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/*
* 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
* <http://creativecommons.org/publicdomain/zero/1.0/>.
*/
#include "common.h"
/** Forward declarations for helpers. */
struct parse_state {
const char *repodir;
const char *spec;
int not;
};
static void parse_opts(struct parse_state *ps, int argc, char *argv[]);
static int parse_revision(git_repository *repo, struct parse_state *ps);
int lg2_rev_parse(git_repository *repo, int argc, char *argv[])
{
struct parse_state ps = {0};
parse_opts(&ps, argc, argv);
check_lg2(parse_revision(repo, &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");
exit(1);
}
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(git_repository *repo, struct parse_state *ps)
{
git_revspec rs;
char str[GIT_OID_SHA1_HEXSIZE + 1];
check_lg2(git_revparse(&rs, repo, ps->spec), "Could not parse", ps->spec);
if ((rs.flags & GIT_REVSPEC_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_REVSPEC_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_REVSPEC_MERGE_BASE) != 0) {
git_oid base;
check_lg2(git_merge_base(&base, repo,
git_object_id(rs.from), git_object_id(rs.to)),
"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);
git_object_free(rs.from);
}
else {
fatal("Invalid results from git_revparse", ps->spec);
}
return 0;
}
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