diff options
| -rw-r--r-- | Documentation/git-name-rev.txt | 66 | ||||
| -rw-r--r-- | Makefile | 2 | ||||
| -rw-r--r-- | name-rev.c | 246 |
3 files changed, 313 insertions, 1 deletions
diff --git a/Documentation/git-name-rev.txt b/Documentation/git-name-rev.txt new file mode 100644 index 0000000000..e37b0b8f97 --- /dev/null +++ b/Documentation/git-name-rev.txt @@ -0,0 +1,66 @@ +git-name-rev(1) +=============== + +NAME +---- +git-name-rev - Find symbolic names for given revs. + + +SYNOPSIS +-------- +'git-name-rev' [--tags] ( --all | --stdin | <commitish>... ) + +DESCRIPTION +----------- +Finds symbolic names suitable for human digestion for revisions given in any +format parsable by git-rev-parse. + + +OPTIONS +------- + +--tags:: + Do not use branch names, but only tags to name the commits + +--all:: + List all commits reachable from all refs + +--stdin:: + Read from stdin, append "(<rev_name>)" to all sha1's of name'able + commits, and pass to stdout + +EXAMPLE +------- + +Given a commit, find out where it is relative to the local refs. Say somebody +wrote you about that phantastic commit 33db5f4d9027a10e477ccf054b2c1ab94f74c85a. +Of course, you look into the commit, but that only tells you what happened, but +not the context. + +Enter git-name-rev: + +------------ +% git name-rev 33db5f4d9027a10e477ccf054b2c1ab94f74c85a +------------ + +Now you are wiser, because you know that it happened 940 revisions before v0.99. + +Another nice thing you can do is: + +------------ +% git log | git name-rev --stdin +------------ + + +Author +------ +Written by Johannes Schindelin <Johannes.Schindelin@gmx.de> + +Documentation +-------------- +Documentation by Johannes Schindelin. + +GIT +--- +Part of the gitlink:git[7] suite + @@ -122,7 +122,7 @@ PROGRAMS = \ git-unpack-objects$X git-update-index$X git-update-server-info$X \ git-upload-pack$X git-verify-pack$X git-write-tree$X \ git-update-ref$X git-symbolic-ref$X git-check-ref-format$X \ - $(SIMPLE_PROGRAMS) + git-name-rev$X $(SIMPLE_PROGRAMS) # Backward compatibility -- to be removed after 1.0 PROGRAMS += git-ssh-pull$X git-ssh-push$X diff --git a/name-rev.c b/name-rev.c new file mode 100644 index 0000000000..21fecdf542 --- /dev/null +++ b/name-rev.c @@ -0,0 +1,246 @@ +#include <stdlib.h> +#include "cache.h" +#include "commit.h" +#include "tag.h" +#include "refs.h" + +static const char name_rev_usage[] = + "git-name-rev [--tags] ( --all | --stdin | commitish [commitish...] )\n"; + +typedef struct rev_name { + const char *tip_name; + int merge_traversals; + int generation; +} rev_name; + +static long cutoff = LONG_MAX; + +static void name_rev(struct commit *commit, + const char *tip_name, int merge_traversals, int generation, + int deref) +{ + struct rev_name *name = (struct rev_name *)commit->object.util; + struct commit_list *parents; + int parent_number = 0; + + 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->object.util = name; + goto copy_data; + } else if (name->merge_traversals > merge_traversals || + (name->merge_traversals == merge_traversals && + name->generation > generation)) { +copy_data: + name->tip_name = tip_name; + name->merge_traversals = merge_traversals; + name->generation = generation; + } else + return; + + for (parents = commit->parents; + parents; + parents = parents->next, parent_number++) { + if (parent_number > 0) { + char *new_name = xmalloc(strlen(tip_name)+8); + + if (generation > 0) + sprintf(new_name, "%s~%d^%d", tip_name, + generation, parent_number); + else + sprintf(new_name, "%s^%d", tip_name, parent_number); + + name_rev(parents->item, new_name, + merge_traversals + 1 , 0, 0); + } else { + name_rev(parents->item, tip_name, merge_traversals, + generation + 1, 0); + } + } +} + +static int tags_only = 0; + +static int name_ref(const char *path, const unsigned char *sha1) +{ + struct object *o = parse_object(sha1); + int deref = 0; + + if (tags_only && strncmp(path, "refs/tags/", 10)) + return 0; + + while (o && o->type == tag_type) { + struct tag *t = (struct tag *) o; + if (!t->tagged) + break; /* broken repository */ + o = parse_object(t->tagged->sha1); + deref = 1; + } + if (o && o->type == commit_type) { + struct commit *commit = (struct commit *)o; + const char *p; + + while ((p = strchr(path, '/'))) + path = p+1; + + name_rev(commit, strdup(path), 0, 0, deref); + } + return 0; +} + +/* returns a static buffer */ +static const char* get_rev_name(struct object *o) +{ + static char buffer[1024]; + struct rev_name *n = (struct rev_name *)o->util; + if (!n) + return "undefined"; + + if (!n->generation) + return n->tip_name; + + snprintf(buffer, sizeof(buffer), "%s~%d", n->tip_name, n->generation); + + return buffer; +} + +int main(int argc, char **argv) +{ + struct object_list *revs = NULL; + struct object_list **walker = &revs; + int as_is = 0, all = 0, transform_stdin = 0; + + setup_git_directory(); + + if (argc < 2) + usage(name_rev_usage); + + for (--argc, ++argv; argc; --argc, ++argv) { + unsigned char sha1[20]; + struct object *o; + struct commit *commit; + + if (!as_is && (*argv)[0] == '-') { + if (!strcmp(*argv, "--")) { + as_is = 1; + continue; + } else if (!strcmp(*argv, "--tags")) { + tags_only = 1; + continue; + } else if (!strcmp(*argv, "--all")) { + if (argc > 1) + die("Specify either a list, or --all, not both!"); + all = 1; + cutoff = 0; + continue; + } else if (!strcmp(*argv, "--stdin")) { + if (argc > 1) + die("Specify either a list, or --stdin, not both!"); + transform_stdin = 1; + cutoff = 0; + continue; + } + usage(name_rev_usage); + } + + if (get_sha1(*argv, sha1)) { + fprintf(stderr, "Could not get sha1 for %s. Skipping.\n", + *argv); + continue; + } + + o = deref_tag(parse_object(sha1)); + if (!o || o->type != commit_type) { + fprintf(stderr, "Could not get commit for %s. Skipping.\n", + *argv); + continue; + } + + commit = (struct commit *)o; + + if (cutoff > commit->date) + cutoff = commit->date; + + object_list_append((struct object *)commit, walker); + (*walker)->name = *argv; + walker = &((*walker)->next); + } + + for_each_ref(name_ref); + + if (transform_stdin) { + char buffer[2048]; + char *p, *p_start; + + while (!feof(stdin)) { + int forty = 0; + p = fgets(buffer, sizeof(buffer), stdin); + if (!p) + break; + + 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 = "undefined"; + char c = *(p+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 (!strcmp(name, "undefined")) + continue; + + fwrite(p_start, p - p_start, 1, stdout); + fputc('(', stdout); + fputs(name, stdout); + fputc(')', stdout); + p_start = p + 1; + } + } + + /* flush */ + if (p_start != p) + fwrite(p_start, p - p_start, 1, stdout); + } + } else if (all) { + extern struct object **objs; + extern int nr_objs; + int i; + + for (i = 0; i < nr_objs; i++) + printf("%s %s\n", sha1_to_hex(objs[i]->sha1), + get_rev_name(objs[i])); + } else + for ( ; revs; revs = revs->next) + printf("%s %s\n", revs->name, get_rev_name(revs->item)); + + return 0; +} + |