Documentation/stash: remove mention of git reset --hard
[git.git] / parse-options.c
blob4fbe924a5de27d04b271a11a2ae040e817483951
1 #include "git-compat-util.h"
2 #include "parse-options.h"
3 #include "cache.h"
4 #include "commit.h"
5 #include "color.h"
6 #include "utf8.h"
8 #define OPT_SHORT 1
9 #define OPT_UNSET 2
11 int optbug(const struct option *opt, const char *reason)
13 if (opt->long_name) {
14 if (opt->short_name)
15 return error("BUG: switch '%c' (--%s) %s",
16 opt->short_name, opt->long_name, reason);
17 return error("BUG: option '%s' %s", opt->long_name, reason);
19 return error("BUG: switch '%c' %s", opt->short_name, reason);
22 static int get_arg(struct parse_opt_ctx_t *p, const struct option *opt,
23 int flags, const char **arg)
25 if (p->opt) {
26 *arg = p->opt;
27 p->opt = NULL;
28 } else if (p->argc == 1 && (opt->flags & PARSE_OPT_LASTARG_DEFAULT)) {
29 *arg = (const char *)opt->defval;
30 } else if (p->argc > 1) {
31 p->argc--;
32 *arg = *++p->argv;
33 } else
34 return opterror(opt, "requires a value", flags);
35 return 0;
38 static void fix_filename(const char *prefix, const char **file)
40 if (!file || !*file || !prefix || is_absolute_path(*file)
41 || !strcmp("-", *file))
42 return;
43 *file = xstrdup(prefix_filename(prefix, strlen(prefix), *file));
46 static int opt_command_mode_error(const struct option *opt,
47 const struct option *all_opts,
48 int flags)
50 const struct option *that;
51 struct strbuf message = STRBUF_INIT;
52 struct strbuf that_name = STRBUF_INIT;
55 * Find the other option that was used to set the variable
56 * already, and report that this is not compatible with it.
58 for (that = all_opts; that->type != OPTION_END; that++) {
59 if (that == opt ||
60 that->type != OPTION_CMDMODE ||
61 that->value != opt->value ||
62 that->defval != *(int *)opt->value)
63 continue;
65 if (that->long_name)
66 strbuf_addf(&that_name, "--%s", that->long_name);
67 else
68 strbuf_addf(&that_name, "-%c", that->short_name);
69 strbuf_addf(&message, ": incompatible with %s", that_name.buf);
70 strbuf_release(&that_name);
71 opterror(opt, message.buf, flags);
72 strbuf_release(&message);
73 return -1;
75 return opterror(opt, ": incompatible with something else", flags);
78 static int get_value(struct parse_opt_ctx_t *p,
79 const struct option *opt,
80 const struct option *all_opts,
81 int flags)
83 const char *s, *arg;
84 const int unset = flags & OPT_UNSET;
85 int err;
87 if (unset && p->opt)
88 return opterror(opt, "takes no value", flags);
89 if (unset && (opt->flags & PARSE_OPT_NONEG))
90 return opterror(opt, "isn't available", flags);
91 if (!(flags & OPT_SHORT) && p->opt && (opt->flags & PARSE_OPT_NOARG))
92 return opterror(opt, "takes no value", flags);
94 switch (opt->type) {
95 case OPTION_LOWLEVEL_CALLBACK:
96 return (*(parse_opt_ll_cb *)opt->callback)(p, opt, unset);
98 case OPTION_BIT:
99 if (unset)
100 *(int *)opt->value &= ~opt->defval;
101 else
102 *(int *)opt->value |= opt->defval;
103 return 0;
105 case OPTION_NEGBIT:
106 if (unset)
107 *(int *)opt->value |= opt->defval;
108 else
109 *(int *)opt->value &= ~opt->defval;
110 return 0;
112 case OPTION_COUNTUP:
113 if (*(int *)opt->value < 0)
114 *(int *)opt->value = 0;
115 *(int *)opt->value = unset ? 0 : *(int *)opt->value + 1;
116 return 0;
118 case OPTION_SET_INT:
119 *(int *)opt->value = unset ? 0 : opt->defval;
120 return 0;
122 case OPTION_CMDMODE:
124 * Giving the same mode option twice, although is unnecessary,
125 * is not a grave error, so let it pass.
127 if (*(int *)opt->value && *(int *)opt->value != opt->defval)
128 return opt_command_mode_error(opt, all_opts, flags);
129 *(int *)opt->value = opt->defval;
130 return 0;
132 case OPTION_STRING:
133 if (unset)
134 *(const char **)opt->value = NULL;
135 else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
136 *(const char **)opt->value = (const char *)opt->defval;
137 else
138 return get_arg(p, opt, flags, (const char **)opt->value);
139 return 0;
141 case OPTION_FILENAME:
142 err = 0;
143 if (unset)
144 *(const char **)opt->value = NULL;
145 else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
146 *(const char **)opt->value = (const char *)opt->defval;
147 else
148 err = get_arg(p, opt, flags, (const char **)opt->value);
150 if (!err)
151 fix_filename(p->prefix, (const char **)opt->value);
152 return err;
154 case OPTION_CALLBACK:
155 if (unset)
156 return (*opt->callback)(opt, NULL, 1) ? (-1) : 0;
157 if (opt->flags & PARSE_OPT_NOARG)
158 return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
159 if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
160 return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
161 if (get_arg(p, opt, flags, &arg))
162 return -1;
163 return (*opt->callback)(opt, arg, 0) ? (-1) : 0;
165 case OPTION_INTEGER:
166 if (unset) {
167 *(int *)opt->value = 0;
168 return 0;
170 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
171 *(int *)opt->value = opt->defval;
172 return 0;
174 if (get_arg(p, opt, flags, &arg))
175 return -1;
176 *(int *)opt->value = strtol(arg, (char **)&s, 10);
177 if (*s)
178 return opterror(opt, "expects a numerical value", flags);
179 return 0;
181 case OPTION_MAGNITUDE:
182 if (unset) {
183 *(unsigned long *)opt->value = 0;
184 return 0;
186 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
187 *(unsigned long *)opt->value = opt->defval;
188 return 0;
190 if (get_arg(p, opt, flags, &arg))
191 return -1;
192 if (!git_parse_ulong(arg, opt->value))
193 return opterror(opt,
194 "expects a non-negative integer value with an optional k/m/g suffix",
195 flags);
196 return 0;
198 default:
199 die("should not happen, someone must be hit on the forehead");
203 static int parse_short_opt(struct parse_opt_ctx_t *p, const struct option *options)
205 const struct option *all_opts = options;
206 const struct option *numopt = NULL;
208 for (; options->type != OPTION_END; options++) {
209 if (options->short_name == *p->opt) {
210 p->opt = p->opt[1] ? p->opt + 1 : NULL;
211 return get_value(p, options, all_opts, OPT_SHORT);
215 * Handle the numerical option later, explicit one-digit
216 * options take precedence over it.
218 if (options->type == OPTION_NUMBER)
219 numopt = options;
221 if (numopt && isdigit(*p->opt)) {
222 size_t len = 1;
223 char *arg;
224 int rc;
226 while (isdigit(p->opt[len]))
227 len++;
228 arg = xmemdupz(p->opt, len);
229 p->opt = p->opt[len] ? p->opt + len : NULL;
230 rc = (*numopt->callback)(numopt, arg, 0) ? (-1) : 0;
231 free(arg);
232 return rc;
234 return -2;
237 static int parse_long_opt(struct parse_opt_ctx_t *p, const char *arg,
238 const struct option *options)
240 const struct option *all_opts = options;
241 const char *arg_end = strchrnul(arg, '=');
242 const struct option *abbrev_option = NULL, *ambiguous_option = NULL;
243 int abbrev_flags = 0, ambiguous_flags = 0;
245 for (; options->type != OPTION_END; options++) {
246 const char *rest, *long_name = options->long_name;
247 int flags = 0, opt_flags = 0;
249 if (!long_name)
250 continue;
252 again:
253 if (!skip_prefix(arg, long_name, &rest))
254 rest = NULL;
255 if (options->type == OPTION_ARGUMENT) {
256 if (!rest)
257 continue;
258 if (*rest == '=')
259 return opterror(options, "takes no value", flags);
260 if (*rest)
261 continue;
262 p->out[p->cpidx++] = arg - 2;
263 return 0;
265 if (!rest) {
266 /* abbreviated? */
267 if (!strncmp(long_name, arg, arg_end - arg)) {
268 is_abbreviated:
269 if (abbrev_option) {
271 * If this is abbreviated, it is
272 * ambiguous. So when there is no
273 * exact match later, we need to
274 * error out.
276 ambiguous_option = abbrev_option;
277 ambiguous_flags = abbrev_flags;
279 if (!(flags & OPT_UNSET) && *arg_end)
280 p->opt = arg_end + 1;
281 abbrev_option = options;
282 abbrev_flags = flags ^ opt_flags;
283 continue;
285 /* negation allowed? */
286 if (options->flags & PARSE_OPT_NONEG)
287 continue;
288 /* negated and abbreviated very much? */
289 if (starts_with("no-", arg)) {
290 flags |= OPT_UNSET;
291 goto is_abbreviated;
293 /* negated? */
294 if (!starts_with(arg, "no-")) {
295 if (starts_with(long_name, "no-")) {
296 long_name += 3;
297 opt_flags |= OPT_UNSET;
298 goto again;
300 continue;
302 flags |= OPT_UNSET;
303 if (!skip_prefix(arg + 3, long_name, &rest)) {
304 /* abbreviated and negated? */
305 if (starts_with(long_name, arg + 3))
306 goto is_abbreviated;
307 else
308 continue;
311 if (*rest) {
312 if (*rest != '=')
313 continue;
314 p->opt = rest + 1;
316 return get_value(p, options, all_opts, flags ^ opt_flags);
319 if (ambiguous_option)
320 return error("Ambiguous option: %s "
321 "(could be --%s%s or --%s%s)",
322 arg,
323 (ambiguous_flags & OPT_UNSET) ? "no-" : "",
324 ambiguous_option->long_name,
325 (abbrev_flags & OPT_UNSET) ? "no-" : "",
326 abbrev_option->long_name);
327 if (abbrev_option)
328 return get_value(p, abbrev_option, all_opts, abbrev_flags);
329 return -2;
332 static int parse_nodash_opt(struct parse_opt_ctx_t *p, const char *arg,
333 const struct option *options)
335 const struct option *all_opts = options;
337 for (; options->type != OPTION_END; options++) {
338 if (!(options->flags & PARSE_OPT_NODASH))
339 continue;
340 if (options->short_name == arg[0] && arg[1] == '\0')
341 return get_value(p, options, all_opts, OPT_SHORT);
343 return -2;
346 static void check_typos(const char *arg, const struct option *options)
348 if (strlen(arg) < 3)
349 return;
351 if (starts_with(arg, "no-")) {
352 error ("did you mean `--%s` (with two dashes ?)", arg);
353 exit(129);
356 for (; options->type != OPTION_END; options++) {
357 if (!options->long_name)
358 continue;
359 if (starts_with(options->long_name, arg)) {
360 error ("did you mean `--%s` (with two dashes ?)", arg);
361 exit(129);
366 static void parse_options_check(const struct option *opts)
368 int err = 0;
369 char short_opts[128];
371 memset(short_opts, '\0', sizeof(short_opts));
372 for (; opts->type != OPTION_END; opts++) {
373 if ((opts->flags & PARSE_OPT_LASTARG_DEFAULT) &&
374 (opts->flags & PARSE_OPT_OPTARG))
375 err |= optbug(opts, "uses incompatible flags "
376 "LASTARG_DEFAULT and OPTARG");
377 if (opts->short_name) {
378 if (0x7F <= opts->short_name)
379 err |= optbug(opts, "invalid short name");
380 else if (short_opts[opts->short_name]++)
381 err |= optbug(opts, "short name already used");
383 if (opts->flags & PARSE_OPT_NODASH &&
384 ((opts->flags & PARSE_OPT_OPTARG) ||
385 !(opts->flags & PARSE_OPT_NOARG) ||
386 !(opts->flags & PARSE_OPT_NONEG) ||
387 opts->long_name))
388 err |= optbug(opts, "uses feature "
389 "not supported for dashless options");
390 switch (opts->type) {
391 case OPTION_COUNTUP:
392 case OPTION_BIT:
393 case OPTION_NEGBIT:
394 case OPTION_SET_INT:
395 case OPTION_NUMBER:
396 if ((opts->flags & PARSE_OPT_OPTARG) ||
397 !(opts->flags & PARSE_OPT_NOARG))
398 err |= optbug(opts, "should not accept an argument");
399 default:
400 ; /* ok. (usually accepts an argument) */
402 if (opts->argh &&
403 strcspn(opts->argh, " _") != strlen(opts->argh))
404 err |= optbug(opts, "multi-word argh should use dash to separate words");
406 if (err)
407 exit(128);
410 void parse_options_start(struct parse_opt_ctx_t *ctx,
411 int argc, const char **argv, const char *prefix,
412 const struct option *options, int flags)
414 memset(ctx, 0, sizeof(*ctx));
415 ctx->argc = ctx->total = argc - 1;
416 ctx->argv = argv + 1;
417 ctx->out = argv;
418 ctx->prefix = prefix;
419 ctx->cpidx = ((flags & PARSE_OPT_KEEP_ARGV0) != 0);
420 ctx->flags = flags;
421 if ((flags & PARSE_OPT_KEEP_UNKNOWN) &&
422 (flags & PARSE_OPT_STOP_AT_NON_OPTION))
423 die("STOP_AT_NON_OPTION and KEEP_UNKNOWN don't go together");
424 parse_options_check(options);
427 static int usage_with_options_internal(struct parse_opt_ctx_t *,
428 const char * const *,
429 const struct option *, int, int);
431 int parse_options_step(struct parse_opt_ctx_t *ctx,
432 const struct option *options,
433 const char * const usagestr[])
435 int internal_help = !(ctx->flags & PARSE_OPT_NO_INTERNAL_HELP);
436 int err = 0;
438 /* we must reset ->opt, unknown short option leave it dangling */
439 ctx->opt = NULL;
441 for (; ctx->argc; ctx->argc--, ctx->argv++) {
442 const char *arg = ctx->argv[0];
444 if (*arg != '-' || !arg[1]) {
445 if (parse_nodash_opt(ctx, arg, options) == 0)
446 continue;
447 if (ctx->flags & PARSE_OPT_STOP_AT_NON_OPTION)
448 return PARSE_OPT_NON_OPTION;
449 ctx->out[ctx->cpidx++] = ctx->argv[0];
450 continue;
453 /* lone -h asks for help */
454 if (internal_help && ctx->total == 1 && !strcmp(arg + 1, "h"))
455 goto show_usage;
457 if (arg[1] != '-') {
458 ctx->opt = arg + 1;
459 switch (parse_short_opt(ctx, options)) {
460 case -1:
461 goto show_usage_error;
462 case -2:
463 if (ctx->opt)
464 check_typos(arg + 1, options);
465 if (internal_help && *ctx->opt == 'h')
466 goto show_usage;
467 goto unknown;
469 if (ctx->opt)
470 check_typos(arg + 1, options);
471 while (ctx->opt) {
472 switch (parse_short_opt(ctx, options)) {
473 case -1:
474 goto show_usage_error;
475 case -2:
476 if (internal_help && *ctx->opt == 'h')
477 goto show_usage;
479 /* fake a short option thing to hide the fact that we may have
480 * started to parse aggregated stuff
482 * This is leaky, too bad.
484 ctx->argv[0] = xstrdup(ctx->opt - 1);
485 *(char *)ctx->argv[0] = '-';
486 goto unknown;
489 continue;
492 if (!arg[2]) { /* "--" */
493 if (!(ctx->flags & PARSE_OPT_KEEP_DASHDASH)) {
494 ctx->argc--;
495 ctx->argv++;
497 break;
500 if (internal_help && !strcmp(arg + 2, "help-all"))
501 return usage_with_options_internal(ctx, usagestr, options, 1, 0);
502 if (internal_help && !strcmp(arg + 2, "help"))
503 goto show_usage;
504 switch (parse_long_opt(ctx, arg + 2, options)) {
505 case -1:
506 goto show_usage_error;
507 case -2:
508 goto unknown;
510 continue;
511 unknown:
512 if (!(ctx->flags & PARSE_OPT_KEEP_UNKNOWN))
513 return PARSE_OPT_UNKNOWN;
514 ctx->out[ctx->cpidx++] = ctx->argv[0];
515 ctx->opt = NULL;
517 return PARSE_OPT_DONE;
519 show_usage_error:
520 err = 1;
521 show_usage:
522 return usage_with_options_internal(ctx, usagestr, options, 0, err);
525 int parse_options_end(struct parse_opt_ctx_t *ctx)
527 memmove(ctx->out + ctx->cpidx, ctx->argv, ctx->argc * sizeof(*ctx->out));
528 ctx->out[ctx->cpidx + ctx->argc] = NULL;
529 return ctx->cpidx + ctx->argc;
532 int parse_options(int argc, const char **argv, const char *prefix,
533 const struct option *options, const char * const usagestr[],
534 int flags)
536 struct parse_opt_ctx_t ctx;
538 parse_options_start(&ctx, argc, argv, prefix, options, flags);
539 switch (parse_options_step(&ctx, options, usagestr)) {
540 case PARSE_OPT_HELP:
541 exit(129);
542 case PARSE_OPT_NON_OPTION:
543 case PARSE_OPT_DONE:
544 break;
545 default: /* PARSE_OPT_UNKNOWN */
546 if (ctx.argv[0][1] == '-') {
547 error("unknown option `%s'", ctx.argv[0] + 2);
548 } else if (isascii(*ctx.opt)) {
549 error("unknown switch `%c'", *ctx.opt);
550 } else {
551 error("unknown non-ascii option in string: `%s'",
552 ctx.argv[0]);
554 usage_with_options(usagestr, options);
557 precompose_argv(argc, argv);
558 return parse_options_end(&ctx);
561 static int usage_argh(const struct option *opts, FILE *outfile)
563 const char *s;
564 int literal = (opts->flags & PARSE_OPT_LITERAL_ARGHELP) || !opts->argh;
565 if (opts->flags & PARSE_OPT_OPTARG)
566 if (opts->long_name)
567 s = literal ? "[=%s]" : "[=<%s>]";
568 else
569 s = literal ? "[%s]" : "[<%s>]";
570 else
571 s = literal ? " %s" : " <%s>";
572 return utf8_fprintf(outfile, s, opts->argh ? _(opts->argh) : _("..."));
575 #define USAGE_OPTS_WIDTH 24
576 #define USAGE_GAP 2
578 static int usage_with_options_internal(struct parse_opt_ctx_t *ctx,
579 const char * const *usagestr,
580 const struct option *opts, int full, int err)
582 FILE *outfile = err ? stderr : stdout;
584 if (!usagestr)
585 return PARSE_OPT_HELP;
587 if (!err && ctx && ctx->flags & PARSE_OPT_SHELL_EVAL)
588 fprintf(outfile, "cat <<\\EOF\n");
590 fprintf_ln(outfile, _("usage: %s"), _(*usagestr++));
591 while (*usagestr && **usagestr)
592 /* TRANSLATORS: the colon here should align with the
593 one in "usage: %s" translation */
594 fprintf_ln(outfile, _(" or: %s"), _(*usagestr++));
595 while (*usagestr) {
596 if (**usagestr)
597 fprintf_ln(outfile, _(" %s"), _(*usagestr));
598 else
599 putchar('\n');
600 usagestr++;
603 if (opts->type != OPTION_GROUP)
604 fputc('\n', outfile);
606 for (; opts->type != OPTION_END; opts++) {
607 size_t pos;
608 int pad;
610 if (opts->type == OPTION_GROUP) {
611 fputc('\n', outfile);
612 if (*opts->help)
613 fprintf(outfile, "%s\n", _(opts->help));
614 continue;
616 if (!full && (opts->flags & PARSE_OPT_HIDDEN))
617 continue;
619 pos = fprintf(outfile, " ");
620 if (opts->short_name) {
621 if (opts->flags & PARSE_OPT_NODASH)
622 pos += fprintf(outfile, "%c", opts->short_name);
623 else
624 pos += fprintf(outfile, "-%c", opts->short_name);
626 if (opts->long_name && opts->short_name)
627 pos += fprintf(outfile, ", ");
628 if (opts->long_name)
629 pos += fprintf(outfile, "--%s", opts->long_name);
630 if (opts->type == OPTION_NUMBER)
631 pos += utf8_fprintf(outfile, _("-NUM"));
633 if ((opts->flags & PARSE_OPT_LITERAL_ARGHELP) ||
634 !(opts->flags & PARSE_OPT_NOARG))
635 pos += usage_argh(opts, outfile);
637 if (pos <= USAGE_OPTS_WIDTH)
638 pad = USAGE_OPTS_WIDTH - pos;
639 else {
640 fputc('\n', outfile);
641 pad = USAGE_OPTS_WIDTH;
643 fprintf(outfile, "%*s%s\n", pad + USAGE_GAP, "", _(opts->help));
645 fputc('\n', outfile);
647 if (!err && ctx && ctx->flags & PARSE_OPT_SHELL_EVAL)
648 fputs("EOF\n", outfile);
650 return PARSE_OPT_HELP;
653 void NORETURN usage_with_options(const char * const *usagestr,
654 const struct option *opts)
656 usage_with_options_internal(NULL, usagestr, opts, 0, 1);
657 exit(129);
660 void NORETURN usage_msg_opt(const char *msg,
661 const char * const *usagestr,
662 const struct option *options)
664 fprintf(stderr, "fatal: %s\n\n", msg);
665 usage_with_options(usagestr, options);
668 #undef opterror
669 int opterror(const struct option *opt, const char *reason, int flags)
671 if (flags & OPT_SHORT)
672 return error("switch `%c' %s", opt->short_name, reason);
673 if (flags & OPT_UNSET)
674 return error("option `no-%s' %s", opt->long_name, reason);
675 return error("option `%s' %s", opt->long_name, reason);