[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)
{
	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;
}

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 (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);
}

#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)
			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;
}

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 PH	131	{
	132	for (; options->type != OPTION_END; options++) {
	133	if (options->short_name == *p->opt) {
	134	p->opt = p->opt[1] ? p->opt + 1 : NULL;
	135	return get_value(p, options, OPT_SHORT);
	136	}
	137	}
07fe54db	138	return -2;
4a59fd13 PH	139	}
4a59fd13 PH	140
7e7bbcb4	141	static int parse_long_opt(struct parse_opt_ctx_t p, const char arg,
4a59fd13 PH	142	const struct option *options)
4a59fd13 PH	143	{
7f275b91	144	const char *arg_end = strchr(arg, '=');
243e0614 JS	145	const struct option abbrev_option = NULL, ambiguous_option = NULL;
243e0614 JS	146	int abbrev_flags = 0, ambiguous_flags = 0;
7f275b91 JS	147
	148	if (!arg_end)
	149	arg_end = arg + strlen(arg);
	150
4a59fd13 PH	151	for (; options->type != OPTION_END; options++) {
	152	const char *rest;
	153	int flags = 0;
	154
	155	if (!options->long_name)
	156	continue;
	157
	158	rest = skip_prefix(arg, options->long_name);
580d5bff PH	159	if (options->type == OPTION_ARGUMENT) {
	160	if (!rest)
	161	continue;
	162	if (*rest == '=')
	163	return opterror(options, "takes no value", flags);
	164	if (*rest)
	165	continue;
	166	p->out[p->cpidx++] = arg - 2;
	167	return 0;
	168	}
4a59fd13	169	if (!rest) {
7f275b91 JS	170	/* abbreviated? */
	171	if (!strncmp(options->long_name, arg, arg_end - arg)) {
	172	is_abbreviated:
243e0614 JS	173	if (abbrev_option) {
	174	/*
	175	* If this is abbreviated, it is
	176	* ambiguous. So when there is no
	177	* exact match later, we need to
	178	* error out.
	179	*/
	180	ambiguous_option = abbrev_option;
	181	ambiguous_flags = abbrev_flags;
	182	}
7f275b91 JS	183	if (!(flags & OPT_UNSET) && *arg_end)
	184	p->opt = arg_end + 1;
	185	abbrev_option = options;
	186	abbrev_flags = flags;
	187	continue;
	188	}
	189	/* negated and abbreviated very much? */
	190	if (!prefixcmp("no-", arg)) {
	191	flags \|= OPT_UNSET;
	192	goto is_abbreviated;
	193	}
	194	/* negated? */
4a59fd13 PH	195	if (strncmp(arg, "no-", 3))
	196	continue;
	197	flags \|= OPT_UNSET;
	198	rest = skip_prefix(arg + 3, options->long_name);
7f275b91 JS	199	/* abbreviated and negated? */
	200	if (!rest && !prefixcmp(options->long_name, arg + 3))
	201	goto is_abbreviated;
4a59fd13 PH	202	if (!rest)
	203	continue;
	204	}
	205	if (*rest) {
	206	if (*rest != '=')
	207	continue;
	208	p->opt = rest + 1;
	209	}
	210	return get_value(p, options, flags);
	211	}
243e0614 JS	212
	213	if (ambiguous_option)
	214	return error("Ambiguous option: %s "
	215	"(could be --%s%s or --%s%s)",
	216	arg,
	217	(ambiguous_flags & OPT_UNSET) ? "no-" : "",
	218	ambiguous_option->long_name,
	219	(abbrev_flags & OPT_UNSET) ? "no-" : "",
	220	abbrev_option->long_name);
7f275b91 JS	221	if (abbrev_option)
7f275b91 JS	222	return get_value(p, abbrev_option, abbrev_flags);
07fe54db	223	return -2;
4a59fd13 PH	224	}
4a59fd13 PH	225
1121a878	226	static void check_typos(const char arg, const struct option options)
3a9f0f41 PH	227	{
	228	if (strlen(arg) < 3)
	229	return;
	230
	231	if (!prefixcmp(arg, "no-")) {
	232	error ("did you mean `--%s` (with two dashes ?)", arg);
	233	exit(129);
	234	}
	235
	236	for (; options->type != OPTION_END; options++) {
	237	if (!options->long_name)
	238	continue;
	239	if (!prefixcmp(options->long_name, arg)) {
	240	error ("did you mean `--%s` (with two dashes ?)", arg);
	241	exit(129);
	242	}
	243	}
	244	}
	245
7e7bbcb4 PH	246	void parse_options_start(struct parse_opt_ctx_t *ctx,
	247	int argc, const char **argv, int flags)
	248	{
	249	memset(ctx, 0, sizeof(*ctx));
	250	ctx->argc = argc - 1;
	251	ctx->argv = argv + 1;
	252	ctx->out = argv;
a32a4eaa	253	ctx->cpidx = ((flags & PARSE_OPT_KEEP_ARGV0) != 0);
7e7bbcb4	254	ctx->flags = flags;
0d260f9a RS	255	if ((flags & PARSE_OPT_KEEP_UNKNOWN) &&
	256	(flags & PARSE_OPT_STOP_AT_NON_OPTION))
	257	die("STOP_AT_NON_OPTION and KEEP_UNKNOWN don't go together");
7e7bbcb4 PH	258	}
7e7bbcb4 PH	259
ee68b87a	260	static int usage_with_options_internal(const char * const *,
ff43ec3e	261	const struct option *, int);
dd3bf0f4	262
ff43ec3e PH	263	int parse_options_step(struct parse_opt_ctx_t *ctx,
	264	const struct option *options,
	265	const char * const usagestr[])
4a59fd13	266	{
b92891f9 RS	267	int internal_help = !(ctx->flags & PARSE_OPT_NO_INTERNAL_HELP);
b92891f9 RS	268
26141b5b PH	269	/* we must reset ->opt, unknown short option leave it dangling */
	270	ctx->opt = NULL;
	271
ff43ec3e PH	272	for (; ctx->argc; ctx->argc--, ctx->argv++) {
ff43ec3e PH	273	const char *arg = ctx->argv[0];
4a59fd13 PH	274
4a59fd13 PH	275	if (*arg != '-' \|\| !arg[1]) {
ff43ec3e	276	if (ctx->flags & PARSE_OPT_STOP_AT_NON_OPTION)
a0ec9d25	277	break;
ff43ec3e	278	ctx->out[ctx->cpidx++] = ctx->argv[0];
4a59fd13 PH	279	continue;
	280	}
	281
	282	if (arg[1] != '-') {
ff43ec3e	283	ctx->opt = arg + 1;
b92891f9	284	if (internal_help && *ctx->opt == 'h')
ff43ec3e	285	return parse_options_usage(usagestr, options);
07fe54db PH	286	switch (parse_short_opt(ctx, options)) {
	287	case -1:
	288	return parse_options_usage(usagestr, options);
	289	case -2:
b5ce3a54	290	goto unknown;
07fe54db	291	}
ff43ec3e	292	if (ctx->opt)
3a9f0f41	293	check_typos(arg + 1, options);
ff43ec3e	294	while (ctx->opt) {
b92891f9	295	if (internal_help && *ctx->opt == 'h')
ff43ec3e	296	return parse_options_usage(usagestr, options);
07fe54db PH	297	switch (parse_short_opt(ctx, options)) {
	298	case -1:
	299	return parse_options_usage(usagestr, options);
	300	case -2:
26141b5b PH	301	/* fake a short option thing to hide the fact that we may have
	302	* started to parse aggregated stuff
	303	*
	304	* This is leaky, too bad.
	305	*/
	306	ctx->argv[0] = xstrdup(ctx->opt - 1);
	307	(char )ctx->argv[0] = '-';
b5ce3a54	308	goto unknown;
07fe54db	309	}
3a9f0f41	310	}
4a59fd13 PH	311	continue;
	312	}
	313
	314	if (!arg[2]) { /* "--" */
ff43ec3e PH	315	if (!(ctx->flags & PARSE_OPT_KEEP_DASHDASH)) {
	316	ctx->argc--;
	317	ctx->argv++;
4a59fd13 PH	318	}
	319	break;
	320	}
	321
b92891f9	322	if (internal_help && !strcmp(arg + 2, "help-all"))
ff43ec3e	323	return usage_with_options_internal(usagestr, options, 1);
b92891f9	324	if (internal_help && !strcmp(arg + 2, "help"))
ff43ec3e	325	return parse_options_usage(usagestr, options);
07fe54db PH	326	switch (parse_long_opt(ctx, arg + 2, options)) {
	327	case -1:
	328	return parse_options_usage(usagestr, options);
	329	case -2:
b5ce3a54	330	goto unknown;
07fe54db	331	}
b5ce3a54 RS	332	continue;
	333	unknown:
	334	if (!(ctx->flags & PARSE_OPT_KEEP_UNKNOWN))
	335	return PARSE_OPT_UNKNOWN;
	336	ctx->out[ctx->cpidx++] = ctx->argv[0];
	337	ctx->opt = NULL;
ff43ec3e PH	338	}
	339	return PARSE_OPT_DONE;
	340	}
	341
	342	int parse_options_end(struct parse_opt_ctx_t *ctx)
	343	{
	344	memmove(ctx->out + ctx->cpidx, ctx->argv, ctx->argc * sizeof(*ctx->out));
	345	ctx->out[ctx->cpidx + ctx->argc] = NULL;
	346	return ctx->cpidx + ctx->argc;
	347	}
	348
	349	int parse_options(int argc, const char *argv, const struct option options,
	350	const char * const usagestr[], int flags)
	351	{
	352	struct parse_opt_ctx_t ctx;
	353
	354	parse_options_start(&ctx, argc, argv, flags);
	355	switch (parse_options_step(&ctx, options, usagestr)) {
	356	case PARSE_OPT_HELP:
	357	exit(129);
	358	case PARSE_OPT_DONE:
	359	break;
	360	default: /* PARSE_OPT_UNKNOWN */
07fe54db PH	361	if (ctx.argv[0][1] == '-') {
	362	error("unknown option `%s'", ctx.argv[0] + 2);
	363	} else {
	364	error("unknown switch `%c'", *ctx.opt);
	365	}
	366	usage_with_options(usagestr, options);
4a59fd13 PH	367	}
4a59fd13 PH	368
7e7bbcb4	369	return parse_options_end(&ctx);
4a59fd13	370	}
d7a38c54 PH	371
	372	#define USAGE_OPTS_WIDTH 24
	373	#define USAGE_GAP 2
	374
ee68b87a	375	int usage_with_options_internal(const char * const *usagestr,
ff43ec3e	376	const struct option *opts, int full)
d7a38c54	377	{
49b61802 RS	378	if (!usagestr)
	379	return PARSE_OPT_HELP;
	380
f389c808 AR	381	fprintf(stderr, "usage: %s\n", *usagestr++);
	382	while (usagestr && *usagestr)
	383	fprintf(stderr, " or: %s\n", *usagestr++);
44d86e91 JK	384	while (*usagestr) {
	385	fprintf(stderr, "%s%s\n",
	386	**usagestr ? " " : "",
	387	*usagestr);
	388	usagestr++;
	389	}
d7a38c54 PH	390
d7a38c54 PH	391	if (opts->type != OPTION_GROUP)
f389c808	392	fputc('\n', stderr);
d7a38c54 PH	393
	394	for (; opts->type != OPTION_END; opts++) {
	395	size_t pos;
	396	int pad;
	397
	398	if (opts->type == OPTION_GROUP) {
f389c808	399	fputc('\n', stderr);
d7a38c54	400	if (*opts->help)
f389c808	401	fprintf(stderr, "%s\n", opts->help);
d7a38c54 PH	402	continue;
d7a38c54 PH	403	}
dd3bf0f4 PH	404	if (!full && (opts->flags & PARSE_OPT_HIDDEN))
dd3bf0f4 PH	405	continue;
d7a38c54	406
f389c808	407	pos = fprintf(stderr, " ");
d7a38c54	408	if (opts->short_name)
f389c808	409	pos += fprintf(stderr, "-%c", opts->short_name);
d7a38c54	410	if (opts->long_name && opts->short_name)
f389c808	411	pos += fprintf(stderr, ", ");
d7a38c54	412	if (opts->long_name)
f389c808	413	pos += fprintf(stderr, "--%s", opts->long_name);
d7a38c54 PH	414
d7a38c54 PH	415	switch (opts->type) {
580d5bff PH	416	case OPTION_ARGUMENT:
580d5bff PH	417	break;
d7a38c54	418	case OPTION_INTEGER:
ffe659f9	419	if (opts->flags & PARSE_OPT_OPTARG)
6422f633 MB	420	if (opts->long_name)
	421	pos += fprintf(stderr, "[=<n>]");
	422	else
	423	pos += fprintf(stderr, "[<n>]");
ffe659f9 PH	424	else
ffe659f9 PH	425	pos += fprintf(stderr, " <n>");
d7a38c54	426	break;
ffe659f9	427	case OPTION_CALLBACK:
f481e22a PH	428	if (opts->flags & PARSE_OPT_NOARG)
	429	break;
	430	/* FALLTHROUGH */
	431	case OPTION_STRING:
ffe659f9 PH	432	if (opts->argh) {
ffe659f9 PH	433	if (opts->flags & PARSE_OPT_OPTARG)
6422f633 MB	434	if (opts->long_name)
	435	pos += fprintf(stderr, "[=<%s>]", opts->argh);
	436	else
	437	pos += fprintf(stderr, "[<%s>]", opts->argh);
ffe659f9 PH	438	else
	439	pos += fprintf(stderr, " <%s>", opts->argh);
	440	} else {
	441	if (opts->flags & PARSE_OPT_OPTARG)
6422f633 MB	442	if (opts->long_name)
	443	pos += fprintf(stderr, "[=...]");
	444	else
	445	pos += fprintf(stderr, "[...]");
ffe659f9 PH	446	else
	447	pos += fprintf(stderr, " ...");
	448	}
d7a38c54	449	break;
db7244bd	450	default: /* OPTION_{BIT,BOOLEAN,SET_INT,SET_PTR} */
d7a38c54 PH	451	break;
	452	}
	453
f389c808 AR	454	if (pos <= USAGE_OPTS_WIDTH)
f389c808 AR	455	pad = USAGE_OPTS_WIDTH - pos;
d7a38c54	456	else {
f389c808	457	fputc('\n', stderr);
d7a38c54 PH	458	pad = USAGE_OPTS_WIDTH;
d7a38c54 PH	459	}
f389c808	460	fprintf(stderr, "%*s%s\n", pad + USAGE_GAP, "", opts->help);
d7a38c54	461	}
f389c808 AR	462	fputc('\n', stderr);
f389c808 AR	463
ee68b87a	464	return PARSE_OPT_HELP;
d7a38c54	465	}
0ce865b1	466
dd3bf0f4	467	void usage_with_options(const char * const *usagestr,
ff43ec3e	468	const struct option *opts)
dd3bf0f4	469	{
ff43ec3e PH	470	usage_with_options_internal(usagestr, opts, 0);
ff43ec3e PH	471	exit(129);
dd3bf0f4 PH	472	}
dd3bf0f4 PH	473
ee68b87a PH	474	int parse_options_usage(const char * const *usagestr,
	475	const struct option *opts)
	476	{
ff43ec3e	477	return usage_with_options_internal(usagestr, opts, 0);
ee68b87a PH	478	}
	479
	480
0ce865b1 PH	481	/----- some often used options -----/
0ce865b1 PH	482	#include "cache.h"
db7244bd	483
0ce865b1 PH	484	int parse_opt_abbrev_cb(const struct option opt, const char arg, int unset)
	485	{
	486	int v;
	487
	488	if (!arg) {
	489	v = unset ? 0 : DEFAULT_ABBREV;
	490	} else {
	491	v = strtol(arg, (char **)&arg, 10);
	492	if (*arg)
	493	return opterror(opt, "expects a numerical value", 0);
	494	if (v && v < MINIMUM_ABBREV)
	495	v = MINIMUM_ABBREV;
	496	else if (v > 40)
	497	v = 40;
	498	}
	499	(int )(opt->value) = v;
	500	return 0;
	501	}
1f4a711a MB	502
	503	int parse_opt_approxidate_cb(const struct option opt, const char arg,
	504	int unset)
	505	{
	506	(unsigned long )(opt->value) = approxidate(arg);
	507	return 0;
	508	}
dbd0f5c7	509
7f87aff2 TA	510	int parse_opt_verbosity_cb(const struct option opt, const char arg,
	511	int unset)
	512	{
	513	int *target = opt->value;
	514
	515	if (unset)
	516	/* --no-quiet, --no-verbose */
	517	*target = 0;
	518	else if (opt->short_name == 'v') {
	519	if (*target >= 0)
	520	(*target)++;
	521	else
	522	*target = 1;
	523	} else {
	524	if (*target <= 0)
	525	(*target)--;
	526	else
	527	*target = -1;
	528	}
	529	return 0;
	530	}
	531
269defdf JG	532	int parse_opt_with_commit(const struct option opt, const char arg, int unset)
	533	{
	534	unsigned char sha1[20];
	535	struct commit *commit;
	536
	537	if (!arg)
	538	return -1;
	539	if (get_sha1(arg, sha1))
	540	return error("malformed object name %s", arg);
	541	commit = lookup_commit_reference(sha1);
	542	if (!commit)
	543	return error("no such commit %s", arg);
	544	commit_list_insert(commit, opt->value);
	545	return 0;
	546	}
	547
dbd0f5c7 JH	548	/*
	549	* This should really be OPTION_FILENAME type as a part of
	550	* parse_options that take prefix to do this while parsing.
	551	*/
	552	extern const char parse_options_fix_filename(const char prefix, const char *file)
	553	{
	554	if (!file \|\| !prefix \|\| is_absolute_path(file) \|\| !strcmp("-", file))
	555	return file;
	556	return prefix_filename(prefix, strlen(prefix), file);
	557	}
	558