thodg/libgit2/examples/add.c

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• Hash : 313908f9
  Author :
  Date : 2019-11-06T11:08:49
  

  examples: normalize decls and usage of options structs

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• examples/add.c

• /*
   * libgit2 "add" example - shows how to modify 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"
  
  /**
   * The following example demonstrates how to add files with libgit2.
   *
   * It will use the repository in the current working directory, and act
   * on files passed as its parameters.
   *
   * Recognized options are:
   *   -v/--verbose: show the file's status after acting on it.
   *   -n/--dry-run: do not actually change the index.
   *   -u/--update: update the index instead of adding to it.
   */
  
  enum index_mode {
  	INDEX_NONE,
  	INDEX_ADD,
  };
  
  struct index_options {
  	int dry_run;
  	int verbose;
  	git_repository *repo;
  	enum index_mode mode;
  	int add_update;
  };
  
  /* Forward declarations for helpers */
  static void parse_opts(const char **repo_path, struct index_options *opts, struct args_info *args);
  int print_matched_cb(const char *path, const char *matched_pathspec, void *payload);
  
  int lg2_add(git_repository *repo, int argc, char **argv)
  {
  	git_index_matched_path_cb matched_cb = NULL;
  	git_index *index;
  	git_strarray array = {0};
  	struct index_options options;
  	struct args_info args = ARGS_INFO_INIT;
  
  	/* Parse the options & arguments. */
  	parse_opts(NULL, &options, &args);
  	strarray_from_args(&array, &args);
  
  	/* Grab the repository's index. */
  	check_lg2(git_repository_index(&index, repo), "Could not open repository index", NULL);
  
  	/* Setup a callback if the requested options need it */
  	if (options.verbose || options.dry_run) {
  		matched_cb = &print_matched_cb;
  	}
  
  	options.repo = repo;
  
  	/* Perform the requested action with the index and files */
  	if (options.add_update) {
  		git_index_update_all(index, &array, matched_cb, &options);
  	} else {
  		git_index_add_all(index, &array, 0, matched_cb, &options);
  	}
  
  	/* Cleanup memory */
  	git_index_write(index);
  	git_index_free(index);
  
  	return 0;
  }
  
  /*
   * This callback is called for each file under consideration by
   * git_index_(update|add)_all above.
   * It makes uses of the callback's ability to abort the action.
   */
  int print_matched_cb(const char *path, const char *matched_pathspec, void *payload)
  {
  	struct index_options *opts = (struct index_options *)(payload);
  	int ret;
  	unsigned status;
  	(void)matched_pathspec;
  
  	/* Get the file status */
  	if (git_status_file(&status, opts->repo, path) < 0)
  		return -1;
  
  	if ((status & GIT_STATUS_WT_MODIFIED) || (status & GIT_STATUS_WT_NEW)) {
  		printf("add '%s'\n", path);
  		ret = 0;
  	} else {
  		ret = 1;
  	}
  
  	if (opts->dry_run)
  		ret = 1;
  
  	return ret;
  }
  
  void init_array(git_strarray *array, int argc, char **argv)
  {
  	unsigned int i;
  
  	array->count = argc;
  	array->strings = calloc(array->count, sizeof(char *));
  	assert(array->strings != NULL);
  
  	for (i = 0; i < array->count; i++) {
  		array->strings[i] = argv[i];
  	}
  
  	return;
  }
  
  void print_usage(void)
  {
  	fprintf(stderr, "usage: add [options] [--] file-spec [file-spec] [...]\n\n");
  	fprintf(stderr, "\t-n, --dry-run    dry run\n");
  	fprintf(stderr, "\t-v, --verbose    be verbose\n");
  	fprintf(stderr, "\t-u, --update     update tracked files\n");
  	exit(1);
  }
  
  static void parse_opts(const char **repo_path, struct index_options *opts, struct args_info *args)
  {
  	if (args->argc <= 1)
  		print_usage();
  
  	for (args->pos = 1; args->pos < args->argc; ++args->pos) {
  		const char *curr = args->argv[args->pos];
  
  		if (curr[0] != '-') {
  			if (!strcmp("add", curr)) {
  				opts->mode = INDEX_ADD;
  				continue;
  			} else if (opts->mode == INDEX_NONE) {
  				fprintf(stderr, "missing command: %s", curr);
  				print_usage();
  				break;
  			} else {
  				/* We might be looking at a filename */
  				break;
  			}
  		} else if (match_bool_arg(&opts->verbose, args, "--verbose") ||
  				   match_bool_arg(&opts->dry_run, args, "--dry-run") ||
  				   match_str_arg(repo_path, args, "--git-dir") ||
  				   (opts->mode == INDEX_ADD && match_bool_arg(&opts->add_update, args, "--update"))) {
  			continue;
  		} else if (match_bool_arg(NULL, args, "--help")) {
  			print_usage();
  			break;
  		} else if (match_arg_separator(args)) {
  			break;
  		} else {
  			fprintf(stderr, "Unsupported option %s.\n", curr);
  			print_usage();
  		}
  	}
  }
  

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