libgit2/examples/tag.c at executable · novalis/libgit2 · GitHub

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* libgit2 "tag" example - shows how to list, create and delete tags

* 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"

/**

* The following example partially reimplements the `git tag` command

* and some of its options.

* These commands should work:

* - Tag name listing (`tag`)

* - Filtered tag listing with messages (`tag -n3 -l "v0.1*"`)

* - Lightweight tag creation (`tag test v0.18.0`)

* - Tag creation (`tag -a -m "Test message" test v0.18.0`)

* - Tag deletion (`tag -d test`)

* The command line parsing logic is simplified and doesn't handle

* all of the use cases.

/** tag_options represents the parsed command line options */

struct tag_options {

const char *message;

const char *pattern;

const char *tag_name;

const char *target;

int num_lines;

int force;

};

/** tag_state represents the current program state for dragging around */

typedef struct {

git_repository *repo;

struct tag_options *opts;

} tag_state;

/** An action to execute based on the command line arguments */

typedef void (*tag_action)(tag_state *state);

typedef struct args_info args_info;

static void check(int result, const char *message)

{

if (result) fatal(message, NULL);

}

/** Tag listing: Print individual message lines */

static void print_list_lines(const char *message, const tag_state *state)

{

const char *msg = message;

int num = state->opts->num_lines - 1;

if (!msg) return;

/** first line - headline */

while(*msg && *msg != '\n') printf("%c", *msg++);

/** skip over new lines */

while(*msg && *msg == '\n') msg++;

printf("\n");

/** print just headline? */

if (num == 0) return;

if (*msg && msg[1]) printf("\n");

/** print individual commit/tag lines */

while (*msg && num-- >= 2) {

printf(" ");

while (*msg && *msg != '\n') printf("%c", *msg++);

/** handle consecutive new lines */

if (*msg && *msg == '\n' && msg[1] == '\n') {

num--;

printf("\n");

}

while(*msg && *msg == '\n') msg++;

printf("\n");

}

/** Tag listing: Print an actual tag object */

static void print_tag(git_tag *tag, const tag_state *state)

{

printf("%-16s", git_tag_name(tag));

if (state->opts->num_lines) {

const char *msg = git_tag_message(tag);

print_list_lines(msg, state);

} else {

printf("\n");

}

/** Tag listing: Print a commit (target of a lightweight tag) */

static void print_commit(git_commit *commit, const char *name,

const tag_state *state)

{

printf("%-16s", name);

if (state->opts->num_lines) {

const char *msg = git_commit_message(commit);

print_list_lines(msg, state);

} else {

printf("\n");

}

/** Tag listing: Fallback, should not happen */

static void print_name(const char *name)

{

printf("%s\n", name);

}

/** Tag listing: Lookup tags based on ref name and dispatch to print */

static int each_tag(const char *name, tag_state *state)

{

git_repository *repo = state->repo;

git_object *obj;

check_lg2(git_revparse_single(&obj, repo, name),

"Failed to lookup rev", name);

switch (git_object_type(obj)) {

case GIT_OBJECT_TAG:

print_tag((git_tag *) obj, state);

break;

case GIT_OBJECT_COMMIT:

print_commit((git_commit *) obj, name, state);

break;

default:

print_name(name);

}

git_object_free(obj);

return 0;

}

static void action_list_tags(tag_state *state)

{

const char *pattern = state->opts->pattern;

git_strarray tag_names = {0};

size_t i;

check_lg2(git_tag_list_match(&tag_names, pattern ? pattern : "*", state->repo),

"Unable to get list of tags", NULL);

for(i = 0; i < tag_names.count; i++) {

each_tag(tag_names.strings[i], state);

}

git_strarray_dispose(&tag_names);

}

static void action_delete_tag(tag_state *state)

{

struct tag_options *opts = state->opts;

git_object *obj;

git_buf abbrev_oid = {0};

check(!opts->tag_name, "Name required");

check_lg2(git_revparse_single(&obj, state->repo, opts->tag_name),

"Failed to lookup rev", opts->tag_name);

check_lg2(git_object_short_id(&abbrev_oid, obj),

"Unable to get abbreviated OID", opts->tag_name);

check_lg2(git_tag_delete(state->repo, opts->tag_name),

"Unable to delete tag", opts->tag_name);

printf("Deleted tag '%s' (was %s)\n", opts->tag_name, abbrev_oid.ptr);

git_buf_dispose(&abbrev_oid);

git_object_free(obj);

}

static void action_create_lightweight_tag(tag_state *state)

{

git_repository *repo = state->repo;

struct tag_options *opts = state->opts;

git_oid oid;

git_object *target;

check(!opts->tag_name, "Name required");

if (!opts->target) opts->target = "HEAD";

check(!opts->target, "Target required");

check_lg2(git_revparse_single(&target, repo, opts->target),

"Unable to resolve spec", opts->target);

check_lg2(git_tag_create_lightweight(&oid, repo, opts->tag_name,

target, opts->force), "Unable to create tag", NULL);

git_object_free(target);

}

static void action_create_tag(tag_state *state)

{

git_repository *repo = state->repo;

struct tag_options *opts = state->opts;

git_signature *tagger;

git_oid oid;

git_object *target;

check(!opts->tag_name, "Name required");

check(!opts->message, "Message required");

if (!opts->target) opts->target = "HEAD";

check_lg2(git_revparse_single(&target, repo, opts->target),

"Unable to resolve spec", opts->target);

check_lg2(git_signature_default(&tagger, repo),

"Unable to create signature", NULL);

check_lg2(git_tag_create(&oid, repo, opts->tag_name,

target, tagger, opts->message, opts->force), "Unable to create tag", NULL);

git_object_free(target);

git_signature_free(tagger);

}

static void print_usage(void)

{

fprintf(stderr, "usage: see `git help tag`\n");

exit(1);

}

/** Parse command line arguments and choose action to run when done */

static void parse_options(tag_action *action, struct tag_options *opts, int argc, char **argv)

{

args_info args = ARGS_INFO_INIT;

*action = &action_list_tags;

for (args.pos = 1; args.pos < argc; ++args.pos) {

const char *curr = argv[args.pos];

if (curr[0] != '-') {

if (!opts->tag_name)

opts->tag_name = curr;

else if (!opts->target)

opts->target = curr;

else

print_usage();

if (*action != &action_create_tag)

*action = &action_create_lightweight_tag;

} else if (!strcmp(curr, "-n")) {

opts->num_lines = 1;

*action = &action_list_tags;

} else if (!strcmp(curr, "-a")) {

*action = &action_create_tag;

} else if (!strcmp(curr, "-f")) {

opts->force = 1;

} else if (match_int_arg(&opts->num_lines, &args, "-n", 0)) {

*action = &action_list_tags;

} else if (match_str_arg(&opts->pattern, &args, "-l")) {

*action = &action_list_tags;

} else if (match_str_arg(&opts->tag_name, &args, "-d")) {

*action = &action_delete_tag;

} else if (match_str_arg(&opts->message, &args, "-m")) {

*action = &action_create_tag;

}

/** Initialize tag_options struct */

static void tag_options_init(struct tag_options *opts)

{

memset(opts, 0, sizeof(*opts));

opts->message = NULL;

opts->pattern = NULL;

opts->tag_name = NULL;

opts->target = NULL;

opts->num_lines = 0;

opts->force = 0;

}

int lg2_tag(git_repository *repo, int argc, char **argv)

{

struct tag_options opts;

tag_action action;

tag_state state;

tag_options_init(&opts);

parse_options(&action, &opts, argc, argv);

state.repo = repo;

state.opts = &opts;

action(&state);

return 0;

}

libgit2/examples/tag.c at executable · novalis/libgit2 · GitHub

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