Function help_unknown_cmd

help.c:644–775

	"able to execute it. Maybe git-%s is broken?");

char *help_unknown_cmd(const char *cmd)
{
	struct help_unknown_cmd_config cfg = { 0 };
	int i, n, best_similarity = 0;
	struct cmdnames main_cmds = { 0 };
	struct cmdnames other_cmds = { 0 };
	struct cmdname_help *common_cmds;

	read_early_config(the_repository, git_unknown_cmd_config, &cfg);

	/*
	 * Disable autocorrection prompt in a non-interactive session
	 */
	if ((cfg.autocorrect == AUTOCORRECT_PROMPT) && (!isatty(0) || !isatty(2)))
		cfg.autocorrect = AUTOCORRECT_NEVER;

	if (cfg.autocorrect == AUTOCORRECT_NEVER) {
		fprintf_ln(stderr, _("git: '%s' is not a git command. See 'git --help'."), cmd);
		exit(1);
	}

	load_command_list("git-", &main_cmds, &other_cmds);

	add_cmd_list(&main_cmds, &cfg.aliases);
	add_cmd_list(&main_cmds, &other_cmds);
	QSORT(main_cmds.names, main_cmds.cnt, cmdname_compare);
	uniq(&main_cmds);

	extract_cmds(&common_cmds, common_mask);

	/* This abuses cmdname->len for levenshtein distance */
	for (i = 0, n = 0; i < main_cmds.cnt; i++) {
		int cmp = 0; /* avoid compiler stupidity */
		const char *candidate = main_cmds.names[i]->name;

		/*
		 * An exact match means we have the command, but
		 * for some reason exec'ing it gave us ENOENT; probably
		 * it's a bad interpreter in the #! line.
		 */
		if (!strcmp(candidate, cmd))
			die(_(bad_interpreter_advice), cmd, cmd);

		/* Does the candidate appear in common_cmds list? */
		while (common_cmds[n].name &&
		       (cmp = strcmp(common_cmds[n].name, candidate)) < 0)
			n++;
		if (common_cmds[n].name && !cmp) {
			/* Yes, this is one of the common commands */
			n++; /* use the entry from common_cmds[] */
			if (starts_with(candidate, cmd)) {
				/* Give prefix match a very good score */
				main_cmds.names[i]->len = 0;
				continue;
			}
		}

		main_cmds.names[i]->len =