thodg/libgit2/src/cli/main.c

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• Hash : 8a757ae2
  Author :
  Date : 2020-04-04T18:31:00
  

  cli: introduce a clone command

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• src/cli/main.c

• /*
   * Copyright (C) the libgit2 contributors. All rights reserved.
   *
   * This file is part of libgit2, distributed under the GNU GPL v2 with
   * a Linking Exception. For full terms see the included COPYING file.
   */
  
  #include <stdio.h>
  #include <git2.h>
  #include "cli.h"
  #include "cmd.h"
  
  static int show_help = 0;
  static int show_version = 0;
  static char *command = NULL;
  static char **args = NULL;
  
  const cli_opt_spec cli_common_opts[] = {
  	{ CLI_OPT_TYPE_SWITCH,    "help",      0, &show_help,    1,
  	  CLI_OPT_USAGE_DEFAULT,   NULL,      "display help information" },
  	{ CLI_OPT_TYPE_SWITCH,    "version",   0, &show_version, 1,
  	  CLI_OPT_USAGE_DEFAULT,   NULL,      "display the version" },
  	{ CLI_OPT_TYPE_ARG,       "command",   0, &command,      0,
  	  CLI_OPT_USAGE_REQUIRED, "command", "the command to run" },
  	{ CLI_OPT_TYPE_ARGS,      "args",      0, &args,         0,
  	  CLI_OPT_USAGE_DEFAULT,  "args",    "arguments for the command" },
  	{ 0 }
  };
  
  const cli_cmd_spec cli_cmds[] = {
  	{ "cat-file",    cmd_cat_file,    "Display an object in the repository" },
  	{ "clone",       cmd_clone,       "Clone a repository into a new directory" },
  	{ "hash-object", cmd_hash_object, "Hash a raw object and product its object ID" },
  	{ "help",        cmd_help,        "Display help information" },
  	{ NULL }
  };
  
  int main(int argc, char **argv)
  {
  	const cli_cmd_spec *cmd;
  	cli_opt_parser optparser;
  	cli_opt opt;
  	char *help_args[3] = { NULL };
  	int help_args_len;
  	int args_len = 0;
  	int ret = 0;
  
  	if (git_libgit2_init() < 0) {
  		cli_error("failed to initialize libgit2");
  		exit(CLI_EXIT_GIT);
  	}
  
  	cli_opt_parser_init(&optparser, cli_common_opts, argv + 1, argc - 1, CLI_OPT_PARSE_GNU);
  
  	/* Parse the top-level (common) options and command information */
  	while (cli_opt_parser_next(&opt, &optparser)) {
  		if (!opt.spec) {
  			cli_opt_status_fprint(stderr, PROGRAM_NAME, &opt);
  			cli_opt_usage_fprint(stderr, PROGRAM_NAME, NULL, cli_common_opts);
  			ret = CLI_EXIT_USAGE;
  			goto done;
  		}
  
  		/*
  		 * When we see a command, stop parsing and capture the
  		 * remaining arguments as args for the command itself.
  		 */
  		if (command) {
  			args = &argv[optparser.idx];
  			args_len = (int)(argc - optparser.idx);
  			break;
  		}
  	}
  
  	if (show_version) {
  		printf("%s version %s\n", PROGRAM_NAME, LIBGIT2_VERSION);
  		goto done;
  	}
  
  	/*
  	 * If `--help <command>` is specified, delegate to that command's
  	 * `--help` option.  If no command is specified, run the `help`
  	 * command.  Do this by updating the args to emulate that behavior.
  	 */
  	if (!command || show_help) {
  		help_args[0] = command ? (char *)command : "help";
  		help_args[1] = command ? "--help" : NULL;
  		help_args_len = command ? 2 : 1;
  
  		command = help_args[0];
  		args = help_args;
  		args_len = help_args_len;
  	}
  
  	if ((cmd = cli_cmd_spec_byname(command)) == NULL) {
  		ret = cli_error("'%s' is not a %s command. See '%s help'.",
  		                command, PROGRAM_NAME, PROGRAM_NAME);
  		goto done;
  	}
  
  	ret = cmd->fn(args_len, args);
  
  done:
  	git_libgit2_shutdown();
  	return ret;
  }
  

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