diff options
Diffstat (limited to 'builtin/name-rev.c')
| -rw-r--r-- | builtin/name-rev.c | 305 |
1 files changed, 305 insertions, 0 deletions
diff --git a/builtin/name-rev.c b/builtin/name-rev.c new file mode 100644 index 0000000..06a38ac --- /dev/null +++ b/builtin/name-rev.c @@ -0,0 +1,305 @@ +#include "builtin.h" +#include "cache.h" +#include "commit.h" +#include "tag.h" +#include "refs.h" +#include "parse-options.h" + +#define CUTOFF_DATE_SLOP 86400 /* one day */ + +typedef struct rev_name { + const char *tip_name; + int generation; + int distance; +} rev_name; + +static long cutoff = LONG_MAX; + +/* How many generations are maximally preferred over _one_ merge traversal? */ +#define MERGE_TRAVERSAL_WEIGHT 65535 + +static void name_rev(struct commit *commit, + const char *tip_name, int generation, int distance, + int deref) +{ + struct rev_name *name = (struct rev_name *)commit->util; + struct commit_list *parents; + int parent_number = 1; + + if (!commit->object.parsed) + parse_commit(commit); + + if (commit->date < cutoff) + return; + + if (deref) { + char *new_name = xmalloc(strlen(tip_name)+3); + strcpy(new_name, tip_name); + strcat(new_name, "^0"); + tip_name = new_name; + + if (generation) + die("generation: %d, but deref?", generation); + } + + if (name == NULL) { + name = xmalloc(sizeof(rev_name)); + commit->util = name; + goto copy_data; + } else if (name->distance > distance) { +copy_data: + name->tip_name = tip_name; + name->generation = generation; + name->distance = distance; + } else + return; + + for (parents = commit->parents; + parents; + parents = parents->next, parent_number++) { + if (parent_number > 1) { + int len = strlen(tip_name); + char *new_name = xmalloc(len + + 1 + decimal_length(generation) + /* ~<n> */ + 1 + 2 + /* ^NN */ + 1); + + if (len > 2 && !strcmp(tip_name + len - 2, "^0")) + len -= 2; + if (generation > 0) + sprintf(new_name, "%.*s~%d^%d", len, tip_name, + generation, parent_number); + else + sprintf(new_name, "%.*s^%d", len, tip_name, + parent_number); + + name_rev(parents->item, new_name, 0, + distance + MERGE_TRAVERSAL_WEIGHT, 0); + } else { + name_rev(parents->item, tip_name, generation + 1, + distance + 1, 0); + } + } +} + +struct name_ref_data { + int tags_only; + int name_only; + const char *ref_filter; +}; + +static int name_ref(const char *path, const unsigned char *sha1, int flags, void *cb_data) +{ + struct object *o = parse_object(sha1); + struct name_ref_data *data = cb_data; + int deref = 0; + + if (data->tags_only && prefixcmp(path, "refs/tags/")) + return 0; + + if (data->ref_filter && fnmatch(data->ref_filter, path, 0)) + return 0; + + while (o && o->type == OBJ_TAG) { + struct tag *t = (struct tag *) o; + if (!t->tagged) + break; /* broken repository */ + o = parse_object(t->tagged->sha1); + deref = 1; + } + if (o && o->type == OBJ_COMMIT) { + struct commit *commit = (struct commit *)o; + + if (!prefixcmp(path, "refs/heads/")) + path = path + 11; + else if (data->tags_only + && data->name_only + && !prefixcmp(path, "refs/tags/")) + path = path + 10; + else if (!prefixcmp(path, "refs/")) + path = path + 5; + + name_rev(commit, xstrdup(path), 0, 0, deref); + } + return 0; +} + +/* returns a static buffer */ +static const char *get_rev_name(const struct object *o) +{ + static char buffer[1024]; + struct rev_name *n; + struct commit *c; + + if (o->type != OBJ_COMMIT) + return NULL; + c = (struct commit *) o; + n = c->util; + if (!n) + return NULL; + + if (!n->generation) + return n->tip_name; + else { + int len = strlen(n->tip_name); + if (len > 2 && !strcmp(n->tip_name + len - 2, "^0")) + len -= 2; + snprintf(buffer, sizeof(buffer), "%.*s~%d", len, n->tip_name, + n->generation); + + return buffer; + } +} + +static void show_name(const struct object *obj, + const char *caller_name, + int always, int allow_undefined, int name_only) +{ + const char *name; + const unsigned char *sha1 = obj->sha1; + + if (!name_only) + printf("%s ", caller_name ? caller_name : sha1_to_hex(sha1)); + name = get_rev_name(obj); + if (name) + printf("%s\n", name); + else if (allow_undefined) + printf("undefined\n"); + else if (always) + printf("%s\n", find_unique_abbrev(sha1, DEFAULT_ABBREV)); + else + die("cannot describe '%s'", sha1_to_hex(sha1)); +} + +static char const * const name_rev_usage[] = { + "git name-rev [options] ( --all | --stdin | <commit>... )", + NULL +}; + +static void name_rev_line(char *p, struct name_ref_data *data) +{ + int forty = 0; + char *p_start; + for (p_start = p; *p; p++) { +#define ishex(x) (isdigit((x)) || ((x) >= 'a' && (x) <= 'f')) + if (!ishex(*p)) + forty = 0; + else if (++forty == 40 && + !ishex(*(p+1))) { + unsigned char sha1[40]; + const char *name = NULL; + char c = *(p+1); + int p_len = p - p_start + 1; + + forty = 0; + + *(p+1) = 0; + if (!get_sha1(p - 39, sha1)) { + struct object *o = + lookup_object(sha1); + if (o) + name = get_rev_name(o); + } + *(p+1) = c; + + if (!name) + continue; + + if (data->name_only) + printf("%.*s%s", p_len - 40, p_start, name); + else + printf("%.*s (%s)", p_len, p_start, name); + p_start = p + 1; + } + } + + /* flush */ + if (p_start != p) + fwrite(p_start, p - p_start, 1, stdout); +} + +int cmd_name_rev(int argc, const char **argv, const char *prefix) +{ + struct object_array revs = { 0, 0, NULL }; + int all = 0, transform_stdin = 0, allow_undefined = 1, always = 0; + struct name_ref_data data = { 0, 0, NULL }; + struct option opts[] = { + OPT_BOOLEAN(0, "name-only", &data.name_only, "print only names (no SHA-1)"), + OPT_BOOLEAN(0, "tags", &data.tags_only, "only use tags to name the commits"), + OPT_STRING(0, "refs", &data.ref_filter, "pattern", + "only use refs matching <pattern>"), + OPT_GROUP(""), + OPT_BOOLEAN(0, "all", &all, "list all commits reachable from all refs"), + OPT_BOOLEAN(0, "stdin", &transform_stdin, "read from stdin"), + OPT_BOOLEAN(0, "undefined", &allow_undefined, "allow to print `undefined` names"), + OPT_BOOLEAN(0, "always", &always, + "show abbreviated commit object as fallback"), + OPT_END(), + }; + + git_config(git_default_config, NULL); + argc = parse_options(argc, argv, prefix, opts, name_rev_usage, 0); + if (!!all + !!transform_stdin + !!argc > 1) { + error("Specify either a list, or --all, not both!"); + usage_with_options(name_rev_usage, opts); + } + if (all || transform_stdin) + cutoff = 0; + + for (; argc; argc--, argv++) { + unsigned char sha1[20]; + struct object *o; + struct commit *commit; + + if (get_sha1(*argv, sha1)) { + fprintf(stderr, "Could not get sha1 for %s. Skipping.\n", + *argv); + continue; + } + + o = deref_tag(parse_object(sha1), *argv, 0); + if (!o || o->type != OBJ_COMMIT) { + fprintf(stderr, "Could not get commit for %s. Skipping.\n", + *argv); + continue; + } + + commit = (struct commit *)o; + if (cutoff > commit->date) + cutoff = commit->date; + add_object_array((struct object *)commit, *argv, &revs); + } + + if (cutoff) + cutoff = cutoff - CUTOFF_DATE_SLOP; + for_each_ref(name_ref, &data); + + if (transform_stdin) { + char buffer[2048]; + + while (!feof(stdin)) { + char *p = fgets(buffer, sizeof(buffer), stdin); + if (!p) + break; + name_rev_line(p, &data); + } + } else if (all) { + int i, max; + + max = get_max_object_index(); + for (i = 0; i < max; i++) { + struct object *obj = get_indexed_object(i); + if (!obj) + continue; + show_name(obj, NULL, + always, allow_undefined, data.name_only); + } + } else { + int i; + for (i = 0; i < revs.nr; i++) + show_name(revs.objects[i].item, revs.objects[i].name, + always, allow_undefined, data.name_only); + } + + return 0; +} |