Documentation/describe: improve one-line summary
[git.git] / parse-options.c
blob80106c06bcc68782baad6afa5954b829ab17ba8d
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 static int parse_options_usage(struct parse_opt_ctx_t *ctx,
9 const char * const *usagestr,
10 const struct option *opts, int err);
12 #define OPT_SHORT 1
13 #define OPT_UNSET 2
15 int optbug(const struct option *opt, const char *reason)
17 if (opt->long_name) {
18 if (opt->short_name)
19 return error("BUG: switch '%c' (--%s) %s",
20 opt->short_name, opt->long_name, reason);
21 return error("BUG: option '%s' %s", opt->long_name, reason);
23 return error("BUG: switch '%c' %s", opt->short_name, reason);
26 static int get_arg(struct parse_opt_ctx_t *p, const struct option *opt,
27 int flags, const char **arg)
29 if (p->opt) {
30 *arg = p->opt;
31 p->opt = NULL;
32 } else if (p->argc == 1 && (opt->flags & PARSE_OPT_LASTARG_DEFAULT)) {
33 *arg = (const char *)opt->defval;
34 } else if (p->argc > 1) {
35 p->argc--;
36 *arg = *++p->argv;
37 } else
38 return opterror(opt, "requires a value", flags);
39 return 0;
42 static void fix_filename(const char *prefix, const char **file)
44 if (!file || !*file || !prefix || is_absolute_path(*file)
45 || !strcmp("-", *file))
46 return;
47 *file = xstrdup(prefix_filename(prefix, strlen(prefix), *file));
50 static int opt_command_mode_error(const struct option *opt,
51 const struct option *all_opts,
52 int flags)
54 const struct option *that;
55 struct strbuf message = STRBUF_INIT;
56 struct strbuf that_name = STRBUF_INIT;
59 * Find the other option that was used to set the variable
60 * already, and report that this is not compatible with it.
62 for (that = all_opts; that->type != OPTION_END; that++) {
63 if (that == opt ||
64 that->type != OPTION_CMDMODE ||
65 that->value != opt->value ||
66 that->defval != *(int *)opt->value)
67 continue;
69 if (that->long_name)
70 strbuf_addf(&that_name, "--%s", that->long_name);
71 else
72 strbuf_addf(&that_name, "-%c", that->short_name);
73 strbuf_addf(&message, ": incompatible with %s", that_name.buf);
74 strbuf_release(&that_name);
75 opterror(opt, message.buf, flags);
76 strbuf_release(&message);
77 return -1;
79 return opterror(opt, ": incompatible with something else", flags);
82 static int get_value(struct parse_opt_ctx_t *p,
83 const struct option *opt,
84 const struct option *all_opts,
85 int flags)
87 const char *s, *arg;
88 const int unset = flags & OPT_UNSET;
89 int err;
91 if (unset && p->opt)
92 return opterror(opt, "takes no value", flags);
93 if (unset && (opt->flags & PARSE_OPT_NONEG))
94 return opterror(opt, "isn't available", flags);
95 if (!(flags & OPT_SHORT) && p->opt && (opt->flags & PARSE_OPT_NOARG))
96 return opterror(opt, "takes no value", flags);
98 switch (opt->type) {
99 case OPTION_LOWLEVEL_CALLBACK:
100 return (*(parse_opt_ll_cb *)opt->callback)(p, opt, unset);
102 case OPTION_BIT:
103 if (unset)
104 *(int *)opt->value &= ~opt->defval;
105 else
106 *(int *)opt->value |= opt->defval;
107 return 0;
109 case OPTION_NEGBIT:
110 if (unset)
111 *(int *)opt->value |= opt->defval;
112 else
113 *(int *)opt->value &= ~opt->defval;
114 return 0;
116 case OPTION_COUNTUP:
117 *(int *)opt->value = unset ? 0 : *(int *)opt->value + 1;
118 return 0;
120 case OPTION_SET_INT:
121 *(int *)opt->value = unset ? 0 : opt->defval;
122 return 0;
124 case OPTION_CMDMODE:
126 * Giving the same mode option twice, although is unnecessary,
127 * is not a grave error, so let it pass.
129 if (*(int *)opt->value && *(int *)opt->value != opt->defval)
130 return opt_command_mode_error(opt, all_opts, flags);
131 *(int *)opt->value = opt->defval;
132 return 0;
134 case OPTION_STRING:
135 if (unset)
136 *(const char **)opt->value = NULL;
137 else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
138 *(const char **)opt->value = (const char *)opt->defval;
139 else
140 return get_arg(p, opt, flags, (const char **)opt->value);
141 return 0;
143 case OPTION_FILENAME:
144 err = 0;
145 if (unset)
146 *(const char **)opt->value = NULL;
147 else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
148 *(const char **)opt->value = (const char *)opt->defval;
149 else
150 err = get_arg(p, opt, flags, (const char **)opt->value);
152 if (!err)
153 fix_filename(p->prefix, (const char **)opt->value);
154 return err;
156 case OPTION_CALLBACK:
157 if (unset)
158 return (*opt->callback)(opt, NULL, 1) ? (-1) : 0;
159 if (opt->flags & PARSE_OPT_NOARG)
160 return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
161 if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
162 return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
163 if (get_arg(p, opt, flags, &arg))
164 return -1;
165 return (*opt->callback)(opt, arg, 0) ? (-1) : 0;
167 case OPTION_INTEGER:
168 if (unset) {
169 *(int *)opt->value = 0;
170 return 0;
172 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
173 *(int *)opt->value = opt->defval;
174 return 0;
176 if (get_arg(p, opt, flags, &arg))
177 return -1;
178 *(int *)opt->value = strtol(arg, (char **)&s, 10);
179 if (*s)
180 return opterror(opt, "expects a numerical value", flags);
181 return 0;
183 default:
184 die("should not happen, someone must be hit on the forehead");
188 static int parse_short_opt(struct parse_opt_ctx_t *p, const struct option *options)
190 const struct option *all_opts = options;
191 const struct option *numopt = NULL;
193 for (; options->type != OPTION_END; options++) {
194 if (options->short_name == *p->opt) {
195 p->opt = p->opt[1] ? p->opt + 1 : NULL;
196 return get_value(p, options, all_opts, OPT_SHORT);
200 * Handle the numerical option later, explicit one-digit
201 * options take precedence over it.
203 if (options->type == OPTION_NUMBER)
204 numopt = options;
206 if (numopt && isdigit(*p->opt)) {
207 size_t len = 1;
208 char *arg;
209 int rc;
211 while (isdigit(p->opt[len]))
212 len++;
213 arg = xmemdupz(p->opt, len);
214 p->opt = p->opt[len] ? p->opt + len : NULL;
215 rc = (*numopt->callback)(numopt, arg, 0) ? (-1) : 0;
216 free(arg);
217 return rc;
219 return -2;
222 static int parse_long_opt(struct parse_opt_ctx_t *p, const char *arg,
223 const struct option *options)
225 const struct option *all_opts = options;
226 const char *arg_end = strchrnul(arg, '=');
227 const struct option *abbrev_option = NULL, *ambiguous_option = NULL;
228 int abbrev_flags = 0, ambiguous_flags = 0;
230 for (; options->type != OPTION_END; options++) {
231 const char *rest, *long_name = options->long_name;
232 int flags = 0, opt_flags = 0;
234 if (!long_name)
235 continue;
237 again:
238 if (!skip_prefix(arg, long_name, &rest))
239 rest = NULL;
240 if (options->type == OPTION_ARGUMENT) {
241 if (!rest)
242 continue;
243 if (*rest == '=')
244 return opterror(options, "takes no value", flags);
245 if (*rest)
246 continue;
247 p->out[p->cpidx++] = arg - 2;
248 return 0;
250 if (!rest) {
251 /* abbreviated? */
252 if (!strncmp(long_name, arg, arg_end - arg)) {
253 is_abbreviated:
254 if (abbrev_option) {
256 * If this is abbreviated, it is
257 * ambiguous. So when there is no
258 * exact match later, we need to
259 * error out.
261 ambiguous_option = abbrev_option;
262 ambiguous_flags = abbrev_flags;
264 if (!(flags & OPT_UNSET) && *arg_end)
265 p->opt = arg_end + 1;
266 abbrev_option = options;
267 abbrev_flags = flags ^ opt_flags;
268 continue;
270 /* negation allowed? */
271 if (options->flags & PARSE_OPT_NONEG)
272 continue;
273 /* negated and abbreviated very much? */
274 if (starts_with("no-", arg)) {
275 flags |= OPT_UNSET;
276 goto is_abbreviated;
278 /* negated? */
279 if (!starts_with(arg, "no-")) {
280 if (starts_with(long_name, "no-")) {
281 long_name += 3;
282 opt_flags |= OPT_UNSET;
283 goto again;
285 continue;
287 flags |= OPT_UNSET;
288 if (!skip_prefix(arg + 3, long_name, &rest)) {
289 /* abbreviated and negated? */
290 if (starts_with(long_name, arg + 3))
291 goto is_abbreviated;
292 else
293 continue;
296 if (*rest) {
297 if (*rest != '=')
298 continue;
299 p->opt = rest + 1;
301 return get_value(p, options, all_opts, flags ^ opt_flags);
304 if (ambiguous_option)
305 return error("Ambiguous option: %s "
306 "(could be --%s%s or --%s%s)",
307 arg,
308 (ambiguous_flags & OPT_UNSET) ? "no-" : "",
309 ambiguous_option->long_name,
310 (abbrev_flags & OPT_UNSET) ? "no-" : "",
311 abbrev_option->long_name);
312 if (abbrev_option)
313 return get_value(p, abbrev_option, all_opts, abbrev_flags);
314 return -2;
317 static int parse_nodash_opt(struct parse_opt_ctx_t *p, const char *arg,
318 const struct option *options)
320 const struct option *all_opts = options;
322 for (; options->type != OPTION_END; options++) {
323 if (!(options->flags & PARSE_OPT_NODASH))
324 continue;
325 if (options->short_name == arg[0] && arg[1] == '\0')
326 return get_value(p, options, all_opts, OPT_SHORT);
328 return -2;
331 static void check_typos(const char *arg, const struct option *options)
333 if (strlen(arg) < 3)
334 return;
336 if (starts_with(arg, "no-")) {
337 error ("did you mean `--%s` (with two dashes ?)", arg);
338 exit(129);
341 for (; options->type != OPTION_END; options++) {
342 if (!options->long_name)
343 continue;
344 if (starts_with(options->long_name, arg)) {
345 error ("did you mean `--%s` (with two dashes ?)", arg);
346 exit(129);
351 static void parse_options_check(const struct option *opts)
353 int err = 0;
354 char short_opts[128];
356 memset(short_opts, '\0', sizeof(short_opts));
357 for (; opts->type != OPTION_END; opts++) {
358 if ((opts->flags & PARSE_OPT_LASTARG_DEFAULT) &&
359 (opts->flags & PARSE_OPT_OPTARG))
360 err |= optbug(opts, "uses incompatible flags "
361 "LASTARG_DEFAULT and OPTARG");
362 if (opts->short_name) {
363 if (0x7F <= opts->short_name)
364 err |= optbug(opts, "invalid short name");
365 else if (short_opts[opts->short_name]++)
366 err |= optbug(opts, "short name already used");
368 if (opts->flags & PARSE_OPT_NODASH &&
369 ((opts->flags & PARSE_OPT_OPTARG) ||
370 !(opts->flags & PARSE_OPT_NOARG) ||
371 !(opts->flags & PARSE_OPT_NONEG) ||
372 opts->long_name))
373 err |= optbug(opts, "uses feature "
374 "not supported for dashless options");
375 switch (opts->type) {
376 case OPTION_COUNTUP:
377 case OPTION_BIT:
378 case OPTION_NEGBIT:
379 case OPTION_SET_INT:
380 case OPTION_NUMBER:
381 if ((opts->flags & PARSE_OPT_OPTARG) ||
382 !(opts->flags & PARSE_OPT_NOARG))
383 err |= optbug(opts, "should not accept an argument");
384 default:
385 ; /* ok. (usually accepts an argument) */
387 if (opts->argh &&
388 strcspn(opts->argh, " _") != strlen(opts->argh))
389 err |= optbug(opts, "multi-word argh should use dash to separate words");
391 if (err)
392 exit(128);
395 void parse_options_start(struct parse_opt_ctx_t *ctx,
396 int argc, const char **argv, const char *prefix,
397 const struct option *options, int flags)
399 memset(ctx, 0, sizeof(*ctx));
400 ctx->argc = argc - 1;
401 ctx->argv = argv + 1;
402 ctx->out = argv;
403 ctx->prefix = prefix;
404 ctx->cpidx = ((flags & PARSE_OPT_KEEP_ARGV0) != 0);
405 ctx->flags = flags;
406 if ((flags & PARSE_OPT_KEEP_UNKNOWN) &&
407 (flags & PARSE_OPT_STOP_AT_NON_OPTION))
408 die("STOP_AT_NON_OPTION and KEEP_UNKNOWN don't go together");
409 parse_options_check(options);
412 static int usage_with_options_internal(struct parse_opt_ctx_t *,
413 const char * const *,
414 const struct option *, int, int);
416 int parse_options_step(struct parse_opt_ctx_t *ctx,
417 const struct option *options,
418 const char * const usagestr[])
420 int internal_help = !(ctx->flags & PARSE_OPT_NO_INTERNAL_HELP);
422 /* we must reset ->opt, unknown short option leave it dangling */
423 ctx->opt = NULL;
425 for (; ctx->argc; ctx->argc--, ctx->argv++) {
426 const char *arg = ctx->argv[0];
428 if (*arg != '-' || !arg[1]) {
429 if (parse_nodash_opt(ctx, arg, options) == 0)
430 continue;
431 if (ctx->flags & PARSE_OPT_STOP_AT_NON_OPTION)
432 return PARSE_OPT_NON_OPTION;
433 ctx->out[ctx->cpidx++] = ctx->argv[0];
434 continue;
437 if (arg[1] != '-') {
438 ctx->opt = arg + 1;
439 if (internal_help && *ctx->opt == 'h')
440 return parse_options_usage(ctx, usagestr, options, 0);
441 switch (parse_short_opt(ctx, options)) {
442 case -1:
443 return parse_options_usage(ctx, usagestr, options, 1);
444 case -2:
445 if (ctx->opt)
446 check_typos(arg + 1, options);
447 goto unknown;
449 if (ctx->opt)
450 check_typos(arg + 1, options);
451 while (ctx->opt) {
452 if (internal_help && *ctx->opt == 'h')
453 return parse_options_usage(ctx, usagestr, options, 0);
454 switch (parse_short_opt(ctx, options)) {
455 case -1:
456 return parse_options_usage(ctx, usagestr, options, 1);
457 case -2:
458 /* fake a short option thing to hide the fact that we may have
459 * started to parse aggregated stuff
461 * This is leaky, too bad.
463 ctx->argv[0] = xstrdup(ctx->opt - 1);
464 *(char *)ctx->argv[0] = '-';
465 goto unknown;
468 continue;
471 if (!arg[2]) { /* "--" */
472 if (!(ctx->flags & PARSE_OPT_KEEP_DASHDASH)) {
473 ctx->argc--;
474 ctx->argv++;
476 break;
479 if (internal_help && !strcmp(arg + 2, "help-all"))
480 return usage_with_options_internal(ctx, usagestr, options, 1, 0);
481 if (internal_help && !strcmp(arg + 2, "help"))
482 return parse_options_usage(ctx, usagestr, options, 0);
483 switch (parse_long_opt(ctx, arg + 2, options)) {
484 case -1:
485 return parse_options_usage(ctx, usagestr, options, 1);
486 case -2:
487 goto unknown;
489 continue;
490 unknown:
491 if (!(ctx->flags & PARSE_OPT_KEEP_UNKNOWN))
492 return PARSE_OPT_UNKNOWN;
493 ctx->out[ctx->cpidx++] = ctx->argv[0];
494 ctx->opt = NULL;
496 return PARSE_OPT_DONE;
499 int parse_options_end(struct parse_opt_ctx_t *ctx)
501 memmove(ctx->out + ctx->cpidx, ctx->argv, ctx->argc * sizeof(*ctx->out));
502 ctx->out[ctx->cpidx + ctx->argc] = NULL;
503 return ctx->cpidx + ctx->argc;
506 int parse_options(int argc, const char **argv, const char *prefix,
507 const struct option *options, const char * const usagestr[],
508 int flags)
510 struct parse_opt_ctx_t ctx;
512 parse_options_start(&ctx, argc, argv, prefix, options, flags);
513 switch (parse_options_step(&ctx, options, usagestr)) {
514 case PARSE_OPT_HELP:
515 exit(129);
516 case PARSE_OPT_NON_OPTION:
517 case PARSE_OPT_DONE:
518 break;
519 default: /* PARSE_OPT_UNKNOWN */
520 if (ctx.argv[0][1] == '-') {
521 error("unknown option `%s'", ctx.argv[0] + 2);
522 } else if (isascii(*ctx.opt)) {
523 error("unknown switch `%c'", *ctx.opt);
524 } else {
525 error("unknown non-ascii option in string: `%s'",
526 ctx.argv[0]);
528 usage_with_options(usagestr, options);
531 precompose_argv(argc, argv);
532 return parse_options_end(&ctx);
535 static int usage_argh(const struct option *opts, FILE *outfile)
537 const char *s;
538 int literal = (opts->flags & PARSE_OPT_LITERAL_ARGHELP) || !opts->argh;
539 if (opts->flags & PARSE_OPT_OPTARG)
540 if (opts->long_name)
541 s = literal ? "[=%s]" : "[=<%s>]";
542 else
543 s = literal ? "[%s]" : "[<%s>]";
544 else
545 s = literal ? " %s" : " <%s>";
546 return utf8_fprintf(outfile, s, opts->argh ? _(opts->argh) : _("..."));
549 #define USAGE_OPTS_WIDTH 24
550 #define USAGE_GAP 2
552 static int usage_with_options_internal(struct parse_opt_ctx_t *ctx,
553 const char * const *usagestr,
554 const struct option *opts, int full, int err)
556 FILE *outfile = err ? stderr : stdout;
558 if (!usagestr)
559 return PARSE_OPT_HELP;
561 if (!err && ctx && ctx->flags & PARSE_OPT_SHELL_EVAL)
562 fprintf(outfile, "cat <<\\EOF\n");
564 fprintf_ln(outfile, _("usage: %s"), _(*usagestr++));
565 while (*usagestr && **usagestr)
566 /* TRANSLATORS: the colon here should align with the
567 one in "usage: %s" translation */
568 fprintf_ln(outfile, _(" or: %s"), _(*usagestr++));
569 while (*usagestr) {
570 if (**usagestr)
571 fprintf_ln(outfile, _(" %s"), _(*usagestr));
572 else
573 putchar('\n');
574 usagestr++;
577 if (opts->type != OPTION_GROUP)
578 fputc('\n', outfile);
580 for (; opts->type != OPTION_END; opts++) {
581 size_t pos;
582 int pad;
584 if (opts->type == OPTION_GROUP) {
585 fputc('\n', outfile);
586 if (*opts->help)
587 fprintf(outfile, "%s\n", _(opts->help));
588 continue;
590 if (!full && (opts->flags & PARSE_OPT_HIDDEN))
591 continue;
593 pos = fprintf(outfile, " ");
594 if (opts->short_name) {
595 if (opts->flags & PARSE_OPT_NODASH)
596 pos += fprintf(outfile, "%c", opts->short_name);
597 else
598 pos += fprintf(outfile, "-%c", opts->short_name);
600 if (opts->long_name && opts->short_name)
601 pos += fprintf(outfile, ", ");
602 if (opts->long_name)
603 pos += fprintf(outfile, "--%s", opts->long_name);
604 if (opts->type == OPTION_NUMBER)
605 pos += utf8_fprintf(outfile, _("-NUM"));
607 if ((opts->flags & PARSE_OPT_LITERAL_ARGHELP) ||
608 !(opts->flags & PARSE_OPT_NOARG))
609 pos += usage_argh(opts, outfile);
611 if (pos <= USAGE_OPTS_WIDTH)
612 pad = USAGE_OPTS_WIDTH - pos;
613 else {
614 fputc('\n', outfile);
615 pad = USAGE_OPTS_WIDTH;
617 fprintf(outfile, "%*s%s\n", pad + USAGE_GAP, "", _(opts->help));
619 fputc('\n', outfile);
621 if (!err && ctx && ctx->flags & PARSE_OPT_SHELL_EVAL)
622 fputs("EOF\n", outfile);
624 return PARSE_OPT_HELP;
627 void NORETURN usage_with_options(const char * const *usagestr,
628 const struct option *opts)
630 usage_with_options_internal(NULL, usagestr, opts, 0, 1);
631 exit(129);
634 void NORETURN usage_msg_opt(const char *msg,
635 const char * const *usagestr,
636 const struct option *options)
638 fprintf(stderr, "%s\n\n", msg);
639 usage_with_options(usagestr, options);
642 static int parse_options_usage(struct parse_opt_ctx_t *ctx,
643 const char * const *usagestr,
644 const struct option *opts, int err)
646 return usage_with_options_internal(ctx, usagestr, opts, 0, err);
649 #undef opterror
650 int opterror(const struct option *opt, const char *reason, int flags)
652 if (flags & OPT_SHORT)
653 return error("switch `%c' %s", opt->short_name, reason);
654 if (flags & OPT_UNSET)
655 return error("option `no-%s' %s", opt->long_name, reason);
656 return error("option `%s' %s", opt->long_name, reason);