mirror of
https://git.proxmox.com/git/libgit2
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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.
320 lines
7.7 KiB
C
320 lines
7.7 KiB
C
/*
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* libgit2 "tag" example - shows how to list, create and delete tags
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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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/**
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* The following example partially reimplements the `git tag` command
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* and some of its options.
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*
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* These commands should work:
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* - Tag name listing (`tag`)
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* - Filtered tag listing with messages (`tag -n3 -l "v0.1*"`)
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* - Lightweight tag creation (`tag test v0.18.0`)
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* - Tag creation (`tag -a -m "Test message" test v0.18.0`)
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* - Tag deletion (`tag -d test`)
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*
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* The command line parsing logic is simplified and doesn't handle
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* all of the use cases.
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*/
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/** tag_options represents the parsed command line options */
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typedef struct {
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const char *message;
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const char *pattern;
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const char *tag_name;
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const char *target;
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int num_lines;
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int force;
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} tag_options;
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/** tag_state represents the current program state for dragging around */
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typedef struct {
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git_repository *repo;
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tag_options *opts;
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} tag_state;
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/** An action to execute based on the command line arguments */
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typedef void (*tag_action)(tag_state *state);
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typedef struct args_info args_info;
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static void check(int result, const char *message)
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{
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if (result) fatal(message, NULL);
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}
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/** Tag listing: Print individual message lines */
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static void print_list_lines(const char *message, const tag_state *state)
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{
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const char *msg = message;
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int num = state->opts->num_lines - 1;
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if (!msg) return;
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/** first line - headline */
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while(*msg && *msg != '\n') printf("%c", *msg++);
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/** skip over new lines */
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while(*msg && *msg == '\n') msg++;
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printf("\n");
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/** print just headline? */
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if (num == 0) return;
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if (*msg && msg[1]) printf("\n");
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/** print individual commit/tag lines */
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while (*msg && num-- >= 2) {
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printf(" ");
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while (*msg && *msg != '\n') printf("%c", *msg++);
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/** handle consecutive new lines */
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if (*msg && *msg == '\n' && msg[1] == '\n') {
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num--;
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printf("\n");
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}
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while(*msg && *msg == '\n') msg++;
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printf("\n");
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}
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}
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/** Tag listing: Print an actual tag object */
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static void print_tag(git_tag *tag, const tag_state *state)
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{
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printf("%-16s", git_tag_name(tag));
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if (state->opts->num_lines) {
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const char *msg = git_tag_message(tag);
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print_list_lines(msg, state);
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} else {
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printf("\n");
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}
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}
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/** Tag listing: Print a commit (target of a lightweight tag) */
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static void print_commit(git_commit *commit, const char *name,
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const tag_state *state)
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{
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printf("%-16s", name);
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if (state->opts->num_lines) {
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const char *msg = git_commit_message(commit);
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print_list_lines(msg, state);
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} else {
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printf("\n");
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}
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}
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/** Tag listing: Fallback, should not happen */
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static void print_name(const char *name)
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{
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printf("%s\n", name);
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}
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/** Tag listing: Lookup tags based on ref name and dispatch to print */
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static int each_tag(const char *name, tag_state *state)
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{
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git_repository *repo = state->repo;
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git_object *obj;
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check_lg2(git_revparse_single(&obj, repo, name),
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"Failed to lookup rev", name);
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switch (git_object_type(obj)) {
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case GIT_OBJ_TAG:
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print_tag((git_tag *) obj, state);
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break;
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case GIT_OBJ_COMMIT:
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print_commit((git_commit *) obj, name, state);
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break;
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default:
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print_name(name);
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}
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git_object_free(obj);
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return 0;
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}
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static void action_list_tags(tag_state *state)
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{
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const char *pattern = state->opts->pattern;
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git_strarray tag_names = {0};
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size_t i;
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check_lg2(git_tag_list_match(&tag_names, pattern ? pattern : "*", state->repo),
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"Unable to get list of tags", NULL);
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for(i = 0; i < tag_names.count; i++) {
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each_tag(tag_names.strings[i], state);
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}
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git_strarray_free(&tag_names);
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}
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static void action_delete_tag(tag_state *state)
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{
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tag_options *opts = state->opts;
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git_object *obj;
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git_buf abbrev_oid = {0};
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check(!opts->tag_name, "Name required");
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check_lg2(git_revparse_single(&obj, state->repo, opts->tag_name),
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"Failed to lookup rev", opts->tag_name);
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check_lg2(git_object_short_id(&abbrev_oid, obj),
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"Unable to get abbreviated OID", opts->tag_name);
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check_lg2(git_tag_delete(state->repo, opts->tag_name),
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"Unable to delete tag", opts->tag_name);
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printf("Deleted tag '%s' (was %s)\n", opts->tag_name, abbrev_oid.ptr);
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git_buf_free(&abbrev_oid);
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git_object_free(obj);
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}
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static void action_create_lighweight_tag(tag_state *state)
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{
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git_repository *repo = state->repo;
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tag_options *opts = state->opts;
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git_oid oid;
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git_object *target;
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check(!opts->tag_name, "Name required");
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if (!opts->target) opts->target = "HEAD";
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check(!opts->target, "Target required");
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check_lg2(git_revparse_single(&target, repo, opts->target),
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"Unable to resolve spec", opts->target);
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check_lg2(git_tag_create_lightweight(&oid, repo, opts->tag_name,
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target, opts->force), "Unable to create tag", NULL);
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git_object_free(target);
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}
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static void action_create_tag(tag_state *state)
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{
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git_repository *repo = state->repo;
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tag_options *opts = state->opts;
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git_signature *tagger;
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git_oid oid;
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git_object *target;
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check(!opts->tag_name, "Name required");
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check(!opts->message, "Message required");
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if (!opts->target) opts->target = "HEAD";
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check_lg2(git_revparse_single(&target, repo, opts->target),
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"Unable to resolve spec", opts->target);
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check_lg2(git_signature_default(&tagger, repo),
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"Unable to create signature", NULL);
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check_lg2(git_tag_create(&oid, repo, opts->tag_name,
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target, tagger, opts->message, opts->force), "Unable to create tag", NULL);
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git_object_free(target);
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git_signature_free(tagger);
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}
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static void print_usage(void)
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{
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fprintf(stderr, "usage: see `git help tag`\n");
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exit(1);
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}
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/** Parse command line arguments and choose action to run when done */
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static void parse_options(tag_action *action, tag_options *opts, int argc, char **argv)
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{
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args_info args = ARGS_INFO_INIT;
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*action = &action_list_tags;
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for (args.pos = 1; args.pos < argc; ++args.pos) {
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const char *curr = argv[args.pos];
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if (curr[0] != '-') {
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if (!opts->tag_name)
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opts->tag_name = curr;
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else if (!opts->target)
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opts->target = curr;
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else
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print_usage();
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if (*action != &action_create_tag)
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*action = &action_create_lighweight_tag;
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} else if (!strcmp(curr, "-n")) {
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opts->num_lines = 1;
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*action = &action_list_tags;
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} else if (!strcmp(curr, "-a")) {
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*action = &action_create_tag;
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} else if (!strcmp(curr, "-f")) {
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opts->force = 1;
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} else if (match_int_arg(&opts->num_lines, &args, "-n", 0)) {
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*action = &action_list_tags;
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} else if (match_str_arg(&opts->pattern, &args, "-l")) {
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*action = &action_list_tags;
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} else if (match_str_arg(&opts->tag_name, &args, "-d")) {
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*action = &action_delete_tag;
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} else if (match_str_arg(&opts->message, &args, "-m")) {
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*action = &action_create_tag;
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}
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}
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}
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/** Initialize tag_options struct */
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static void tag_options_init(tag_options *opts)
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{
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memset(opts, 0, sizeof(*opts));
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opts->message = NULL;
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opts->pattern = NULL;
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opts->tag_name = NULL;
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opts->target = NULL;
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opts->num_lines = 0;
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opts->force = 0;
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}
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int main(int argc, char **argv)
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{
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git_repository *repo;
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tag_options opts;
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tag_action action;
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tag_state state;
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git_libgit2_init();
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check_lg2(git_repository_open_ext(&repo, ".", 0, NULL),
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"Could not open repository", NULL);
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tag_options_init(&opts);
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parse_options(&action, &opts, argc, argv);
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state.repo = repo;
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state.opts = &opts;
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action(&state);
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git_repository_free(repo);
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git_libgit2_shutdown();
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return 0;
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}
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