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#include <stdio.h>
#include <git2.h>
#include <stdlib.h>
#include <string.h>
static void check(int error, const char *message, const char *arg)
{
if (!error)
return;
if (arg)
fprintf(stderr, "%s %s (%d)\n", message, arg, error);
else
fprintf(stderr, "%s(%d)\n", message, error);
exit(1);
}
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");
exit(1);
}
struct parse_state {
git_repository *repo;
const char *repodir;
int not;
};
static int parse_revision(struct parse_state *ps, const char *revstr)
{
git_revspec rs;
char str[GIT_OID_HEXSZ + 1];
if (!ps->repo) {
if (!ps->repodir)
ps->repodir = ".";
check(git_repository_open_ext(&ps->repo, ps->repodir, 0, NULL),
"Could not open repository from", ps->repodir);
}
check(git_revparse(&rs, ps->repo, revstr), "Could not parse", revstr);
if ((rs.flags & GIT_REVPARSE_SINGLE) != 0) {
git_oid_tostr(str, sizeof(str), git_object_id(rs.from));
printf("%s\n", str);
git_object_free(rs.from);
}
else if ((rs.flags & GIT_REVPARSE_RANGE) != 0) {
git_oid_tostr(str, sizeof(str), git_object_id(rs.to));
printf("%s\n", str);
git_object_free(rs.to);
if ((rs.flags & GIT_REVPARSE_MERGE_BASE) != 0) {
git_oid base;
check(git_merge_base(&base, ps->repo,
git_object_id(rs.from), git_object_id(rs.to)),
"Could not find merge base", revstr);
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);
git_object_free(rs.from);
}
else {
check(0, "Invalid results from git_revparse", revstr);
}
return 0;
}
int main(int argc, char *argv[])
{
int i;
char *a;
struct parse_state ps;
git_threads_init();
memset(&ps, 0, sizeof(ps));
for (i = 1; i < argc; ++i) {
a = argv[i];
if (a[0] != '-') {
if (parse_revision(&ps, a) != 0)
break;
} else if (!strcmp(a, "--not"))
ps.not = !ps.not;
else if (!strncmp(a, "--git-dir=", strlen("--git-dir=")))
ps.repodir = a + strlen("--git-dir=");
else
usage("Cannot handle argument", a);
}
git_repository_free(ps.repo);
git_threads_shutdown();
return 0;
}
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