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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/>.

#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.

* `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.

* This currently supports the default behavior and the `--error-unmatch` option.

struct ls_options {

int error_unmatch;

char *files[1024];

size_t file_count;

};

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);

}

static int parse_options(struct ls_options *opts, int argc, char *argv[])

{

int parsing_files = 0;

int i;

memset(opts, 0, sizeof(struct ls_options));

if (argc < 2)

return 0;

for (i = 1; i < argc; ++i) {

char *a = argv[i];

/* if it doesn't start with a '-' or is after the '--' then it is a file */

if (a[0] != '-' || parsing_files) {

parsing_files = 1;

/* watch for overflows (just in case) */

if (opts->file_count == 1024) {

fprintf(stderr, "ls-files can only support 1024 files at this time.\n");

return -1;

}

opts->files[opts->file_count++] = a;

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

parsing_files = 1;

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

opts->error_unmatch = 1;

} else {

usage("Unsupported argument", a);

return -1;

}

return 0;

}

static int print_paths(struct ls_options *opts, git_index *index)

{

size_t i;

const git_index_entry *entry;

/* if there are no files explicitly listed by the user print all entries in the index */

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);

puts(entry->path);

}

return 0;

}

/* loop through the files found in the args and print them if they exist */

for (i = 0; i < opts->file_count; ++i) {

const char *path = opts->files[i];

if ((entry = git_index_get_bypath(index, path, GIT_INDEX_STAGE_NORMAL)) != NULL) {

puts(path);

} else if (opts->error_unmatch) {

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");

return -1;

}

return 0;

}

int lg2_ls_files(git_repository *repo, int argc, char *argv[])

{

git_index *index = NULL;

struct ls_options opts;

int error;

if ((error = parse_options(&opts, argc, argv)) < 0)

return error;

if ((error = git_repository_index(&index, repo)) < 0)

goto cleanup;

error = print_paths(&opts, index);

cleanup:

git_index_free(index);

return error;

}