thodg/libgit2/examples/rev-list.c

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• Hash : b43567d6
  Author :
  Date : 2022-07-13T22:25:11
  

  sha256: indirection for experimental functions The experimental function signature is only available when `GIT_EXPERIMENTAL_SHA256` is enabled.

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• examples/rev-list.c

• /*
   * libgit2 "rev-list" example - shows how to transform a rev-spec into a list
   * of commit ids
   *
   * 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"
  
  #include <assert.h>
  
  static int revwalk_parse_options(git_sort_t *sort, struct args_info *args);
  static int revwalk_parse_revs(git_repository *repo, git_revwalk *walk, struct args_info *args);
  
  int lg2_rev_list(git_repository *repo, int argc, char **argv)
  {
  	struct args_info args = ARGS_INFO_INIT;
  	git_revwalk *walk;
  	git_oid oid;
  	git_sort_t sort;
  	char buf[GIT_OID_SHA1_HEXSIZE+1];
  
  	check_lg2(revwalk_parse_options(&sort, &args), "parsing options", NULL);
  
  	check_lg2(git_revwalk_new(&walk, repo), "allocating revwalk", NULL);
  	git_revwalk_sorting(walk, sort);
  	check_lg2(revwalk_parse_revs(repo, walk, &args), "parsing revs", NULL);
  
  	while (!git_revwalk_next(&oid, walk)) {
  		git_oid_fmt(buf, &oid);
  		buf[GIT_OID_SHA1_HEXSIZE] = '\0';
  		printf("%s\n", buf);
  	}
  
  	git_revwalk_free(walk);
  	return 0;
  }
  
  static int push_commit(git_revwalk *walk, const git_oid *oid, int hide)
  {
  	if (hide)
  		return git_revwalk_hide(walk, oid);
  	else
  		return git_revwalk_push(walk, oid);
  }
  
  static int push_spec(git_repository *repo, git_revwalk *walk, const char *spec, int hide)
  {
  	int error;
  	git_object *obj;
  
  	if ((error = git_revparse_single(&obj, repo, spec)) < 0)
  		return error;
  
  	error = push_commit(walk, git_object_id(obj), hide);
  	git_object_free(obj);
  	return error;
  }
  
  static int push_range(git_repository *repo, git_revwalk *walk, const char *range, int hide)
  {
  	git_revspec revspec;
  	int error = 0;
  
  	if ((error = git_revparse(&revspec, repo, range)))
  		return error;
  
  	if (revspec.flags & GIT_REVSPEC_MERGE_BASE) {
  		/* TODO: support "<commit>...<commit>" */
  		return GIT_EINVALIDSPEC;
  	}
  
  	if ((error = push_commit(walk, git_object_id(revspec.from), !hide)))
  		goto out;
  
  	error = push_commit(walk, git_object_id(revspec.to), hide);
  
  out:
  	git_object_free(revspec.from);
  	git_object_free(revspec.to);
  	return error;
  }
  
  static void print_usage(void)
  {
  	fprintf(stderr, "rev-list [--git-dir=dir] [--topo-order|--date-order] [--reverse] <revspec>\n");
  	exit(-1);
  }
  
  static int revwalk_parse_options(git_sort_t *sort, struct args_info *args)
  {
  	assert(sort && args);
  	*sort = GIT_SORT_NONE;
  
  	if (args->argc < 1)
  		print_usage();
  
  	for (args->pos = 1; args->pos < args->argc; ++args->pos) {
  		const char *curr = args->argv[args->pos];
  
  		if (!strcmp(curr, "--topo-order")) {
  			*sort |= GIT_SORT_TOPOLOGICAL;
  		} else if (!strcmp(curr, "--date-order")) {
  			*sort |= GIT_SORT_TIME;
  		} else if (!strcmp(curr, "--reverse")) {
  			*sort |= (*sort & ~GIT_SORT_REVERSE) ^ GIT_SORT_REVERSE;
  		} else {
  			break;
  		}
  	}
  	return 0;
  }
  
  static int revwalk_parse_revs(git_repository *repo, git_revwalk *walk, struct args_info *args)
  {
  	int hide, error;
  	git_oid oid;
  
  	hide = 0;
  	for (; args->pos < args->argc; ++args->pos) {
  		const char *curr = args->argv[args->pos];
  
  		if (!strcmp(curr, "--not")) {
  			hide = !hide;
  		} else if (curr[0] == '^') {
  			if ((error = push_spec(repo, walk, curr + 1, !hide)))
  				return error;
  		} else if (strstr(curr, "..")) {
  			if ((error = push_range(repo, walk, curr, hide)))
  				return error;
  		} else {
  			if (push_spec(repo, walk, curr, hide) == 0)
  				continue;
  
  #ifdef GIT_EXPERIMENTAL_SHA256
  			if ((error = git_oid_fromstr(&oid, curr, GIT_OID_SHA1)))
  				return error;
  #else
  			if ((error = git_oid_fromstr(&oid, curr)))
  				return error;
  #endif
  
  			if ((error = push_commit(walk, &oid, hide)))
  				return error;
  		}
  	}
  
  	return 0;
  }
  
  

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