thodg/libgit2/examples/ls-files.c

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• Hash : ead10785
  Author :
  Date : 2019-01-24T11:31:49
  

  examples: create common lg2 executable Inside of our networking example code, we have a git2 executable that acts as an entry point to all the different network examples. As such, it is kind of the same like the normal git(1) executable in that it simply arbitrates to the respective subcommands. Let's extend this approach and merge all examples into a single standalone lg2 executable. Instead of building an executable for all the existing examples we have, we now bundle them all inside of the lg2 one and let them be callable via subcommands. In the process, we can get rid of duplicated library initialization, deinitialization and repository discovery code. Instead of having each subcommand handle these on its own, we simply do it inside of the single main function now.

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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"
  
  /**
   * 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 lg2_ls_files(git_repository *repo, int argc, char *argv[])
  {
  	git_index *index = NULL;
  	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;
  }
  

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