ls-files.c 3.3 KB
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/*
 * libgit2 "ls-files" example - shows how to view all files currently in the index
 *
 * 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/>.
 */
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#include "common.h"

/**
 * This example demonstrates the libgit2 index APIs to roughly
 * simulate the output of `git ls-files`.
 * `git ls-files` has many options and this currently does not show them.
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 *
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 * `git ls-files` base command shows all paths in the index at that time.
 * This includes staged and committed files, but unstaged files will not display.
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 *
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 * This currently supports the default behavior and the `--error-unmatch` option.
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 */

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struct ls_options {
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	int error_unmatch;
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	char *files[1024];
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	size_t file_count;
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};
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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: ls-files [--error-unmatch] [--] [<file>...]\n");
	exit(1);
}

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static int parse_options(struct ls_options *opts, int argc, char *argv[])
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{
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	int parsing_files = 0;
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	int i;
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	memset(opts, 0, sizeof(struct ls_options));
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	if (argc < 2)
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		return 0;
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	for (i = 1; i < argc; ++i) {
		char *a = argv[i];
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		/* if it doesn't start with a '-' or is after the '--' then it is a file */
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		if (a[0] != '-' || parsing_files) {
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			parsing_files = 1;
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			/* watch for overflows (just in case) */
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			if (opts->file_count == 1024) {
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				fprintf(stderr, "ls-files can only support 1024 files at this time.\n");
				return -1;
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			}

			opts->files[opts->file_count++] = a;
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		} else if (!strcmp(a, "--")) {
			parsing_files = 1;
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		} else if (!strcmp(a, "--error-unmatch")) {
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			opts->error_unmatch = 1;
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		} else {
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			usage("Unsupported argument", a);
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			return -1;
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		}
	}
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	return 0;
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}
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static int print_paths(struct ls_options *opts, git_index *index)
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{
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	size_t i;
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	const git_index_entry *entry;
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	/* if there are no files explicitly listed by the user print all entries in the index */
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	if (opts->file_count == 0) {
		size_t entry_count = git_index_entrycount(index);

		for (i = 0; i < entry_count; i++) {
			entry = git_index_get_byindex(index, i);
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			puts(entry->path);
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		}
		return 0;
	}
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	/* loop through the files found in the args and print them if they exist */
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	for (i = 0; i < opts->file_count; ++i) {
		const char *path = opts->files[i];
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		if ((entry = git_index_get_bypath(index, path, GIT_INDEX_STAGE_NORMAL)) != NULL) {
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			puts(path);
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		} else if (opts->error_unmatch) {
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			fprintf(stderr, "error: pathspec '%s' did not match any file(s) known to git.\n", path);
			fprintf(stderr, "Did you forget to 'git add'?\n");
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			return -1;
		}
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	}
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	return 0;
}
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int lg2_ls_files(git_repository *repo, int argc, char *argv[])
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{
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	git_index *index = NULL;
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	struct ls_options opts;
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	int error;

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	if ((error = parse_options(&opts, argc, argv)) < 0)
		return error;
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	if ((error = git_repository_index(&index, repo)) < 0)
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		goto cleanup;

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	error = print_paths(&opts, index);
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cleanup:
	git_index_free(index);

	return error;
}