thodg/libgit2/examples/lg2.c

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• Hash : 8ee3d39a
  Author :
  Date : 2019-06-27T09:18:19
  

  examples: implement config example Implement a new example that resembles git-config(1). Right now, this example can both read and set configuration keys, only.

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• examples/lg2.c

• #include "common.h"
  
  /* This part is not strictly libgit2-dependent, but you can use this
   * as a starting point for a git-like tool */
  
  typedef int (*git_command_fn)(git_repository *, int , char **);
  
  struct {
  	char *name;
  	git_command_fn fn;
  	char requires_repo;
  } commands[] = {
  	{ "add",          lg2_add,          1 },
  	{ "blame",        lg2_blame,        1 },
  	{ "cat-file",     lg2_cat_file,     1 },
  	{ "checkout",     lg2_checkout,     1 },
  	{ "clone",        lg2_clone,        0 },
  	{ "config",       lg2_config,       1 },
  	{ "describe",     lg2_describe,     1 },
  	{ "diff",         lg2_diff,         1 },
  	{ "fetch",        lg2_fetch,        1 },
  	{ "for-each-ref", lg2_for_each_ref, 1 },
  	{ "general",      lg2_general,      0 },
  	{ "index-pack",   lg2_index_pack,   1 },
  	{ "init",         lg2_init,         0 },
  	{ "log",          lg2_log,          1 },
  	{ "ls-files",     lg2_ls_files,     1 },
  	{ "ls-remote",    lg2_ls_remote,    1 },
  	{ "merge",        lg2_merge,        1 },
  	{ "remote",       lg2_remote,       1 },
  	{ "rev-list",     lg2_rev_list,     1 },
  	{ "rev-parse",    lg2_rev_parse,    1 },
  	{ "show-index",   lg2_show_index,   0 },
  	{ "status",       lg2_status,       1 },
  	{ "tag",          lg2_tag,          1 },
  };
  
  static int run_command(git_command_fn fn, git_repository *repo, struct args_info args)
  {
  	int error;
  
  	/* Run the command. If something goes wrong, print the error message to stderr */
  	error = fn(repo, args.argc - args.pos, &args.argv[args.pos]);
  	if (error < 0) {
  		if (git_error_last() == NULL)
  			fprintf(stderr, "Error without message");
  		else
  			fprintf(stderr, "Bad news:\n %s\n", git_error_last()->message);
  	}
  
  	return !!error;
  }
  
  static int usage(const char *prog)
  {
  	size_t i;
  
  	fprintf(stderr, "usage: %s <cmd>...\n\nAvailable commands:\n\n", prog);
  	for (i = 0; i < ARRAY_SIZE(commands); i++)
  		fprintf(stderr, "\t%s\n", commands[i].name);
  
  	exit(EXIT_FAILURE);
  }
  
  int main(int argc, char **argv)
  {
  	struct args_info args = ARGS_INFO_INIT;
  	git_repository *repo = NULL;
  	const char *git_dir = NULL;
  	int return_code = 1;
  	size_t i;
  
  	if (argc < 2)
  		usage(argv[0]);
  
  	git_libgit2_init();
  
  	for (args.pos = 1; args.pos < args.argc; ++args.pos) {
  		char *a = args.argv[args.pos];
  
  		if (a[0] != '-') {
  			/* non-arg */
  			break;
  		} else if (optional_str_arg(&git_dir, &args, "--git-dir", ".git")) {
  			continue;
  		} else if (!strcmp(a, "--")) {
  			/* arg separator */
  			break;
  		}
  	}
  
  	if (args.pos == args.argc)
  		usage(argv[0]);
  
  	if (!git_dir)
  		git_dir = ".";
  
  	for (i = 0; i < ARRAY_SIZE(commands); ++i) {
  		if (strcmp(args.argv[args.pos], commands[i].name))
  			continue;
  
  		/*
  		 * Before running the actual command, create an instance
  		 * of the local repository and pass it to the function.
  		 * */
  		if (commands[i].requires_repo) {
  			check_lg2(git_repository_open_ext(&repo, git_dir, 0, NULL),
  				  "Unable to open repository '%s'", git_dir);
  		}
  
  		return_code = run_command(commands[i].fn, repo, args);
  		goto shutdown;
  	}
  
  	fprintf(stderr, "Command not found: %s\n", argv[1]);
  
  shutdown:
  	git_repository_free(repo);
  	git_libgit2_shutdown();
  
  	return return_code;
  }
  

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