blob: 483d6e019bbe995194f94f551da2d80348747cc3 [file] [log] [blame]
* libgit2 "rev-parse" example - shows how to parse revspecs
* Written by the libgit2 contributors
* To the extent possible under law, the author(s) have dedicated all copyright
* and related and neighboring rights to this software to the public domain
* worldwide. This software is distributed without any warranty.
* You should have received a copy of the CC0 Public Domain Dedication along
* with this software. If not, see
* <>.
#include "common.h"
/** Forward declarations for helpers. */
struct parse_state {
git_repository *repo;
const char *repodir;
const char *spec;
int not;
static void parse_opts(struct parse_state *ps, int argc, char *argv[]);
static int parse_revision(struct parse_state *ps);
int main(int argc, char *argv[])
struct parse_state ps = {0};
parse_opts(&ps, argc, argv);
check_lg2(parse_revision(&ps), "Parsing", NULL);
return 0;
static void usage(const char *message, const char *arg)
if (message && arg)
fprintf(stderr, "%s: %s\n", message, arg);
else if (message)
fprintf(stderr, "%s\n", message);
fprintf(stderr, "usage: rev-parse [ --option ] <args>...\n");
static void parse_opts(struct parse_state *ps, int argc, char *argv[])
struct args_info args = ARGS_INFO_INIT;
for (args.pos=1; args.pos < argc; ++args.pos) {
const char *a = argv[args.pos];
if (a[0] != '-') {
if (ps->spec)
usage("Too many specs", a);
ps->spec = a;
} else if (!strcmp(a, "--not"))
ps->not = !ps->not;
else if (!match_str_arg(&ps->repodir, &args, "--git-dir"))
usage("Cannot handle argument", a);
static int parse_revision(struct parse_state *ps)
git_revspec rs;
char str[GIT_OID_HEXSZ + 1];
if (!ps->repo) {
if (!ps->repodir)
ps->repodir = ".";
check_lg2(git_repository_open_ext(&ps->repo, ps->repodir, 0, NULL),
"Could not open repository from", ps->repodir);
check_lg2(git_revparse(&rs, ps->repo, ps->spec), "Could not parse", ps->spec);
if ((rs.flags & GIT_REVPARSE_SINGLE) != 0) {
git_oid_tostr(str, sizeof(str), git_object_id(rs.from));
printf("%s\n", str);
else if ((rs.flags & GIT_REVPARSE_RANGE) != 0) {
git_oid_tostr(str, sizeof(str), git_object_id(;
printf("%s\n", str);
if ((rs.flags & GIT_REVPARSE_MERGE_BASE) != 0) {
git_oid base;
check_lg2(git_merge_base(&base, ps->repo,
git_object_id(rs.from), git_object_id(,
"Could not find merge base", ps->spec);
git_oid_tostr(str, sizeof(str), &base);
printf("%s\n", str);
git_oid_tostr(str, sizeof(str), git_object_id(rs.from));
printf("^%s\n", str);
else {
fatal("Invalid results from git_revparse", ps->spec);
return 0;