diff options
Diffstat (limited to '')
| -rw-r--r-- | builtin/patch-id.c | 240 |
1 files changed, 240 insertions, 0 deletions
diff --git a/builtin/patch-id.c b/builtin/patch-id.c new file mode 100644 index 0000000..f840fbf --- /dev/null +++ b/builtin/patch-id.c @@ -0,0 +1,240 @@ +#include "cache.h" +#include "builtin.h" +#include "config.h" +#include "diff.h" +#include "parse-options.h" + +static void flush_current_id(int patchlen, struct object_id *id, struct object_id *result) +{ + if (patchlen) + printf("%s %s\n", oid_to_hex(result), oid_to_hex(id)); +} + +static int remove_space(char *line) +{ + char *src = line; + char *dst = line; + unsigned char c; + + while ((c = *src++) != '\0') { + if (!isspace(c)) + *dst++ = c; + } + return dst - line; +} + +static int scan_hunk_header(const char *p, int *p_before, int *p_after) +{ + static const char digits[] = "0123456789"; + const char *q, *r; + int n; + + q = p + 4; + n = strspn(q, digits); + if (q[n] == ',') { + q += n + 1; + *p_before = atoi(q); + n = strspn(q, digits); + } else { + *p_before = 1; + } + + if (n == 0 || q[n] != ' ' || q[n+1] != '+') + return 0; + + r = q + n + 2; + n = strspn(r, digits); + if (r[n] == ',') { + r += n + 1; + *p_after = atoi(r); + n = strspn(r, digits); + } else { + *p_after = 1; + } + if (n == 0) + return 0; + + return 1; +} + +static int get_one_patchid(struct object_id *next_oid, struct object_id *result, + struct strbuf *line_buf, int stable, int verbatim) +{ + int patchlen = 0, found_next = 0; + int before = -1, after = -1; + int diff_is_binary = 0; + char pre_oid_str[GIT_MAX_HEXSZ + 1], post_oid_str[GIT_MAX_HEXSZ + 1]; + git_hash_ctx ctx; + + the_hash_algo->init_fn(&ctx); + oidclr(result); + + while (strbuf_getwholeline(line_buf, stdin, '\n') != EOF) { + char *line = line_buf->buf; + const char *p = line; + int len; + + /* Possibly skip over the prefix added by "log" or "format-patch" */ + if (!skip_prefix(line, "commit ", &p) && + !skip_prefix(line, "From ", &p) && + starts_with(line, "\\ ") && 12 < strlen(line)) { + if (verbatim) + the_hash_algo->update_fn(&ctx, line, strlen(line)); + continue; + } + + if (!get_oid_hex(p, next_oid)) { + found_next = 1; + break; + } + + /* Ignore commit comments */ + if (!patchlen && !starts_with(line, "diff ")) + continue; + + /* Parsing diff header? */ + if (before == -1) { + if (starts_with(line, "GIT binary patch") || + starts_with(line, "Binary files")) { + diff_is_binary = 1; + before = 0; + the_hash_algo->update_fn(&ctx, pre_oid_str, + strlen(pre_oid_str)); + the_hash_algo->update_fn(&ctx, post_oid_str, + strlen(post_oid_str)); + if (stable) + flush_one_hunk(result, &ctx); + continue; + } else if (skip_prefix(line, "index ", &p)) { + char *oid1_end = strstr(line, ".."); + char *oid2_end = NULL; + if (oid1_end) + oid2_end = strstr(oid1_end, " "); + if (!oid2_end) + oid2_end = line + strlen(line) - 1; + if (oid1_end != NULL && oid2_end != NULL) { + *oid1_end = *oid2_end = '\0'; + strlcpy(pre_oid_str, p, GIT_MAX_HEXSZ + 1); + strlcpy(post_oid_str, oid1_end + 2, GIT_MAX_HEXSZ + 1); + } + continue; + } else if (starts_with(line, "--- ")) + before = after = 1; + else if (!isalpha(line[0])) + break; + } + + if (diff_is_binary) { + if (starts_with(line, "diff ")) { + diff_is_binary = 0; + before = -1; + } + continue; + } + + /* Looking for a valid hunk header? */ + if (before == 0 && after == 0) { + if (starts_with(line, "@@ -")) { + /* Parse next hunk, but ignore line numbers. */ + scan_hunk_header(line, &before, &after); + continue; + } + + /* Split at the end of the patch. */ + if (!starts_with(line, "diff ")) + break; + + /* Else we're parsing another header. */ + if (stable) + flush_one_hunk(result, &ctx); + before = after = -1; + } + + /* If we get here, we're inside a hunk. */ + if (line[0] == '-' || line[0] == ' ') + before--; + if (line[0] == '+' || line[0] == ' ') + after--; + + /* Add line to hash algo (possibly removing whitespace) */ + len = verbatim ? strlen(line) : remove_space(line); + patchlen += len; + the_hash_algo->update_fn(&ctx, line, len); + } + + if (!found_next) + oidclr(next_oid); + + flush_one_hunk(result, &ctx); + + return patchlen; +} + +static void generate_id_list(int stable, int verbatim) +{ + struct object_id oid, n, result; + int patchlen; + struct strbuf line_buf = STRBUF_INIT; + + oidclr(&oid); + while (!feof(stdin)) { + patchlen = get_one_patchid(&n, &result, &line_buf, stable, verbatim); + flush_current_id(patchlen, &oid, &result); + oidcpy(&oid, &n); + } + strbuf_release(&line_buf); +} + +static const char *const patch_id_usage[] = { + N_("git patch-id [--stable | --unstable | --verbatim]"), NULL +}; + +struct patch_id_opts { + int stable; + int verbatim; +}; + +static int git_patch_id_config(const char *var, const char *value, void *cb) +{ + struct patch_id_opts *opts = cb; + + if (!strcmp(var, "patchid.stable")) { + opts->stable = git_config_bool(var, value); + return 0; + } + if (!strcmp(var, "patchid.verbatim")) { + opts->verbatim = git_config_bool(var, value); + return 0; + } + + return git_default_config(var, value, cb); +} + +int cmd_patch_id(int argc, const char **argv, const char *prefix) +{ + /* if nothing is set, default to unstable */ + struct patch_id_opts config = {0, 0}; + int opts = 0; + struct option builtin_patch_id_options[] = { + OPT_CMDMODE(0, "unstable", &opts, + N_("use the unstable patch-id algorithm"), 1), + OPT_CMDMODE(0, "stable", &opts, + N_("use the stable patch-id algorithm"), 2), + OPT_CMDMODE(0, "verbatim", &opts, + N_("don't strip whitespace from the patch"), 3), + OPT_END() + }; + + git_config(git_patch_id_config, &config); + + /* verbatim implies stable */ + if (config.verbatim) + config.stable = 1; + + argc = parse_options(argc, argv, prefix, builtin_patch_id_options, + patch_id_usage, 0); + + generate_id_list(opts ? opts > 1 : config.stable, + opts ? opts == 3 : config.verbatim); + return 0; +} |