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

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

#define OPT_SHORT 1
#define OPT_UNSET 2

static inline const char *get_arg(struct parse_opt_ctx_t *p)
{
	if (p->opt) {
		const char *res = p->opt;
		p->opt = NULL;
		return res;
	}
	p->argc--;
	return *++p->argv;
}

static inline const char *skip_prefix(const char *str, const char *prefix)
{
	size_t len = strlen(prefix);
	return strncmp(str, prefix, len) ? NULL : str + len;
}

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_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_SET_INT:
		case OPTION_SET_PTR:
			return opterror(opt, "takes no value", flags);
		default:
			break;
		}
	}

	arg = p->opt ? p->opt : (p->argc > 1 ? p->argv[1] : NULL);
	switch (opt->type) {
	case OPTION_BIT:
		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;
			return 0;
		}
		if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
			*(const char **)opt->value = (const char *)opt->defval;
			return 0;
		}
		if (!arg)
			return opterror(opt, "requires a value", flags);
		*(const char **)opt->value = get_arg(p);
		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 (!arg)
			return opterror(opt, "requires a value", flags);
		return (*opt->callback)(opt, get_arg(p), 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 (!arg)
			return opterror(opt, "requires a value", flags);
		*(int *)opt->value = strtol(get_arg(p), (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)
{
	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);
		}
	}
	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;
}

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->flags = flags;
}

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

		if (*arg != '-' || !arg[1]) {
			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 (*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:
				return PARSE_OPT_UNKNOWN;
			}
			if (ctx->opt)
				check_typos(arg + 1, options);
			while (ctx->opt) {
				if (*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:
					return PARSE_OPT_UNKNOWN;
				}
			}
			continue;
		}

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

		if (!strcmp(arg + 2, "help-all"))
			return usage_with_options_internal(usagestr, options, 1);
		if (!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:
			return PARSE_OPT_UNKNOWN;
		}
	}
	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);
}

#define USAGE_OPTS_WIDTH 24
#define USAGE_GAP         2

int usage_with_options_internal(const char * const *usagestr,
				const struct option *opts, int full)
{
	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)
			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);

		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) {
				if (opts->flags & PARSE_OPT_OPTARG)
					if (opts->long_name)
						pos += fprintf(stderr, "[=<%s>]", opts->argh);
					else
						pos += fprintf(stderr, "[<%s>]", opts->argh);
				else
					pos += fprintf(stderr, " <%s>", opts->argh);
			} 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,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;
}
Commit	Line	Data
4a59fd13 PH	1	#include "git-compat-util.h"
4a59fd13 PH	2	#include "parse-options.h"
4a59fd13 PH	3
	4	#define OPT_SHORT 1
	5	#define OPT_UNSET 2
	6
7e7bbcb4	7	static inline const char get_arg(struct parse_opt_ctx_t p)
4a59fd13 PH	8	{
	9	if (p->opt) {
	10	const char *res = p->opt;
	11	p->opt = NULL;
	12	return res;
	13	}
	14	p->argc--;
	15	return *++p->argv;
	16	}
	17
	18	static inline const char skip_prefix(const char str, const char *prefix)
	19	{
	20	size_t len = strlen(prefix);
	21	return strncmp(str, prefix, len) ? NULL : str + len;
	22	}
	23
	24	static int opterror(const struct option opt, const char reason, int flags)
	25	{
	26	if (flags & OPT_SHORT)
	27	return error("switch `%c' %s", opt->short_name, reason);
	28	if (flags & OPT_UNSET)
	29	return error("option `no-%s' %s", opt->long_name, reason);
	30	return error("option `%s' %s", opt->long_name, reason);
	31	}
	32
7e7bbcb4	33	static int get_value(struct parse_opt_ctx_t *p,
4a59fd13 PH	34	const struct option *opt, int flags)
4a59fd13 PH	35	{
ffe659f9	36	const char s, arg;
db7244bd	37	const int unset = flags & OPT_UNSET;
4a59fd13	38
db7244bd	39	if (unset && p->opt)
4a59fd13	40	return opterror(opt, "takes no value", flags);
db7244bd PH	41	if (unset && (opt->flags & PARSE_OPT_NONEG))
db7244bd PH	42	return opterror(opt, "isn't available", flags);
4a59fd13	43
db7244bd PH	44	if (!(flags & OPT_SHORT) && p->opt) {
	45	switch (opt->type) {
	46	case OPTION_CALLBACK:
	47	if (!(opt->flags & PARSE_OPT_NOARG))
	48	break;
	49	/* FALLTHROUGH */
	50	case OPTION_BOOLEAN:
	51	case OPTION_BIT:
	52	case OPTION_SET_INT:
	53	case OPTION_SET_PTR:
4a59fd13	54	return opterror(opt, "takes no value", flags);
db7244bd PH	55	default:
	56	break;
	57	}
	58	}
	59
	60	arg = p->opt ? p->opt : (p->argc > 1 ? p->argv[1] : NULL);
	61	switch (opt->type) {
	62	case OPTION_BIT:
	63	if (unset)
	64	(int )opt->value &= ~opt->defval;
4a59fd13	65	else
db7244bd PH	66	(int )opt->value \|= opt->defval;
	67	return 0;
	68
	69	case OPTION_BOOLEAN:
	70	(int )opt->value = unset ? 0 : (int )opt->value + 1;
	71	return 0;
	72
	73	case OPTION_SET_INT:
	74	(int )opt->value = unset ? 0 : opt->defval;
	75	return 0;
	76
	77	case OPTION_SET_PTR:
	78	(void )opt->value = unset ? NULL : (void )opt->defval;
4a59fd13 PH	79	return 0;
	80
	81	case OPTION_STRING:
db7244bd PH	82	if (unset) {
db7244bd PH	83	(const char *)opt->value = NULL;
4a59fd13 PH	84	return 0;
4a59fd13 PH	85	}
c43a2483	86	if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
ffe659f9 PH	87	(const char )opt->value = (const char )opt->defval;
	88	return 0;
	89	}
	90	if (!arg)
4a59fd13 PH	91	return opterror(opt, "requires a value", flags);
	92	(const char *)opt->value = get_arg(p);
	93	return 0;
	94
ffe659f9	95	case OPTION_CALLBACK:
db7244bd	96	if (unset)
07fe54db	97	return (*opt->callback)(opt, NULL, 1) ? (-1) : 0;
db7244bd	98	if (opt->flags & PARSE_OPT_NOARG)
07fe54db	99	return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
c43a2483	100	if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
07fe54db	101	return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
ffe659f9 PH	102	if (!arg)
ffe659f9 PH	103	return opterror(opt, "requires a value", flags);
07fe54db	104	return (*opt->callback)(opt, get_arg(p), 0) ? (-1) : 0;
ffe659f9	105
4a59fd13	106	case OPTION_INTEGER:
db7244bd	107	if (unset) {
4a59fd13 PH	108	(int )opt->value = 0;
	109	return 0;
	110	}
c43a2483	111	if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
ffe659f9 PH	112	(int )opt->value = opt->defval;
	113	return 0;
	114	}
	115	if (!arg)
4a59fd13 PH	116	return opterror(opt, "requires a value", flags);
	117	(int )opt->value = strtol(get_arg(p), (char **)&s, 10);
	118	if (*s)
	119	return opterror(opt, "expects a numerical value", flags);
	120	return 0;
	121
	122	default:
	123	die("should not happen, someone must be hit on the forehead");
	124	}
	125	}
	126
7e7bbcb4	127	static int parse_short_opt(struct parse_opt_ctx_t p, const struct option options)
4a59fd13 PH	128	{
	129	for (; options->type != OPTION_END; options++) {
	130	if (options->short_name == *p->opt) {
	131	p->opt = p->opt[1] ? p->opt + 1 : NULL;
	132	return get_value(p, options, OPT_SHORT);
	133	}
	134	}
07fe54db	135	return -2;
4a59fd13 PH	136	}
4a59fd13 PH	137
7e7bbcb4	138	static int parse_long_opt(struct parse_opt_ctx_t p, const char arg,
4a59fd13 PH	139	const struct option *options)
4a59fd13 PH	140	{
7f275b91	141	const char *arg_end = strchr(arg, '=');
243e0614 JS	142	const struct option abbrev_option = NULL, ambiguous_option = NULL;
243e0614 JS	143	int abbrev_flags = 0, ambiguous_flags = 0;
7f275b91 JS	144
	145	if (!arg_end)
	146	arg_end = arg + strlen(arg);
	147
4a59fd13 PH	148	for (; options->type != OPTION_END; options++) {
	149	const char *rest;
	150	int flags = 0;
	151
	152	if (!options->long_name)
	153	continue;
	154
	155	rest = skip_prefix(arg, options->long_name);
580d5bff PH	156	if (options->type == OPTION_ARGUMENT) {
	157	if (!rest)
	158	continue;
	159	if (*rest == '=')
	160	return opterror(options, "takes no value", flags);
	161	if (*rest)
	162	continue;
	163	p->out[p->cpidx++] = arg - 2;
	164	return 0;
	165	}
4a59fd13	166	if (!rest) {
7f275b91 JS	167	/* abbreviated? */
	168	if (!strncmp(options->long_name, arg, arg_end - arg)) {
	169	is_abbreviated:
243e0614 JS	170	if (abbrev_option) {
	171	/*
	172	* If this is abbreviated, it is
	173	* ambiguous. So when there is no
	174	* exact match later, we need to
	175	* error out.
	176	*/
	177	ambiguous_option = abbrev_option;
	178	ambiguous_flags = abbrev_flags;
	179	}
7f275b91 JS	180	if (!(flags & OPT_UNSET) && *arg_end)
	181	p->opt = arg_end + 1;
	182	abbrev_option = options;
	183	abbrev_flags = flags;
	184	continue;
	185	}
	186	/* negated and abbreviated very much? */
	187	if (!prefixcmp("no-", arg)) {
	188	flags \|= OPT_UNSET;
	189	goto is_abbreviated;
	190	}
	191	/* negated? */
4a59fd13 PH	192	if (strncmp(arg, "no-", 3))
	193	continue;
	194	flags \|= OPT_UNSET;
	195	rest = skip_prefix(arg + 3, options->long_name);
7f275b91 JS	196	/* abbreviated and negated? */
	197	if (!rest && !prefixcmp(options->long_name, arg + 3))
	198	goto is_abbreviated;
4a59fd13 PH	199	if (!rest)
	200	continue;
	201	}
	202	if (*rest) {
	203	if (*rest != '=')
	204	continue;
	205	p->opt = rest + 1;
	206	}
	207	return get_value(p, options, flags);
	208	}
243e0614 JS	209
	210	if (ambiguous_option)
	211	return error("Ambiguous option: %s "
	212	"(could be --%s%s or --%s%s)",
	213	arg,
	214	(ambiguous_flags & OPT_UNSET) ? "no-" : "",
	215	ambiguous_option->long_name,
	216	(abbrev_flags & OPT_UNSET) ? "no-" : "",
	217	abbrev_option->long_name);
7f275b91 JS	218	if (abbrev_option)
7f275b91 JS	219	return get_value(p, abbrev_option, abbrev_flags);
07fe54db	220	return -2;
4a59fd13 PH	221	}
4a59fd13 PH	222
3a9f0f41 PH	223	void check_typos(const char arg, const struct option options)
	224	{
	225	if (strlen(arg) < 3)
	226	return;
	227
	228	if (!prefixcmp(arg, "no-")) {
	229	error ("did you mean `--%s` (with two dashes ?)", arg);
	230	exit(129);
	231	}
	232
	233	for (; options->type != OPTION_END; options++) {
	234	if (!options->long_name)
	235	continue;
	236	if (!prefixcmp(options->long_name, arg)) {
	237	error ("did you mean `--%s` (with two dashes ?)", arg);
	238	exit(129);
	239	}
	240	}
	241	}
	242
7e7bbcb4 PH	243	void parse_options_start(struct parse_opt_ctx_t *ctx,
	244	int argc, const char **argv, int flags)
	245	{
	246	memset(ctx, 0, sizeof(*ctx));
	247	ctx->argc = argc - 1;
	248	ctx->argv = argv + 1;
	249	ctx->out = argv;
	250	ctx->flags = flags;
	251	}
	252
ee68b87a	253	static int usage_with_options_internal(const char * const *,
ff43ec3e	254	const struct option *, int);
dd3bf0f4	255
ff43ec3e PH	256	int parse_options_step(struct parse_opt_ctx_t *ctx,
	257	const struct option *options,
	258	const char * const usagestr[])
4a59fd13	259	{
ff43ec3e PH	260	for (; ctx->argc; ctx->argc--, ctx->argv++) {
ff43ec3e PH	261	const char *arg = ctx->argv[0];
4a59fd13 PH	262
4a59fd13 PH	263	if (*arg != '-' \|\| !arg[1]) {
ff43ec3e	264	if (ctx->flags & PARSE_OPT_STOP_AT_NON_OPTION)
a0ec9d25	265	break;
ff43ec3e	266	ctx->out[ctx->cpidx++] = ctx->argv[0];
4a59fd13 PH	267	continue;
	268	}
	269
	270	if (arg[1] != '-') {
ff43ec3e PH	271	ctx->opt = arg + 1;
	272	if (*ctx->opt == 'h')
	273	return parse_options_usage(usagestr, options);
07fe54db PH	274	switch (parse_short_opt(ctx, options)) {
	275	case -1:
	276	return parse_options_usage(usagestr, options);
	277	case -2:
	278	return PARSE_OPT_UNKNOWN;
	279	}
ff43ec3e	280	if (ctx->opt)
3a9f0f41	281	check_typos(arg + 1, options);
ff43ec3e PH	282	while (ctx->opt) {
	283	if (*ctx->opt == 'h')
	284	return parse_options_usage(usagestr, options);
07fe54db PH	285	switch (parse_short_opt(ctx, options)) {
	286	case -1:
	287	return parse_options_usage(usagestr, options);
	288	case -2:
	289	return PARSE_OPT_UNKNOWN;
	290	}
3a9f0f41	291	}
4a59fd13 PH	292	continue;
	293	}
	294
	295	if (!arg[2]) { /* "--" */
ff43ec3e PH	296	if (!(ctx->flags & PARSE_OPT_KEEP_DASHDASH)) {
	297	ctx->argc--;
	298	ctx->argv++;
4a59fd13 PH	299	}
	300	break;
	301	}
	302
dd3bf0f4	303	if (!strcmp(arg + 2, "help-all"))
ff43ec3e	304	return usage_with_options_internal(usagestr, options, 1);
4a59fd13	305	if (!strcmp(arg + 2, "help"))
ff43ec3e	306	return parse_options_usage(usagestr, options);
07fe54db PH	307	switch (parse_long_opt(ctx, arg + 2, options)) {
	308	case -1:
	309	return parse_options_usage(usagestr, options);
	310	case -2:
	311	return PARSE_OPT_UNKNOWN;
	312	}
ff43ec3e PH	313	}
	314	return PARSE_OPT_DONE;
	315	}
	316
	317	int parse_options_end(struct parse_opt_ctx_t *ctx)
	318	{
	319	memmove(ctx->out + ctx->cpidx, ctx->argv, ctx->argc * sizeof(*ctx->out));
	320	ctx->out[ctx->cpidx + ctx->argc] = NULL;
	321	return ctx->cpidx + ctx->argc;
	322	}
	323
	324	int parse_options(int argc, const char *argv, const struct option options,
	325	const char * const usagestr[], int flags)
	326	{
	327	struct parse_opt_ctx_t ctx;
	328
	329	parse_options_start(&ctx, argc, argv, flags);
	330	switch (parse_options_step(&ctx, options, usagestr)) {
	331	case PARSE_OPT_HELP:
	332	exit(129);
	333	case PARSE_OPT_DONE:
	334	break;
	335	default: /* PARSE_OPT_UNKNOWN */
07fe54db PH	336	if (ctx.argv[0][1] == '-') {
	337	error("unknown option `%s'", ctx.argv[0] + 2);
	338	} else {
	339	error("unknown switch `%c'", *ctx.opt);
	340	}
	341	usage_with_options(usagestr, options);
4a59fd13 PH	342	}
4a59fd13 PH	343
7e7bbcb4	344	return parse_options_end(&ctx);
4a59fd13	345	}
d7a38c54 PH	346
	347	#define USAGE_OPTS_WIDTH 24
	348	#define USAGE_GAP 2
	349
ee68b87a	350	int usage_with_options_internal(const char * const *usagestr,
ff43ec3e	351	const struct option *opts, int full)
d7a38c54	352	{
f389c808 AR	353	fprintf(stderr, "usage: %s\n", *usagestr++);
	354	while (usagestr && *usagestr)
	355	fprintf(stderr, " or: %s\n", *usagestr++);
44d86e91 JK	356	while (*usagestr) {
	357	fprintf(stderr, "%s%s\n",
	358	**usagestr ? " " : "",
	359	*usagestr);
	360	usagestr++;
	361	}
d7a38c54 PH	362
d7a38c54 PH	363	if (opts->type != OPTION_GROUP)
f389c808	364	fputc('\n', stderr);
d7a38c54 PH	365
	366	for (; opts->type != OPTION_END; opts++) {
	367	size_t pos;
	368	int pad;
	369
	370	if (opts->type == OPTION_GROUP) {
f389c808	371	fputc('\n', stderr);
d7a38c54	372	if (*opts->help)
f389c808	373	fprintf(stderr, "%s\n", opts->help);
d7a38c54 PH	374	continue;
d7a38c54 PH	375	}
dd3bf0f4 PH	376	if (!full && (opts->flags & PARSE_OPT_HIDDEN))
dd3bf0f4 PH	377	continue;
d7a38c54	378
f389c808	379	pos = fprintf(stderr, " ");
d7a38c54	380	if (opts->short_name)
f389c808	381	pos += fprintf(stderr, "-%c", opts->short_name);
d7a38c54	382	if (opts->long_name && opts->short_name)
f389c808	383	pos += fprintf(stderr, ", ");
d7a38c54	384	if (opts->long_name)
f389c808	385	pos += fprintf(stderr, "--%s", opts->long_name);
d7a38c54 PH	386
d7a38c54 PH	387	switch (opts->type) {
580d5bff PH	388	case OPTION_ARGUMENT:
580d5bff PH	389	break;
d7a38c54	390	case OPTION_INTEGER:
ffe659f9	391	if (opts->flags & PARSE_OPT_OPTARG)
6422f633 MB	392	if (opts->long_name)
	393	pos += fprintf(stderr, "[=<n>]");
	394	else
	395	pos += fprintf(stderr, "[<n>]");
ffe659f9 PH	396	else
ffe659f9 PH	397	pos += fprintf(stderr, " <n>");
d7a38c54	398	break;
ffe659f9	399	case OPTION_CALLBACK:
f481e22a PH	400	if (opts->flags & PARSE_OPT_NOARG)
	401	break;
	402	/* FALLTHROUGH */
	403	case OPTION_STRING:
ffe659f9 PH	404	if (opts->argh) {
ffe659f9 PH	405	if (opts->flags & PARSE_OPT_OPTARG)
6422f633 MB	406	if (opts->long_name)
	407	pos += fprintf(stderr, "[=<%s>]", opts->argh);
	408	else
	409	pos += fprintf(stderr, "[<%s>]", opts->argh);
ffe659f9 PH	410	else
	411	pos += fprintf(stderr, " <%s>", opts->argh);
	412	} else {
	413	if (opts->flags & PARSE_OPT_OPTARG)
6422f633 MB	414	if (opts->long_name)
	415	pos += fprintf(stderr, "[=...]");
	416	else
	417	pos += fprintf(stderr, "[...]");
ffe659f9 PH	418	else
	419	pos += fprintf(stderr, " ...");
	420	}
d7a38c54	421	break;
db7244bd	422	default: /* OPTION_{BIT,BOOLEAN,SET_INT,SET_PTR} */
d7a38c54 PH	423	break;
	424	}
	425
f389c808 AR	426	if (pos <= USAGE_OPTS_WIDTH)
f389c808 AR	427	pad = USAGE_OPTS_WIDTH - pos;
d7a38c54	428	else {
f389c808	429	fputc('\n', stderr);
d7a38c54 PH	430	pad = USAGE_OPTS_WIDTH;
d7a38c54 PH	431	}
f389c808	432	fprintf(stderr, "%*s%s\n", pad + USAGE_GAP, "", opts->help);
d7a38c54	433	}
f389c808 AR	434	fputc('\n', stderr);
f389c808 AR	435
ee68b87a	436	return PARSE_OPT_HELP;
d7a38c54	437	}
0ce865b1	438
dd3bf0f4	439	void usage_with_options(const char * const *usagestr,
ff43ec3e	440	const struct option *opts)
dd3bf0f4	441	{
ff43ec3e PH	442	usage_with_options_internal(usagestr, opts, 0);
ff43ec3e PH	443	exit(129);
dd3bf0f4 PH	444	}
dd3bf0f4 PH	445
ee68b87a PH	446	int parse_options_usage(const char * const *usagestr,
	447	const struct option *opts)
	448	{
ff43ec3e	449	return usage_with_options_internal(usagestr, opts, 0);
ee68b87a PH	450	}
	451
	452
0ce865b1 PH	453	/----- some often used options -----/
0ce865b1 PH	454	#include "cache.h"
db7244bd	455
0ce865b1 PH	456	int parse_opt_abbrev_cb(const struct option opt, const char arg, int unset)
	457	{
	458	int v;
	459
	460	if (!arg) {
	461	v = unset ? 0 : DEFAULT_ABBREV;
	462	} else {
	463	v = strtol(arg, (char **)&arg, 10);
	464	if (*arg)
	465	return opterror(opt, "expects a numerical value", 0);
	466	if (v && v < MINIMUM_ABBREV)
	467	v = MINIMUM_ABBREV;
	468	else if (v > 40)
	469	v = 40;
	470	}
	471	(int )(opt->value) = v;
	472	return 0;
	473	}
1f4a711a MB	474
	475	int parse_opt_approxidate_cb(const struct option opt, const char arg,
	476	int unset)
	477	{
	478	(unsigned long )(opt->value) = approxidate(arg);
	479	return 0;
	480	}