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

#include "git-compat-util.h"
#include "parse-options.h"
#include "cache.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->cpidx = ((flags & PARSE_OPT_KEEP_ARGV0) != 0);
	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[])
{
	/* 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 (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:
					/* 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] = '-';
					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"
26141b5b	3	#include "cache.h"
4a59fd13 PH	4
	5	#define OPT_SHORT 1
	6	#define OPT_UNSET 2
	7
7e7bbcb4	8	static inline const char get_arg(struct parse_opt_ctx_t p)
4a59fd13 PH	9	{
	10	if (p->opt) {
	11	const char *res = p->opt;
	12	p->opt = NULL;
	13	return res;
	14	}
	15	p->argc--;
	16	return *++p->argv;
	17	}
	18
	19	static inline const char skip_prefix(const char str, const char *prefix)
	20	{
	21	size_t len = strlen(prefix);
	22	return strncmp(str, prefix, len) ? NULL : str + len;
	23	}
	24
	25	static int opterror(const struct option opt, const char reason, int flags)
	26	{
	27	if (flags & OPT_SHORT)
	28	return error("switch `%c' %s", opt->short_name, reason);
	29	if (flags & OPT_UNSET)
	30	return error("option `no-%s' %s", opt->long_name, reason);
	31	return error("option `%s' %s", opt->long_name, reason);
	32	}
	33
7e7bbcb4	34	static int get_value(struct parse_opt_ctx_t *p,
4a59fd13 PH	35	const struct option *opt, int flags)
4a59fd13 PH	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:
	53	case OPTION_SET_INT:
	54	case OPTION_SET_PTR:
4a59fd13	55	return opterror(opt, "takes no value", flags);
db7244bd PH	56	default:
	57	break;
	58	}
	59	}
	60
	61	arg = p->opt ? p->opt : (p->argc > 1 ? p->argv[1] : NULL);
	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
	70	case OPTION_BOOLEAN:
	71	(int )opt->value = unset ? 0 : (int )opt->value + 1;
	72	return 0;
	73
	74	case OPTION_SET_INT:
	75	(int )opt->value = unset ? 0 : opt->defval;
	76	return 0;
	77
	78	case OPTION_SET_PTR:
	79	(void )opt->value = unset ? NULL : (void )opt->defval;
4a59fd13 PH	80	return 0;
	81
	82	case OPTION_STRING:
db7244bd PH	83	if (unset) {
db7244bd PH	84	(const char *)opt->value = NULL;
4a59fd13 PH	85	return 0;
4a59fd13 PH	86	}
c43a2483	87	if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
ffe659f9 PH	88	(const char )opt->value = (const char )opt->defval;
	89	return 0;
	90	}
	91	if (!arg)
4a59fd13 PH	92	return opterror(opt, "requires a value", flags);
	93	(const char *)opt->value = get_arg(p);
	94	return 0;
	95
ffe659f9	96	case OPTION_CALLBACK:
db7244bd	97	if (unset)
07fe54db	98	return (*opt->callback)(opt, NULL, 1) ? (-1) : 0;
db7244bd	99	if (opt->flags & PARSE_OPT_NOARG)
07fe54db	100	return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
c43a2483	101	if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
07fe54db	102	return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
ffe659f9 PH	103	if (!arg)
ffe659f9 PH	104	return opterror(opt, "requires a value", flags);
07fe54db	105	return (*opt->callback)(opt, get_arg(p), 0) ? (-1) : 0;
ffe659f9	106
4a59fd13	107	case OPTION_INTEGER:
db7244bd	108	if (unset) {
4a59fd13 PH	109	(int )opt->value = 0;
	110	return 0;
	111	}
c43a2483	112	if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
ffe659f9 PH	113	(int )opt->value = opt->defval;
	114	return 0;
	115	}
	116	if (!arg)
4a59fd13 PH	117	return opterror(opt, "requires a value", flags);
	118	(int )opt->value = strtol(get_arg(p), (char **)&s, 10);
	119	if (*s)
	120	return opterror(opt, "expects a numerical value", flags);
	121	return 0;
	122
	123	default:
	124	die("should not happen, someone must be hit on the forehead");
	125	}
	126	}
	127
7e7bbcb4	128	static int parse_short_opt(struct parse_opt_ctx_t p, const struct option options)
4a59fd13 PH	129	{
	130	for (; options->type != OPTION_END; options++) {
	131	if (options->short_name == *p->opt) {
	132	p->opt = p->opt[1] ? p->opt + 1 : NULL;
	133	return get_value(p, options, OPT_SHORT);
	134	}
	135	}
07fe54db	136	return -2;
4a59fd13 PH	137	}
4a59fd13 PH	138
7e7bbcb4	139	static int parse_long_opt(struct parse_opt_ctx_t p, const char arg,
4a59fd13 PH	140	const struct option *options)
4a59fd13 PH	141	{
7f275b91	142	const char *arg_end = strchr(arg, '=');
243e0614 JS	143	const struct option abbrev_option = NULL, ambiguous_option = NULL;
243e0614 JS	144	int abbrev_flags = 0, ambiguous_flags = 0;
7f275b91 JS	145
	146	if (!arg_end)
	147	arg_end = arg + strlen(arg);
	148
4a59fd13 PH	149	for (; options->type != OPTION_END; options++) {
	150	const char *rest;
	151	int flags = 0;
	152
	153	if (!options->long_name)
	154	continue;
	155
	156	rest = skip_prefix(arg, options->long_name);
580d5bff PH	157	if (options->type == OPTION_ARGUMENT) {
	158	if (!rest)
	159	continue;
	160	if (*rest == '=')
	161	return opterror(options, "takes no value", flags);
	162	if (*rest)
	163	continue;
	164	p->out[p->cpidx++] = arg - 2;
	165	return 0;
	166	}
4a59fd13	167	if (!rest) {
7f275b91 JS	168	/* abbreviated? */
	169	if (!strncmp(options->long_name, arg, arg_end - arg)) {
	170	is_abbreviated:
243e0614 JS	171	if (abbrev_option) {
	172	/*
	173	* If this is abbreviated, it is
	174	* ambiguous. So when there is no
	175	* exact match later, we need to
	176	* error out.
	177	*/
	178	ambiguous_option = abbrev_option;
	179	ambiguous_flags = abbrev_flags;
	180	}
7f275b91 JS	181	if (!(flags & OPT_UNSET) && *arg_end)
	182	p->opt = arg_end + 1;
	183	abbrev_option = options;
	184	abbrev_flags = flags;
	185	continue;
	186	}
	187	/* negated and abbreviated very much? */
	188	if (!prefixcmp("no-", arg)) {
	189	flags \|= OPT_UNSET;
	190	goto is_abbreviated;
	191	}
	192	/* negated? */
4a59fd13 PH	193	if (strncmp(arg, "no-", 3))
	194	continue;
	195	flags \|= OPT_UNSET;
	196	rest = skip_prefix(arg + 3, options->long_name);
7f275b91 JS	197	/* abbreviated and negated? */
	198	if (!rest && !prefixcmp(options->long_name, arg + 3))
	199	goto is_abbreviated;
4a59fd13 PH	200	if (!rest)
	201	continue;
	202	}
	203	if (*rest) {
	204	if (*rest != '=')
	205	continue;
	206	p->opt = rest + 1;
	207	}
	208	return get_value(p, options, flags);
	209	}
243e0614 JS	210
	211	if (ambiguous_option)
	212	return error("Ambiguous option: %s "
	213	"(could be --%s%s or --%s%s)",
	214	arg,
	215	(ambiguous_flags & OPT_UNSET) ? "no-" : "",
	216	ambiguous_option->long_name,
	217	(abbrev_flags & OPT_UNSET) ? "no-" : "",
	218	abbrev_option->long_name);
7f275b91 JS	219	if (abbrev_option)
7f275b91 JS	220	return get_value(p, abbrev_option, abbrev_flags);
07fe54db	221	return -2;
4a59fd13 PH	222	}
4a59fd13 PH	223
3a9f0f41 PH	224	void check_typos(const char arg, const struct option options)
	225	{
	226	if (strlen(arg) < 3)
	227	return;
	228
	229	if (!prefixcmp(arg, "no-")) {
	230	error ("did you mean `--%s` (with two dashes ?)", arg);
	231	exit(129);
	232	}
	233
	234	for (; options->type != OPTION_END; options++) {
	235	if (!options->long_name)
	236	continue;
	237	if (!prefixcmp(options->long_name, arg)) {
	238	error ("did you mean `--%s` (with two dashes ?)", arg);
	239	exit(129);
	240	}
	241	}
	242	}
	243
7e7bbcb4 PH	244	void parse_options_start(struct parse_opt_ctx_t *ctx,
	245	int argc, const char **argv, int flags)
	246	{
	247	memset(ctx, 0, sizeof(*ctx));
	248	ctx->argc = argc - 1;
	249	ctx->argv = argv + 1;
	250	ctx->out = argv;
a32a4eaa	251	ctx->cpidx = ((flags & PARSE_OPT_KEEP_ARGV0) != 0);
7e7bbcb4 PH	252	ctx->flags = flags;
	253	}
	254
ee68b87a	255	static int usage_with_options_internal(const char * const *,
ff43ec3e	256	const struct option *, int);
dd3bf0f4	257
ff43ec3e PH	258	int parse_options_step(struct parse_opt_ctx_t *ctx,
	259	const struct option *options,
	260	const char * const usagestr[])
4a59fd13	261	{
26141b5b PH	262	/* we must reset ->opt, unknown short option leave it dangling */
	263	ctx->opt = NULL;
	264
ff43ec3e PH	265	for (; ctx->argc; ctx->argc--, ctx->argv++) {
ff43ec3e PH	266	const char *arg = ctx->argv[0];
4a59fd13 PH	267
4a59fd13 PH	268	if (*arg != '-' \|\| !arg[1]) {
ff43ec3e	269	if (ctx->flags & PARSE_OPT_STOP_AT_NON_OPTION)
a0ec9d25	270	break;
ff43ec3e	271	ctx->out[ctx->cpidx++] = ctx->argv[0];
4a59fd13 PH	272	continue;
	273	}
	274
	275	if (arg[1] != '-') {
ff43ec3e PH	276	ctx->opt = arg + 1;
	277	if (*ctx->opt == 'h')
	278	return parse_options_usage(usagestr, options);
07fe54db PH	279	switch (parse_short_opt(ctx, options)) {
	280	case -1:
	281	return parse_options_usage(usagestr, options);
	282	case -2:
	283	return PARSE_OPT_UNKNOWN;
	284	}
ff43ec3e	285	if (ctx->opt)
3a9f0f41	286	check_typos(arg + 1, options);
ff43ec3e PH	287	while (ctx->opt) {
	288	if (*ctx->opt == 'h')
	289	return parse_options_usage(usagestr, options);
07fe54db PH	290	switch (parse_short_opt(ctx, options)) {
	291	case -1:
	292	return parse_options_usage(usagestr, options);
	293	case -2:
26141b5b PH	294	/* fake a short option thing to hide the fact that we may have
	295	* started to parse aggregated stuff
	296	*
	297	* This is leaky, too bad.
	298	*/
	299	ctx->argv[0] = xstrdup(ctx->opt - 1);
	300	(char )ctx->argv[0] = '-';
07fe54db PH	301	return PARSE_OPT_UNKNOWN;
07fe54db PH	302	}
3a9f0f41	303	}
4a59fd13 PH	304	continue;
	305	}
	306
	307	if (!arg[2]) { /* "--" */
ff43ec3e PH	308	if (!(ctx->flags & PARSE_OPT_KEEP_DASHDASH)) {
	309	ctx->argc--;
	310	ctx->argv++;
4a59fd13 PH	311	}
	312	break;
	313	}
	314
dd3bf0f4	315	if (!strcmp(arg + 2, "help-all"))
ff43ec3e	316	return usage_with_options_internal(usagestr, options, 1);
4a59fd13	317	if (!strcmp(arg + 2, "help"))
ff43ec3e	318	return parse_options_usage(usagestr, options);
07fe54db PH	319	switch (parse_long_opt(ctx, arg + 2, options)) {
	320	case -1:
	321	return parse_options_usage(usagestr, options);
	322	case -2:
	323	return PARSE_OPT_UNKNOWN;
	324	}
ff43ec3e PH	325	}
	326	return PARSE_OPT_DONE;
	327	}
	328
	329	int parse_options_end(struct parse_opt_ctx_t *ctx)
	330	{
	331	memmove(ctx->out + ctx->cpidx, ctx->argv, ctx->argc * sizeof(*ctx->out));
	332	ctx->out[ctx->cpidx + ctx->argc] = NULL;
	333	return ctx->cpidx + ctx->argc;
	334	}
	335
	336	int parse_options(int argc, const char *argv, const struct option options,
	337	const char * const usagestr[], int flags)
	338	{
	339	struct parse_opt_ctx_t ctx;
	340
	341	parse_options_start(&ctx, argc, argv, flags);
	342	switch (parse_options_step(&ctx, options, usagestr)) {
	343	case PARSE_OPT_HELP:
	344	exit(129);
	345	case PARSE_OPT_DONE:
	346	break;
	347	default: /* PARSE_OPT_UNKNOWN */
07fe54db PH	348	if (ctx.argv[0][1] == '-') {
	349	error("unknown option `%s'", ctx.argv[0] + 2);
	350	} else {
	351	error("unknown switch `%c'", *ctx.opt);
	352	}
	353	usage_with_options(usagestr, options);
4a59fd13 PH	354	}
4a59fd13 PH	355
7e7bbcb4	356	return parse_options_end(&ctx);
4a59fd13	357	}
d7a38c54 PH	358
	359	#define USAGE_OPTS_WIDTH 24
	360	#define USAGE_GAP 2
	361
ee68b87a	362	int usage_with_options_internal(const char * const *usagestr,
ff43ec3e	363	const struct option *opts, int full)
d7a38c54	364	{
f389c808 AR	365	fprintf(stderr, "usage: %s\n", *usagestr++);
	366	while (usagestr && *usagestr)
	367	fprintf(stderr, " or: %s\n", *usagestr++);
44d86e91 JK	368	while (*usagestr) {
	369	fprintf(stderr, "%s%s\n",
	370	**usagestr ? " " : "",
	371	*usagestr);
	372	usagestr++;
	373	}
d7a38c54 PH	374
d7a38c54 PH	375	if (opts->type != OPTION_GROUP)
f389c808	376	fputc('\n', stderr);
d7a38c54 PH	377
	378	for (; opts->type != OPTION_END; opts++) {
	379	size_t pos;
	380	int pad;
	381
	382	if (opts->type == OPTION_GROUP) {
f389c808	383	fputc('\n', stderr);
d7a38c54	384	if (*opts->help)
f389c808	385	fprintf(stderr, "%s\n", opts->help);
d7a38c54 PH	386	continue;
d7a38c54 PH	387	}
dd3bf0f4 PH	388	if (!full && (opts->flags & PARSE_OPT_HIDDEN))
dd3bf0f4 PH	389	continue;
d7a38c54	390
f389c808	391	pos = fprintf(stderr, " ");
d7a38c54	392	if (opts->short_name)
f389c808	393	pos += fprintf(stderr, "-%c", opts->short_name);
d7a38c54	394	if (opts->long_name && opts->short_name)
f389c808	395	pos += fprintf(stderr, ", ");
d7a38c54	396	if (opts->long_name)
f389c808	397	pos += fprintf(stderr, "--%s", opts->long_name);
d7a38c54 PH	398
d7a38c54 PH	399	switch (opts->type) {
580d5bff PH	400	case OPTION_ARGUMENT:
580d5bff PH	401	break;
d7a38c54	402	case OPTION_INTEGER:
ffe659f9	403	if (opts->flags & PARSE_OPT_OPTARG)
6422f633 MB	404	if (opts->long_name)
	405	pos += fprintf(stderr, "[=<n>]");
	406	else
	407	pos += fprintf(stderr, "[<n>]");
ffe659f9 PH	408	else
ffe659f9 PH	409	pos += fprintf(stderr, " <n>");
d7a38c54	410	break;
ffe659f9	411	case OPTION_CALLBACK:
f481e22a PH	412	if (opts->flags & PARSE_OPT_NOARG)
	413	break;
	414	/* FALLTHROUGH */
	415	case OPTION_STRING:
ffe659f9 PH	416	if (opts->argh) {
ffe659f9 PH	417	if (opts->flags & PARSE_OPT_OPTARG)
6422f633 MB	418	if (opts->long_name)
	419	pos += fprintf(stderr, "[=<%s>]", opts->argh);
	420	else
	421	pos += fprintf(stderr, "[<%s>]", opts->argh);
ffe659f9 PH	422	else
	423	pos += fprintf(stderr, " <%s>", opts->argh);
	424	} else {
	425	if (opts->flags & PARSE_OPT_OPTARG)
6422f633 MB	426	if (opts->long_name)
	427	pos += fprintf(stderr, "[=...]");
	428	else
	429	pos += fprintf(stderr, "[...]");
ffe659f9 PH	430	else
	431	pos += fprintf(stderr, " ...");
	432	}
d7a38c54	433	break;
db7244bd	434	default: /* OPTION_{BIT,BOOLEAN,SET_INT,SET_PTR} */
d7a38c54 PH	435	break;
	436	}
	437
f389c808 AR	438	if (pos <= USAGE_OPTS_WIDTH)
f389c808 AR	439	pad = USAGE_OPTS_WIDTH - pos;
d7a38c54	440	else {
f389c808	441	fputc('\n', stderr);
d7a38c54 PH	442	pad = USAGE_OPTS_WIDTH;
d7a38c54 PH	443	}
f389c808	444	fprintf(stderr, "%*s%s\n", pad + USAGE_GAP, "", opts->help);
d7a38c54	445	}
f389c808 AR	446	fputc('\n', stderr);
f389c808 AR	447
ee68b87a	448	return PARSE_OPT_HELP;
d7a38c54	449	}
0ce865b1	450
dd3bf0f4	451	void usage_with_options(const char * const *usagestr,
ff43ec3e	452	const struct option *opts)
dd3bf0f4	453	{
ff43ec3e PH	454	usage_with_options_internal(usagestr, opts, 0);
ff43ec3e PH	455	exit(129);
dd3bf0f4 PH	456	}
dd3bf0f4 PH	457
ee68b87a PH	458	int parse_options_usage(const char * const *usagestr,
	459	const struct option *opts)
	460	{
ff43ec3e	461	return usage_with_options_internal(usagestr, opts, 0);
ee68b87a PH	462	}
	463
	464
0ce865b1 PH	465	/----- some often used options -----/
0ce865b1 PH	466	#include "cache.h"
db7244bd	467
0ce865b1 PH	468	int parse_opt_abbrev_cb(const struct option opt, const char arg, int unset)
	469	{
	470	int v;
	471
	472	if (!arg) {
	473	v = unset ? 0 : DEFAULT_ABBREV;
	474	} else {
	475	v = strtol(arg, (char **)&arg, 10);
	476	if (*arg)
	477	return opterror(opt, "expects a numerical value", 0);
	478	if (v && v < MINIMUM_ABBREV)
	479	v = MINIMUM_ABBREV;
	480	else if (v > 40)
	481	v = 40;
	482	}
	483	(int )(opt->value) = v;
	484	return 0;
	485	}
1f4a711a MB	486
	487	int parse_opt_approxidate_cb(const struct option opt, const char arg,
	488	int unset)
	489	{
	490	(unsigned long )(opt->value) = approxidate(arg);
	491	return 0;
	492	}