parse-options.c 17.5 KB
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#include "git-compat-util.h"
#include "parse-options.h"
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#include "cache.h"
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#include "config.h"
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#include "commit.h"
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#include "color.h"
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#include "utf8.h"
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#define OPT_SHORT 1
#define OPT_UNSET 2

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int optbug(const struct option *opt, const char *reason)
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{
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	if (opt->long_name) {
		if (opt->short_name)
			return error("BUG: switch '%c' (--%s) %s",
				     opt->short_name, opt->long_name, reason);
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		return error("BUG: option '%s' %s", opt->long_name, reason);
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	}
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	return error("BUG: switch '%c' %s", opt->short_name, reason);
}

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static int get_arg(struct parse_opt_ctx_t *p, const struct option *opt,
		   int flags, const char **arg)
{
	if (p->opt) {
		*arg = p->opt;
		p->opt = NULL;
	} else if (p->argc == 1 && (opt->flags & PARSE_OPT_LASTARG_DEFAULT)) {
		*arg = (const char *)opt->defval;
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	} else if (p->argc > 1) {
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		p->argc--;
		*arg = *++p->argv;
	} else
		return opterror(opt, "requires a value", flags);
	return 0;
}

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static void fix_filename(const char *prefix, const char **file)
{
	if (!file || !*file || !prefix || is_absolute_path(*file)
	    || !strcmp("-", *file))
		return;
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	*file = prefix_filename(prefix, *file);
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}

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static int opt_command_mode_error(const struct option *opt,
				  const struct option *all_opts,
				  int flags)
{
	const struct option *that;
	struct strbuf message = STRBUF_INIT;
	struct strbuf that_name = STRBUF_INIT;

	/*
	 * Find the other option that was used to set the variable
	 * already, and report that this is not compatible with it.
	 */
	for (that = all_opts; that->type != OPTION_END; that++) {
		if (that == opt ||
		    that->type != OPTION_CMDMODE ||
		    that->value != opt->value ||
		    that->defval != *(int *)opt->value)
			continue;

		if (that->long_name)
			strbuf_addf(&that_name, "--%s", that->long_name);
		else
			strbuf_addf(&that_name, "-%c", that->short_name);
		strbuf_addf(&message, ": incompatible with %s", that_name.buf);
		strbuf_release(&that_name);
		opterror(opt, message.buf, flags);
		strbuf_release(&message);
		return -1;
	}
	return opterror(opt, ": incompatible with something else", flags);
}

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static int get_value(struct parse_opt_ctx_t *p,
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		     const struct option *opt,
		     const struct option *all_opts,
		     int flags)
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{
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	const char *s, *arg;
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	const int unset = flags & OPT_UNSET;
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	int err;
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	if (unset && p->opt)
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		return opterror(opt, "takes no value", flags);
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	if (unset && (opt->flags & PARSE_OPT_NONEG))
		return opterror(opt, "isn't available", flags);
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	if (!(flags & OPT_SHORT) && p->opt && (opt->flags & PARSE_OPT_NOARG))
		return opterror(opt, "takes no value", flags);
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	switch (opt->type) {
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	case OPTION_LOWLEVEL_CALLBACK:
		return (*(parse_opt_ll_cb *)opt->callback)(p, opt, unset);

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	case OPTION_BIT:
		if (unset)
			*(int *)opt->value &= ~opt->defval;
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		else
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			*(int *)opt->value |= opt->defval;
		return 0;

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René Scharfe committed
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	case OPTION_NEGBIT:
		if (unset)
			*(int *)opt->value |= opt->defval;
		else
			*(int *)opt->value &= ~opt->defval;
		return 0;

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	case OPTION_COUNTUP:
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		if (*(int *)opt->value < 0)
			*(int *)opt->value = 0;
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		*(int *)opt->value = unset ? 0 : *(int *)opt->value + 1;
		return 0;

	case OPTION_SET_INT:
		*(int *)opt->value = unset ? 0 : opt->defval;
		return 0;

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	case OPTION_CMDMODE:
		/*
		 * Giving the same mode option twice, although is unnecessary,
		 * is not a grave error, so let it pass.
		 */
		if (*(int *)opt->value && *(int *)opt->value != opt->defval)
			return opt_command_mode_error(opt, all_opts, flags);
		*(int *)opt->value = opt->defval;
		return 0;

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	case OPTION_STRING:
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		if (unset)
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			*(const char **)opt->value = NULL;
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		else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
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			*(const char **)opt->value = (const char *)opt->defval;
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		else
			return get_arg(p, opt, flags, (const char **)opt->value);
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		return 0;

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	case OPTION_FILENAME:
		err = 0;
		if (unset)
			*(const char **)opt->value = NULL;
		else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
			*(const char **)opt->value = (const char *)opt->defval;
		else
			err = get_arg(p, opt, flags, (const char **)opt->value);

		if (!err)
			fix_filename(p->prefix, (const char **)opt->value);
		return err;

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	case OPTION_CALLBACK:
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		if (unset)
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			return (*opt->callback)(opt, NULL, 1) ? (-1) : 0;
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		if (opt->flags & PARSE_OPT_NOARG)
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			return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
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		if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
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			return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
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		if (get_arg(p, opt, flags, &arg))
			return -1;
		return (*opt->callback)(opt, arg, 0) ? (-1) : 0;
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	case OPTION_INTEGER:
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		if (unset) {
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			*(int *)opt->value = 0;
			return 0;
		}
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		if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
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			*(int *)opt->value = opt->defval;
			return 0;
		}
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		if (get_arg(p, opt, flags, &arg))
			return -1;
		*(int *)opt->value = strtol(arg, (char **)&s, 10);
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		if (*s)
			return opterror(opt, "expects a numerical value", flags);
		return 0;

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	case OPTION_MAGNITUDE:
		if (unset) {
			*(unsigned long *)opt->value = 0;
			return 0;
		}
		if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
			*(unsigned long *)opt->value = opt->defval;
			return 0;
		}
		if (get_arg(p, opt, flags, &arg))
			return -1;
		if (!git_parse_ulong(arg, opt->value))
			return opterror(opt,
				"expects a non-negative integer value with an optional k/m/g suffix",
				flags);
		return 0;

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	default:
		die("should not happen, someone must be hit on the forehead");
	}
}

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static int parse_short_opt(struct parse_opt_ctx_t *p, const struct option *options)
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{
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	const struct option *all_opts = options;
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	const struct option *numopt = NULL;

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	for (; options->type != OPTION_END; options++) {
		if (options->short_name == *p->opt) {
			p->opt = p->opt[1] ? p->opt + 1 : NULL;
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			return get_value(p, options, all_opts, OPT_SHORT);
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		}
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		/*
		 * Handle the numerical option later, explicit one-digit
		 * options take precedence over it.
		 */
		if (options->type == OPTION_NUMBER)
			numopt = options;
	}
	if (numopt && isdigit(*p->opt)) {
		size_t len = 1;
		char *arg;
		int rc;

		while (isdigit(p->opt[len]))
			len++;
		arg = xmemdupz(p->opt, len);
		p->opt = p->opt[len] ? p->opt + len : NULL;
		rc = (*numopt->callback)(numopt, arg, 0) ? (-1) : 0;
		free(arg);
		return rc;
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	}
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	return -2;
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}

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static int parse_long_opt(struct parse_opt_ctx_t *p, const char *arg,
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                          const struct option *options)
{
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	const struct option *all_opts = options;
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	const char *arg_end = strchrnul(arg, '=');
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	const struct option *abbrev_option = NULL, *ambiguous_option = NULL;
	int abbrev_flags = 0, ambiguous_flags = 0;
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	for (; options->type != OPTION_END; options++) {
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		const char *rest, *long_name = options->long_name;
		int flags = 0, opt_flags = 0;
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250
		if (!long_name)
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			continue;

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again:
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		if (!skip_prefix(arg, long_name, &rest))
			rest = NULL;
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		if (options->type == OPTION_ARGUMENT) {
			if (!rest)
				continue;
			if (*rest == '=')
				return opterror(options, "takes no value", flags);
			if (*rest)
				continue;
			p->out[p->cpidx++] = arg - 2;
			return 0;
		}
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		if (!rest) {
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			/* abbreviated? */
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			if (!strncmp(long_name, arg, arg_end - arg)) {
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is_abbreviated:
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				if (abbrev_option) {
					/*
					 * If this is abbreviated, it is
					 * ambiguous. So when there is no
					 * exact match later, we need to
					 * error out.
					 */
					ambiguous_option = abbrev_option;
					ambiguous_flags = abbrev_flags;
				}
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				if (!(flags & OPT_UNSET) && *arg_end)
					p->opt = arg_end + 1;
				abbrev_option = options;
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				abbrev_flags = flags ^ opt_flags;
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				continue;
			}
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			/* negation allowed? */
			if (options->flags & PARSE_OPT_NONEG)
				continue;
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			/* negated and abbreviated very much? */
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			if (starts_with("no-", arg)) {
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				flags |= OPT_UNSET;
				goto is_abbreviated;
			}
			/* negated? */
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			if (!starts_with(arg, "no-")) {
				if (starts_with(long_name, "no-")) {
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					long_name += 3;
					opt_flags |= OPT_UNSET;
					goto again;
				}
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				continue;
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			}
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			flags |= OPT_UNSET;
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			if (!skip_prefix(arg + 3, long_name, &rest)) {
				/* abbreviated and negated? */
				if (starts_with(long_name, arg + 3))
					goto is_abbreviated;
				else
					continue;
			}
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		}
		if (*rest) {
			if (*rest != '=')
				continue;
			p->opt = rest + 1;
		}
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		return get_value(p, options, all_opts, flags ^ opt_flags);
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	}
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	if (ambiguous_option)
		return error("Ambiguous option: %s "
			"(could be --%s%s or --%s%s)",
			arg,
			(ambiguous_flags & OPT_UNSET) ?  "no-" : "",
			ambiguous_option->long_name,
			(abbrev_flags & OPT_UNSET) ?  "no-" : "",
			abbrev_option->long_name);
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	if (abbrev_option)
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		return get_value(p, abbrev_option, all_opts, abbrev_flags);
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	return -2;
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}

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static int parse_nodash_opt(struct parse_opt_ctx_t *p, const char *arg,
			    const struct option *options)
{
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	const struct option *all_opts = options;

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	for (; options->type != OPTION_END; options++) {
		if (!(options->flags & PARSE_OPT_NODASH))
			continue;
		if (options->short_name == arg[0] && arg[1] == '\0')
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			return get_value(p, options, all_opts, OPT_SHORT);
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	}
	return -2;
}

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static void check_typos(const char *arg, const struct option *options)
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{
	if (strlen(arg) < 3)
		return;

352
	if (starts_with(arg, "no-")) {
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		error ("did you mean `--%s` (with two dashes ?)", arg);
		exit(129);
	}

	for (; options->type != OPTION_END; options++) {
		if (!options->long_name)
			continue;
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		if (starts_with(options->long_name, arg)) {
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			error ("did you mean `--%s` (with two dashes ?)", arg);
			exit(129);
		}
	}
}

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static void parse_options_check(const struct option *opts)
{
	int err = 0;
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	char short_opts[128];
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372
	memset(short_opts, '\0', sizeof(short_opts));
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	for (; opts->type != OPTION_END; opts++) {
		if ((opts->flags & PARSE_OPT_LASTARG_DEFAULT) &&
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		    (opts->flags & PARSE_OPT_OPTARG))
			err |= optbug(opts, "uses incompatible flags "
					"LASTARG_DEFAULT and OPTARG");
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		if (opts->short_name) {
			if (0x7F <= opts->short_name)
				err |= optbug(opts, "invalid short name");
			else if (short_opts[opts->short_name]++)
				err |= optbug(opts, "short name already used");
		}
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		if (opts->flags & PARSE_OPT_NODASH &&
		    ((opts->flags & PARSE_OPT_OPTARG) ||
		     !(opts->flags & PARSE_OPT_NOARG) ||
		     !(opts->flags & PARSE_OPT_NONEG) ||
		     opts->long_name))
			err |= optbug(opts, "uses feature "
					"not supported for dashless options");
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		switch (opts->type) {
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		case OPTION_COUNTUP:
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		case OPTION_BIT:
		case OPTION_NEGBIT:
		case OPTION_SET_INT:
		case OPTION_NUMBER:
			if ((opts->flags & PARSE_OPT_OPTARG) ||
			    !(opts->flags & PARSE_OPT_NOARG))
				err |= optbug(opts, "should not accept an argument");
		default:
			; /* ok. (usually accepts an argument) */
		}
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		if (opts->argh &&
		    strcspn(opts->argh, " _") != strlen(opts->argh))
			err |= optbug(opts, "multi-word argh should use dash to separate words");
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	}
	if (err)
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		exit(128);
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}

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void parse_options_start(struct parse_opt_ctx_t *ctx,
412
			 int argc, const char **argv, const char *prefix,
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			 const struct option *options, int flags)
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{
	memset(ctx, 0, sizeof(*ctx));
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	ctx->argc = ctx->total = argc - 1;
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	ctx->argv = argv + 1;
	ctx->out  = argv;
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	ctx->prefix = prefix;
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	ctx->cpidx = ((flags & PARSE_OPT_KEEP_ARGV0) != 0);
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	ctx->flags = flags;
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	if ((flags & PARSE_OPT_KEEP_UNKNOWN) &&
	    (flags & PARSE_OPT_STOP_AT_NON_OPTION))
		die("STOP_AT_NON_OPTION and KEEP_UNKNOWN don't go together");
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	parse_options_check(options);
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}

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static int usage_with_options_internal(struct parse_opt_ctx_t *,
				       const char * const *,
430
				       const struct option *, int, int);
431

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int parse_options_step(struct parse_opt_ctx_t *ctx,
		       const struct option *options,
		       const char * const usagestr[])
435
{
436
	int internal_help = !(ctx->flags & PARSE_OPT_NO_INTERNAL_HELP);
437
	int err = 0;
438

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	/* we must reset ->opt, unknown short option leave it dangling */
	ctx->opt = NULL;

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	for (; ctx->argc; ctx->argc--, ctx->argv++) {
		const char *arg = ctx->argv[0];
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		if (*arg != '-' || !arg[1]) {
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			if (parse_nodash_opt(ctx, arg, options) == 0)
				continue;
448
			if (ctx->flags & PARSE_OPT_STOP_AT_NON_OPTION)
449
				return PARSE_OPT_NON_OPTION;
450
			ctx->out[ctx->cpidx++] = ctx->argv[0];
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			continue;
		}

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		/* lone -h asks for help */
		if (internal_help && ctx->total == 1 && !strcmp(arg + 1, "h"))
			goto show_usage;

458
		if (arg[1] != '-') {
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			ctx->opt = arg + 1;
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			switch (parse_short_opt(ctx, options)) {
			case -1:
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				goto show_usage_error;
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			case -2:
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				if (ctx->opt)
					check_typos(arg + 1, options);
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				if (internal_help && *ctx->opt == 'h')
					goto show_usage;
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				goto unknown;
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			}
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			if (ctx->opt)
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				check_typos(arg + 1, options);
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			while (ctx->opt) {
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				switch (parse_short_opt(ctx, options)) {
				case -1:
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					goto show_usage_error;
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				case -2:
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					if (internal_help && *ctx->opt == 'h')
						goto show_usage;

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					/* fake a short option thing to hide the fact that we may have
					 * started to parse aggregated stuff
					 *
					 * This is leaky, too bad.
					 */
					ctx->argv[0] = xstrdup(ctx->opt - 1);
					*(char *)ctx->argv[0] = '-';
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					goto unknown;
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				}
489
			}
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			continue;
		}

		if (!arg[2]) { /* "--" */
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			if (!(ctx->flags & PARSE_OPT_KEEP_DASHDASH)) {
				ctx->argc--;
				ctx->argv++;
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			}
			break;
		}

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		if (internal_help && !strcmp(arg + 2, "help-all"))
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			return usage_with_options_internal(ctx, usagestr, options, 1, 0);
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		if (internal_help && !strcmp(arg + 2, "help"))
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			goto show_usage;
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		switch (parse_long_opt(ctx, arg + 2, options)) {
		case -1:
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			goto show_usage_error;
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		case -2:
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			goto unknown;
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		}
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		continue;
unknown:
		if (!(ctx->flags & PARSE_OPT_KEEP_UNKNOWN))
			return PARSE_OPT_UNKNOWN;
		ctx->out[ctx->cpidx++] = ctx->argv[0];
		ctx->opt = NULL;
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	}
	return PARSE_OPT_DONE;
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 show_usage_error:
	err = 1;
 show_usage:
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	return usage_with_options_internal(ctx, usagestr, options, 0, err);
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}

int parse_options_end(struct parse_opt_ctx_t *ctx)
{
	memmove(ctx->out + ctx->cpidx, ctx->argv, ctx->argc * sizeof(*ctx->out));
	ctx->out[ctx->cpidx + ctx->argc] = NULL;
	return ctx->cpidx + ctx->argc;
}

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int parse_options(int argc, const char **argv, const char *prefix,
		  const struct option *options, const char * const usagestr[],
		  int flags)
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{
	struct parse_opt_ctx_t ctx;

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	parse_options_start(&ctx, argc, argv, prefix, options, flags);
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	switch (parse_options_step(&ctx, options, usagestr)) {
	case PARSE_OPT_HELP:
		exit(129);
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	case PARSE_OPT_NON_OPTION:
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	case PARSE_OPT_DONE:
		break;
	default: /* PARSE_OPT_UNKNOWN */
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		if (ctx.argv[0][1] == '-') {
			error("unknown option `%s'", ctx.argv[0] + 2);
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		} else if (isascii(*ctx.opt)) {
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			error("unknown switch `%c'", *ctx.opt);
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		} else {
			error("unknown non-ascii option in string: `%s'",
			      ctx.argv[0]);
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		}
		usage_with_options(usagestr, options);
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	}

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	precompose_argv(argc, argv);
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	return parse_options_end(&ctx);
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}
561

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static int usage_argh(const struct option *opts, FILE *outfile)
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{
	const char *s;
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	int literal = (opts->flags & PARSE_OPT_LITERAL_ARGHELP) || !opts->argh;
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	if (opts->flags & PARSE_OPT_OPTARG)
		if (opts->long_name)
			s = literal ? "[=%s]" : "[=<%s>]";
		else
			s = literal ? "[%s]" : "[<%s>]";
	else
		s = literal ? " %s" : " <%s>";
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	return utf8_fprintf(outfile, s, opts->argh ? _(opts->argh) : _("..."));
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}

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#define USAGE_OPTS_WIDTH 24
#define USAGE_GAP         2

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static int usage_with_options_internal(struct parse_opt_ctx_t *ctx,
				       const char * const *usagestr,
				       const struct option *opts, int full, int err)
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{
583
	FILE *outfile = err ? stderr : stdout;
584
	int need_newline;
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	if (!usagestr)
		return PARSE_OPT_HELP;

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	if (!err && ctx && ctx->flags & PARSE_OPT_SHELL_EVAL)
		fprintf(outfile, "cat <<\\EOF\n");

592
	fprintf_ln(outfile, _("usage: %s"), _(*usagestr++));
593
	while (*usagestr && **usagestr)
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		/*
		 * TRANSLATORS: the colon here should align with the
		 * one in "usage: %s" translation.
		 */
598
		fprintf_ln(outfile, _("   or: %s"), _(*usagestr++));
599
	while (*usagestr) {
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		if (**usagestr)
			fprintf_ln(outfile, _("    %s"), _(*usagestr));
		else
603
			fputc('\n', outfile);
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		usagestr++;
	}
606

607
	need_newline = 1;
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	for (; opts->type != OPTION_END; opts++) {
		size_t pos;
		int pad;

		if (opts->type == OPTION_GROUP) {
614
			fputc('\n', outfile);
615
			need_newline = 0;
616
			if (*opts->help)
617
				fprintf(outfile, "%s\n", _(opts->help));
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			continue;
		}
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		if (!full && (opts->flags & PARSE_OPT_HIDDEN))
			continue;
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		if (need_newline) {
			fputc('\n', outfile);
			need_newline = 0;
		}

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		pos = fprintf(outfile, "    ");
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		if (opts->short_name) {
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			if (opts->flags & PARSE_OPT_NODASH)
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				pos += fprintf(outfile, "%c", opts->short_name);
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			else
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				pos += fprintf(outfile, "-%c", opts->short_name);
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		}
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		if (opts->long_name && opts->short_name)
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			pos += fprintf(outfile, ", ");
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		if (opts->long_name)
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			pos += fprintf(outfile, "--%s", opts->long_name);
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		if (opts->type == OPTION_NUMBER)
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			pos += utf8_fprintf(outfile, _("-NUM"));
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		if ((opts->flags & PARSE_OPT_LITERAL_ARGHELP) ||
		    !(opts->flags & PARSE_OPT_NOARG))
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			pos += usage_argh(opts, outfile);
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		if (pos <= USAGE_OPTS_WIDTH)
			pad = USAGE_OPTS_WIDTH - pos;
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		else {
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			fputc('\n', outfile);
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			pad = USAGE_OPTS_WIDTH;
		}
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		fprintf(outfile, "%*s%s\n", pad + USAGE_GAP, "", _(opts->help));
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	}
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	fputc('\n', outfile);
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	if (!err && ctx && ctx->flags & PARSE_OPT_SHELL_EVAL)
		fputs("EOF\n", outfile);

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	return PARSE_OPT_HELP;
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}
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void NORETURN usage_with_options(const char * const *usagestr,
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			const struct option *opts)
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{
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	usage_with_options_internal(NULL, usagestr, opts, 0, 1);
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	exit(129);
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}

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void NORETURN usage_msg_opt(const char *msg,
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		   const char * const *usagestr,
		   const struct option *options)
{
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	fprintf(stderr, "fatal: %s\n\n", msg);
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	usage_with_options(usagestr, options);
}

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#undef opterror
int opterror(const struct option *opt, const char *reason, int flags)
{
	if (flags & OPT_SHORT)
		return error("switch `%c' %s", opt->short_name, reason);
	if (flags & OPT_UNSET)
		return error("option `no-%s' %s", opt->long_name, reason);
	return error("option `%s' %s", opt->long_name, reason);
}