) ? 52 : data_size; + char line[71]; + data_size -= bytes; + if (bytes <= 26) + line[0] = bytes + 'A' - 1; + else + line[0] = bytes - 26 + 'a' - 1; + encode_85(line + 1, cp, bytes); + cp = (char *) cp + bytes; + + len = strlen(line); + line[len++] = '\n'; + line[len] = '\0'; + + emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_BODY, + line, len, 0); + } + emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_FOOTER, NULL, 0, 0); + free(data); +} + +static void emit_binary_diff(struct diff_options *o, + mmfile_t *one, mmfile_t *two) +{ + emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER, NULL, 0, 0); + emit_binary_diff_body(o, one, two); + emit_binary_diff_body(o, two, one); +} + +int diff_filespec_is_binary(struct repository *r, + struct diff_filespec *one) +{ + struct diff_populate_filespec_options dpf_options = { + .check_binary = 1, + }; + + if (one->is_binary == -1) { + diff_filespec_load_driver(one, r->index); + if (one->driver->binary != -1) + one->is_binary = one->driver->binary; + else { + if (!one->data && DIFF_FILE_VALID(one)) + diff_populate_filespec(r, one, &dpf_options); + if (one->is_binary == -1 && one->data) + one->is_binary = buffer_is_binary(one->data, + one->size); + if (one->is_binary == -1) + one->is_binary = 0; + } + } + return one->is_binary; +} + +static const struct userdiff_funcname * +diff_funcname_pattern(struct diff_options *o, struct diff_filespec *one) +{ + diff_filespec_load_driver(one, o->repo->index); + return one->driver->funcname.pattern ? &one->driver->funcname : NULL; +} + +void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b) +{ + if (!options->a_prefix) + options->a_prefix = a; + if (!options->b_prefix) + options->b_prefix = b; +} + +void diff_set_noprefix(struct diff_options *options) +{ + options->a_prefix = options->b_prefix = ""; +} + +void diff_set_default_prefix(struct diff_options *options) +{ + options->a_prefix = "a/"; + options->b_prefix = "b/"; +} + +struct userdiff_driver *get_textconv(struct repository *r, + struct diff_filespec *one) +{ + if (!DIFF_FILE_VALID(one)) + return NULL; + + diff_filespec_load_driver(one, r->index); + return userdiff_get_textconv(r, one->driver); +} + +static struct string_list *additional_headers(struct diff_options *o, + const char *path) +{ + if (!o->additional_path_headers) + return NULL; + return strmap_get(o->additional_path_headers, path); +} + +static void add_formatted_header(struct strbuf *msg, + const char *header, + const char *line_prefix, + const char *meta, + const char *reset) +{ + const char *next, *newline; + + for (next = header; *next; next = newline) { + newline = strchrnul(next, '\n'); + strbuf_addf(msg, "%s%s%.*s%s\n", line_prefix, meta, + (int)(newline - next), next, reset); + if (*newline) + newline++; + } +} + +static void add_formatted_headers(struct strbuf *msg, + struct string_list *more_headers, + const char *line_prefix, + const char *meta, + const char *reset) +{ + int i; + + for (i = 0; i < more_headers->nr; i++) + add_formatted_header(msg, more_headers->items[i].string, + line_prefix, meta, reset); +} + +static int diff_filepair_is_phoney(struct diff_filespec *one, + struct diff_filespec *two) +{ + /* + * This function specifically looks for pairs injected by + * create_filepairs_for_header_only_notifications(). Such + * pairs are "phoney" in that they do not represent any + * content or even mode difference, but were inserted because + * diff_queued_diff previously had no pair associated with + * that path but we needed some pair to avoid losing the + * "remerge CONFLICT" header associated with the path. + */ + return !DIFF_FILE_VALID(one) && !DIFF_FILE_VALID(two); +} + +static int set_diff_algorithm(struct diff_options *opts, + const char *alg) +{ + long value = parse_algorithm_value(alg); + + if (value < 0) + return -1; + + /* clear out previous settings */ + DIFF_XDL_CLR(opts, NEED_MINIMAL); + opts->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK; + opts->xdl_opts |= value; + + return 0; +} + +static void builtin_diff(const char *name_a, + const char *name_b, + struct diff_filespec *one, + struct diff_filespec *two, + const char *xfrm_msg, + int must_show_header, + struct diff_options *o, + int complete_rewrite) +{ + mmfile_t mf1, mf2; + const char *lbl[2]; + char *a_one, *b_two; + const char *meta = diff_get_color_opt(o, DIFF_METAINFO); + const char *reset = diff_get_color_opt(o, DIFF_RESET); + const char *a_prefix, *b_prefix; + struct userdiff_driver *textconv_one = NULL; + struct userdiff_driver *textconv_two = NULL; + struct strbuf header = STRBUF_INIT; + const char *line_prefix = diff_line_prefix(o); + + diff_set_mnemonic_prefix(o, "a/", "b/"); + if (o->flags.reverse_diff) { + a_prefix = o->b_prefix; + b_prefix = o->a_prefix; + } else { + a_prefix = o->a_prefix; + b_prefix = o->b_prefix; + } + + if (o->submodule_format == DIFF_SUBMODULE_LOG && + (!one->mode || S_ISGITLINK(one->mode)) && + (!two->mode || S_ISGITLINK(two->mode)) && + (!diff_filepair_is_phoney(one, two))) { + show_submodule_diff_summary(o, one->path ? one->path : two->path, + &one->oid, &two->oid, + two->dirty_submodule); + return; + } else if (o->submodule_format == DIFF_SUBMODULE_INLINE_DIFF && + (!one->mode || S_ISGITLINK(one->mode)) && + (!two->mode || S_ISGITLINK(two->mode)) && + (!diff_filepair_is_phoney(one, two))) { + show_submodule_inline_diff(o, one->path ? one->path : two->path, + &one->oid, &two->oid, + two->dirty_submodule); + return; + } + + if (o->flags.allow_textconv) { + textconv_one = get_textconv(o->repo, one); + textconv_two = get_textconv(o->repo, two); + } + + /* Never use a non-valid filename anywhere if at all possible */ + name_a = DIFF_FILE_VALID(one) ? name_a : name_b; + name_b = DIFF_FILE_VALID(two) ? name_b : name_a; + + a_one = quote_two(a_prefix, name_a + (*name_a == '/')); + b_two = quote_two(b_prefix, name_b + (*name_b == '/')); + lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null"; + lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null"; + if (diff_filepair_is_phoney(one, two)) { + /* + * We should only reach this point for pairs generated from + * create_filepairs_for_header_only_notifications(). For + * these, we want to avoid the "/dev/null" special casing + * above, because we do not want such pairs shown as either + * "new file" or "deleted file" below. + */ + lbl[0] = a_one; + lbl[1] = b_two; + } + strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset); + if (lbl[0][0] == '/') { + /* /dev/null */ + strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset); + if (xfrm_msg) + strbuf_addstr(&header, xfrm_msg); + o->found_changes = 1; + must_show_header = 1; + } + else if (lbl[1][0] == '/') { + strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset); + if (xfrm_msg) + strbuf_addstr(&header, xfrm_msg); + o->found_changes = 1; + must_show_header = 1; + } + else { + if (one->mode != two->mode) { + strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset); + strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset); + o->found_changes = 1; + must_show_header = 1; + } + if (xfrm_msg) + strbuf_addstr(&header, xfrm_msg); + + /* + * we do not run diff between different kind + * of objects. + */ + if ((one->mode ^ two->mode) & S_IFMT) + goto free_ab_and_return; + if (complete_rewrite && + (textconv_one || !diff_filespec_is_binary(o->repo, one)) && + (textconv_two || !diff_filespec_is_binary(o->repo, two))) { + emit_diff_symbol(o, DIFF_SYMBOL_HEADER, + header.buf, header.len, 0); + strbuf_reset(&header); + emit_rewrite_diff(name_a, name_b, one, two, + textconv_one, textconv_two, o); + o->found_changes = 1; + goto free_ab_and_return; + } + } + + if (o->irreversible_delete && lbl[1][0] == '/') { + emit_diff_symbol(o, DIFF_SYMBOL_HEADER, header.buf, + header.len, 0); + strbuf_reset(&header); + goto free_ab_and_return; + } else if (!o->flags.text && + ( (!textconv_one && diff_filespec_is_binary(o->repo, one)) || + (!textconv_two && diff_filespec_is_binary(o->repo, two)) )) { + struct strbuf sb = STRBUF_INIT; + if (!one->data && !two->data && + S_ISREG(one->mode) && S_ISREG(two->mode) && + !o->flags.binary) { + if (oideq(&one->oid, &two->oid)) { + if (must_show_header) + emit_diff_symbol(o, DIFF_SYMBOL_HEADER, + header.buf, header.len, + 0); + goto free_ab_and_return; + } + emit_diff_symbol(o, DIFF_SYMBOL_HEADER, + header.buf, header.len, 0); + strbuf_addf(&sb, "%sBinary files %s and %s differ\n", + diff_line_prefix(o), lbl[0], lbl[1]); + emit_diff_symbol(o, DIFF_SYMBOL_BINARY_FILES, + sb.buf, sb.len, 0); + strbuf_release(&sb); + goto free_ab_and_return; + } + if (fill_mmfile(o->repo, &mf1, one) < 0 || + fill_mmfile(o->repo, &mf2, two) < 0) + die("unable to read files to diff"); + /* Quite common confusing case */ + if (mf1.size == mf2.size && + !memcmp(mf1.ptr, mf2.ptr, mf1.size)) { + if (must_show_header) + emit_diff_symbol(o, DIFF_SYMBOL_HEADER, + header.buf, header.len, 0); + goto free_ab_and_return; + } + emit_diff_symbol(o, DIFF_SYMBOL_HEADER, header.buf, header.len, 0); + strbuf_reset(&header); + if (o->flags.binary) + emit_binary_diff(o, &mf1, &mf2); + else { + strbuf_addf(&sb, "%sBinary files %s and %s differ\n", + diff_line_prefix(o), lbl[0], lbl[1]); + emit_diff_symbol(o, DIFF_SYMBOL_BINARY_FILES, + sb.buf, sb.len, 0); + strbuf_release(&sb); + } + o->found_changes = 1; + } else { + /* Crazy xdl interfaces.. */ + const char *diffopts; + const char *v; + xpparam_t xpp; + xdemitconf_t xecfg; + struct emit_callback ecbdata; + const struct userdiff_funcname *pe; + + if (must_show_header) { + emit_diff_symbol(o, DIFF_SYMBOL_HEADER, + header.buf, header.len, 0); + strbuf_reset(&header); + } + + mf1.size = fill_textconv(o->repo, textconv_one, one, &mf1.ptr); + mf2.size = fill_textconv(o->repo, textconv_two, two, &mf2.ptr); + + pe = diff_funcname_pattern(o, one); + if (!pe) + pe = diff_funcname_pattern(o, two); + + memset(&xpp, 0, sizeof(xpp)); + memset(&xecfg, 0, sizeof(xecfg)); + memset(&ecbdata, 0, sizeof(ecbdata)); + if (o->flags.suppress_diff_headers) + lbl[0] = NULL; + ecbdata.label_path = lbl; + ecbdata.color_diff = want_color(o->use_color); + ecbdata.ws_rule = whitespace_rule(o->repo->index, name_b); + if (ecbdata.ws_rule & WS_BLANK_AT_EOF) + check_blank_at_eof(&mf1, &mf2, &ecbdata); + ecbdata.opt = o; + if (header.len && !o->flags.suppress_diff_headers) + ecbdata.header = &header; + xpp.flags = o->xdl_opts; + xpp.ignore_regex = o->ignore_regex; + xpp.ignore_regex_nr = o->ignore_regex_nr; + xpp.anchors = o->anchors; + xpp.anchors_nr = o->anchors_nr; + xecfg.ctxlen = o->context; + xecfg.interhunkctxlen = o->interhunkcontext; + xecfg.flags = XDL_EMIT_FUNCNAMES; + if (o->flags.funccontext) + xecfg.flags |= XDL_EMIT_FUNCCONTEXT; + if (pe) + xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags); + + diffopts = getenv("GIT_DIFF_OPTS"); + if (!diffopts) + ; + else if (skip_prefix(diffopts, "--unified=", &v)) + xecfg.ctxlen = strtoul(v, NULL, 10); + else if (skip_prefix(diffopts, "-u", &v)) + xecfg.ctxlen = strtoul(v, NULL, 10); + + if (o->word_diff) + init_diff_words_data(&ecbdata, o, one, two); + if (xdi_diff_outf(&mf1, &mf2, NULL, fn_out_consume, + &ecbdata, &xpp, &xecfg)) + die("unable to generate diff for %s", one->path); + if (o->word_diff) + free_diff_words_data(&ecbdata); + if (textconv_one) + free(mf1.ptr); + if (textconv_two) + free(mf2.ptr); + xdiff_clear_find_func(&xecfg); + } + + free_ab_and_return: + strbuf_release(&header); + diff_free_filespec_data(one); + diff_free_filespec_data(two); + free(a_one); + free(b_two); + return; +} + +static char *get_compact_summary(const struct diff_filepair *p, int is_renamed) +{ + if (!is_renamed) { + if (p->status == DIFF_STATUS_ADDED) { + if (S_ISLNK(p->two->mode)) + return "new +l"; + else if ((p->two->mode & 0777) == 0755) + return "new +x"; + else + return "new"; + } else if (p->status == DIFF_STATUS_DELETED) + return "gone"; + } + if (S_ISLNK(p->one->mode) && !S_ISLNK(p->two->mode)) + return "mode -l"; + else if (!S_ISLNK(p->one->mode) && S_ISLNK(p->two->mode)) + return "mode +l"; + else if ((p->one->mode & 0777) == 0644 && + (p->two->mode & 0777) == 0755) + return "mode +x"; + else if ((p->one->mode & 0777) == 0755 && + (p->two->mode & 0777) == 0644) + return "mode -x"; + return NULL; +} + +static void builtin_diffstat(const char *name_a, const char *name_b, + struct diff_filespec *one, + struct diff_filespec *two, + struct diffstat_t *diffstat, + struct diff_options *o, + struct diff_filepair *p) +{ + mmfile_t mf1, mf2; + struct diffstat_file *data; + int may_differ; + int complete_rewrite = 0; + + if (!DIFF_PAIR_UNMERGED(p)) { + if (p->status == DIFF_STATUS_MODIFIED && p->score) + complete_rewrite = 1; + } + + data = diffstat_add(diffstat, name_a, name_b); + data->is_interesting = p->status != DIFF_STATUS_UNKNOWN; + if (o->flags.stat_with_summary) + data->comments = get_compact_summary(p, data->is_renamed); + + if (!one || !two) { + data->is_unmerged = 1; + return; + } + + /* saves some reads if true, not a guarantee of diff outcome */ + may_differ = !(one->oid_valid && two->oid_valid && + oideq(&one->oid, &two->oid)); + + if (diff_filespec_is_binary(o->repo, one) || + diff_filespec_is_binary(o->repo, two)) { + data->is_binary = 1; + if (!may_differ) { + data->added = 0; + data->deleted = 0; + } else { + data->added = diff_filespec_size(o->repo, two); + data->deleted = diff_filespec_size(o->repo, one); + } + } + + else if (complete_rewrite) { + diff_populate_filespec(o->repo, one, NULL); + diff_populate_filespec(o->repo, two, NULL); + data->deleted = count_lines(one->data, one->size); + data->added = count_lines(two->data, two->size); + } + + else if (may_differ) { + /* Crazy xdl interfaces.. */ + xpparam_t xpp; + xdemitconf_t xecfg; + + if (fill_mmfile(o->repo, &mf1, one) < 0 || + fill_mmfile(o->repo, &mf2, two) < 0) + die("unable to read files to diff"); + + memset(&xpp, 0, sizeof(xpp)); + memset(&xecfg, 0, sizeof(xecfg)); + xpp.flags = o->xdl_opts; + xpp.ignore_regex = o->ignore_regex; + xpp.ignore_regex_nr = o->ignore_regex_nr; + xpp.anchors = o->anchors; + xpp.anchors_nr = o->anchors_nr; + xecfg.ctxlen = o->context; + xecfg.interhunkctxlen = o->interhunkcontext; + xecfg.flags = XDL_EMIT_NO_HUNK_HDR; + if (xdi_diff_outf(&mf1, &mf2, NULL, + diffstat_consume, diffstat, &xpp, &xecfg)) + die("unable to generate diffstat for %s", one->path); + + if (DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two)) { + struct diffstat_file *file = + diffstat->files[diffstat->nr - 1]; + /* + * Omit diffstats of modified files where nothing changed. + * Even if may_differ, this might be the case due to + * ignoring whitespace changes, etc. + * + * But note that we special-case additions, deletions, + * renames, and mode changes as adding an empty file, + * for example is still of interest. + */ + if ((p->status == DIFF_STATUS_MODIFIED) + && !file->added + && !file->deleted + && one->mode == two->mode) { + free_diffstat_file(file); + diffstat->nr--; + } + } + } + + diff_free_filespec_data(one); + diff_free_filespec_data(two); +} + +static void builtin_checkdiff(const char *name_a, const char *name_b, + const char *attr_path, + struct diff_filespec *one, + struct diff_filespec *two, + struct diff_options *o) +{ + mmfile_t mf1, mf2; + struct checkdiff_t data; + + if (!two) + return; + + memset(&data, 0, sizeof(data)); + data.filename = name_b ? name_b : name_a; + data.lineno = 0; + data.o = o; + data.ws_rule = whitespace_rule(o->repo->index, attr_path); + data.conflict_marker_size = ll_merge_marker_size(o->repo->index, attr_path); + + if (fill_mmfile(o->repo, &mf1, one) < 0 || + fill_mmfile(o->repo, &mf2, two) < 0) + die("unable to read files to diff"); + + /* + * All the other codepaths check both sides, but not checking + * the "old" side here is deliberate. We are checking the newly + * introduced changes, and as long as the "new" side is text, we + * can and should check what it introduces. + */ + if (diff_filespec_is_binary(o->repo, two)) + goto free_and_return; + else { + /* Crazy xdl interfaces.. */ + xpparam_t xpp; + xdemitconf_t xecfg; + + memset(&xpp, 0, sizeof(xpp)); + memset(&xecfg, 0, sizeof(xecfg)); + xecfg.ctxlen = 1; /* at least one context line */ + xpp.flags = 0; + if (xdi_diff_outf(&mf1, &mf2, checkdiff_consume_hunk, + checkdiff_consume, &data, + &xpp, &xecfg)) + die("unable to generate checkdiff for %s", one->path); + + if (data.ws_rule & WS_BLANK_AT_EOF) { + struct emit_callback ecbdata; + int blank_at_eof; + + ecbdata.ws_rule = data.ws_rule; + check_blank_at_eof(&mf1, &mf2, &ecbdata); + blank_at_eof = ecbdata.blank_at_eof_in_postimage; + + if (blank_at_eof) { + static char *err; + if (!err) + err = whitespace_error_string(WS_BLANK_AT_EOF); + fprintf(o->file, "%s:%d: %s.\n", + data.filename, blank_at_eof, err); + data.status = 1; /* report errors */ + } + } + } + free_and_return: + diff_free_filespec_data(one); + diff_free_filespec_data(two); + if (data.status) + o->flags.check_failed = 1; +} + +struct diff_filespec *alloc_filespec(const char *path) +{ + struct diff_filespec *spec; + + FLEXPTR_ALLOC_STR(spec, path, path); + spec->count = 1; + spec->is_binary = -1; + return spec; +} + +void free_filespec(struct diff_filespec *spec) +{ + if (!--spec->count) { + diff_free_filespec_data(spec); + free(spec); + } +} + +void fill_filespec(struct diff_filespec *spec, const struct object_id *oid, + int oid_valid, unsigned short mode) +{ + if (mode) { + spec->mode = canon_mode(mode); + oidcpy(&spec->oid, oid); + spec->oid_valid = oid_valid; + } +} + +/* + * Given a name and sha1 pair, if the index tells us the file in + * the work tree has that object contents, return true, so that + * prepare_temp_file() does not have to inflate and extract. + */ +static int reuse_worktree_file(struct index_state *istate, + const char *name, + const struct object_id *oid, + int want_file) +{ + const struct cache_entry *ce; + struct stat st; + int pos, len; + + /* + * We do not read the cache ourselves here, because the + * benchmark with my previous version that always reads cache + * shows that it makes things worse for diff-tree comparing + * two linux-2.6 kernel trees in an already checked out work + * tree. This is because most diff-tree comparisons deal with + * only a small number of files, while reading the cache is + * expensive for a large project, and its cost outweighs the + * savings we get by not inflating the object to a temporary + * file. Practically, this code only helps when we are used + * by diff-cache --cached, which does read the cache before + * calling us. + */ + if (!istate->cache) + return 0; + + /* We want to avoid the working directory if our caller + * doesn't need the data in a normal file, this system + * is rather slow with its stat/open/mmap/close syscalls, + * and the object is contained in a pack file. The pack + * is probably already open and will be faster to obtain + * the data through than the working directory. Loose + * objects however would tend to be slower as they need + * to be individually opened and inflated. + */ + if (!FAST_WORKING_DIRECTORY && !want_file && has_object_pack(oid)) + return 0; + + /* + * Similarly, if we'd have to convert the file contents anyway, that + * makes the optimization not worthwhile. + */ + if (!want_file && would_convert_to_git(istate, name)) + return 0; + + /* + * If this path does not match our sparse-checkout definition, + * then the file will not be in the working directory. + */ + if (!path_in_sparse_checkout(name, istate)) + return 0; + + len = strlen(name); + pos = index_name_pos(istate, name, len); + if (pos < 0) + return 0; + ce = istate->cache[pos]; + + /* + * This is not the sha1 we are looking for, or + * unreusable because it is not a regular file. + */ + if (!oideq(oid, &ce->oid) || !S_ISREG(ce->ce_mode)) + return 0; + + /* + * If ce is marked as "assume unchanged", there is no + * guarantee that work tree matches what we are looking for. + */ + if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce)) + return 0; + + /* + * If ce matches the file in the work tree, we can reuse it. + */ + if (ce_uptodate(ce) || + (!lstat(name, &st) && !ie_match_stat(istate, ce, &st, 0))) + return 1; + + return 0; +} + +static int diff_populate_gitlink(struct diff_filespec *s, int size_only) +{ + struct strbuf buf = STRBUF_INIT; + char *dirty = ""; + + /* Are we looking at the work tree? */ + if (s->dirty_submodule) + dirty = "-dirty"; + + strbuf_addf(&buf, "Subproject commit %s%s\n", + oid_to_hex(&s->oid), dirty); + s->size = buf.len; + if (size_only) { + s->data = NULL; + strbuf_release(&buf); + } else { + s->data = strbuf_detach(&buf, NULL); + s->should_free = 1; + } + return 0; +} + +/* + * While doing rename detection and pickaxe operation, we may need to + * grab the data for the blob (or file) for our own in-core comparison. + * diff_filespec has data and size fields for this purpose. + */ +int diff_populate_filespec(struct repository *r, + struct diff_filespec *s, + const struct diff_populate_filespec_options *options) +{ + int size_only = options ? options->check_size_only : 0; + int check_binary = options ? options->check_binary : 0; + int err = 0; + int conv_flags = global_conv_flags_eol; + /* + * demote FAIL to WARN to allow inspecting the situation + * instead of refusing. + */ + if (conv_flags & CONV_EOL_RNDTRP_DIE) + conv_flags = CONV_EOL_RNDTRP_WARN; + + if (!DIFF_FILE_VALID(s)) + die("internal error: asking to populate invalid file."); + if (S_ISDIR(s->mode)) + return -1; + + if (s->data) + return 0; + + if (size_only && 0 < s->size) + return 0; + + if (S_ISGITLINK(s->mode)) + return diff_populate_gitlink(s, size_only); + + if (!s->oid_valid || + reuse_worktree_file(r->index, s->path, &s->oid, 0)) { + struct strbuf buf = STRBUF_INIT; + struct stat st; + int fd; + + if (lstat(s->path, &st) < 0) { + err_empty: + err = -1; + empty: + s->data = (char *)""; + s->size = 0; + return err; + } + s->size = xsize_t(st.st_size); + if (!s->size) + goto empty; + if (S_ISLNK(st.st_mode)) { + struct strbuf sb = STRBUF_INIT; + + if (strbuf_readlink(&sb, s->path, s->size)) + goto err_empty; + s->size = sb.len; + s->data = strbuf_detach(&sb, NULL); + s->should_free = 1; + return 0; + } + + /* + * Even if the caller would be happy with getting + * only the size, we cannot return early at this + * point if the path requires us to run the content + * conversion. + */ + if (size_only && !would_convert_to_git(r->index, s->path)) + return 0; + + /* + * Note: this check uses xsize_t(st.st_size) that may + * not be the true size of the blob after it goes + * through convert_to_git(). This may not strictly be + * correct, but the whole point of big_file_threshold + * and is_binary check being that we want to avoid + * opening the file and inspecting the contents, this + * is probably fine. + */ + if (check_binary && + s->size > big_file_threshold && s->is_binary == -1) { + s->is_binary = 1; + return 0; + } + fd = open(s->path, O_RDONLY); + if (fd < 0) + goto err_empty; + s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0); + close(fd); + s->should_munmap = 1; + + /* + * Convert from working tree format to canonical git format + */ + if (convert_to_git(r->index, s->path, s->data, s->size, &buf, conv_flags)) { + size_t size = 0; + munmap(s->data, s->size); + s->should_munmap = 0; + s->data = strbuf_detach(&buf, &size); + s->size = size; + s->should_free = 1; + } + } + else { + struct object_info info = { + .sizep = &s->size + }; + + if (!(size_only || check_binary)) + /* + * Set contentp, since there is no chance that merely + * the size is sufficient. + */ + info.contentp = &s->data; + + if (options && options->missing_object_cb) { + if (!oid_object_info_extended(r, &s->oid, &info, + OBJECT_INFO_LOOKUP_REPLACE | + OBJECT_INFO_SKIP_FETCH_OBJECT)) + goto object_read; + options->missing_object_cb(options->missing_object_data); + } + if (oid_object_info_extended(r, &s->oid, &info, + OBJECT_INFO_LOOKUP_REPLACE)) + die("unable to read %s", oid_to_hex(&s->oid)); + +object_read: + if (size_only || check_binary) { + if (size_only) + return 0; + if (s->size > big_file_threshold && s->is_binary == -1) { + s->is_binary = 1; + return 0; + } + } + if (!info.contentp) { + info.contentp = &s->data; + if (oid_object_info_extended(r, &s->oid, &info, + OBJECT_INFO_LOOKUP_REPLACE)) + die("unable to read %s", oid_to_hex(&s->oid)); + } + s->should_free = 1; + } + return 0; +} + +void diff_free_filespec_blob(struct diff_filespec *s) +{ + if (s->should_free) + free(s->data); + else if (s->should_munmap) + munmap(s->data, s->size); + + if (s->should_free || s->should_munmap) { + s->should_free = s->should_munmap = 0; + s->data = NULL; + } +} + +void diff_free_filespec_data(struct diff_filespec *s) +{ + if (!s) + return; + + diff_free_filespec_blob(s); + FREE_AND_NULL(s->cnt_data); +} + +static void prep_temp_blob(struct index_state *istate, + const char *path, struct diff_tempfile *temp, + void *blob, + unsigned long size, + const struct object_id *oid, + int mode) +{ + struct strbuf buf = STRBUF_INIT; + char *path_dup = xstrdup(path); + const char *base = basename(path_dup); + struct checkout_metadata meta; + + init_checkout_metadata(&meta, NULL, NULL, oid); + + temp->tempfile = mks_tempfile_dt("git-blob-XXXXXX", base); + if (!temp->tempfile) + die_errno("unable to create temp-file"); + if (convert_to_working_tree(istate, path, + (const char *)blob, (size_t)size, &buf, &meta)) { + blob = buf.buf; + size = buf.len; + } + if (write_in_full(temp->tempfile->fd, blob, size) < 0 || + close_tempfile_gently(temp->tempfile)) + die_errno("unable to write temp-file"); + temp->name = get_tempfile_path(temp->tempfile); + oid_to_hex_r(temp->hex, oid); + xsnprintf(temp->mode, sizeof(temp->mode), "%06o", mode); + strbuf_release(&buf); + free(path_dup); +} + +static struct diff_tempfile *prepare_temp_file(struct repository *r, + struct diff_filespec *one) +{ + struct diff_tempfile *temp = claim_diff_tempfile(); + + if (!DIFF_FILE_VALID(one)) { + not_a_valid_file: + /* A '-' entry produces this for file-2, and + * a '+' entry produces this for file-1. + */ + temp->name = "/dev/null"; + xsnprintf(temp->hex, sizeof(temp->hex), "."); + xsnprintf(temp->mode, sizeof(temp->mode), "."); + return temp; + } + + if (!S_ISGITLINK(one->mode) && + (!one->oid_valid || + reuse_worktree_file(r->index, one->path, &one->oid, 1))) { + struct stat st; + if (lstat(one->path, &st) < 0) { + if (errno == ENOENT) + goto not_a_valid_file; + die_errno("stat(%s)", one->path); + } + if (S_ISLNK(st.st_mode)) { + struct strbuf sb = STRBUF_INIT; + if (strbuf_readlink(&sb, one->path, st.st_size) < 0) + die_errno("readlink(%s)", one->path); + prep_temp_blob(r->index, one->path, temp, sb.buf, sb.len, + (one->oid_valid ? + &one->oid : null_oid()), + (one->oid_valid ? + one->mode : S_IFLNK)); + strbuf_release(&sb); + } + else { + /* we can borrow from the file in the work tree */ + temp->name = one->path; + if (!one->oid_valid) + oid_to_hex_r(temp->hex, null_oid()); + else + oid_to_hex_r(temp->hex, &one->oid); + /* Even though we may sometimes borrow the + * contents from the work tree, we always want + * one->mode. mode is trustworthy even when + * !(one->oid_valid), as long as + * DIFF_FILE_VALID(one). + */ + xsnprintf(temp->mode, sizeof(temp->mode), "%06o", one->mode); + } + return temp; + } + else { + if (diff_populate_filespec(r, one, NULL)) + die("cannot read data blob for %s", one->path); + prep_temp_blob(r->index, one->path, temp, + one->data, one->size, + &one->oid, one->mode); + } + return temp; +} + +static void add_external_diff_name(struct repository *r, + struct strvec *argv, + struct diff_filespec *df) +{ + struct diff_tempfile *temp = prepare_temp_file(r, df); + strvec_push(argv, temp->name); + strvec_push(argv, temp->hex); + strvec_push(argv, temp->mode); +} + +/* An external diff command takes: + * + * diff-cmd name infile1 infile1-sha1 infile1-mode \ + * infile2 infile2-sha1 infile2-mode [ rename-to ] + * + */ +static void run_external_diff(const char *pgm, + const char *name, + const char *other, + struct diff_filespec *one, + struct diff_filespec *two, + const char *xfrm_msg, + struct diff_options *o) +{ + struct child_process cmd = CHILD_PROCESS_INIT; + struct diff_queue_struct *q = &diff_queued_diff; + + strvec_push(&cmd.args, pgm); + strvec_push(&cmd.args, name); + + if (one && two) { + add_external_diff_name(o->repo, &cmd.args, one); + add_external_diff_name(o->repo, &cmd.args, two); + if (other) { + strvec_push(&cmd.args, other); + strvec_push(&cmd.args, xfrm_msg); + } + } + + strvec_pushf(&cmd.env, "GIT_DIFF_PATH_COUNTER=%d", + ++o->diff_path_counter); + strvec_pushf(&cmd.env, "GIT_DIFF_PATH_TOTAL=%d", q->nr); + + diff_free_filespec_data(one); + diff_free_filespec_data(two); + cmd.use_shell = 1; + if (run_command(&cmd)) + die(_("external diff died, stopping at %s"), name); + + remove_tempfile(); +} + +static int similarity_index(struct diff_filepair *p) +{ + return p->score * 100 / MAX_SCORE; +} + +static const char *diff_abbrev_oid(const struct object_id *oid, int abbrev) +{ + if (startup_info->have_repository) + return repo_find_unique_abbrev(the_repository, oid, abbrev); + else { + char *hex = oid_to_hex(oid); + if (abbrev < 0) + abbrev = FALLBACK_DEFAULT_ABBREV; + if (abbrev > the_hash_algo->hexsz) + BUG("oid abbreviation out of range: %d", abbrev); + if (abbrev) + hex[abbrev] = '\0'; + return hex; + } +} + +static void fill_metainfo(struct strbuf *msg, + const char *name, + const char *other, + struct diff_filespec *one, + struct diff_filespec *two, + struct diff_options *o, + struct diff_filepair *p, + int *must_show_header, + int use_color) +{ + const char *set = diff_get_color(use_color, DIFF_METAINFO); + const char *reset = diff_get_color(use_color, DIFF_RESET); + const char *line_prefix = diff_line_prefix(o); + struct string_list *more_headers = NULL; + + *must_show_header = 1; + strbuf_init(msg, PATH_MAX * 2 + 300); + switch (p->status) { + case DIFF_STATUS_COPIED: + strbuf_addf(msg, "%s%ssimilarity index %d%%", + line_prefix, set, similarity_index(p)); + strbuf_addf(msg, "%s\n%s%scopy from ", + reset, line_prefix, set); + quote_c_style(name, msg, NULL, 0); + strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set); + quote_c_style(other, msg, NULL, 0); + strbuf_addf(msg, "%s\n", reset); + break; + case DIFF_STATUS_RENAMED: + strbuf_addf(msg, "%s%ssimilarity index %d%%", + line_prefix, set, similarity_index(p)); + strbuf_addf(msg, "%s\n%s%srename from ", + reset, line_prefix, set); + quote_c_style(name, msg, NULL, 0); + strbuf_addf(msg, "%s\n%s%srename to ", + reset, line_prefix, set); + quote_c_style(other, msg, NULL, 0); + strbuf_addf(msg, "%s\n", reset); + break; + case DIFF_STATUS_MODIFIED: + if (p->score) { + strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n", + line_prefix, + set, similarity_index(p), reset); + break; + } + /* fallthru */ + default: + *must_show_header = 0; + } + if ((more_headers = additional_headers(o, name))) { + add_formatted_headers(msg, more_headers, + line_prefix, set, reset); + *must_show_header = 1; + } + if (one && two && !oideq(&one->oid, &two->oid)) { + const unsigned hexsz = the_hash_algo->hexsz; + int abbrev = o->abbrev ? o->abbrev : DEFAULT_ABBREV; + + if (o->flags.full_index) + abbrev = hexsz; + + if (o->flags.binary) { + mmfile_t mf; + if ((!fill_mmfile(o->repo, &mf, one) && + diff_filespec_is_binary(o->repo, one)) || + (!fill_mmfile(o->repo, &mf, two) && + diff_filespec_is_binary(o->repo, two))) + abbrev = hexsz; + } + strbuf_addf(msg, "%s%sindex %s..%s", line_prefix, set, + diff_abbrev_oid(&one->oid, abbrev), + diff_abbrev_oid(&two->oid, abbrev)); + if (one->mode == two->mode) + strbuf_addf(msg, " %06o", one->mode); + strbuf_addf(msg, "%s\n", reset); + } +} + +static void run_diff_cmd(const char *pgm, + const char *name, + const char *other, + const char *attr_path, + struct diff_filespec *one, + struct diff_filespec *two, + struct strbuf *msg, + struct diff_options *o, + struct diff_filepair *p) +{ + const char *xfrm_msg = NULL; + int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score; + int must_show_header = 0; + struct userdiff_driver *drv = NULL; + + if (o->flags.allow_external || !o->ignore_driver_algorithm) + drv = userdiff_find_by_path(o->repo->index, attr_path); + + if (o->flags.allow_external && drv && drv->external) + pgm = drv->external; + + if (msg) { + /* + * don't use colors when the header is intended for an + * external diff driver + */ + fill_metainfo(msg, name, other, one, two, o, p, + &must_show_header, + want_color(o->use_color) && !pgm); + xfrm_msg = msg->len ? msg->buf : NULL; + } + + if (pgm) { + run_external_diff(pgm, name, other, one, two, xfrm_msg, o); + return; + } + if (one && two) { + if (!o->ignore_driver_algorithm && drv && drv->algorithm) + set_diff_algorithm(o, drv->algorithm); + + builtin_diff(name, other ? other : name, + one, two, xfrm_msg, must_show_header, + o, complete_rewrite); + } else { + fprintf(o->file, "* Unmerged path %s\n", name); + } +} + +static void diff_fill_oid_info(struct diff_filespec *one, struct index_state *istate) +{ + if (DIFF_FILE_VALID(one)) { + if (!one->oid_valid) { + struct stat st; + if (one->is_stdin) { + oidclr(&one->oid); + return; + } + if (lstat(one->path, &st) < 0) + die_errno("stat '%s'", one->path); + if (index_path(istate, &one->oid, one->path, &st, 0)) + die("cannot hash %s", one->path); + } + } + else + oidclr(&one->oid); +} + +static void strip_prefix(int prefix_length, const char **namep, const char **otherp) +{ + /* Strip the prefix but do not molest /dev/null and absolute paths */ + if (*namep && !is_absolute_path(*namep)) { + *namep += prefix_length; + if (**namep == '/') + ++*namep; + } + if (*otherp && !is_absolute_path(*otherp)) { + *otherp += prefix_length; + if (**otherp == '/') + ++*otherp; + } +} + +static void run_diff(struct diff_filepair *p, struct diff_options *o) +{ + const char *pgm = external_diff(); + struct strbuf msg; + struct diff_filespec *one = p->one; + struct diff_filespec *two = p->two; + const char *name; + const char *other; + const char *attr_path; + + name = one->path; + other = (strcmp(name, two->path) ? two->path : NULL); + attr_path = name; + if (o->prefix_length) + strip_prefix(o->prefix_length, &name, &other); + + if (!o->flags.allow_external) + pgm = NULL; + + if (DIFF_PAIR_UNMERGED(p)) { + run_diff_cmd(pgm, name, NULL, attr_path, + NULL, NULL, NULL, o, p); + return; + } + + diff_fill_oid_info(one, o->repo->index); + diff_fill_oid_info(two, o->repo->index); + + if (!pgm && + DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) && + (S_IFMT & one->mode) != (S_IFMT & two->mode)) { + /* + * a filepair that changes between file and symlink + * needs to be split into deletion and creation. + */ + struct diff_filespec *null = alloc_filespec(two->path); + run_diff_cmd(NULL, name, other, attr_path, + one, null, &msg, + o, p); + free(null); + strbuf_release(&msg); + + null = alloc_filespec(one->path); + run_diff_cmd(NULL, name, other, attr_path, + null, two, &msg, o, p); + free(null); + } + else + run_diff_cmd(pgm, name, other, attr_path, + one, two, &msg, o, p); + + strbuf_release(&msg); +} + +static void run_diffstat(struct diff_filepair *p, struct diff_options *o, + struct diffstat_t *diffstat) +{ + const char *name; + const char *other; + + if (!o->ignore_driver_algorithm) { + struct userdiff_driver *drv = userdiff_find_by_path(o->repo->index, + p->one->path); + + if (drv && drv->algorithm) + set_diff_algorithm(o, drv->algorithm); + } + + if (DIFF_PAIR_UNMERGED(p)) { + /* unmerged */ + builtin_diffstat(p->one->path, NULL, NULL, NULL, + diffstat, o, p); + return; + } + + name = p->one->path; + other = (strcmp(name, p->two->path) ? p->two->path : NULL); + + if (o->prefix_length) + strip_prefix(o->prefix_length, &name, &other); + + diff_fill_oid_info(p->one, o->repo->index); + diff_fill_oid_info(p->two, o->repo->index); + + builtin_diffstat(name, other, p->one, p->two, + diffstat, o, p); +} + +static void run_checkdiff(struct diff_filepair *p, struct diff_options *o) +{ + const char *name; + const char *other; + const char *attr_path; + + if (DIFF_PAIR_UNMERGED(p)) { + /* unmerged */ + return; + } + + name = p->one->path; + other = (strcmp(name, p->two->path) ? p->two->path : NULL); + attr_path = other ? other : name; + + if (o->prefix_length) + strip_prefix(o->prefix_length, &name, &other); + + diff_fill_oid_info(p->one, o->repo->index); + diff_fill_oid_info(p->two, o->repo->index); + + builtin_checkdiff(name, other, attr_path, p->one, p->two, o); +} + +void repo_diff_setup(struct repository *r, struct diff_options *options) +{ + memcpy(options, &default_diff_options, sizeof(*options)); + + options->file = stdout; + options->repo = r; + + options->output_indicators[OUTPUT_INDICATOR_NEW] = '+'; + options->output_indicators[OUTPUT_INDICATOR_OLD] = '-'; + options->output_indicators[OUTPUT_INDICATOR_CONTEXT] = ' '; + options->abbrev = DEFAULT_ABBREV; + options->line_termination = '\n'; + options->break_opt = -1; + options->rename_limit = -1; + options->dirstat_permille = diff_dirstat_permille_default; + options->context = diff_context_default; + options->interhunkcontext = diff_interhunk_context_default; + options->ws_error_highlight = ws_error_highlight_default; + options->flags.rename_empty = 1; + options->flags.relative_name = diff_relative; + options->objfind = NULL; + + /* pathchange left =NULL by default */ + options->change = diff_change; + options->add_remove = diff_addremove; + options->use_color = diff_use_color_default; + options->detect_rename = diff_detect_rename_default; + options->xdl_opts |= diff_algorithm; + if (diff_indent_heuristic) + DIFF_XDL_SET(options, INDENT_HEURISTIC); + + options->orderfile = diff_order_file_cfg; + + if (!options->flags.ignore_submodule_set) + options->flags.ignore_untracked_in_submodules = 1; + + if (diff_no_prefix) { + diff_set_noprefix(options); + } else if (!diff_mnemonic_prefix) { + diff_set_default_prefix(options); + } + + options->color_moved = diff_color_moved_default; + options->color_moved_ws_handling = diff_color_moved_ws_default; +} + +static const char diff_status_letters[] = { + DIFF_STATUS_ADDED, + DIFF_STATUS_COPIED, + DIFF_STATUS_DELETED, + DIFF_STATUS_MODIFIED, + DIFF_STATUS_RENAMED, + DIFF_STATUS_TYPE_CHANGED, + DIFF_STATUS_UNKNOWN, + DIFF_STATUS_UNMERGED, + DIFF_STATUS_FILTER_AON, + DIFF_STATUS_FILTER_BROKEN, + '\0', +}; + +static unsigned int filter_bit['Z' + 1]; + +static void prepare_filter_bits(void) +{ + int i; + + if (!filter_bit[DIFF_STATUS_ADDED]) { + for (i = 0; diff_status_letters[i]; i++) + filter_bit[(int) diff_status_letters[i]] = (1 << i); + } +} + +static unsigned filter_bit_tst(char status, const struct diff_options *opt) +{ + return opt->filter & filter_bit[(int) status]; +} + +unsigned diff_filter_bit(char status) +{ + prepare_filter_bits(); + return filter_bit[(int) status]; +} + +int diff_check_follow_pathspec(struct pathspec *ps, int die_on_error) +{ + unsigned forbidden_magic; + + if (ps->nr != 1) { + if (die_on_error) + die(_("--follow requires exactly one pathspec")); + return 0; + } + + forbidden_magic = ps->items[0].magic & ~(PATHSPEC_FROMTOP | + PATHSPEC_LITERAL); + if (forbidden_magic) { + if (die_on_error) { + struct strbuf sb = STRBUF_INIT; + pathspec_magic_names(forbidden_magic, &sb); + die(_("pathspec magic not supported by --follow: %s"), + sb.buf); + } + return 0; + } + + return 1; +} + +void diff_setup_done(struct diff_options *options) +{ + unsigned check_mask = DIFF_FORMAT_NAME | + DIFF_FORMAT_NAME_STATUS | + DIFF_FORMAT_CHECKDIFF | + DIFF_FORMAT_NO_OUTPUT; + /* + * This must be signed because we're comparing against a potentially + * negative value. + */ + const int hexsz = the_hash_algo->hexsz; + + if (options->set_default) + options->set_default(options); + + if (HAS_MULTI_BITS(options->output_format & check_mask)) + die(_("options '%s', '%s', '%s', and '%s' cannot be used together"), + "--name-only", "--name-status", "--check", "-s"); + + if (HAS_MULTI_BITS(options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK)) + die(_("options '%s', '%s', and '%s' cannot be used together"), + "-G", "-S", "--find-object"); + + if (HAS_MULTI_BITS(options->pickaxe_opts & DIFF_PICKAXE_KINDS_G_REGEX_MASK)) + die(_("options '%s' and '%s' cannot be used together, use '%s' with '%s'"), + "-G", "--pickaxe-regex", "--pickaxe-regex", "-S"); + + if (HAS_MULTI_BITS(options->pickaxe_opts & DIFF_PICKAXE_KINDS_ALL_OBJFIND_MASK)) + die(_("options '%s' and '%s' cannot be used together, use '%s' with '%s' and '%s'"), + "--pickaxe-all", "--find-object", "--pickaxe-all", "-G", "-S"); + + /* + * Most of the time we can say "there are changes" + * only by checking if there are changed paths, but + * --ignore-whitespace* options force us to look + * inside contents. + */ + + if ((options->xdl_opts & XDF_WHITESPACE_FLAGS) || + options->ignore_regex_nr) + options->flags.diff_from_contents = 1; + else + options->flags.diff_from_contents = 0; + + if (options->flags.find_copies_harder) + options->detect_rename = DIFF_DETECT_COPY; + + if (!options->flags.relative_name) + options->prefix = NULL; + if (options->prefix) + options->prefix_length = strlen(options->prefix); + else + options->prefix_length = 0; + + /* + * --name-only, --name-status, --checkdiff, and -s + * turn other output format off. + */ + if (options->output_format & (DIFF_FORMAT_NAME | + DIFF_FORMAT_NAME_STATUS | + DIFF_FORMAT_CHECKDIFF | + DIFF_FORMAT_NO_OUTPUT)) + options->output_format &= ~(DIFF_FORMAT_RAW | + DIFF_FORMAT_NUMSTAT | + DIFF_FORMAT_DIFFSTAT | + DIFF_FORMAT_SHORTSTAT | + DIFF_FORMAT_DIRSTAT | + DIFF_FORMAT_SUMMARY | + DIFF_FORMAT_PATCH); + + /* + * These cases always need recursive; we do not drop caller-supplied + * recursive bits for other formats here. + */ + if (options->output_format & (DIFF_FORMAT_PATCH | + DIFF_FORMAT_NUMSTAT | + DIFF_FORMAT_DIFFSTAT | + DIFF_FORMAT_SHORTSTAT | + DIFF_FORMAT_DIRSTAT | + DIFF_FORMAT_SUMMARY | + DIFF_FORMAT_CHECKDIFF)) + options->flags.recursive = 1; + /* + * Also pickaxe would not work very well if you do not say recursive + */ + if (options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK) + options->flags.recursive = 1; + /* + * When patches are generated, submodules diffed against the work tree + * must be checked for dirtiness too so it can be shown in the output + */ + if (options->output_format & DIFF_FORMAT_PATCH) + options->flags.dirty_submodules = 1; + + if (options->detect_rename && options->rename_limit < 0) + options->rename_limit = diff_rename_limit_default; + if (hexsz < options->abbrev) + options->abbrev = hexsz; /* full */ + + /* + * It does not make sense to show the first hit we happened + * to have found. It does not make sense not to return with + * exit code in such a case either. + */ + if (options->flags.quick) { + options->output_format = DIFF_FORMAT_NO_OUTPUT; + options->flags.exit_with_status = 1; + } + + options->diff_path_counter = 0; + + if (options->flags.follow_renames) + diff_check_follow_pathspec(&options->pathspec, 1); + + if (!options->use_color || external_diff()) + options->color_moved = 0; + + if (options->filter_not) { + if (!options->filter) + options->filter = ~filter_bit[DIFF_STATUS_FILTER_AON]; + options->filter &= ~options->filter_not; + } +} + +int parse_long_opt(const char *opt, const char **argv, + const char **optarg) +{ + const char *arg = argv[0]; + if (!skip_prefix(arg, "--", &arg)) + return 0; + if (!skip_prefix(arg, opt, &arg)) + return 0; + if (*arg == '=') { /* stuck form: --option=value */ + *optarg = arg + 1; + return 1; + } + if (*arg != '\0') + return 0; + /* separate form: --option value */ + if (!argv[1]) + die("Option '--%s' requires a value", opt); + *optarg = argv[1]; + return 2; +} + +static int diff_opt_stat(const struct option *opt, const char *value, int unset) +{ + struct diff_options *options = opt->value; + int width = options->stat_width; + int name_width = options->stat_name_width; + int graph_width = options->stat_graph_width; + int count = options->stat_count; + char *end; + + BUG_ON_OPT_NEG(unset); + + if (!strcmp(opt->long_name, "stat")) { + if (value) { + width = strtoul(value, &end, 10); + if (*end == ',') + name_width = strtoul(end+1, &end, 10); + if (*end == ',') + count = strtoul(end+1, &end, 10); + if (*end) + return error(_("invalid --stat value: %s"), value); + } + } else if (!strcmp(opt->long_name, "stat-width")) { + width = strtoul(value, &end, 10); + if (*end) + return error(_("%s expects a numerical value"), + opt->long_name); + } else if (!strcmp(opt->long_name, "stat-name-width")) { + name_width = strtoul(value, &end, 10); + if (*end) + return error(_("%s expects a numerical value"), + opt->long_name); + } else if (!strcmp(opt->long_name, "stat-graph-width")) { + graph_width = strtoul(value, &end, 10); + if (*end) + return error(_("%s expects a numerical value"), + opt->long_name); + } else if (!strcmp(opt->long_name, "stat-count")) { + count = strtoul(value, &end, 10); + if (*end) + return error(_("%s expects a numerical value"), + opt->long_name); + } else + BUG("%s should not get here", opt->long_name); + + options->output_format &= ~DIFF_FORMAT_NO_OUTPUT; + options->output_format |= DIFF_FORMAT_DIFFSTAT; + options->stat_name_width = name_width; + options->stat_graph_width = graph_width; + options->stat_width = width; + options->stat_count = count; + return 0; +} + +static int parse_dirstat_opt(struct diff_options *options, const char *params) +{ + struct strbuf errmsg = STRBUF_INIT; + if (parse_dirstat_params(options, params, &errmsg)) + die(_("Failed to parse --dirstat/-X option parameter:\n%s"), + errmsg.buf); + strbuf_release(&errmsg); + /* + * The caller knows a dirstat-related option is given from the command + * line; allow it to say "return this_function();" + */ + options->output_format &= ~DIFF_FORMAT_NO_OUTPUT; + options->output_format |= DIFF_FORMAT_DIRSTAT; + return 1; +} + +static int diff_opt_diff_filter(const struct option *option, + const char *optarg, int unset) +{ + struct diff_options *opt = option->value; + int i, optch; + + BUG_ON_OPT_NEG(unset); + prepare_filter_bits(); + + for (i = 0; (optch = optarg[i]) != '\0'; i++) { + unsigned int bit; + int negate; + + if ('a' <= optch && optch <= 'z') { + negate = 1; + optch = toupper(optch); + } else { + negate = 0; + } + + bit = (0 <= optch && optch <= 'Z') ? filter_bit[optch] : 0; + if (!bit) + return error(_("unknown change class '%c' in --diff-filter=%s"), + optarg[i], optarg); + if (negate) + opt->filter_not |= bit; + else + opt->filter |= bit; + } + return 0; +} + +static void enable_patch_output(int *fmt) +{ + *fmt &= ~DIFF_FORMAT_NO_OUTPUT; + *fmt |= DIFF_FORMAT_PATCH; +} + +static int diff_opt_ws_error_highlight(const struct option *option, + const char *arg, int unset) +{ + struct diff_options *opt = option->value; + int val = parse_ws_error_highlight(arg); + + BUG_ON_OPT_NEG(unset); + if (val < 0) + return error(_("unknown value after ws-error-highlight=%.*s"), + -1 - val, arg); + opt->ws_error_highlight = val; + return 0; +} + +static int diff_opt_find_object(const struct option *option, + const char *arg, int unset) +{ + struct diff_options *opt = option->value; + struct object_id oid; + + BUG_ON_OPT_NEG(unset); + if (repo_get_oid(the_repository, arg, &oid)) + return error(_("unable to resolve '%s'"), arg); + + if (!opt->objfind) + CALLOC_ARRAY(opt->objfind, 1); + + opt->pickaxe_opts |= DIFF_PICKAXE_KIND_OBJFIND; + opt->flags.recursive = 1; + opt->flags.tree_in_recursive = 1; + oidset_insert(opt->objfind, &oid); + return 0; +} + +static int diff_opt_anchored(const struct option *opt, + const char *arg, int unset) +{ + struct diff_options *options = opt->value; + + BUG_ON_OPT_NEG(unset); + options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF); + ALLOC_GROW(options->anchors, options->anchors_nr + 1, + options->anchors_alloc); + options->anchors[options->anchors_nr++] = xstrdup(arg); + return 0; +} + +static int diff_opt_binary(const struct option *opt, + const char *arg, int unset) +{ + struct diff_options *options = opt->value; + + BUG_ON_OPT_NEG(unset); + BUG_ON_OPT_ARG(arg); + enable_patch_output(&options->output_format); + options->flags.binary = 1; + return 0; +} + +static int diff_opt_break_rewrites(const struct option *opt, + const char *arg, int unset) +{ + int *break_opt = opt->value; + int opt1, opt2; + + BUG_ON_OPT_NEG(unset); + if (!arg) + arg = ""; + opt1 = parse_rename_score(&arg); + if (*arg == 0) + opt2 = 0; + else if (*arg != '/') + return error(_("%s expects <n>/<m> form"), opt->long_name); + else { + arg++; + opt2 = parse_rename_score(&arg); + } + if (*arg != 0) + return error(_("%s expects <n>/<m> form"), opt->long_name); + *break_opt = opt1 | (opt2 << 16); + return 0; +} + +static int diff_opt_char(const struct option *opt, + const char *arg, int unset) +{ + char *value = opt->value; + + BUG_ON_OPT_NEG(unset); + if (arg[1]) + return error(_("%s expects a character, got '%s'"), + opt->long_name, arg); + *value = arg[0]; + return 0; +} + +static int diff_opt_color_moved(const struct option *opt, + const char *arg, int unset) +{ + struct diff_options *options = opt->value; + + if (unset) { + options->color_moved = COLOR_MOVED_NO; + } else if (!arg) { + if (diff_color_moved_default) + options->color_moved = diff_color_moved_default; + if (options->color_moved == COLOR_MOVED_NO) + options->color_moved = COLOR_MOVED_DEFAULT; + } else { + int cm = parse_color_moved(arg); + if (cm < 0) + return error(_("bad --color-moved argument: %s"), arg); + options->color_moved = cm; + } + return 0; +} + +static int diff_opt_color_moved_ws(const struct option *opt, + const char *arg, int unset) +{ + struct diff_options *options = opt->value; + unsigned cm; + + if (unset) { + options->color_moved_ws_handling = 0; + return 0; + } + + cm = parse_color_moved_ws(arg); + if (cm & COLOR_MOVED_WS_ERROR) + return error(_("invalid mode '%s' in --color-moved-ws"), arg); + options->color_moved_ws_handling = cm; + return 0; +} + +static int diff_opt_color_words(const struct option *opt, + const char *arg, int unset) +{ + struct diff_options *options = opt->value; + + BUG_ON_OPT_NEG(unset); + options->use_color = 1; + options->word_diff = DIFF_WORDS_COLOR; + options->word_regex = arg; + return 0; +} + +static int diff_opt_compact_summary(const struct option *opt, + const char *arg, int unset) +{ + struct diff_options *options = opt->value; + + BUG_ON_OPT_ARG(arg); + if (unset) { + options->flags.stat_with_summary = 0; + } else { + options->flags.stat_with_summary = 1; + options->output_format &= ~DIFF_FORMAT_NO_OUTPUT; + options->output_format |= DIFF_FORMAT_DIFFSTAT; + } + return 0; +} + +static int diff_opt_diff_algorithm(const struct option *opt, + const char *arg, int unset) +{ + struct diff_options *options = opt->value; + + BUG_ON_OPT_NEG(unset); + + if (set_diff_algorithm(options, arg)) + return error(_("option diff-algorithm accepts \"myers\", " + "\"minimal\", \"patience\" and \"histogram\"")); + + options->ignore_driver_algorithm = 1; + + return 0; +} + +static int diff_opt_diff_algorithm_no_arg(const struct option *opt, + const char *arg, int unset) +{ + struct diff_options *options = opt->value; + + BUG_ON_OPT_NEG(unset); + BUG_ON_OPT_ARG(arg); + + if (set_diff_algorithm(options, opt->long_name)) + BUG("available diff algorithms include \"myers\", " + "\"minimal\", \"patience\" and \"histogram\""); + + options->ignore_driver_algorithm = 1; + + return 0; +} + +static int diff_opt_dirstat(const struct option *opt, + const char *arg, int unset) +{ + struct diff_options *options = opt->value; + + BUG_ON_OPT_NEG(unset); + if (!strcmp(opt->long_name, "cumulative")) { + if (arg) + BUG("how come --cumulative take a value?"); + arg = "cumulative"; + } else if (!strcmp(opt->long_name, "dirstat-by-file")) + parse_dirstat_opt(options, "files"); + parse_dirstat_opt(options, arg ? arg : ""); + return 0; +} + +static int diff_opt_find_copies(const struct option *opt, + const char *arg, int unset) +{ + struct diff_options *options = opt->value; + + BUG_ON_OPT_NEG(unset); + if (!arg) + arg = ""; + options->rename_score = parse_rename_score(&arg); + if (*arg != 0) + return error(_("invalid argument to %s"), opt->long_name); + + if (options->detect_rename == DIFF_DETECT_COPY) + options->flags.find_copies_harder = 1; + else + options->detect_rename = DIFF_DETECT_COPY; + + return 0; +} + +static int diff_opt_find_renames(const struct option *opt, + const char *arg, int unset) +{ + struct diff_options *options = opt->value; + + BUG_ON_OPT_NEG(unset); + if (!arg) + arg = ""; + options->rename_score = parse_rename_score(&arg); + if (*arg != 0) + return error(_("invalid argument to %s"), opt->long_name); + + options->detect_rename = DIFF_DETECT_RENAME; + return 0; +} + +static int diff_opt_follow(const struct option *opt, + const char *arg, int unset) +{ + struct diff_options *options = opt->value; + + BUG_ON_OPT_ARG(arg); + if (unset) { + options->flags.follow_renames = 0; + options->flags.default_follow_renames = 0; + } else { + options->flags.follow_renames = 1; + } + return 0; +} + +static int diff_opt_ignore_submodules(const struct option *opt, + const char *arg, int unset) +{ + struct diff_options *options = opt->value; + + BUG_ON_OPT_NEG(unset); + if (!arg) + arg = "all"; + options->flags.override_submodule_config = 1; + handle_ignore_submodules_arg(options, arg); + return 0; +} + +static int diff_opt_line_prefix(const struct option *opt, + const char *optarg, int unset) +{ + struct diff_options *options = opt->value; + + BUG_ON_OPT_NEG(unset); + options->line_prefix = optarg; + options->line_prefix_length = strlen(options->line_prefix); + graph_setup_line_prefix(options); + return 0; +} + +static int diff_opt_no_prefix(const struct option *opt, + const char *optarg, int unset) +{ + struct diff_options *options = opt->value; + + BUG_ON_OPT_NEG(unset); + BUG_ON_OPT_ARG(optarg); + diff_set_noprefix(options); + return 0; +} + +static int diff_opt_default_prefix(const struct option *opt, + const char *optarg, int unset) +{ + struct diff_options *options = opt->value; + + BUG_ON_OPT_NEG(unset); + BUG_ON_OPT_ARG(optarg); + diff_set_default_prefix(options); + return 0; +} + +static enum parse_opt_result diff_opt_output(struct parse_opt_ctx_t *ctx, + const struct option *opt, + const char *arg, int unset) +{ + struct diff_options *options = opt->value; + char *path; + + BUG_ON_OPT_NEG(unset); + path = prefix_filename(ctx->prefix, arg); + options->file = xfopen(path, "w"); + options->close_file = 1; + if (options->use_color != GIT_COLOR_ALWAYS) + options->use_color = GIT_COLOR_NEVER; + free(path); + return 0; +} + +static int diff_opt_patience(const struct option *opt, + const char *arg, int unset) +{ + struct diff_options *options = opt->value; + int i; + + BUG_ON_OPT_NEG(unset); + BUG_ON_OPT_ARG(arg); + /* + * Both --patience and --anchored use PATIENCE_DIFF + * internally, so remove any anchors previously + * specified. + */ + for (i = 0; i < options->anchors_nr; i++) + free(options->anchors[i]); + options->anchors_nr = 0; + options->ignore_driver_algorithm = 1; + + return set_diff_algorithm(options, "patience"); +} + +static int diff_opt_ignore_regex(const struct option *opt, + const char *arg, int unset) +{ + struct diff_options *options = opt->value; + regex_t *regex; + + BUG_ON_OPT_NEG(unset); + regex = xmalloc(sizeof(*regex)); + if (regcomp(regex, arg, REG_EXTENDED | REG_NEWLINE)) + return error(_("invalid regex given to -I: '%s'"), arg); + ALLOC_GROW(options->ignore_regex, options->ignore_regex_nr + 1, + options->ignore_regex_alloc); + options->ignore_regex[options->ignore_regex_nr++] = regex; + return 0; +} + +static int diff_opt_pickaxe_regex(const struct option *opt, + const char *arg, int unset) +{ + struct diff_options *options = opt->value; + + BUG_ON_OPT_NEG(unset); + options->pickaxe = arg; + options->pickaxe_opts |= DIFF_PICKAXE_KIND_G; + return 0; +} + +static int diff_opt_pickaxe_string(const struct option *opt, + const char *arg, int unset) +{ + struct diff_options *options = opt->value; + + BUG_ON_OPT_NEG(unset); + options->pickaxe = arg; + options->pickaxe_opts |= DIFF_PICKAXE_KIND_S; + return 0; +} + +static int diff_opt_relative(const struct option *opt, + const char *arg, int unset) +{ + struct diff_options *options = opt->value; + + options->flags.relative_name = !unset; + if (arg) + options->prefix = arg; + return 0; +} + +static int diff_opt_submodule(const struct option *opt, + const char *arg, int unset) +{ + struct diff_options *options = opt->value; + + BUG_ON_OPT_NEG(unset); + if (!arg) + arg = "log"; + if (parse_submodule_params(options, arg)) + return error(_("failed to parse --submodule option parameter: '%s'"), + arg); + return 0; +} + +static int diff_opt_textconv(const struct option *opt, + const char *arg, int unset) +{ + struct diff_options *options = opt->value; + + BUG_ON_OPT_ARG(arg); + if (unset) { + options->flags.allow_textconv = 0; + } else { + options->flags.allow_textconv = 1; + options->flags.textconv_set_via_cmdline = 1; + } + return 0; +} + +static int diff_opt_unified(const struct option *opt, + const char *arg, int unset) +{ + struct diff_options *options = opt->value; + char *s; + + BUG_ON_OPT_NEG(unset); + + if (arg) { + options->context = strtol(arg, &s, 10); + if (*s) + return error(_("%s expects a numerical value"), "--unified"); + } + enable_patch_output(&options->output_format); + + return 0; +} + +static int diff_opt_word_diff(const struct option *opt, + const char *arg, int unset) +{ + struct diff_options *options = opt->value; + + BUG_ON_OPT_NEG(unset); + if (arg) { + if (!strcmp(arg, "plain")) + options->word_diff = DIFF_WORDS_PLAIN; + else if (!strcmp(arg, "color")) { + options->use_color = 1; + options->word_diff = DIFF_WORDS_COLOR; + } + else if (!strcmp(arg, "porcelain")) + options->word_diff = DIFF_WORDS_PORCELAIN; + else if (!strcmp(arg, "none")) + options->word_diff = DIFF_WORDS_NONE; + else + return error(_("bad --word-diff argument: %s"), arg); + } else { + if (options->word_diff == DIFF_WORDS_NONE) + options->word_diff = DIFF_WORDS_PLAIN; + } + return 0; +} + +static int diff_opt_word_diff_regex(const struct option *opt, + const char *arg, int unset) +{ + struct diff_options *options = opt->value; + + BUG_ON_OPT_NEG(unset); + if (options->word_diff == DIFF_WORDS_NONE) + options->word_diff = DIFF_WORDS_PLAIN; + options->word_regex = arg; + return 0; +} + +static int diff_opt_rotate_to(const struct option *opt, const char *arg, int unset) +{ + struct diff_options *options = opt->value; + + BUG_ON_OPT_NEG(unset); + if (!strcmp(opt->long_name, "skip-to")) + options->skip_instead_of_rotate = 1; + else + options->skip_instead_of_rotate = 0; + options->rotate_to = arg; + return 0; +} + +/* + * Consider adding new flags to __git_diff_common_options + * in contrib/completion/git-completion.bash + */ +struct option *add_diff_options(const struct option *opts, + struct diff_options *options) +{ + struct option parseopts[] = { + OPT_GROUP(N_("Diff output format options")), + OPT_BITOP('p', "patch", &options->output_format, + N_("generate patch"), + DIFF_FORMAT_PATCH, DIFF_FORMAT_NO_OUTPUT), + OPT_SET_INT('s', "no-patch", &options->output_format, + N_("suppress diff output"), DIFF_FORMAT_NO_OUTPUT), + OPT_BITOP('u', NULL, &options->output_format, + N_("generate patch"), + DIFF_FORMAT_PATCH, DIFF_FORMAT_NO_OUTPUT), + OPT_CALLBACK_F('U', "unified", options, N_("<n>"), + N_("generate diffs with <n> lines context"), + PARSE_OPT_NONEG | PARSE_OPT_OPTARG, diff_opt_unified), + OPT_BOOL('W', "function-context", &options->flags.funccontext, + N_("generate diffs with <n> lines context")), + OPT_BITOP(0, "raw", &options->output_format, + N_("generate the diff in raw format"), + DIFF_FORMAT_RAW, DIFF_FORMAT_NO_OUTPUT), + OPT_BITOP(0, "patch-with-raw", &options->output_format, + N_("synonym for '-p --raw'"), + DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW, + DIFF_FORMAT_NO_OUTPUT), + OPT_BITOP(0, "patch-with-stat", &options->output_format, + N_("synonym for '-p --stat'"), + DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT, + DIFF_FORMAT_NO_OUTPUT), + OPT_BITOP(0, "numstat", &options->output_format, + N_("machine friendly --stat"), + DIFF_FORMAT_NUMSTAT, DIFF_FORMAT_NO_OUTPUT), + OPT_BITOP(0, "shortstat", &options->output_format, + N_("output only the last line of --stat"), + DIFF_FORMAT_SHORTSTAT, DIFF_FORMAT_NO_OUTPUT), + OPT_CALLBACK_F('X', "dirstat", options, N_("<param1,param2>..."), + N_("output the distribution of relative amount of changes for each sub-directory"), + PARSE_OPT_NONEG | PARSE_OPT_OPTARG, + diff_opt_dirstat), + OPT_CALLBACK_F(0, "cumulative", options, NULL, + N_("synonym for --dirstat=cumulative"), + PARSE_OPT_NONEG | PARSE_OPT_NOARG, + diff_opt_dirstat), + OPT_CALLBACK_F(0, "dirstat-by-file", options, N_("<param1,param2>..."), + N_("synonym for --dirstat=files,param1,param2..."), + PARSE_OPT_NONEG | PARSE_OPT_OPTARG, + diff_opt_dirstat), + OPT_BIT_F(0, "check", &options->output_format, + N_("warn if changes introduce conflict markers or whitespace errors"), + DIFF_FORMAT_CHECKDIFF, PARSE_OPT_NONEG), + OPT_BITOP(0, "summary", &options->output_format, + N_("condensed summary such as creations, renames and mode changes"), + DIFF_FORMAT_SUMMARY, DIFF_FORMAT_NO_OUTPUT), + OPT_BIT_F(0, "name-only", &options->output_format, + N_("show only names of changed files"), + DIFF_FORMAT_NAME, PARSE_OPT_NONEG), + OPT_BIT_F(0, "name-status", &options->output_format, + N_("show only names and status of changed files"), + DIFF_FORMAT_NAME_STATUS, PARSE_OPT_NONEG), + OPT_CALLBACK_F(0, "stat", options, N_("<width>[,<name-width>[,<count>]]"), + N_("generate diffstat"), + PARSE_OPT_NONEG | PARSE_OPT_OPTARG, diff_opt_stat), + OPT_CALLBACK_F(0, "stat-width", options, N_("<width>"), + N_("generate diffstat with a given width"), + PARSE_OPT_NONEG, diff_opt_stat), + OPT_CALLBACK_F(0, "stat-name-width", options, N_("<width>"), + N_("generate diffstat with a given name width"), + PARSE_OPT_NONEG, diff_opt_stat), + OPT_CALLBACK_F(0, "stat-graph-width", options, N_("<width>"), + N_("generate diffstat with a given graph width"), + PARSE_OPT_NONEG, diff_opt_stat), + OPT_CALLBACK_F(0, "stat-count", options, N_("<count>"), + N_("generate diffstat with limited lines"), + PARSE_OPT_NONEG, diff_opt_stat), + OPT_CALLBACK_F(0, "compact-summary", options, NULL, + N_("generate compact summary in diffstat"), + PARSE_OPT_NOARG, diff_opt_compact_summary), + OPT_CALLBACK_F(0, "binary", options, NULL, + N_("output a binary diff that can be applied"), + PARSE_OPT_NONEG | PARSE_OPT_NOARG, diff_opt_binary), + OPT_BOOL(0, "full-index", &options->flags.full_index, + N_("show full pre- and post-image object names on the \"index\" lines")), + OPT_COLOR_FLAG(0, "color", &options->use_color, + N_("show colored diff")), + OPT_CALLBACK_F(0, "ws-error-highlight", options, N_("<kind>"), + N_("highlight whitespace errors in the 'context', 'old' or 'new' lines in the diff"), + PARSE_OPT_NONEG, diff_opt_ws_error_highlight), + OPT_SET_INT('z', NULL, &options->line_termination, + N_("do not munge pathnames and use NULs as output field terminators in --raw or --numstat"), + 0), + OPT__ABBREV(&options->abbrev), + OPT_STRING_F(0, "src-prefix", &options->a_prefix, N_("<prefix>"), + N_("show the given source prefix instead of \"a/\""), + PARSE_OPT_NONEG), + OPT_STRING_F(0, "dst-prefix", &options->b_prefix, N_("<prefix>"), + N_("show the given destination prefix instead of \"b/\""), + PARSE_OPT_NONEG), + OPT_CALLBACK_F(0, "line-prefix", options, N_("<prefix>"), + N_("prepend an additional prefix to every line of output"), + PARSE_OPT_NONEG, diff_opt_line_prefix), + OPT_CALLBACK_F(0, "no-prefix", options, NULL, + N_("do not show any source or destination prefix"), + PARSE_OPT_NONEG | PARSE_OPT_NOARG, diff_opt_no_prefix), + OPT_CALLBACK_F(0, "default-prefix", options, NULL, + N_("use default prefixes a/ and b/"), + PARSE_OPT_NONEG | PARSE_OPT_NOARG, diff_opt_default_prefix), + OPT_INTEGER_F(0, "inter-hunk-context", &options->interhunkcontext, + N_("show context between diff hunks up to the specified number of lines"), + PARSE_OPT_NONEG), + OPT_CALLBACK_F(0, "output-indicator-new", + &options->output_indicators[OUTPUT_INDICATOR_NEW], + N_("<char>"), + N_("specify the character to indicate a new line instead of '+'"), + PARSE_OPT_NONEG, diff_opt_char), + OPT_CALLBACK_F(0, "output-indicator-old", + &options->output_indicators[OUTPUT_INDICATOR_OLD], + N_("<char>"), + N_("specify the character to indicate an old line instead of '-'"), + PARSE_OPT_NONEG, diff_opt_char), + OPT_CALLBACK_F(0, "output-indicator-context", + &options->output_indicators[OUTPUT_INDICATOR_CONTEXT], + N_("<char>"), + N_("specify the character to indicate a context instead of ' '"), + PARSE_OPT_NONEG, diff_opt_char), + + OPT_GROUP(N_("Diff rename options")), + OPT_CALLBACK_F('B', "break-rewrites", &options->break_opt, N_("<n>[/<m>]"), + N_("break complete rewrite changes into pairs of delete and create"), + PARSE_OPT_NONEG | PARSE_OPT_OPTARG, + diff_opt_break_rewrites), + OPT_CALLBACK_F('M', "find-renames", options, N_("<n>"), + N_("detect renames"), + PARSE_OPT_NONEG | PARSE_OPT_OPTARG, + diff_opt_find_renames), + OPT_SET_INT_F('D', "irreversible-delete", &options->irreversible_delete, + N_("omit the preimage for deletes"), + 1, PARSE_OPT_NONEG), + OPT_CALLBACK_F('C', "find-copies", options, N_("<n>"), + N_("detect copies"), + PARSE_OPT_NONEG | PARSE_OPT_OPTARG, + diff_opt_find_copies), + OPT_BOOL(0, "find-copies-harder", &options->flags.find_copies_harder, + N_("use unmodified files as source to find copies")), + OPT_SET_INT_F(0, "no-renames", &options->detect_rename, + N_("disable rename detection"), + 0, PARSE_OPT_NONEG), + OPT_BOOL(0, "rename-empty", &options->flags.rename_empty, + N_("use empty blobs as rename source")), + OPT_CALLBACK_F(0, "follow", options, NULL, + N_("continue listing the history of a file beyond renames"), + PARSE_OPT_NOARG, diff_opt_follow), + OPT_INTEGER('l', NULL, &options->rename_limit, + N_("prevent rename/copy detection if the number of rename/copy targets exceeds given limit")), + + OPT_GROUP(N_("Diff algorithm options")), + OPT_CALLBACK_F(0, "minimal", options, NULL, + N_("produce the smallest possible diff"), + PARSE_OPT_NONEG | PARSE_OPT_NOARG, + diff_opt_diff_algorithm_no_arg), + OPT_BIT_F('w', "ignore-all-space", &options->xdl_opts, + N_("ignore whitespace when comparing lines"), + XDF_IGNORE_WHITESPACE, PARSE_OPT_NONEG), + OPT_BIT_F('b', "ignore-space-change", &options->xdl_opts, + N_("ignore changes in amount of whitespace"), + XDF_IGNORE_WHITESPACE_CHANGE, PARSE_OPT_NONEG), + OPT_BIT_F(0, "ignore-space-at-eol", &options->xdl_opts, + N_("ignore changes in whitespace at EOL"), + XDF_IGNORE_WHITESPACE_AT_EOL, PARSE_OPT_NONEG), + OPT_BIT_F(0, "ignore-cr-at-eol", &options->xdl_opts, + N_("ignore carrier-return at the end of line"), + XDF_IGNORE_CR_AT_EOL, PARSE_OPT_NONEG), + OPT_BIT_F(0, "ignore-blank-lines", &options->xdl_opts, + N_("ignore changes whose lines are all blank"), + XDF_IGNORE_BLANK_LINES, PARSE_OPT_NONEG), + OPT_CALLBACK_F('I', "ignore-matching-lines", options, N_("<regex>"), + N_("ignore changes whose all lines match <regex>"), + 0, diff_opt_ignore_regex), + OPT_BIT(0, "indent-heuristic", &options->xdl_opts, + N_("heuristic to shift diff hunk boundaries for easy reading"), + XDF_INDENT_HEURISTIC), + OPT_CALLBACK_F(0, "patience", options, NULL, + N_("generate diff using the \"patience diff\" algorithm"), + PARSE_OPT_NONEG | PARSE_OPT_NOARG, + diff_opt_patience), + OPT_CALLBACK_F(0, "histogram", options, NULL, + N_("generate diff using the \"histogram diff\" algorithm"), + PARSE_OPT_NONEG | PARSE_OPT_NOARG, + diff_opt_diff_algorithm_no_arg), + OPT_CALLBACK_F(0, "diff-algorithm", options, N_("<algorithm>"), + N_("choose a diff algorithm"), + PARSE_OPT_NONEG, diff_opt_diff_algorithm), + OPT_CALLBACK_F(0, "anchored", options, N_("<text>"), + N_("generate diff using the \"anchored diff\" algorithm"), + PARSE_OPT_NONEG, diff_opt_anchored), + OPT_CALLBACK_F(0, "word-diff", options, N_("<mode>"), + N_("show word diff, using <mode> to delimit changed words"), + PARSE_OPT_NONEG | PARSE_OPT_OPTARG, diff_opt_word_diff), + OPT_CALLBACK_F(0, "word-diff-regex", options, N_("<regex>"), + N_("use <regex> to decide what a word is"), + PARSE_OPT_NONEG, diff_opt_word_diff_regex), + OPT_CALLBACK_F(0, "color-words", options, N_("<regex>"), + N_("equivalent to --word-diff=color --word-diff-regex=<regex>"), + PARSE_OPT_NONEG | PARSE_OPT_OPTARG, diff_opt_color_words), + OPT_CALLBACK_F(0, "color-moved", options, N_("<mode>"), + N_("moved lines of code are colored differently"), + PARSE_OPT_OPTARG, diff_opt_color_moved), + OPT_CALLBACK_F(0, "color-moved-ws", options, N_("<mode>"), + N_("how white spaces are ignored in --color-moved"), + 0, diff_opt_color_moved_ws), + + OPT_GROUP(N_("Other diff options")), + OPT_CALLBACK_F(0, "relative", options, N_("<prefix>"), + N_("when run from subdir, exclude changes outside and show relative paths"), + PARSE_OPT_OPTARG, + diff_opt_relative), + OPT_BOOL('a', "text", &options->flags.text, + N_("treat all files as text")), + OPT_BOOL('R', NULL, &options->flags.reverse_diff, + N_("swap two inputs, reverse the diff")), + OPT_BOOL(0, "exit-code", &options->flags.exit_with_status, + N_("exit with 1 if there were differences, 0 otherwise")), + OPT_BOOL(0, "quiet", &options->flags.quick, + N_("disable all output of the program")), + OPT_BOOL(0, "ext-diff", &options->flags.allow_external, + N_("allow an external diff helper to be executed")), + OPT_CALLBACK_F(0, "textconv", options, NULL, + N_("run external text conversion filters when comparing binary files"), + PARSE_OPT_NOARG, diff_opt_textconv), + OPT_CALLBACK_F(0, "ignore-submodules", options, N_("<when>"), + N_("ignore changes to submodules in the diff generation"), + PARSE_OPT_NONEG | PARSE_OPT_OPTARG, + diff_opt_ignore_submodules), + OPT_CALLBACK_F(0, "submodule", options, N_("<format>"), + N_("specify how differences in submodules are shown"), + PARSE_OPT_NONEG | PARSE_OPT_OPTARG, + diff_opt_submodule), + OPT_SET_INT_F(0, "ita-invisible-in-index", &options->ita_invisible_in_index, + N_("hide 'git add -N' entries from the index"), + 1, PARSE_OPT_NONEG), + OPT_SET_INT_F(0, "ita-visible-in-index", &options->ita_invisible_in_index, + N_("treat 'git add -N' entries as real in the index"), + 0, PARSE_OPT_NONEG), + OPT_CALLBACK_F('S', NULL, options, N_("<string>"), + N_("look for differences that change the number of occurrences of the specified string"), + 0, diff_opt_pickaxe_string), + OPT_CALLBACK_F('G', NULL, options, N_("<regex>"), + N_("look for differences that change the number of occurrences of the specified regex"), + 0, diff_opt_pickaxe_regex), + OPT_BIT_F(0, "pickaxe-all", &options->pickaxe_opts, + N_("show all changes in the changeset with -S or -G"), + DIFF_PICKAXE_ALL, PARSE_OPT_NONEG), + OPT_BIT_F(0, "pickaxe-regex", &options->pickaxe_opts, + N_("treat <string> in -S as extended POSIX regular expression"), + DIFF_PICKAXE_REGEX, PARSE_OPT_NONEG), + OPT_FILENAME('O', NULL, &options->orderfile, + N_("control the order in which files appear in the output")), + OPT_CALLBACK_F(0, "rotate-to", options, N_("<path>"), + N_("show the change in the specified path first"), + PARSE_OPT_NONEG, diff_opt_rotate_to), + OPT_CALLBACK_F(0, "skip-to", options, N_("<path>"), + N_("skip the output to the specified path"), + PARSE_OPT_NONEG, diff_opt_rotate_to), + OPT_CALLBACK_F(0, "find-object", options, N_("<object-id>"), + N_("look for differences that change the number of occurrences of the specified object"), + PARSE_OPT_NONEG, diff_opt_find_object), + OPT_CALLBACK_F(0, "diff-filter", options, N_("[(A|C|D|M|R|T|U|X|B)...[*]]"), + N_("select files by diff type"), + PARSE_OPT_NONEG, diff_opt_diff_filter), + { OPTION_CALLBACK, 0, "output", options, N_("<file>"), + N_("output to a specific file"), + PARSE_OPT_NONEG, NULL, 0, diff_opt_output }, + + OPT_END() + }; + + return parse_options_concat(opts, parseopts); +} + +int diff_opt_parse(struct diff_options *options, + const char **av, int ac, const char *prefix) +{ + struct option no_options[] = { OPT_END() }; + struct option *parseopts = add_diff_options(no_options, options); + + if (!prefix) + prefix = ""; + + ac = parse_options(ac, av, prefix, parseopts, NULL, + PARSE_OPT_KEEP_DASHDASH | + PARSE_OPT_KEEP_UNKNOWN_OPT | + PARSE_OPT_NO_INTERNAL_HELP | + PARSE_OPT_ONE_SHOT | + PARSE_OPT_STOP_AT_NON_OPTION); + free(parseopts); + + return ac; +} + +int parse_rename_score(const char **cp_p) +{ + unsigned long num, scale; + int ch, dot; + const char *cp = *cp_p; + + num = 0; + scale = 1; + dot = 0; + for (;;) { + ch = *cp; + if ( !dot && ch == '.' ) { + scale = 1; + dot = 1; + } else if ( ch == '%' ) { + scale = dot ? scale*100 : 100; + cp++; /* % is always at the end */ + break; + } else if ( ch >= '0' && ch <= '9' ) { + if ( scale < 100000 ) { + scale *= 10; + num = (num*10) + (ch-'0'); + } + } else { + break; + } + cp++; + } + *cp_p = cp; + + /* user says num divided by scale and we say internally that + * is MAX_SCORE * num / scale. + */ + return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale)); +} + +struct diff_queue_struct diff_queued_diff; + +void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp) +{ + ALLOC_GROW(queue->queue, queue->nr + 1, queue->alloc); + queue->queue[queue->nr++] = dp; +} + +struct diff_filepair *diff_queue(struct diff_queue_struct *queue, + struct diff_filespec *one, + struct diff_filespec *two) +{ + struct diff_filepair *dp = xcalloc(1, sizeof(*dp)); + dp->one = one; + dp->two = two; + if (queue) + diff_q(queue, dp); + return dp; +} + +void diff_free_filepair(struct diff_filepair *p) +{ + free_filespec(p->one); + free_filespec(p->two); + free(p); +} + +void diff_free_queue(struct diff_queue_struct *q) +{ + for (int i = 0; i < q->nr; i++) + diff_free_filepair(q->queue[i]); + free(q->queue); +} + +const char *diff_aligned_abbrev(const struct object_id *oid, int len) +{ + int abblen; + const char *abbrev; + + /* Do we want all 40 hex characters? */ + if (len == the_hash_algo->hexsz) + return oid_to_hex(oid); + + /* An abbreviated value is fine, possibly followed by an ellipsis. */ + abbrev = diff_abbrev_oid(oid, len); + + if (!print_sha1_ellipsis()) + return abbrev; + + abblen = strlen(abbrev); + + /* + * In well-behaved cases, where the abbreviated result is the + * same as the requested length, append three dots after the + * abbreviation (hence the whole logic is limited to the case + * where abblen < 37); when the actual abbreviated result is a + * bit longer than the requested length, we reduce the number + * of dots so that they match the well-behaved ones. However, + * if the actual abbreviation is longer than the requested + * length by more than three, we give up on aligning, and add + * three dots anyway, to indicate that the output is not the + * full object name. Yes, this may be suboptimal, but this + * appears only in "diff --raw --abbrev" output and it is not + * worth the effort to change it now. Note that this would + * likely to work fine when the automatic sizing of default + * abbreviation length is used--we would be fed -1 in "len" in + * that case, and will end up always appending three-dots, but + * the automatic sizing is supposed to give abblen that ensures + * uniqueness across all objects (statistically speaking). + */ + if (abblen < the_hash_algo->hexsz - 3) { + static char hex[GIT_MAX_HEXSZ + 1]; + if (len < abblen && abblen <= len + 2) + xsnprintf(hex, sizeof(hex), "%s%.*s", abbrev, len+3-abblen, ".."); + else + xsnprintf(hex, sizeof(hex), "%s...", abbrev); + return hex; + } + + return oid_to_hex(oid); +} + +static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt) +{ + int line_termination = opt->line_termination; + int inter_name_termination = line_termination ? '\t' : '\0'; + + fprintf(opt->file, "%s", diff_line_prefix(opt)); + if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) { + fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode, + diff_aligned_abbrev(&p->one->oid, opt->abbrev)); + fprintf(opt->file, "%s ", + diff_aligned_abbrev(&p->two->oid, opt->abbrev)); + } + if (p->score) { + fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p), + inter_name_termination); + } else { + fprintf(opt->file, "%c%c", p->status, inter_name_termination); + } + + if (p->status == DIFF_STATUS_COPIED || + p->status == DIFF_STATUS_RENAMED) { + const char *name_a, *name_b; + name_a = p->one->path; + name_b = p->two->path; + strip_prefix(opt->prefix_length, &name_a, &name_b); + write_name_quoted(name_a, opt->file, inter_name_termination); + write_name_quoted(name_b, opt->file, line_termination); + } else { + const char *name_a, *name_b; + name_a = p->one->mode ? p->one->path : p->two->path; + name_b = NULL; + strip_prefix(opt->prefix_length, &name_a, &name_b); + write_name_quoted(name_a, opt->file, line_termination); + } +} + +int diff_unmodified_pair(struct diff_filepair *p) +{ + /* This function is written stricter than necessary to support + * the currently implemented transformers, but the idea is to + * let transformers to produce diff_filepairs any way they want, + * and filter and clean them up here before producing the output. + */ + struct diff_filespec *one = p->one, *two = p->two; + + if (DIFF_PAIR_UNMERGED(p)) + return 0; /* unmerged is interesting */ + + /* deletion, addition, mode or type change + * and rename are all interesting. + */ + if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) || + DIFF_PAIR_MODE_CHANGED(p) || + strcmp(one->path, two->path)) + return 0; + + /* both are valid and point at the same path. that is, we are + * dealing with a change. + */ + if (one->oid_valid && two->oid_valid && + oideq(&one->oid, &two->oid) && + !one->dirty_submodule && !two->dirty_submodule) + return 1; /* no change */ + if (!one->oid_valid && !two->oid_valid) + return 1; /* both look at the same file on the filesystem. */ + return 0; +} + +static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o) +{ + int include_conflict_headers = + (additional_headers(o, p->one->path) && + !o->pickaxe_opts && + (!o->filter || filter_bit_tst(DIFF_STATUS_UNMERGED, o))); + + /* + * Check if we can return early without showing a diff. Note that + * diff_filepair only stores {oid, path, mode, is_valid} + * information for each path, and thus diff_unmodified_pair() only + * considers those bits of info. However, we do not want pairs + * created by create_filepairs_for_header_only_notifications() + * (which always look like unmodified pairs) to be ignored, so + * return early if both p is unmodified AND we don't want to + * include_conflict_headers. + */ + if (diff_unmodified_pair(p) && !include_conflict_headers) + return; + + /* Actually, we can also return early to avoid showing tree diffs */ + if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) || + (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode))) + return; + + run_diff(p, o); +} + +static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o, + struct diffstat_t *diffstat) +{ + if (diff_unmodified_pair(p)) + return; + + if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) || + (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode))) + return; /* no useful stat for tree diffs */ + + run_diffstat(p, o, diffstat); +} + +static void diff_flush_checkdiff(struct diff_filepair *p, + struct diff_options *o) +{ + if (diff_unmodified_pair(p)) + return; + + if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) || + (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode))) + return; /* nothing to check in tree diffs */ + + run_checkdiff(p, o); +} + +int diff_queue_is_empty(struct diff_options *o) +{ + struct diff_queue_struct *q = &diff_queued_diff; + int i; + int include_conflict_headers = + (o->additional_path_headers && + strmap_get_size(o->additional_path_headers) && + !o->pickaxe_opts && + (!o->filter || filter_bit_tst(DIFF_STATUS_UNMERGED, o))); + + if (include_conflict_headers) + return 0; + + for (i = 0; i < q->nr; i++) + if (!diff_unmodified_pair(q->queue[i])) + return 0; + return 1; +} + +#if DIFF_DEBUG +void diff_debug_filespec(struct diff_filespec *s, int x, const char *one) +{ + fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n", + x, one ? one : "", + s->path, + DIFF_FILE_VALID(s) ? "valid" : "invalid", + s->mode, + s->oid_valid ? oid_to_hex(&s->oid) : ""); + fprintf(stderr, "queue[%d] %s size %lu\n", + x, one ? one : "", + s->size); +} + +void diff_debug_filepair(const struct diff_filepair *p, int i) +{ + diff_debug_filespec(p->one, i, "one"); + diff_debug_filespec(p->two, i, "two"); + fprintf(stderr, "score %d, status %c rename_used %d broken %d\n", + p->score, p->status ? p->status : '?', + p->one->rename_used, p->broken_pair); +} + +void diff_debug_queue(const char *msg, struct diff_queue_struct *q) +{ + int i; + if (msg) + fprintf(stderr, "%s\n", msg); + fprintf(stderr, "q->nr = %d\n", q->nr); + for (i = 0; i < q->nr; i++) { + struct diff_filepair *p = q->queue[i]; + diff_debug_filepair(p, i); + } +} +#endif + +static void diff_resolve_rename_copy(void) +{ + int i; + struct diff_filepair *p; + struct diff_queue_struct *q = &diff_queued_diff; + + diff_debug_queue("resolve-rename-copy", q); + + for (i = 0; i < q->nr; i++) { + p = q->queue[i]; + p->status = 0; /* undecided */ + if (DIFF_PAIR_UNMERGED(p)) + p->status = DIFF_STATUS_UNMERGED; + else if (!DIFF_FILE_VALID(p->one)) + p->status = DIFF_STATUS_ADDED; + else if (!DIFF_FILE_VALID(p->two)) + p->status = DIFF_STATUS_DELETED; + else if (DIFF_PAIR_TYPE_CHANGED(p)) + p->status = DIFF_STATUS_TYPE_CHANGED; + + /* from this point on, we are dealing with a pair + * whose both sides are valid and of the same type, i.e. + * either in-place edit or rename/copy edit. + */ + else if (DIFF_PAIR_RENAME(p)) { + /* + * A rename might have re-connected a broken + * pair up, causing the pathnames to be the + * same again. If so, that's not a rename at + * all, just a modification.. + * + * Otherwise, see if this source was used for + * multiple renames, in which case we decrement + * the count, and call it a copy. + */ + if (!strcmp(p->one->path, p->two->path)) + p->status = DIFF_STATUS_MODIFIED; + else if (--p->one->rename_used > 0) + p->status = DIFF_STATUS_COPIED; + else + p->status = DIFF_STATUS_RENAMED; + } + else if (!oideq(&p->one->oid, &p->two->oid) || + p->one->mode != p->two->mode || + p->one->dirty_submodule || + p->two->dirty_submodule || + is_null_oid(&p->one->oid)) + p->status = DIFF_STATUS_MODIFIED; + else { + /* This is a "no-change" entry and should not + * happen anymore, but prepare for broken callers. + */ + error("feeding unmodified %s to diffcore", + p->one->path); + p->status = DIFF_STATUS_UNKNOWN; + } + } + diff_debug_queue("resolve-rename-copy done", q); +} + +static int check_pair_status(struct diff_filepair *p) +{ + switch (p->status) { + case DIFF_STATUS_UNKNOWN: + return 0; + case 0: + die("internal error in diff-resolve-rename-copy"); + default: + return 1; + } +} + +static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt) +{ + int fmt = opt->output_format; + + if (fmt & DIFF_FORMAT_CHECKDIFF) + diff_flush_checkdiff(p, opt); + else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS)) + diff_flush_raw(p, opt); + else if (fmt & DIFF_FORMAT_NAME) { + const char *name_a, *name_b; + name_a = p->two->path; + name_b = NULL; + strip_prefix(opt->prefix_length, &name_a, &name_b); + fprintf(opt->file, "%s", diff_line_prefix(opt)); + write_name_quoted(name_a, opt->file, opt->line_termination); + } + + opt->found_changes = 1; +} + +static void show_file_mode_name(struct diff_options *opt, const char *newdelete, struct diff_filespec *fs) +{ + struct strbuf sb = STRBUF_INIT; + if (fs->mode) + strbuf_addf(&sb, " %s mode %06o ", newdelete, fs->mode); + else + strbuf_addf(&sb, " %s ", newdelete); + + quote_c_style(fs->path, &sb, NULL, 0); + strbuf_addch(&sb, '\n'); + emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY, + sb.buf, sb.len, 0); + strbuf_release(&sb); +} + +static void show_mode_change(struct diff_options *opt, struct diff_filepair *p, + int show_name) +{ + if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) { + struct strbuf sb = STRBUF_INIT; + strbuf_addf(&sb, " mode change %06o => %06o", + p->one->mode, p->two->mode); + if (show_name) { + strbuf_addch(&sb, ' '); + quote_c_style(p->two->path, &sb, NULL, 0); + } + strbuf_addch(&sb, '\n'); + emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY, + sb.buf, sb.len, 0); + strbuf_release(&sb); + } +} + +static void show_rename_copy(struct diff_options *opt, const char *renamecopy, + struct diff_filepair *p) +{ + struct strbuf sb = STRBUF_INIT; + struct strbuf names = STRBUF_INIT; + + pprint_rename(&names, p->one->path, p->two->path); + strbuf_addf(&sb, " %s %s (%d%%)\n", + renamecopy, names.buf, similarity_index(p)); + strbuf_release(&names); + emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY, + sb.buf, sb.len, 0); + show_mode_change(opt, p, 0); + strbuf_release(&sb); +} + +static void diff_summary(struct diff_options *opt, struct diff_filepair *p) +{ + switch(p->status) { + case DIFF_STATUS_DELETED: + show_file_mode_name(opt, "delete", p->one); + break; + case DIFF_STATUS_ADDED: + show_file_mode_name(opt, "create", p->two); + break; + case DIFF_STATUS_COPIED: + show_rename_copy(opt, "copy", p); + break; + case DIFF_STATUS_RENAMED: + show_rename_copy(opt, "rename", p); + break; + default: + if (p->score) { + struct strbuf sb = STRBUF_INIT; + strbuf_addstr(&sb, " rewrite "); + quote_c_style(p->two->path, &sb, NULL, 0); + strbuf_addf(&sb, " (%d%%)\n", similarity_index(p)); + emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY, + sb.buf, sb.len, 0); + strbuf_release(&sb); + } + show_mode_change(opt, p, !p->score); + break; + } +} + +struct patch_id_t { + git_hash_ctx *ctx; + int patchlen; +}; + +static int remove_space(char *line, int len) +{ + int i; + char *dst = line; + unsigned char c; + + for (i = 0; i < len; i++) + if (!isspace((c = line[i]))) + *dst++ = c; + + return dst - line; +} + +void flush_one_hunk(struct object_id *result, git_hash_ctx *ctx) +{ + unsigned char hash[GIT_MAX_RAWSZ]; + unsigned short carry = 0; + int i; + + the_hash_algo->final_fn(hash, ctx); + the_hash_algo->init_fn(ctx); + /* 20-byte sum, with carry */ + for (i = 0; i < the_hash_algo->rawsz; ++i) { + carry += result->hash[i] + hash[i]; + result->hash[i] = carry; + carry >>= 8; + } +} + +static int patch_id_consume(void *priv, char *line, unsigned long len) +{ + struct patch_id_t *data = priv; + int new_len; + + if (len > 12 && starts_with(line, "\\ ")) + return 0; + new_len = remove_space(line, len); + + the_hash_algo->update_fn(data->ctx, line, new_len); + data->patchlen += new_len; + return 0; +} + +static void patch_id_add_string(git_hash_ctx *ctx, const char *str) +{ + the_hash_algo->update_fn(ctx, str, strlen(str)); +} + +static void patch_id_add_mode(git_hash_ctx *ctx, unsigned mode) +{ + /* large enough for 2^32 in octal */ + char buf[12]; + int len = xsnprintf(buf, sizeof(buf), "%06o", mode); + the_hash_algo->update_fn(ctx, buf, len); +} + +/* returns 0 upon success, and writes result into oid */ +static int diff_get_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only) +{ + struct diff_queue_struct *q = &diff_queued_diff; + int i; + git_hash_ctx ctx; + struct patch_id_t data; + + the_hash_algo->init_fn(&ctx); + memset(&data, 0, sizeof(struct patch_id_t)); + data.ctx = &ctx; + oidclr(oid); + + for (i = 0; i < q->nr; i++) { + xpparam_t xpp; + xdemitconf_t xecfg; + mmfile_t mf1, mf2; + struct diff_filepair *p = q->queue[i]; + int len1, len2; + + memset(&xpp, 0, sizeof(xpp)); + memset(&xecfg, 0, sizeof(xecfg)); + if (p->status == 0) + return error("internal diff status error"); + if (p->status == DIFF_STATUS_UNKNOWN) + continue; + if (diff_unmodified_pair(p)) + continue; + if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) || + (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode))) + continue; + if (DIFF_PAIR_UNMERGED(p)) + continue; + + diff_fill_oid_info(p->one, options->repo->index); + diff_fill_oid_info(p->two, options->repo->index); + + len1 = remove_space(p->one->path, strlen(p->one->path)); + len2 = remove_space(p->two->path, strlen(p->two->path)); + patch_id_add_string(&ctx, "diff--git"); + patch_id_add_string(&ctx, "a/"); + the_hash_algo->update_fn(&ctx, p->one->path, len1); + patch_id_add_string(&ctx, "b/"); + the_hash_algo->update_fn(&ctx, p->two->path, len2); + + if (p->one->mode == 0) { + patch_id_add_string(&ctx, "newfilemode"); + patch_id_add_mode(&ctx, p->two->mode); + } else if (p->two->mode == 0) { + patch_id_add_string(&ctx, "deletedfilemode"); + patch_id_add_mode(&ctx, p->one->mode); + } else if (p->one->mode != p->two->mode) { + patch_id_add_string(&ctx, "oldmode"); + patch_id_add_mode(&ctx, p->one->mode); + patch_id_add_string(&ctx, "newmode"); + patch_id_add_mode(&ctx, p->two->mode); + } + + if (diff_header_only) { + /* don't do anything since we're only populating header info */ + } else if (diff_filespec_is_binary(options->repo, p->one) || + diff_filespec_is_binary(options->repo, p->two)) { + the_hash_algo->update_fn(&ctx, oid_to_hex(&p->one->oid), + the_hash_algo->hexsz); + the_hash_algo->update_fn(&ctx, oid_to_hex(&p->two->oid), + the_hash_algo->hexsz); + } else { + if (p->one->mode == 0) { + patch_id_add_string(&ctx, "---/dev/null"); + patch_id_add_string(&ctx, "+++b/"); + the_hash_algo->update_fn(&ctx, p->two->path, len2); + } else if (p->two->mode == 0) { + patch_id_add_string(&ctx, "---a/"); + the_hash_algo->update_fn(&ctx, p->one->path, len1); + patch_id_add_string(&ctx, "+++/dev/null"); + } else { + patch_id_add_string(&ctx, "---a/"); + the_hash_algo->update_fn(&ctx, p->one->path, len1); + patch_id_add_string(&ctx, "+++b/"); + the_hash_algo->update_fn(&ctx, p->two->path, len2); + } + + if (fill_mmfile(options->repo, &mf1, p->one) < 0 || + fill_mmfile(options->repo, &mf2, p->two) < 0) + return error("unable to read files to diff"); + xpp.flags = 0; + xecfg.ctxlen = 3; + xecfg.flags = XDL_EMIT_NO_HUNK_HDR; + if (xdi_diff_outf(&mf1, &mf2, NULL, + patch_id_consume, &data, &xpp, &xecfg)) + return error("unable to generate patch-id diff for %s", + p->one->path); + } + flush_one_hunk(oid, &ctx); + } + + return 0; +} + +int diff_flush_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only) +{ + struct diff_queue_struct *q = &diff_queued_diff; + int result = diff_get_patch_id(options, oid, diff_header_only); + + diff_free_queue(q); + DIFF_QUEUE_CLEAR(q); + + return result; +} + +static int is_summary_empty(const struct diff_queue_struct *q) +{ + int i; + + for (i = 0; i < q->nr; i++) { + const struct diff_filepair *p = q->queue[i]; + + switch (p->status) { + case DIFF_STATUS_DELETED: + case DIFF_STATUS_ADDED: + case DIFF_STATUS_COPIED: + case DIFF_STATUS_RENAMED: + return 0; + default: + if (p->score) + return 0; + if (p->one->mode && p->two->mode && + p->one->mode != p->two->mode) + return 0; + break; + } + } + return 1; +} + +static const char rename_limit_warning[] = +N_("exhaustive rename detection was skipped due to too many files."); + +static const char degrade_cc_to_c_warning[] = +N_("only found copies from modified paths due to too many files."); + +static const char rename_limit_advice[] = +N_("you may want to set your %s variable to at least " + "%d and retry the command."); + +void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc) +{ + fflush(stdout); + if (degraded_cc) + warning(_(degrade_cc_to_c_warning)); + else if (needed) + warning(_(rename_limit_warning)); + else + return; + if (0 < needed) + warning(_(rename_limit_advice), varname, needed); +} + +static void create_filepairs_for_header_only_notifications(struct diff_options *o) +{ + struct strset present; + struct diff_queue_struct *q = &diff_queued_diff; + struct hashmap_iter iter; + struct strmap_entry *e; + int i; + + strset_init_with_options(&present, /*pool*/ NULL, /*strdup*/ 0); + + /* + * Find out which paths exist in diff_queued_diff, preferring + * one->path for any pair that has multiple paths. + */ + for (i = 0; i < q->nr; i++) { + struct diff_filepair *p = q->queue[i]; + char *path = p->one->path ? p->one->path : p->two->path; + + if (strmap_contains(o->additional_path_headers, path)) + strset_add(&present, path); + } + + /* + * Loop over paths in additional_path_headers; for each NOT already + * in diff_queued_diff, create a synthetic filepair and insert that + * into diff_queued_diff. + */ + strmap_for_each_entry(o->additional_path_headers, &iter, e) { + if (!strset_contains(&present, e->key)) { + struct diff_filespec *one, *two; + struct diff_filepair *p; + + one = alloc_filespec(e->key); + two = alloc_filespec(e->key); + fill_filespec(one, null_oid(), 0, 0); + fill_filespec(two, null_oid(), 0, 0); + p = diff_queue(q, one, two); + p->status = DIFF_STATUS_MODIFIED; + } + } + + /* Re-sort the filepairs */ + diffcore_fix_diff_index(); + + /* Cleanup */ + strset_clear(&present); +} + +static void diff_flush_patch_all_file_pairs(struct diff_options *o) +{ + int i; + static struct emitted_diff_symbols esm = EMITTED_DIFF_SYMBOLS_INIT; + struct diff_queue_struct *q = &diff_queued_diff; + + if (WSEH_NEW & WS_RULE_MASK) + BUG("WS rules bit mask overlaps with diff symbol flags"); + + if (o->color_moved) + o->emitted_symbols = &esm; + + if (o->additional_path_headers) + create_filepairs_for_header_only_notifications(o); + + for (i = 0; i < q->nr; i++) { + struct diff_filepair *p = q->queue[i]; + if (check_pair_status(p)) + diff_flush_patch(p, o); + } + + if (o->emitted_symbols) { + if (o->color_moved) { + struct mem_pool entry_pool; + struct moved_entry_list *entry_list; + + mem_pool_init(&entry_pool, 1024 * 1024); + entry_list = add_lines_to_move_detection(o, + &entry_pool); + mark_color_as_moved(o, entry_list); + if (o->color_moved == COLOR_MOVED_ZEBRA_DIM) + dim_moved_lines(o); + + mem_pool_discard(&entry_pool, 0); + free(entry_list); + } + + for (i = 0; i < esm.nr; i++) + emit_diff_symbol_from_struct(o, &esm.buf[i]); + + for (i = 0; i < esm.nr; i++) + free((void *)esm.buf[i].line); + esm.nr = 0; + + o->emitted_symbols = NULL; + } +} + +static void diff_free_file(struct diff_options *options) +{ + if (options->close_file) + fclose(options->file); +} + +static void diff_free_ignore_regex(struct diff_options *options) +{ + int i; + + for (i = 0; i < options->ignore_regex_nr; i++) { + regfree(options->ignore_regex[i]); + free(options->ignore_regex[i]); + } + free(options->ignore_regex); +} + +void diff_free(struct diff_options *options) +{ + if (options->no_free) + return; + + diff_free_file(options); + diff_free_ignore_regex(options); + clear_pathspec(&options->pathspec); +} + +void diff_flush(struct diff_options *options) +{ + struct diff_queue_struct *q = &diff_queued_diff; + int i, output_format = options->output_format; + int separator = 0; + int dirstat_by_line = 0; + + /* + * Order: raw, stat, summary, patch + * or: name/name-status/checkdiff (other bits clear) + */ + if (!q->nr && !options->additional_path_headers) + goto free_queue; + + if (output_format & (DIFF_FORMAT_RAW | + DIFF_FORMAT_NAME | + DIFF_FORMAT_NAME_STATUS | + DIFF_FORMAT_CHECKDIFF)) { + for (i = 0; i < q->nr; i++) { + struct diff_filepair *p = q->queue[i]; + if (check_pair_status(p)) + flush_one_pair(p, options); + } + separator++; + } + + if (output_format & DIFF_FORMAT_DIRSTAT && options->flags.dirstat_by_line) + dirstat_by_line = 1; + + if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) || + dirstat_by_line) { + struct diffstat_t diffstat; + + compute_diffstat(options, &diffstat, q); + if (output_format & DIFF_FORMAT_NUMSTAT) + show_numstat(&diffstat, options); + if (output_format & DIFF_FORMAT_DIFFSTAT) + show_stats(&diffstat, options); + if (output_format & DIFF_FORMAT_SHORTSTAT) + show_shortstats(&diffstat, options); + if (output_format & DIFF_FORMAT_DIRSTAT && dirstat_by_line) + show_dirstat_by_line(&diffstat, options); + free_diffstat_info(&diffstat); + separator++; + } + if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line) + show_dirstat(options); + + if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) { + for (i = 0; i < q->nr; i++) { + diff_summary(options, q->queue[i]); + } + separator++; + } + + if (output_format & DIFF_FORMAT_PATCH) { + if (separator) { + emit_diff_symbol(options, DIFF_SYMBOL_SEPARATOR, NULL, 0, 0); + if (options->stat_sep) + /* attach patch instead of inline */ + emit_diff_symbol(options, DIFF_SYMBOL_STAT_SEP, + NULL, 0, 0); + } + + diff_flush_patch_all_file_pairs(options); + } + + if (output_format & DIFF_FORMAT_CALLBACK) + options->format_callback(q, options, options->format_callback_data); + + if (output_format & DIFF_FORMAT_NO_OUTPUT && + options->flags.exit_with_status && + options->flags.diff_from_contents) { + /* + * run diff_flush_patch for the exit status. setting + * options->file to /dev/null should be safe, because we + * aren't supposed to produce any output anyway. + */ + diff_free_file(options); + options->file = xfopen("/dev/null", "w"); + options->close_file = 1; + options->color_moved = 0; + for (i = 0; i < q->nr; i++) { + struct diff_filepair *p = q->queue[i]; + if (check_pair_status(p)) + diff_flush_patch(p, options); + if (options->found_changes) + break; + } + } + +free_queue: + diff_free_queue(q); + DIFF_QUEUE_CLEAR(q); + diff_free(options); + + /* + * Report the content-level differences with HAS_CHANGES; + * diff_addremove/diff_change does not set the bit when + * DIFF_FROM_CONTENTS is in effect (e.g. with -w). + */ + if (options->flags.diff_from_contents) { + if (options->found_changes) + options->flags.has_changes = 1; + else + options->flags.has_changes = 0; + } +} + +static int match_filter(const struct diff_options *options, const struct diff_filepair *p) +{ + return (((p->status == DIFF_STATUS_MODIFIED) && + ((p->score && + filter_bit_tst(DIFF_STATUS_FILTER_BROKEN, options)) || + (!p->score && + filter_bit_tst(DIFF_STATUS_MODIFIED, options)))) || + ((p->status != DIFF_STATUS_MODIFIED) && + filter_bit_tst(p->status, options))); +} + +static void diffcore_apply_filter(struct diff_options *options) +{ + int i; + struct diff_queue_struct *q = &diff_queued_diff; + struct diff_queue_struct outq; + + DIFF_QUEUE_CLEAR(&outq); + + if (!options->filter) + return; + + if (filter_bit_tst(DIFF_STATUS_FILTER_AON, options)) { + int found; + for (i = found = 0; !found && i < q->nr; i++) { + if (match_filter(options, q->queue[i])) + found++; + } + if (found) + return; + + /* otherwise we will clear the whole queue + * by copying the empty outq at the end of this + * function, but first clear the current entries + * in the queue. + */ + for (i = 0; i < q->nr; i++) + diff_free_filepair(q->queue[i]); + } + else { + /* Only the matching ones */ + for (i = 0; i < q->nr; i++) { + struct diff_filepair *p = q->queue[i]; + if (match_filter(options, p)) + diff_q(&outq, p); + else + diff_free_filepair(p); + } + } + free(q->queue); + *q = outq; +} + +/* Check whether two filespecs with the same mode and size are identical */ +static int diff_filespec_is_identical(struct repository *r, + struct diff_filespec *one, + struct diff_filespec *two) +{ + if (S_ISGITLINK(one->mode)) + return 0; + if (diff_populate_filespec(r, one, NULL)) + return 0; + if (diff_populate_filespec(r, two, NULL)) + return 0; + return !memcmp(one->data, two->data, one->size); +} + +static int diff_filespec_check_stat_unmatch(struct repository *r, + struct diff_filepair *p) +{ + struct diff_populate_filespec_options dpf_options = { + .check_size_only = 1, + .missing_object_cb = diff_queued_diff_prefetch, + .missing_object_data = r, + }; + + if (p->done_skip_stat_unmatch) + return p->skip_stat_unmatch_result; + + p->done_skip_stat_unmatch = 1; + p->skip_stat_unmatch_result = 0; + /* + * 1. Entries that come from stat info dirtiness + * always have both sides (iow, not create/delete), + * one side of the object name is unknown, with + * the same mode and size. Keep the ones that + * do not match these criteria. They have real + * differences. + * + * 2. At this point, the file is known to be modified, + * with the same mode and size, and the object + * name of one side is unknown. Need to inspect + * the identical contents. + */ + if (!DIFF_FILE_VALID(p->one) || /* (1) */ + !DIFF_FILE_VALID(p->two) || + (p->one->oid_valid && p->two->oid_valid) || + (p->one->mode != p->two->mode) || + diff_populate_filespec(r, p->one, &dpf_options) || + diff_populate_filespec(r, p->two, &dpf_options) || + (p->one->size != p->two->size) || + !diff_filespec_is_identical(r, p->one, p->two)) /* (2) */ + p->skip_stat_unmatch_result = 1; + return p->skip_stat_unmatch_result; +} + +static void diffcore_skip_stat_unmatch(struct diff_options *diffopt) +{ + int i; + struct diff_queue_struct *q = &diff_queued_diff; + struct diff_queue_struct outq; + DIFF_QUEUE_CLEAR(&outq); + + for (i = 0; i < q->nr; i++) { + struct diff_filepair *p = q->queue[i]; + + if (diff_filespec_check_stat_unmatch(diffopt->repo, p)) + diff_q(&outq, p); + else { + /* + * The caller can subtract 1 from skip_stat_unmatch + * to determine how many paths were dirty only + * due to stat info mismatch. + */ + if (!diffopt->flags.no_index) + diffopt->skip_stat_unmatch++; + diff_free_filepair(p); + } + } + free(q->queue); + *q = outq; +} + +static int diffnamecmp(const void *a_, const void *b_) +{ + const struct diff_filepair *a = *((const struct diff_filepair **)a_); + const struct diff_filepair *b = *((const struct diff_filepair **)b_); + const char *name_a, *name_b; + + name_a = a->one ? a->one->path : a->two->path; + name_b = b->one ? b->one->path : b->two->path; + return strcmp(name_a, name_b); +} + +void diffcore_fix_diff_index(void) +{ + struct diff_queue_struct *q = &diff_queued_diff; + QSORT(q->queue, q->nr, diffnamecmp); +} + +void diff_add_if_missing(struct repository *r, + struct oid_array *to_fetch, + const struct diff_filespec *filespec) +{ + if (filespec && filespec->oid_valid && + !S_ISGITLINK(filespec->mode) && + oid_object_info_extended(r, &filespec->oid, NULL, + OBJECT_INFO_FOR_PREFETCH)) + oid_array_append(to_fetch, &filespec->oid); +} + +void diff_queued_diff_prefetch(void *repository) +{ + struct repository *repo = repository; + int i; + struct diff_queue_struct *q = &diff_queued_diff; + struct oid_array to_fetch = OID_ARRAY_INIT; + + for (i = 0; i < q->nr; i++) { + struct diff_filepair *p = q->queue[i]; + diff_add_if_missing(repo, &to_fetch, p->one); + diff_add_if_missing(repo, &to_fetch, p->two); + } + + /* + * NEEDSWORK: Consider deduplicating the OIDs sent. + */ + promisor_remote_get_direct(repo, to_fetch.oid, to_fetch.nr); + + oid_array_clear(&to_fetch); +} + +void init_diffstat_widths(struct diff_options *options) +{ + options->stat_width = -1; /* use full terminal width */ + options->stat_name_width = -1; /* respect diff.statNameWidth config */ + options->stat_graph_width = -1; /* respect diff.statGraphWidth config */ +} + +void diffcore_std(struct diff_options *options) +{ + int output_formats_to_prefetch = DIFF_FORMAT_DIFFSTAT | + DIFF_FORMAT_NUMSTAT | + DIFF_FORMAT_PATCH | + DIFF_FORMAT_SHORTSTAT | + DIFF_FORMAT_DIRSTAT; + + /* + * Check if the user requested a blob-data-requiring diff output and/or + * break-rewrite detection (which requires blob data). If yes, prefetch + * the diff pairs. + * + * If no prefetching occurs, diffcore_rename() will prefetch if it + * decides that it needs inexact rename detection. + */ + if (options->repo == the_repository && repo_has_promisor_remote(the_repository) && + (options->output_format & output_formats_to_prefetch || + options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK)) + diff_queued_diff_prefetch(options->repo); + + /* NOTE please keep the following in sync with diff_tree_combined() */ + if (options->skip_stat_unmatch) + diffcore_skip_stat_unmatch(options); + if (!options->found_follow) { + /* See try_to_follow_renames() in tree-diff.c */ + if (options->break_opt != -1) + diffcore_break(options->repo, + options->break_opt); + if (options->detect_rename) + diffcore_rename(options); + if (options->break_opt != -1) + diffcore_merge_broken(); + } + if (options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK) + diffcore_pickaxe(options); + if (options->orderfile) + diffcore_order(options->orderfile); + if (options->rotate_to) + diffcore_rotate(options); + if (!options->found_follow) + /* See try_to_follow_renames() in tree-diff.c */ + diff_resolve_rename_copy(); + diffcore_apply_filter(options); + + if (diff_queued_diff.nr && !options->flags.diff_from_contents) + options->flags.has_changes = 1; + else + options->flags.has_changes = 0; + + options->found_follow = 0; +} + +int diff_result_code(struct diff_options *opt) +{ + int result = 0; + + diff_warn_rename_limit("diff.renameLimit", + opt->needed_rename_limit, + opt->degraded_cc_to_c); + + if (opt->flags.exit_with_status && + opt->flags.has_changes) + result |= 01; + if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) && + opt->flags.check_failed) + result |= 02; + return result; +} + +int diff_can_quit_early(struct diff_options *opt) +{ + return (opt->flags.quick && + !opt->filter && + opt->flags.has_changes); +} + +/* + * Shall changes to this submodule be ignored? + * + * Submodule changes can be configured to be ignored separately for each path, + * but that configuration can be overridden from the command line. + */ +static int is_submodule_ignored(const char *path, struct diff_options *options) +{ + int ignored = 0; + struct diff_flags orig_flags = options->flags; + if (!options->flags.override_submodule_config) + set_diffopt_flags_from_submodule_config(options, path); + if (options->flags.ignore_submodules) + ignored = 1; + options->flags = orig_flags; + return ignored; +} + +void compute_diffstat(struct diff_options *options, + struct diffstat_t *diffstat, + struct diff_queue_struct *q) +{ + int i; + + memset(diffstat, 0, sizeof(struct diffstat_t)); + for (i = 0; i < q->nr; i++) { + struct diff_filepair *p = q->queue[i]; + if (check_pair_status(p)) + diff_flush_stat(p, options, diffstat); + } + options->found_changes = !!diffstat->nr; +} + +void diff_addremove(struct diff_options *options, + int addremove, unsigned mode, + const struct object_id *oid, + int oid_valid, + const char *concatpath, unsigned dirty_submodule) +{ + struct diff_filespec *one, *two; + + if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options)) + return; + + /* This may look odd, but it is a preparation for + * feeding "there are unchanged files which should + * not produce diffs, but when you are doing copy + * detection you would need them, so here they are" + * entries to the diff-core. They will be prefixed + * with something like '=' or '*' (I haven't decided + * which but should not make any difference). + * Feeding the same new and old to diff_change() + * also has the same effect. + * Before the final output happens, they are pruned after + * merged into rename/copy pairs as appropriate. + */ + if (options->flags.reverse_diff) + addremove = (addremove == '+' ? '-' : + addremove == '-' ? '+' : addremove); + + if (options->prefix && + strncmp(concatpath, options->prefix, options->prefix_length)) + return; + + one = alloc_filespec(concatpath); + two = alloc_filespec(concatpath); + + if (addremove != '+') + fill_filespec(one, oid, oid_valid, mode); + if (addremove != '-') { + fill_filespec(two, oid, oid_valid, mode); + two->dirty_submodule = dirty_submodule; + } + + diff_queue(&diff_queued_diff, one, two); + if (!options->flags.diff_from_contents) + options->flags.has_changes = 1; +} + +void diff_change(struct diff_options *options, + unsigned old_mode, unsigned new_mode, + const struct object_id *old_oid, + const struct object_id *new_oid, + int old_oid_valid, int new_oid_valid, + const char *concatpath, + unsigned old_dirty_submodule, unsigned new_dirty_submodule) +{ + struct diff_filespec *one, *two; + struct diff_filepair *p; + + if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) && + is_submodule_ignored(concatpath, options)) + return; + + if (options->flags.reverse_diff) { + SWAP(old_mode, new_mode); + SWAP(old_oid, new_oid); + SWAP(old_oid_valid, new_oid_valid); + SWAP(old_dirty_submodule, new_dirty_submodule); + } + + if (options->prefix && + strncmp(concatpath, options->prefix, options->prefix_length)) + return; + + one = alloc_filespec(concatpath); + two = alloc_filespec(concatpath); + fill_filespec(one, old_oid, old_oid_valid, old_mode); + fill_filespec(two, new_oid, new_oid_valid, new_mode); + one->dirty_submodule = old_dirty_submodule; + two->dirty_submodule = new_dirty_submodule; + p = diff_queue(&diff_queued_diff, one, two); + + if (options->flags.diff_from_contents) + return; + + if (options->flags.quick && options->skip_stat_unmatch && + !diff_filespec_check_stat_unmatch(options->repo, p)) { + diff_free_filespec_data(p->one); + diff_free_filespec_data(p->two); + return; + } + + options->flags.has_changes = 1; +} + +struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path) +{ + struct diff_filepair *pair; + struct diff_filespec *one, *two; + + if (options->prefix && + strncmp(path, options->prefix, options->prefix_length)) + return NULL; + + one = alloc_filespec(path); + two = alloc_filespec(path); + pair = diff_queue(&diff_queued_diff, one, two); + pair->is_unmerged = 1; + return pair; +} + +static char *run_textconv(struct repository *r, + const char *pgm, + struct diff_filespec *spec, + size_t *outsize) +{ + struct diff_tempfile *temp; + struct child_process child = CHILD_PROCESS_INIT; + struct strbuf buf = STRBUF_INIT; + int err = 0; + + temp = prepare_temp_file(r, spec); + strvec_push(&child.args, pgm); + strvec_push(&child.args, temp->name); + + child.use_shell = 1; + child.out = -1; + if (start_command(&child)) { + remove_tempfile(); + return NULL; + } + + if (strbuf_read(&buf, child.out, 0) < 0) + err = error("error reading from textconv command '%s'", pgm); + close(child.out); + + if (finish_command(&child) || err) { + strbuf_release(&buf); + remove_tempfile(); + return NULL; + } + remove_tempfile(); + + return strbuf_detach(&buf, outsize); +} + +size_t fill_textconv(struct repository *r, + struct userdiff_driver *driver, + struct diff_filespec *df, + char **outbuf) +{ + size_t size; + + if (!driver) { + if (!DIFF_FILE_VALID(df)) { + *outbuf = ""; + return 0; + } + if (diff_populate_filespec(r, df, NULL)) + die("unable to read files to diff"); + *outbuf = df->data; + return df->size; + } + + if (!driver->textconv) + BUG("fill_textconv called with non-textconv driver"); + + if (driver->textconv_cache && df->oid_valid) { + *outbuf = notes_cache_get(driver->textconv_cache, + &df->oid, + &size); + if (*outbuf) + return size; + } + + *outbuf = run_textconv(r, driver->textconv, df, &size); + if (!*outbuf) + die("unable to read files to diff"); + + if (driver->textconv_cache && df->oid_valid) { + /* ignore errors, as we might be in a readonly repository */ + notes_cache_put(driver->textconv_cache, &df->oid, *outbuf, + size); + /* + * we could save up changes and flush them all at the end, + * but we would need an extra call after all diffing is done. + * Since generating a cache entry is the slow path anyway, + * this extra overhead probably isn't a big deal. + */ + notes_cache_write(driver->textconv_cache); + } + + return size; +} + +int textconv_object(struct repository *r, + const char *path, + unsigned mode, + const struct object_id *oid, + int oid_valid, + char **buf, + unsigned long *buf_size) +{ + struct diff_filespec *df; + struct userdiff_driver *textconv; + + df = alloc_filespec(path); + fill_filespec(df, oid, oid_valid, mode); + textconv = get_textconv(r, df); + if (!textconv) { + free_filespec(df); + return 0; + } + + *buf_size = fill_textconv(r, textconv, df, buf); + free_filespec(df); + return 1; +} + +void setup_diff_pager(struct diff_options *opt) +{ + /* + * If the user asked for our exit code, then either they want --quiet + * or --exit-code. We should definitely not bother with a pager in the + * former case, as we will generate no output. Since we still properly + * report our exit code even when a pager is run, we _could_ run a + * pager with --exit-code. But since we have not done so historically, + * and because it is easy to find people oneline advising "git diff + * --exit-code" in hooks and other scripts, we do not do so. + */ + if (!opt->flags.exit_with_status && + check_pager_config("diff") != 0) + setup_pager(); +} |