[git/git.git] / parse-options.c

#include "git-compat-util.h"
#include "parse-options.h"
#include "cache.h"
#include "commit.h"

#define OPT_SHORT 1
#define OPT_UNSET 2

static 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);
}

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;
	} else if (p->argc > 1) {
		p->argc--;
		*arg = *++p->argv;
	} else
		return opterror(opt, "requires a value", flags);
	return 0;
}

static int get_value(struct parse_opt_ctx_t *p,
		     const struct option *opt, int flags)
{
	const char *s, *arg;
	const int unset = flags & OPT_UNSET;

	if (unset && p->opt)
		return opterror(opt, "takes no value", flags);
	if (unset && (opt->flags & PARSE_OPT_NONEG))
		return opterror(opt, "isn't available", flags);

	if (!(flags & OPT_SHORT) && p->opt) {
		switch (opt->type) {
		case OPTION_CALLBACK:
			if (!(opt->flags & PARSE_OPT_NOARG))
				break;
			/* FALLTHROUGH */
		case OPTION_BOOLEAN:
		case OPTION_BIT:
		case OPTION_NEGBIT:
		case OPTION_SET_INT:
		case OPTION_SET_PTR:
			return opterror(opt, "takes no value", flags);
		default:
			break;
		}
	}

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

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

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

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

	case OPTION_SET_PTR:
		*(void **)opt->value = unset ? NULL : (void *)opt->defval;
		return 0;

	case OPTION_STRING:
		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
			return get_arg(p, opt, flags, (const char **)opt->value);
		return 0;

	case OPTION_CALLBACK:
		if (unset)
			return (*opt->callback)(opt, NULL, 1) ? (-1) : 0;
		if (opt->flags & PARSE_OPT_NOARG)
			return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
		if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
			return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
		if (get_arg(p, opt, flags, &arg))
			return -1;
		return (*opt->callback)(opt, arg, 0) ? (-1) : 0;

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

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

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

	for (; options->type != OPTION_END; options++) {
		if (options->short_name == *p->opt) {
			p->opt = p->opt[1] ? p->opt + 1 : NULL;
			return get_value(p, options, OPT_SHORT);
		}

		/*
		 * 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;
	}
	return -2;
}

static int parse_long_opt(struct parse_opt_ctx_t *p, const char *arg,
                          const struct option *options)
{
	const char *arg_end = strchr(arg, '=');
	const struct option *abbrev_option = NULL, *ambiguous_option = NULL;
	int abbrev_flags = 0, ambiguous_flags = 0;

	if (!arg_end)
		arg_end = arg + strlen(arg);

	for (; options->type != OPTION_END; options++) {
		const char *rest;
		int flags = 0;

		if (!options->long_name)
			continue;

		rest = skip_prefix(arg, options->long_name);
		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;
		}
		if (!rest) {
			/* abbreviated? */
			if (!strncmp(options->long_name, arg, arg_end - arg)) {
is_abbreviated:
				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;
				}
				if (!(flags & OPT_UNSET) && *arg_end)
					p->opt = arg_end + 1;
				abbrev_option = options;
				abbrev_flags = flags;
				continue;
			}
			/* negated and abbreviated very much? */
			if (!prefixcmp("no-", arg)) {
				flags |= OPT_UNSET;
				goto is_abbreviated;
			}
			/* negated? */
			if (strncmp(arg, "no-", 3))
				continue;
			flags |= OPT_UNSET;
			rest = skip_prefix(arg + 3, options->long_name);
			/* abbreviated and negated? */
			if (!rest && !prefixcmp(options->long_name, arg + 3))
				goto is_abbreviated;
			if (!rest)
				continue;
		}
		if (*rest) {
			if (*rest != '=')
				continue;
			p->opt = rest + 1;
		}
		return get_value(p, options, flags);
	}

	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);
	if (abbrev_option)
		return get_value(p, abbrev_option, abbrev_flags);
	return -2;
}

static int parse_nodash_opt(struct parse_opt_ctx_t *p, const char *arg,
			    const struct option *options)
{
	for (; options->type != OPTION_END; options++) {
		if (!(options->flags & PARSE_OPT_NODASH))
			continue;
		if ((options->flags & PARSE_OPT_OPTARG) ||
		    !(options->flags & PARSE_OPT_NOARG))
			die("BUG: dashless options don't support arguments");
		if (!(options->flags & PARSE_OPT_NONEG))
			die("BUG: dashless options don't support negation");
		if (options->long_name)
			die("BUG: dashless options can't be long");
		if (options->short_name == arg[0] && arg[1] == '\0')
			return get_value(p, options, OPT_SHORT);
	}
	return -2;
}

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

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

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

void parse_options_start(struct parse_opt_ctx_t *ctx,
			 int argc, const char **argv, int flags)
{
	memset(ctx, 0, sizeof(*ctx));
	ctx->argc = argc - 1;
	ctx->argv = argv + 1;
	ctx->out  = argv;
	ctx->cpidx = ((flags & PARSE_OPT_KEEP_ARGV0) != 0);
	ctx->flags = flags;
	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");
}

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

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

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

	for (; ctx->argc; ctx->argc--, ctx->argv++) {
		const char *arg = ctx->argv[0];

		if (*arg != '-' || !arg[1]) {
			if (parse_nodash_opt(ctx, arg, options) == 0)
				continue;
			if (ctx->flags & PARSE_OPT_STOP_AT_NON_OPTION)
				break;
			ctx->out[ctx->cpidx++] = ctx->argv[0];
			continue;
		}

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

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

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

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;
}

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

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

	return parse_options_end(&ctx);
}

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

#define USAGE_OPTS_WIDTH 24
#define USAGE_GAP         2

int usage_with_options_internal(const char * const *usagestr,
				const struct option *opts, int full)
{
	if (!usagestr)
		return PARSE_OPT_HELP;

	fprintf(stderr, "usage: %s\n", *usagestr++);
	while (*usagestr && **usagestr)
		fprintf(stderr, "   or: %s\n", *usagestr++);
	while (*usagestr) {
		fprintf(stderr, "%s%s\n",
				**usagestr ? "    " : "",
				*usagestr);
		usagestr++;
	}

	if (opts->type != OPTION_GROUP)
		fputc('\n', stderr);

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

		if (opts->type == OPTION_GROUP) {
			fputc('\n', stderr);
			if (*opts->help)
				fprintf(stderr, "%s\n", opts->help);
			continue;
		}
		if (!full && (opts->flags & PARSE_OPT_HIDDEN))
			continue;

		pos = fprintf(stderr, "    ");
		if (opts->short_name) {
			if (opts->flags & PARSE_OPT_NODASH)
				pos += fprintf(stderr, "%c", opts->short_name);
			else
				pos += fprintf(stderr, "-%c", opts->short_name);
		}
		if (opts->long_name && opts->short_name)
			pos += fprintf(stderr, ", ");
		if (opts->long_name)
			pos += fprintf(stderr, "--%s", opts->long_name);
		if (opts->type == OPTION_NUMBER)
			pos += fprintf(stderr, "-NUM");

		switch (opts->type) {
		case OPTION_ARGUMENT:
			break;
		case OPTION_INTEGER:
			if (opts->flags & PARSE_OPT_OPTARG)
				if (opts->long_name)
					pos += fprintf(stderr, "[=<n>]");
				else
					pos += fprintf(stderr, "[<n>]");
			else
				pos += fprintf(stderr, " <n>");
			break;
		case OPTION_CALLBACK:
			if (opts->flags & PARSE_OPT_NOARG)
				break;
			/* FALLTHROUGH */
		case OPTION_STRING:
			if (opts->argh)
				pos += usage_argh(opts);
			else {
				if (opts->flags & PARSE_OPT_OPTARG)
					if (opts->long_name)
						pos += fprintf(stderr, "[=...]");
					else
						pos += fprintf(stderr, "[...]");
				else
					pos += fprintf(stderr, " ...");
			}
			break;
		default: /* OPTION_{BIT,BOOLEAN,NUMBER,SET_INT,SET_PTR} */
			break;
		}

		if (pos <= USAGE_OPTS_WIDTH)
			pad = USAGE_OPTS_WIDTH - pos;
		else {
			fputc('\n', stderr);
			pad = USAGE_OPTS_WIDTH;
		}
		fprintf(stderr, "%*s%s\n", pad + USAGE_GAP, "", opts->help);
	}
	fputc('\n', stderr);

	return PARSE_OPT_HELP;
}

void usage_with_options(const char * const *usagestr,
			const struct option *opts)
{
	usage_with_options_internal(usagestr, opts, 0);
	exit(129);
}

int parse_options_usage(const char * const *usagestr,
			const struct option *opts)
{
	return usage_with_options_internal(usagestr, opts, 0);
}


/*----- some often used options -----*/
#include "cache.h"

int parse_opt_abbrev_cb(const struct option *opt, const char *arg, int unset)
{
	int v;

	if (!arg) {
		v = unset ? 0 : DEFAULT_ABBREV;
	} else {
		v = strtol(arg, (char **)&arg, 10);
		if (*arg)
			return opterror(opt, "expects a numerical value", 0);
		if (v && v < MINIMUM_ABBREV)
			v = MINIMUM_ABBREV;
		else if (v > 40)
			v = 40;
	}
	*(int *)(opt->value) = v;
	return 0;
}

int parse_opt_approxidate_cb(const struct option *opt, const char *arg,
			     int unset)
{
	*(unsigned long *)(opt->value) = approxidate(arg);
	return 0;
}

int parse_opt_verbosity_cb(const struct option *opt, const char *arg,
			   int unset)
{
	int *target = opt->value;

	if (unset)
		/* --no-quiet, --no-verbose */
		*target = 0;
	else if (opt->short_name == 'v') {
		if (*target >= 0)
			(*target)++;
		else
			*target = 1;
	} else {
		if (*target <= 0)
			(*target)--;
		else
			*target = -1;
	}
	return 0;
}

int parse_opt_with_commit(const struct option *opt, const char *arg, int unset)
{
	unsigned char sha1[20];
	struct commit *commit;

	if (!arg)
		return -1;
	if (get_sha1(arg, sha1))
		return error("malformed object name %s", arg);
	commit = lookup_commit_reference(sha1);
	if (!commit)
		return error("no such commit %s", arg);
	commit_list_insert(commit, opt->value);
	return 0;
}

/*
 * This should really be OPTION_FILENAME type as a part of
 * parse_options that take prefix to do this while parsing.
 */
extern const char *parse_options_fix_filename(const char *prefix, const char *file)
{
	if (!file || !prefix || is_absolute_path(file) || !strcmp("-", file))
		return file;
	return prefix_filename(prefix, strlen(prefix), file);
}
Commit	Line	Data
4a59fd13 PH	1	#include "git-compat-util.h"
4a59fd13 PH	2	#include "parse-options.h"
26141b5b	3	#include "cache.h"
269defdf	4	#include "commit.h"
4a59fd13 PH	5
	6	#define OPT_SHORT 1
	7	#define OPT_UNSET 2
	8
4a59fd13 PH	9	static int opterror(const struct option opt, const char reason, int flags)
	10	{
	11	if (flags & OPT_SHORT)
	12	return error("switch `%c' %s", opt->short_name, reason);
	13	if (flags & OPT_UNSET)
	14	return error("option `no-%s' %s", opt->long_name, reason);
	15	return error("option `%s' %s", opt->long_name, reason);
	16	}
	17
1cc6985c PH	18	static int get_arg(struct parse_opt_ctx_t p, const struct option opt,
	19	int flags, const char **arg)
	20	{
	21	if (p->opt) {
	22	*arg = p->opt;
	23	p->opt = NULL;
	24	} else if (p->argc == 1 && (opt->flags & PARSE_OPT_LASTARG_DEFAULT)) {
	25	arg = (const char )opt->defval;
d5d745f9	26	} else if (p->argc > 1) {
1cc6985c PH	27	p->argc--;
	28	arg = ++p->argv;
	29	} else
	30	return opterror(opt, "requires a value", flags);
	31	return 0;
	32	}
	33
7e7bbcb4	34	static int get_value(struct parse_opt_ctx_t *p,
1cc6985c	35	const struct option *opt, int flags)
4a59fd13	36	{
ffe659f9	37	const char s, arg;
db7244bd	38	const int unset = flags & OPT_UNSET;
4a59fd13	39
db7244bd	40	if (unset && p->opt)
4a59fd13	41	return opterror(opt, "takes no value", flags);
db7244bd PH	42	if (unset && (opt->flags & PARSE_OPT_NONEG))
db7244bd PH	43	return opterror(opt, "isn't available", flags);
4a59fd13	44
db7244bd PH	45	if (!(flags & OPT_SHORT) && p->opt) {
	46	switch (opt->type) {
	47	case OPTION_CALLBACK:
	48	if (!(opt->flags & PARSE_OPT_NOARG))
	49	break;
	50	/* FALLTHROUGH */
	51	case OPTION_BOOLEAN:
	52	case OPTION_BIT:
2f4b97f9	53	case OPTION_NEGBIT:
db7244bd PH	54	case OPTION_SET_INT:
db7244bd PH	55	case OPTION_SET_PTR:
4a59fd13	56	return opterror(opt, "takes no value", flags);
db7244bd PH	57	default:
	58	break;
	59	}
	60	}
	61
db7244bd PH	62	switch (opt->type) {
	63	case OPTION_BIT:
	64	if (unset)
	65	(int )opt->value &= ~opt->defval;
4a59fd13	66	else
db7244bd PH	67	(int )opt->value \|= opt->defval;
	68	return 0;
	69
2f4b97f9 RS	70	case OPTION_NEGBIT:
	71	if (unset)
	72	(int )opt->value \|= opt->defval;
	73	else
	74	(int )opt->value &= ~opt->defval;
	75	return 0;
	76
db7244bd PH	77	case OPTION_BOOLEAN:
	78	(int )opt->value = unset ? 0 : (int )opt->value + 1;
	79	return 0;
	80
	81	case OPTION_SET_INT:
	82	(int )opt->value = unset ? 0 : opt->defval;
	83	return 0;
	84
	85	case OPTION_SET_PTR:
	86	(void )opt->value = unset ? NULL : (void )opt->defval;
4a59fd13 PH	87	return 0;
	88
	89	case OPTION_STRING:
1cc6985c	90	if (unset)
db7244bd	91	(const char *)opt->value = NULL;
1cc6985c	92	else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
ffe659f9	93	(const char )opt->value = (const char )opt->defval;
1cc6985c PH	94	else
1cc6985c PH	95	return get_arg(p, opt, flags, (const char **)opt->value);
4a59fd13 PH	96	return 0;
4a59fd13 PH	97
ffe659f9	98	case OPTION_CALLBACK:
db7244bd	99	if (unset)
07fe54db	100	return (*opt->callback)(opt, NULL, 1) ? (-1) : 0;
db7244bd	101	if (opt->flags & PARSE_OPT_NOARG)
07fe54db	102	return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
c43a2483	103	if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
07fe54db	104	return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
1cc6985c PH	105	if (get_arg(p, opt, flags, &arg))
	106	return -1;
	107	return (*opt->callback)(opt, arg, 0) ? (-1) : 0;
ffe659f9	108
4a59fd13	109	case OPTION_INTEGER:
db7244bd	110	if (unset) {
4a59fd13 PH	111	(int )opt->value = 0;
	112	return 0;
	113	}
c43a2483	114	if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
ffe659f9 PH	115	(int )opt->value = opt->defval;
	116	return 0;
	117	}
1cc6985c PH	118	if (get_arg(p, opt, flags, &arg))
	119	return -1;
	120	(int )opt->value = strtol(arg, (char **)&s, 10);
4a59fd13 PH	121	if (*s)
	122	return opterror(opt, "expects a numerical value", flags);
	123	return 0;
	124
	125	default:
	126	die("should not happen, someone must be hit on the forehead");
	127	}
	128	}
	129
7e7bbcb4	130	static int parse_short_opt(struct parse_opt_ctx_t p, const struct option options)
4a59fd13	131	{
e0319ff5 RS	132	const struct option *numopt = NULL;
e0319ff5 RS	133
4a59fd13 PH	134	for (; options->type != OPTION_END; options++) {
	135	if (options->short_name == *p->opt) {
	136	p->opt = p->opt[1] ? p->opt + 1 : NULL;
	137	return get_value(p, options, OPT_SHORT);
	138	}
e0319ff5 RS	139
	140	/*
	141	* Handle the numerical option later, explicit one-digit
	142	* options take precedence over it.
	143	*/
	144	if (options->type == OPTION_NUMBER)
	145	numopt = options;
	146	}
	147	if (numopt && isdigit(*p->opt)) {
	148	size_t len = 1;
	149	char *arg;
	150	int rc;
	151
	152	while (isdigit(p->opt[len]))
	153	len++;
	154	arg = xmemdupz(p->opt, len);
	155	p->opt = p->opt[len] ? p->opt + len : NULL;
	156	rc = (*numopt->callback)(numopt, arg, 0) ? (-1) : 0;
	157	free(arg);
	158	return rc;
4a59fd13	159	}
07fe54db	160	return -2;
4a59fd13 PH	161	}
4a59fd13 PH	162
7e7bbcb4	163	static int parse_long_opt(struct parse_opt_ctx_t p, const char arg,
4a59fd13 PH	164	const struct option *options)
4a59fd13 PH	165	{
7f275b91	166	const char *arg_end = strchr(arg, '=');
243e0614 JS	167	const struct option abbrev_option = NULL, ambiguous_option = NULL;
243e0614 JS	168	int abbrev_flags = 0, ambiguous_flags = 0;
7f275b91 JS	169
	170	if (!arg_end)
	171	arg_end = arg + strlen(arg);
	172
4a59fd13 PH	173	for (; options->type != OPTION_END; options++) {
	174	const char *rest;
	175	int flags = 0;
	176
	177	if (!options->long_name)
	178	continue;
	179
	180	rest = skip_prefix(arg, options->long_name);
580d5bff PH	181	if (options->type == OPTION_ARGUMENT) {
	182	if (!rest)
	183	continue;
	184	if (*rest == '=')
	185	return opterror(options, "takes no value", flags);
	186	if (*rest)
	187	continue;
	188	p->out[p->cpidx++] = arg - 2;
	189	return 0;
	190	}
4a59fd13	191	if (!rest) {
7f275b91 JS	192	/* abbreviated? */
	193	if (!strncmp(options->long_name, arg, arg_end - arg)) {
	194	is_abbreviated:
243e0614 JS	195	if (abbrev_option) {
	196	/*
	197	* If this is abbreviated, it is
	198	* ambiguous. So when there is no
	199	* exact match later, we need to
	200	* error out.
	201	*/
	202	ambiguous_option = abbrev_option;
	203	ambiguous_flags = abbrev_flags;
	204	}
7f275b91 JS	205	if (!(flags & OPT_UNSET) && *arg_end)
	206	p->opt = arg_end + 1;
	207	abbrev_option = options;
	208	abbrev_flags = flags;
	209	continue;
	210	}
	211	/* negated and abbreviated very much? */
	212	if (!prefixcmp("no-", arg)) {
	213	flags \|= OPT_UNSET;
	214	goto is_abbreviated;
	215	}
	216	/* negated? */
4a59fd13 PH	217	if (strncmp(arg, "no-", 3))
	218	continue;
	219	flags \|= OPT_UNSET;
	220	rest = skip_prefix(arg + 3, options->long_name);
7f275b91 JS	221	/* abbreviated and negated? */
	222	if (!rest && !prefixcmp(options->long_name, arg + 3))
	223	goto is_abbreviated;
4a59fd13 PH	224	if (!rest)
	225	continue;
	226	}
	227	if (*rest) {
	228	if (*rest != '=')
	229	continue;
	230	p->opt = rest + 1;
	231	}
	232	return get_value(p, options, flags);
	233	}
243e0614 JS	234
	235	if (ambiguous_option)
	236	return error("Ambiguous option: %s "
	237	"(could be --%s%s or --%s%s)",
	238	arg,
	239	(ambiguous_flags & OPT_UNSET) ? "no-" : "",
	240	ambiguous_option->long_name,
	241	(abbrev_flags & OPT_UNSET) ? "no-" : "",
	242	abbrev_option->long_name);
7f275b91 JS	243	if (abbrev_option)
7f275b91 JS	244	return get_value(p, abbrev_option, abbrev_flags);
07fe54db	245	return -2;
4a59fd13 PH	246	}
4a59fd13 PH	247
51a9949e RS	248	static int parse_nodash_opt(struct parse_opt_ctx_t p, const char arg,
	249	const struct option *options)
	250	{
	251	for (; options->type != OPTION_END; options++) {
	252	if (!(options->flags & PARSE_OPT_NODASH))
	253	continue;
	254	if ((options->flags & PARSE_OPT_OPTARG) \|\|
	255	!(options->flags & PARSE_OPT_NOARG))
	256	die("BUG: dashless options don't support arguments");
	257	if (!(options->flags & PARSE_OPT_NONEG))
	258	die("BUG: dashless options don't support negation");
	259	if (options->long_name)
	260	die("BUG: dashless options can't be long");
	261	if (options->short_name == arg[0] && arg[1] == '\0')
	262	return get_value(p, options, OPT_SHORT);
	263	}
	264	return -2;
	265	}
	266
1121a878	267	static void check_typos(const char arg, const struct option options)
3a9f0f41 PH	268	{
	269	if (strlen(arg) < 3)
	270	return;
	271
	272	if (!prefixcmp(arg, "no-")) {
	273	error ("did you mean `--%s` (with two dashes ?)", arg);
	274	exit(129);
	275	}
	276
	277	for (; options->type != OPTION_END; options++) {
	278	if (!options->long_name)
	279	continue;
	280	if (!prefixcmp(options->long_name, arg)) {
	281	error ("did you mean `--%s` (with two dashes ?)", arg);
	282	exit(129);
	283	}
	284	}
	285	}
	286
7e7bbcb4 PH	287	void parse_options_start(struct parse_opt_ctx_t *ctx,
	288	int argc, const char **argv, int flags)
	289	{
	290	memset(ctx, 0, sizeof(*ctx));
	291	ctx->argc = argc - 1;
	292	ctx->argv = argv + 1;
	293	ctx->out = argv;
a32a4eaa	294	ctx->cpidx = ((flags & PARSE_OPT_KEEP_ARGV0) != 0);
7e7bbcb4	295	ctx->flags = flags;
0d260f9a RS	296	if ((flags & PARSE_OPT_KEEP_UNKNOWN) &&
	297	(flags & PARSE_OPT_STOP_AT_NON_OPTION))
	298	die("STOP_AT_NON_OPTION and KEEP_UNKNOWN don't go together");
7e7bbcb4 PH	299	}
7e7bbcb4 PH	300
ee68b87a	301	static int usage_with_options_internal(const char * const *,
ff43ec3e	302	const struct option *, int);
dd3bf0f4	303
ff43ec3e PH	304	int parse_options_step(struct parse_opt_ctx_t *ctx,
	305	const struct option *options,
	306	const char * const usagestr[])
4a59fd13	307	{
b92891f9 RS	308	int internal_help = !(ctx->flags & PARSE_OPT_NO_INTERNAL_HELP);
b92891f9 RS	309
26141b5b PH	310	/* we must reset ->opt, unknown short option leave it dangling */
	311	ctx->opt = NULL;
	312
ff43ec3e PH	313	for (; ctx->argc; ctx->argc--, ctx->argv++) {
ff43ec3e PH	314	const char *arg = ctx->argv[0];
4a59fd13 PH	315
4a59fd13 PH	316	if (*arg != '-' \|\| !arg[1]) {
51a9949e RS	317	if (parse_nodash_opt(ctx, arg, options) == 0)
51a9949e RS	318	continue;
ff43ec3e	319	if (ctx->flags & PARSE_OPT_STOP_AT_NON_OPTION)
a0ec9d25	320	break;
ff43ec3e	321	ctx->out[ctx->cpidx++] = ctx->argv[0];
4a59fd13 PH	322	continue;
	323	}
	324
	325	if (arg[1] != '-') {
ff43ec3e	326	ctx->opt = arg + 1;
b92891f9	327	if (internal_help && *ctx->opt == 'h')
ff43ec3e	328	return parse_options_usage(usagestr, options);
07fe54db PH	329	switch (parse_short_opt(ctx, options)) {
	330	case -1:
	331	return parse_options_usage(usagestr, options);
	332	case -2:
b5ce3a54	333	goto unknown;
07fe54db	334	}
ff43ec3e	335	if (ctx->opt)
3a9f0f41	336	check_typos(arg + 1, options);
ff43ec3e	337	while (ctx->opt) {
b92891f9	338	if (internal_help && *ctx->opt == 'h')
ff43ec3e	339	return parse_options_usage(usagestr, options);
07fe54db PH	340	switch (parse_short_opt(ctx, options)) {
	341	case -1:
	342	return parse_options_usage(usagestr, options);
	343	case -2:
26141b5b PH	344	/* fake a short option thing to hide the fact that we may have
	345	* started to parse aggregated stuff
	346	*
	347	* This is leaky, too bad.
	348	*/
	349	ctx->argv[0] = xstrdup(ctx->opt - 1);
	350	(char )ctx->argv[0] = '-';
b5ce3a54	351	goto unknown;
07fe54db	352	}
3a9f0f41	353	}
4a59fd13 PH	354	continue;
	355	}
	356
	357	if (!arg[2]) { /* "--" */
ff43ec3e PH	358	if (!(ctx->flags & PARSE_OPT_KEEP_DASHDASH)) {
	359	ctx->argc--;
	360	ctx->argv++;
4a59fd13 PH	361	}
	362	break;
	363	}
	364
b92891f9	365	if (internal_help && !strcmp(arg + 2, "help-all"))
ff43ec3e	366	return usage_with_options_internal(usagestr, options, 1);
b92891f9	367	if (internal_help && !strcmp(arg + 2, "help"))
ff43ec3e	368	return parse_options_usage(usagestr, options);
07fe54db PH	369	switch (parse_long_opt(ctx, arg + 2, options)) {
	370	case -1:
	371	return parse_options_usage(usagestr, options);
	372	case -2:
b5ce3a54	373	goto unknown;
07fe54db	374	}
b5ce3a54 RS	375	continue;
	376	unknown:
	377	if (!(ctx->flags & PARSE_OPT_KEEP_UNKNOWN))
	378	return PARSE_OPT_UNKNOWN;
	379	ctx->out[ctx->cpidx++] = ctx->argv[0];
	380	ctx->opt = NULL;
ff43ec3e PH	381	}
	382	return PARSE_OPT_DONE;
	383	}
	384
	385	int parse_options_end(struct parse_opt_ctx_t *ctx)
	386	{
	387	memmove(ctx->out + ctx->cpidx, ctx->argv, ctx->argc * sizeof(*ctx->out));
	388	ctx->out[ctx->cpidx + ctx->argc] = NULL;
	389	return ctx->cpidx + ctx->argc;
	390	}
	391
	392	int parse_options(int argc, const char *argv, const struct option options,
	393	const char * const usagestr[], int flags)
	394	{
	395	struct parse_opt_ctx_t ctx;
	396
	397	parse_options_start(&ctx, argc, argv, flags);
	398	switch (parse_options_step(&ctx, options, usagestr)) {
	399	case PARSE_OPT_HELP:
	400	exit(129);
	401	case PARSE_OPT_DONE:
	402	break;
	403	default: /* PARSE_OPT_UNKNOWN */
07fe54db PH	404	if (ctx.argv[0][1] == '-') {
	405	error("unknown option `%s'", ctx.argv[0] + 2);
	406	} else {
	407	error("unknown switch `%c'", *ctx.opt);
	408	}
	409	usage_with_options(usagestr, options);
4a59fd13 PH	410	}
4a59fd13 PH	411
7e7bbcb4	412	return parse_options_end(&ctx);
4a59fd13	413	}
d7a38c54	414
29f25d49 SB	415	static int usage_argh(const struct option *opts)
	416	{
	417	const char *s;
	418	int literal = opts->flags & PARSE_OPT_LITERAL_ARGHELP;
	419	if (opts->flags & PARSE_OPT_OPTARG)
	420	if (opts->long_name)
	421	s = literal ? "[=%s]" : "[=<%s>]";
	422	else
	423	s = literal ? "[%s]" : "[<%s>]";
	424	else
	425	s = literal ? " %s" : " <%s>";
	426	return fprintf(stderr, s, opts->argh);
	427	}
	428
d7a38c54 PH	429	#define USAGE_OPTS_WIDTH 24
	430	#define USAGE_GAP 2
	431
ee68b87a	432	int usage_with_options_internal(const char * const *usagestr,
ff43ec3e	433	const struct option *opts, int full)
d7a38c54	434	{
49b61802 RS	435	if (!usagestr)
	436	return PARSE_OPT_HELP;
	437
f389c808 AR	438	fprintf(stderr, "usage: %s\n", *usagestr++);
	439	while (usagestr && *usagestr)
	440	fprintf(stderr, " or: %s\n", *usagestr++);
44d86e91 JK	441	while (*usagestr) {
	442	fprintf(stderr, "%s%s\n",
	443	**usagestr ? " " : "",
	444	*usagestr);
	445	usagestr++;
	446	}
d7a38c54 PH	447
d7a38c54 PH	448	if (opts->type != OPTION_GROUP)
f389c808	449	fputc('\n', stderr);
d7a38c54 PH	450
	451	for (; opts->type != OPTION_END; opts++) {
	452	size_t pos;
	453	int pad;
	454
	455	if (opts->type == OPTION_GROUP) {
f389c808	456	fputc('\n', stderr);
d7a38c54	457	if (*opts->help)
f389c808	458	fprintf(stderr, "%s\n", opts->help);
d7a38c54 PH	459	continue;
d7a38c54 PH	460	}
dd3bf0f4 PH	461	if (!full && (opts->flags & PARSE_OPT_HIDDEN))
dd3bf0f4 PH	462	continue;
d7a38c54	463
f389c808	464	pos = fprintf(stderr, " ");
51a9949e RS	465	if (opts->short_name) {
	466	if (opts->flags & PARSE_OPT_NODASH)
	467	pos += fprintf(stderr, "%c", opts->short_name);
	468	else
	469	pos += fprintf(stderr, "-%c", opts->short_name);
	470	}
d7a38c54	471	if (opts->long_name && opts->short_name)
f389c808	472	pos += fprintf(stderr, ", ");
d7a38c54	473	if (opts->long_name)
f389c808	474	pos += fprintf(stderr, "--%s", opts->long_name);
e0319ff5 RS	475	if (opts->type == OPTION_NUMBER)
e0319ff5 RS	476	pos += fprintf(stderr, "-NUM");
d7a38c54 PH	477
d7a38c54 PH	478	switch (opts->type) {
580d5bff PH	479	case OPTION_ARGUMENT:
580d5bff PH	480	break;
d7a38c54	481	case OPTION_INTEGER:
ffe659f9	482	if (opts->flags & PARSE_OPT_OPTARG)
6422f633 MB	483	if (opts->long_name)
	484	pos += fprintf(stderr, "[=<n>]");
	485	else
	486	pos += fprintf(stderr, "[<n>]");
ffe659f9 PH	487	else
ffe659f9 PH	488	pos += fprintf(stderr, " <n>");
d7a38c54	489	break;
ffe659f9	490	case OPTION_CALLBACK:
f481e22a PH	491	if (opts->flags & PARSE_OPT_NOARG)
	492	break;
	493	/* FALLTHROUGH */
	494	case OPTION_STRING:
29f25d49 SB	495	if (opts->argh)
	496	pos += usage_argh(opts);
	497	else {
ffe659f9	498	if (opts->flags & PARSE_OPT_OPTARG)
6422f633 MB	499	if (opts->long_name)
	500	pos += fprintf(stderr, "[=...]");
	501	else
	502	pos += fprintf(stderr, "[...]");
ffe659f9 PH	503	else
	504	pos += fprintf(stderr, " ...");
	505	}
d7a38c54	506	break;
e0319ff5	507	default: /* OPTION_{BIT,BOOLEAN,NUMBER,SET_INT,SET_PTR} */
d7a38c54 PH	508	break;
	509	}
	510
f389c808 AR	511	if (pos <= USAGE_OPTS_WIDTH)
f389c808 AR	512	pad = USAGE_OPTS_WIDTH - pos;
d7a38c54	513	else {
f389c808	514	fputc('\n', stderr);
d7a38c54 PH	515	pad = USAGE_OPTS_WIDTH;
d7a38c54 PH	516	}
f389c808	517	fprintf(stderr, "%*s%s\n", pad + USAGE_GAP, "", opts->help);
d7a38c54	518	}
f389c808 AR	519	fputc('\n', stderr);
f389c808 AR	520
ee68b87a	521	return PARSE_OPT_HELP;
d7a38c54	522	}
0ce865b1	523
dd3bf0f4	524	void usage_with_options(const char * const *usagestr,
ff43ec3e	525	const struct option *opts)
dd3bf0f4	526	{
ff43ec3e PH	527	usage_with_options_internal(usagestr, opts, 0);
ff43ec3e PH	528	exit(129);
dd3bf0f4 PH	529	}
dd3bf0f4 PH	530
ee68b87a PH	531	int parse_options_usage(const char * const *usagestr,
	532	const struct option *opts)
	533	{
ff43ec3e	534	return usage_with_options_internal(usagestr, opts, 0);
ee68b87a PH	535	}
	536
	537
0ce865b1 PH	538	/----- some often used options -----/
0ce865b1 PH	539	#include "cache.h"
db7244bd	540
0ce865b1 PH	541	int parse_opt_abbrev_cb(const struct option opt, const char arg, int unset)
	542	{
	543	int v;
	544
	545	if (!arg) {
	546	v = unset ? 0 : DEFAULT_ABBREV;
	547	} else {
	548	v = strtol(arg, (char **)&arg, 10);
	549	if (*arg)
	550	return opterror(opt, "expects a numerical value", 0);
	551	if (v && v < MINIMUM_ABBREV)
	552	v = MINIMUM_ABBREV;
	553	else if (v > 40)
	554	v = 40;
	555	}
	556	(int )(opt->value) = v;
	557	return 0;
	558	}
1f4a711a MB	559
	560	int parse_opt_approxidate_cb(const struct option opt, const char arg,
	561	int unset)
	562	{
	563	(unsigned long )(opt->value) = approxidate(arg);
	564	return 0;
	565	}
dbd0f5c7	566
7f87aff2 TA	567	int parse_opt_verbosity_cb(const struct option opt, const char arg,
	568	int unset)
	569	{
	570	int *target = opt->value;
	571
	572	if (unset)
	573	/* --no-quiet, --no-verbose */
	574	*target = 0;
	575	else if (opt->short_name == 'v') {
	576	if (*target >= 0)
	577	(*target)++;
	578	else
	579	*target = 1;
	580	} else {
	581	if (*target <= 0)
	582	(*target)--;
	583	else
	584	*target = -1;
	585	}
	586	return 0;
	587	}
	588
269defdf JG	589	int parse_opt_with_commit(const struct option opt, const char arg, int unset)
	590	{
	591	unsigned char sha1[20];
	592	struct commit *commit;
	593
	594	if (!arg)
	595	return -1;
	596	if (get_sha1(arg, sha1))
	597	return error("malformed object name %s", arg);
	598	commit = lookup_commit_reference(sha1);
	599	if (!commit)
	600	return error("no such commit %s", arg);
	601	commit_list_insert(commit, opt->value);
	602	return 0;
	603	}
	604
dbd0f5c7 JH	605	/*
	606	* This should really be OPTION_FILENAME type as a part of
	607	* parse_options that take prefix to do this while parsing.
	608	*/
	609	extern const char parse_options_fix_filename(const char prefix, const char *file)
	610	{
	611	if (!file \|\| !prefix \|\| is_absolute_path(file) \|\| !strcmp("-", file))
	612	return file;
	613	return prefix_filename(prefix, strlen(prefix), file);
	614	}
	615