thodg/libgit2/examples/ls-files.c

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• Hash : 8aa437ef
  Author :
  Date : 2018-05-02T07:55:26
  

  tests: ls-files: use puts instead of printf and fix typos

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• examples/ls-files.c

• /*
   * 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"
  #include "array.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.
   */
  
  typedef struct {
  	int error_unmatch;
  	char *files[1024];
  	size_t file_count;
  } ls_options;
  
  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(ls_options *opts, int argc, char *argv[])
  {
  	int parsing_files = 0;
  	int i;
  
  	memset(opts, 0, sizeof(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(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 main(int argc, char *argv[])
  {
  	ls_options opts;
  	git_repository *repo = NULL;
  	git_index *index = NULL;
  	int error;
  
  	if ((error = parse_options(&opts, argc, argv)) < 0)
  		return error;
  
  	git_libgit2_init();
  
  	if ((error = git_repository_open_ext(&repo, ".", 0, NULL)) < 0)
  		goto cleanup;
  
  	if ((error = git_repository_index(&index, repo)) < 0)
  		goto cleanup;
  
  	error = print_paths(&opts, index);
  
  cleanup:
  	git_index_free(index);
  	git_repository_free(repo);
  	git_libgit2_shutdown();
  
  	return error;
  }
  

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