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-rw-r--r--diff.c7152
1 files changed, 7152 insertions, 0 deletions
diff --git a/diff.c b/diff.c
new file mode 100644
index 0000000..1054a4b
--- /dev/null
+++ b/diff.c
@@ -0,0 +1,7152 @@
+/*
+ * Copyright (C) 2005 Junio C Hamano
+ */
+#include "cache.h"
+#include "config.h"
+#include "tempfile.h"
+#include "quote.h"
+#include "diff.h"
+#include "diffcore.h"
+#include "delta.h"
+#include "xdiff-interface.h"
+#include "color.h"
+#include "attr.h"
+#include "run-command.h"
+#include "utf8.h"
+#include "object-store.h"
+#include "userdiff.h"
+#include "submodule-config.h"
+#include "submodule.h"
+#include "hashmap.h"
+#include "mem-pool.h"
+#include "ll-merge.h"
+#include "string-list.h"
+#include "strvec.h"
+#include "graph.h"
+#include "packfile.h"
+#include "parse-options.h"
+#include "help.h"
+#include "promisor-remote.h"
+#include "dir.h"
+#include "strmap.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_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(&params, 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(&params, 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, 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);
+ if (diff_context_default < 0)
+ return -1;
+ return 0;
+ }
+ if (!strcmp(var, "diff.interhunkcontext")) {
+ diff_interhunk_context_default = git_config_int(var, value);
+ 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.statgraphwidth")) {
+ diff_stat_graph_width = git_config_int(var, value);
+ 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, cb);
+}
+
+int git_diff_basic_config(const char *var, const char *value, void *cb)
+{
+ const char *name;
+
+ if (!strcmp(var, "diff.renamelimit")) {
+ diff_rename_limit_default = git_config_int(var, value);
+ 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, 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, unsigned ws_rule)
+{
+ 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, ws_rule))
+ 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;
+ unsigned ws_rule = ecbdata->ws_rule;
+ l1 = count_trailing_blank(mf1, ws_rule);
+ l2 = count_trailing_blank(mf2, ws_rule);
+ 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, ecbdata->ws_rule);
+}
+
+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, long funclen)
+{
+ 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_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");
+ 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 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++;
+ }
+
+ /* This can happen even with many files, if everything was renames */
+ if (!changed)
+ return;
+
+ /* Show all directories with more than x% of the changes */
+ QSORT(dir.files, dir.nr, dirstat_compare);
+ gather_dirstat(options, &dir, changed, "", 0);
+}
+
+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++;
+ }
+
+ /* This can happen even with many files, if everything was renames */
+ if (!changed)
+ return;
+
+ /* Show all directories with more than x% of the changes */
+ QSORT(dir.files, dir.nr, dirstat_compare);
+ gather_dirstat(options, &dir, changed, "", 0);
+}
+
+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, long on, long nb, long nn,
+ const char *func, long funclen)
+
+{
+ 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;
+}
+
+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 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);
+ 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);
+ 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);
+ 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,
+ const char *name,
+ 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, name, &one->oid, 1))) {
+ struct stat st;
+ if (lstat(name, &st) < 0) {
+ if (errno == ENOENT)
+ goto not_a_valid_file;
+ die_errno("stat(%s)", name);
+ }
+ if (S_ISLNK(st.st_mode)) {
+ struct strbuf sb = STRBUF_INIT;
+ if (strbuf_readlink(&sb, name, st.st_size) < 0)
+ die_errno("readlink(%s)", name);
+ prep_temp_blob(r->index, name, 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 = name;
+ 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, name, temp,
+ one->data, one->size,
+ &one->oid, one->mode);
+ }
+ return temp;
+}
+
+static void add_external_diff_name(struct repository *r,
+ struct strvec *argv,
+ const char *name,
+ struct diff_filespec *df)
+{
+ struct diff_tempfile *temp = prepare_temp_file(r, name, 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, name, one);
+ if (!other)
+ add_external_diff_name(o->repo, &cmd.args, name, two);
+ else {
+ add_external_diff_name(o->repo, &cmd.args, other, two);
+ 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 find_unique_abbrev(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;
+
+
+ if (o->flags.allow_external) {
+ struct userdiff_driver *drv;
+
+ drv = userdiff_find_by_path(o->repo->index, attr_path);
+ if (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)
+ 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 (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);
+}
+
+static void prep_parse_options(struct diff_options *options);
+
+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) {
+ options->a_prefix = options->b_prefix = "";
+ } else if (!diff_mnemonic_prefix) {
+ options->a_prefix = "a/";
+ options->b_prefix = "b/";
+ }
+
+ options->color_moved = diff_color_moved_default;
+ options->color_moved_ws_handling = diff_color_moved_ws_default;
+
+ prep_parse_options(options);
+}
+
+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];
+}
+
+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;
+
+ 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 && options->pathspec.nr != 1)
+ die(_("--follow requires exactly one pathspec"));
+
+ 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;
+ }
+
+ FREE_AND_NULL(options->parseopts);
+}
+
+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_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_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 (get_oid(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_DIFFSTAT;
+ }
+ return 0;
+}
+
+static int diff_opt_diff_algorithm(const struct option *opt,
+ const char *arg, int unset)
+{
+ struct diff_options *options = opt->value;
+ long value = parse_algorithm_value(arg);
+
+ BUG_ON_OPT_NEG(unset);
+ if (value < 0)
+ return error(_("option diff-algorithm accepts \"myers\", "
+ "\"minimal\", \"patience\" and \"histogram\""));
+
+ /* clear out previous settings */
+ DIFF_XDL_CLR(options, NEED_MINIMAL);
+ options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
+ options->xdl_opts |= value;
+ 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);
+ options->a_prefix = "";
+ options->b_prefix = "";
+ 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);
+ options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
+ /*
+ * 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;
+ return 0;
+}
+
+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;
+}
+
+static void prep_parse_options(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_BIT_F('s', "no-patch", &options->output_format,
+ N_("suppress diff output"),
+ DIFF_FORMAT_NO_OUTPUT, PARSE_OPT_NONEG),
+ 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_BIT_F(0, "raw", &options->output_format,
+ N_("generate the diff in raw format"),
+ DIFF_FORMAT_RAW, PARSE_OPT_NONEG),
+ 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_BIT_F(0, "numstat", &options->output_format,
+ N_("machine friendly --stat"),
+ DIFF_FORMAT_NUMSTAT, PARSE_OPT_NONEG),
+ OPT_BIT_F(0, "shortstat", &options->output_format,
+ N_("output only the last line of --stat"),
+ DIFF_FORMAT_SHORTSTAT, PARSE_OPT_NONEG),
+ 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_BIT_F(0, "summary", &options->output_format,
+ N_("condensed summary such as creations, renames and mode changes"),
+ DIFF_FORMAT_SUMMARY, PARSE_OPT_NONEG),
+ 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_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_BIT(0, "minimal", &options->xdl_opts,
+ N_("produce the smallest possible diff"),
+ XDF_NEED_MINIMAL),
+ 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_BITOP(0, "histogram", &options->xdl_opts,
+ N_("generate diff using the \"histogram diff\" algorithm"),
+ XDF_HISTOGRAM_DIFF, XDF_DIFF_ALGORITHM_MASK),
+ 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()
+ };
+
+ ALLOC_ARRAY(options->parseopts, ARRAY_SIZE(parseopts));
+ memcpy(options->parseopts, parseopts, sizeof(parseopts));
+}
+
+int diff_opt_parse(struct diff_options *options,
+ const char **av, int ac, const char *prefix)
+{
+ if (!prefix)
+ prefix = "";
+
+ ac = parse_options(ac, av, prefix, options->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);
+
+ 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);
+ }
+}
+
+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);
+ FREE_AND_NULL(options->parseopts);
+}
+
+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_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;
+ }
+ }
+
+ 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);
+
+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 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 && has_promisor_remote() &&
+ (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 status)
+{
+ 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->output_format & DIFF_FORMAT_CHECKDIFF))
+ return status;
+ 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);
+ }
+}
+
+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->path, 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();
+}