mirror of
https://git.proxmox.com/git/libgit2
synced 2025-05-02 10:01:12 +00:00
799e22ea0c
This describes their purpose better, as we now initialize ssl and some other global stuff in there. Calling the init function is not something which has been optional for a while now.
116 lines
2.8 KiB
C
116 lines
2.8 KiB
C
/*
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* libgit2 "rev-parse" example - shows how to parse revspecs
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*
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* Written by the libgit2 contributors
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*
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* To the extent possible under law, the author(s) have dedicated all copyright
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* and related and neighboring rights to this software to the public domain
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* worldwide. This software is distributed without any warranty.
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*
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* You should have received a copy of the CC0 Public Domain Dedication along
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* with this software. If not, see
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* <http://creativecommons.org/publicdomain/zero/1.0/>.
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*/
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#include "common.h"
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/** Forward declarations for helpers. */
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struct parse_state {
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git_repository *repo;
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const char *repodir;
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const char *spec;
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int not;
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};
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static void parse_opts(struct parse_state *ps, int argc, char *argv[]);
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static int parse_revision(struct parse_state *ps);
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int main(int argc, char *argv[])
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{
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struct parse_state ps = {0};
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git_libgit2_init();
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parse_opts(&ps, argc, argv);
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check_lg2(parse_revision(&ps), "Parsing", NULL);
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git_repository_free(ps.repo);
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git_libgit2_shutdown();
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return 0;
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}
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static void usage(const char *message, const char *arg)
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{
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if (message && arg)
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fprintf(stderr, "%s: %s\n", message, arg);
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else if (message)
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fprintf(stderr, "%s\n", message);
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fprintf(stderr, "usage: rev-parse [ --option ] <args>...\n");
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exit(1);
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}
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static void parse_opts(struct parse_state *ps, int argc, char *argv[])
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{
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struct args_info args = ARGS_INFO_INIT;
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for (args.pos=1; args.pos < argc; ++args.pos) {
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const char *a = argv[args.pos];
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if (a[0] != '-') {
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if (ps->spec)
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usage("Too many specs", a);
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ps->spec = a;
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} else if (!strcmp(a, "--not"))
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ps->not = !ps->not;
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else if (!match_str_arg(&ps->repodir, &args, "--git-dir"))
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usage("Cannot handle argument", a);
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}
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}
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static int parse_revision(struct parse_state *ps)
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{
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git_revspec rs;
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char str[GIT_OID_HEXSZ + 1];
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if (!ps->repo) {
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if (!ps->repodir)
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ps->repodir = ".";
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check_lg2(git_repository_open_ext(&ps->repo, ps->repodir, 0, NULL),
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"Could not open repository from", ps->repodir);
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}
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check_lg2(git_revparse(&rs, ps->repo, ps->spec), "Could not parse", ps->spec);
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if ((rs.flags & GIT_REVPARSE_SINGLE) != 0) {
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git_oid_tostr(str, sizeof(str), git_object_id(rs.from));
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printf("%s\n", str);
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git_object_free(rs.from);
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}
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else if ((rs.flags & GIT_REVPARSE_RANGE) != 0) {
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git_oid_tostr(str, sizeof(str), git_object_id(rs.to));
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printf("%s\n", str);
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git_object_free(rs.to);
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if ((rs.flags & GIT_REVPARSE_MERGE_BASE) != 0) {
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git_oid base;
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check_lg2(git_merge_base(&base, ps->repo,
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git_object_id(rs.from), git_object_id(rs.to)),
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"Could not find merge base", ps->spec);
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git_oid_tostr(str, sizeof(str), &base);
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printf("%s\n", str);
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}
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git_oid_tostr(str, sizeof(str), git_object_id(rs.from));
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printf("^%s\n", str);
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git_object_free(rs.from);
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}
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else {
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fatal("Invalid results from git_revparse", ps->spec);
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}
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return 0;
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}
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