send-email: accept absolute path even on Windows
[git/dscho.git] / parse-options.c
blobf0098eb8ea7eed27d8a67952481f043ce7c75d4a
1 #include "git-compat-util.h"
2 #include "parse-options.h"
3 #include "cache.h"
4 #include "commit.h"
5 #include "color.h"
7 static int parse_options_usage(struct parse_opt_ctx_t *ctx,
8 const char * const *usagestr,
9 const struct option *opts, int err);
11 #define OPT_SHORT 1
12 #define OPT_UNSET 2
14 int optbug(const struct option *opt, const char *reason)
16 if (opt->long_name)
17 return error("BUG: option '%s' %s", opt->long_name, reason);
18 return error("BUG: switch '%c' %s", opt->short_name, reason);
21 int opterror(const struct option *opt, const char *reason, int flags)
23 if (flags & OPT_SHORT)
24 return error("switch `%c' %s", opt->short_name, reason);
25 if (flags & OPT_UNSET)
26 return error("option `no-%s' %s", opt->long_name, reason);
27 return error("option `%s' %s", opt->long_name, reason);
30 static int get_arg(struct parse_opt_ctx_t *p, const struct option *opt,
31 int flags, const char **arg)
33 if (p->opt) {
34 *arg = p->opt;
35 p->opt = NULL;
36 } else if (p->argc == 1 && (opt->flags & PARSE_OPT_LASTARG_DEFAULT)) {
37 *arg = (const char *)opt->defval;
38 } else if (p->argc > 1) {
39 p->argc--;
40 *arg = *++p->argv;
41 } else
42 return opterror(opt, "requires a value", flags);
43 return 0;
46 static void fix_filename(const char *prefix, const char **file)
48 if (!file || !*file || !prefix || is_absolute_path(*file)
49 || !strcmp("-", *file))
50 return;
51 *file = xstrdup(prefix_filename(prefix, strlen(prefix), *file));
54 static int get_value(struct parse_opt_ctx_t *p,
55 const struct option *opt, int flags)
57 const char *s, *arg;
58 const int unset = flags & OPT_UNSET;
59 int err;
61 if (unset && p->opt)
62 return opterror(opt, "takes no value", flags);
63 if (unset && (opt->flags & PARSE_OPT_NONEG))
64 return opterror(opt, "isn't available", flags);
65 if (!(flags & OPT_SHORT) && p->opt && (opt->flags & PARSE_OPT_NOARG))
66 return opterror(opt, "takes no value", flags);
68 switch (opt->type) {
69 case OPTION_LOWLEVEL_CALLBACK:
70 return (*(parse_opt_ll_cb *)opt->callback)(p, opt, unset);
72 case OPTION_BIT:
73 if (unset)
74 *(int *)opt->value &= ~opt->defval;
75 else
76 *(int *)opt->value |= opt->defval;
77 return 0;
79 case OPTION_NEGBIT:
80 if (unset)
81 *(int *)opt->value |= opt->defval;
82 else
83 *(int *)opt->value &= ~opt->defval;
84 return 0;
86 case OPTION_COUNTUP:
87 *(int *)opt->value = unset ? 0 : *(int *)opt->value + 1;
88 return 0;
90 case OPTION_SET_INT:
91 *(int *)opt->value = unset ? 0 : opt->defval;
92 return 0;
94 case OPTION_SET_PTR:
95 *(void **)opt->value = unset ? NULL : (void *)opt->defval;
96 return 0;
98 case OPTION_STRING:
99 if (unset)
100 *(const char **)opt->value = NULL;
101 else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
102 *(const char **)opt->value = (const char *)opt->defval;
103 else
104 return get_arg(p, opt, flags, (const char **)opt->value);
105 return 0;
107 case OPTION_FILENAME:
108 err = 0;
109 if (unset)
110 *(const char **)opt->value = NULL;
111 else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
112 *(const char **)opt->value = (const char *)opt->defval;
113 else
114 err = get_arg(p, opt, flags, (const char **)opt->value);
116 if (!err)
117 fix_filename(p->prefix, (const char **)opt->value);
118 return err;
120 case OPTION_CALLBACK:
121 if (unset)
122 return (*opt->callback)(opt, NULL, 1) ? (-1) : 0;
123 if (opt->flags & PARSE_OPT_NOARG)
124 return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
125 if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
126 return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
127 if (get_arg(p, opt, flags, &arg))
128 return -1;
129 return (*opt->callback)(opt, arg, 0) ? (-1) : 0;
131 case OPTION_INTEGER:
132 if (unset) {
133 *(int *)opt->value = 0;
134 return 0;
136 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
137 *(int *)opt->value = opt->defval;
138 return 0;
140 if (get_arg(p, opt, flags, &arg))
141 return -1;
142 *(int *)opt->value = strtol(arg, (char **)&s, 10);
143 if (*s)
144 return opterror(opt, "expects a numerical value", flags);
145 return 0;
147 default:
148 die("should not happen, someone must be hit on the forehead");
152 static int parse_short_opt(struct parse_opt_ctx_t *p, const struct option *options)
154 const struct option *numopt = NULL;
156 for (; options->type != OPTION_END; options++) {
157 if (options->short_name == *p->opt) {
158 p->opt = p->opt[1] ? p->opt + 1 : NULL;
159 return get_value(p, options, OPT_SHORT);
163 * Handle the numerical option later, explicit one-digit
164 * options take precedence over it.
166 if (options->type == OPTION_NUMBER)
167 numopt = options;
169 if (numopt && isdigit(*p->opt)) {
170 size_t len = 1;
171 char *arg;
172 int rc;
174 while (isdigit(p->opt[len]))
175 len++;
176 arg = xmemdupz(p->opt, len);
177 p->opt = p->opt[len] ? p->opt + len : NULL;
178 rc = (*numopt->callback)(numopt, arg, 0) ? (-1) : 0;
179 free(arg);
180 return rc;
182 return -2;
185 static int parse_long_opt(struct parse_opt_ctx_t *p, const char *arg,
186 const struct option *options)
188 const char *arg_end = strchr(arg, '=');
189 const struct option *abbrev_option = NULL, *ambiguous_option = NULL;
190 int abbrev_flags = 0, ambiguous_flags = 0;
192 if (!arg_end)
193 arg_end = arg + strlen(arg);
195 for (; options->type != OPTION_END; options++) {
196 const char *rest;
197 int flags = 0;
199 if (!options->long_name)
200 continue;
202 rest = skip_prefix(arg, options->long_name);
203 if (options->type == OPTION_ARGUMENT) {
204 if (!rest)
205 continue;
206 if (*rest == '=')
207 return opterror(options, "takes no value", flags);
208 if (*rest)
209 continue;
210 p->out[p->cpidx++] = arg - 2;
211 return 0;
213 if (!rest) {
214 /* abbreviated? */
215 if (!strncmp(options->long_name, arg, arg_end - arg)) {
216 is_abbreviated:
217 if (abbrev_option) {
219 * If this is abbreviated, it is
220 * ambiguous. So when there is no
221 * exact match later, we need to
222 * error out.
224 ambiguous_option = abbrev_option;
225 ambiguous_flags = abbrev_flags;
227 if (!(flags & OPT_UNSET) && *arg_end)
228 p->opt = arg_end + 1;
229 abbrev_option = options;
230 abbrev_flags = flags;
231 continue;
233 /* negation allowed? */
234 if (options->flags & PARSE_OPT_NONEG)
235 continue;
236 /* negated and abbreviated very much? */
237 if (!prefixcmp("no-", arg)) {
238 flags |= OPT_UNSET;
239 goto is_abbreviated;
241 /* negated? */
242 if (strncmp(arg, "no-", 3))
243 continue;
244 flags |= OPT_UNSET;
245 rest = skip_prefix(arg + 3, options->long_name);
246 /* abbreviated and negated? */
247 if (!rest && !prefixcmp(options->long_name, arg + 3))
248 goto is_abbreviated;
249 if (!rest)
250 continue;
252 if (*rest) {
253 if (*rest != '=')
254 continue;
255 p->opt = rest + 1;
257 return get_value(p, options, flags);
260 if (ambiguous_option)
261 return error("Ambiguous option: %s "
262 "(could be --%s%s or --%s%s)",
263 arg,
264 (ambiguous_flags & OPT_UNSET) ? "no-" : "",
265 ambiguous_option->long_name,
266 (abbrev_flags & OPT_UNSET) ? "no-" : "",
267 abbrev_option->long_name);
268 if (abbrev_option)
269 return get_value(p, abbrev_option, abbrev_flags);
270 return -2;
273 static int parse_nodash_opt(struct parse_opt_ctx_t *p, const char *arg,
274 const struct option *options)
276 for (; options->type != OPTION_END; options++) {
277 if (!(options->flags & PARSE_OPT_NODASH))
278 continue;
279 if (options->short_name == arg[0] && arg[1] == '\0')
280 return get_value(p, options, OPT_SHORT);
282 return -2;
285 static void check_typos(const char *arg, const struct option *options)
287 if (strlen(arg) < 3)
288 return;
290 if (!prefixcmp(arg, "no-")) {
291 error ("did you mean `--%s` (with two dashes ?)", arg);
292 exit(129);
295 for (; options->type != OPTION_END; options++) {
296 if (!options->long_name)
297 continue;
298 if (!prefixcmp(options->long_name, arg)) {
299 error ("did you mean `--%s` (with two dashes ?)", arg);
300 exit(129);
305 static void parse_options_check(const struct option *opts)
307 int err = 0;
309 for (; opts->type != OPTION_END; opts++) {
310 if ((opts->flags & PARSE_OPT_LASTARG_DEFAULT) &&
311 (opts->flags & PARSE_OPT_OPTARG))
312 err |= optbug(opts, "uses incompatible flags "
313 "LASTARG_DEFAULT and OPTARG");
314 if (opts->flags & PARSE_OPT_NODASH &&
315 ((opts->flags & PARSE_OPT_OPTARG) ||
316 !(opts->flags & PARSE_OPT_NOARG) ||
317 !(opts->flags & PARSE_OPT_NONEG) ||
318 opts->long_name))
319 err |= optbug(opts, "uses feature "
320 "not supported for dashless options");
321 switch (opts->type) {
322 case OPTION_COUNTUP:
323 case OPTION_BIT:
324 case OPTION_NEGBIT:
325 case OPTION_SET_INT:
326 case OPTION_SET_PTR:
327 case OPTION_NUMBER:
328 if ((opts->flags & PARSE_OPT_OPTARG) ||
329 !(opts->flags & PARSE_OPT_NOARG))
330 err |= optbug(opts, "should not accept an argument");
331 default:
332 ; /* ok. (usually accepts an argument) */
335 if (err)
336 exit(128);
339 void parse_options_start(struct parse_opt_ctx_t *ctx,
340 int argc, const char **argv, const char *prefix,
341 const struct option *options, int flags)
343 memset(ctx, 0, sizeof(*ctx));
344 ctx->argc = argc - 1;
345 ctx->argv = argv + 1;
346 ctx->out = argv;
347 ctx->prefix = prefix;
348 ctx->cpidx = ((flags & PARSE_OPT_KEEP_ARGV0) != 0);
349 ctx->flags = flags;
350 if ((flags & PARSE_OPT_KEEP_UNKNOWN) &&
351 (flags & PARSE_OPT_STOP_AT_NON_OPTION))
352 die("STOP_AT_NON_OPTION and KEEP_UNKNOWN don't go together");
353 parse_options_check(options);
356 static int usage_with_options_internal(struct parse_opt_ctx_t *,
357 const char * const *,
358 const struct option *, int, int);
360 int parse_options_step(struct parse_opt_ctx_t *ctx,
361 const struct option *options,
362 const char * const usagestr[])
364 int internal_help = !(ctx->flags & PARSE_OPT_NO_INTERNAL_HELP);
366 /* we must reset ->opt, unknown short option leave it dangling */
367 ctx->opt = NULL;
369 for (; ctx->argc; ctx->argc--, ctx->argv++) {
370 const char *arg = ctx->argv[0];
372 if (*arg != '-' || !arg[1]) {
373 if (parse_nodash_opt(ctx, arg, options) == 0)
374 continue;
375 if (ctx->flags & PARSE_OPT_STOP_AT_NON_OPTION)
376 return PARSE_OPT_NON_OPTION;
377 ctx->out[ctx->cpidx++] = ctx->argv[0];
378 continue;
381 if (arg[1] != '-') {
382 ctx->opt = arg + 1;
383 if (internal_help && *ctx->opt == 'h')
384 return parse_options_usage(ctx, usagestr, options, 0);
385 switch (parse_short_opt(ctx, options)) {
386 case -1:
387 return parse_options_usage(ctx, usagestr, options, 1);
388 case -2:
389 goto unknown;
391 if (ctx->opt)
392 check_typos(arg + 1, options);
393 while (ctx->opt) {
394 if (internal_help && *ctx->opt == 'h')
395 return parse_options_usage(ctx, usagestr, options, 0);
396 switch (parse_short_opt(ctx, options)) {
397 case -1:
398 return parse_options_usage(ctx, usagestr, options, 1);
399 case -2:
400 /* fake a short option thing to hide the fact that we may have
401 * started to parse aggregated stuff
403 * This is leaky, too bad.
405 ctx->argv[0] = xstrdup(ctx->opt - 1);
406 *(char *)ctx->argv[0] = '-';
407 goto unknown;
410 continue;
413 if (!arg[2]) { /* "--" */
414 if (!(ctx->flags & PARSE_OPT_KEEP_DASHDASH)) {
415 ctx->argc--;
416 ctx->argv++;
418 break;
421 if (internal_help && !strcmp(arg + 2, "help-all"))
422 return usage_with_options_internal(ctx, usagestr, options, 1, 0);
423 if (internal_help && !strcmp(arg + 2, "help"))
424 return parse_options_usage(ctx, usagestr, options, 0);
425 switch (parse_long_opt(ctx, arg + 2, options)) {
426 case -1:
427 return parse_options_usage(ctx, usagestr, options, 1);
428 case -2:
429 goto unknown;
431 continue;
432 unknown:
433 if (!(ctx->flags & PARSE_OPT_KEEP_UNKNOWN))
434 return PARSE_OPT_UNKNOWN;
435 ctx->out[ctx->cpidx++] = ctx->argv[0];
436 ctx->opt = NULL;
438 return PARSE_OPT_DONE;
441 int parse_options_end(struct parse_opt_ctx_t *ctx)
443 memmove(ctx->out + ctx->cpidx, ctx->argv, ctx->argc * sizeof(*ctx->out));
444 ctx->out[ctx->cpidx + ctx->argc] = NULL;
445 return ctx->cpidx + ctx->argc;
448 int parse_options(int argc, const char **argv, const char *prefix,
449 const struct option *options, const char * const usagestr[],
450 int flags)
452 struct parse_opt_ctx_t ctx;
454 parse_options_start(&ctx, argc, argv, prefix, options, flags);
455 switch (parse_options_step(&ctx, options, usagestr)) {
456 case PARSE_OPT_HELP:
457 exit(129);
458 case PARSE_OPT_NON_OPTION:
459 case PARSE_OPT_DONE:
460 break;
461 default: /* PARSE_OPT_UNKNOWN */
462 if (ctx.argv[0][1] == '-') {
463 error("unknown option `%s'", ctx.argv[0] + 2);
464 } else {
465 error("unknown switch `%c'", *ctx.opt);
467 usage_with_options(usagestr, options);
470 return parse_options_end(&ctx);
473 static int usage_argh(const struct option *opts, FILE *outfile)
475 const char *s;
476 int literal = (opts->flags & PARSE_OPT_LITERAL_ARGHELP) || !opts->argh;
477 if (opts->flags & PARSE_OPT_OPTARG)
478 if (opts->long_name)
479 s = literal ? "[=%s]" : "[=<%s>]";
480 else
481 s = literal ? "[%s]" : "[<%s>]";
482 else
483 s = literal ? " %s" : " <%s>";
484 return fprintf(outfile, s, opts->argh ? opts->argh : "...");
487 #define USAGE_OPTS_WIDTH 24
488 #define USAGE_GAP 2
490 static int usage_with_options_internal(struct parse_opt_ctx_t *ctx,
491 const char * const *usagestr,
492 const struct option *opts, int full, int err)
494 FILE *outfile = err ? stderr : stdout;
496 if (!usagestr)
497 return PARSE_OPT_HELP;
499 if (!err && ctx && ctx->flags & PARSE_OPT_SHELL_EVAL)
500 fprintf(outfile, "cat <<\\EOF\n");
502 fprintf(outfile, "usage: %s\n", *usagestr++);
503 while (*usagestr && **usagestr)
504 fprintf(outfile, " or: %s\n", *usagestr++);
505 while (*usagestr) {
506 fprintf(outfile, "%s%s\n",
507 **usagestr ? " " : "",
508 *usagestr);
509 usagestr++;
512 if (opts->type != OPTION_GROUP)
513 fputc('\n', outfile);
515 for (; opts->type != OPTION_END; opts++) {
516 size_t pos;
517 int pad;
519 if (opts->type == OPTION_GROUP) {
520 fputc('\n', outfile);
521 if (*opts->help)
522 fprintf(outfile, "%s\n", opts->help);
523 continue;
525 if (!full && (opts->flags & PARSE_OPT_HIDDEN))
526 continue;
528 pos = fprintf(outfile, " ");
529 if (opts->short_name && !(opts->flags & PARSE_OPT_NEGHELP)) {
530 if (opts->flags & PARSE_OPT_NODASH)
531 pos += fprintf(outfile, "%c", opts->short_name);
532 else
533 pos += fprintf(outfile, "-%c", opts->short_name);
535 if (opts->long_name && opts->short_name)
536 pos += fprintf(outfile, ", ");
537 if (opts->long_name)
538 pos += fprintf(outfile, "--%s%s",
539 (opts->flags & PARSE_OPT_NEGHELP) ? "no-" : "",
540 opts->long_name);
541 if (opts->type == OPTION_NUMBER)
542 pos += fprintf(outfile, "-NUM");
544 if ((opts->flags & PARSE_OPT_LITERAL_ARGHELP) ||
545 !(opts->flags & PARSE_OPT_NOARG))
546 pos += usage_argh(opts, outfile);
548 if (pos <= USAGE_OPTS_WIDTH)
549 pad = USAGE_OPTS_WIDTH - pos;
550 else {
551 fputc('\n', outfile);
552 pad = USAGE_OPTS_WIDTH;
554 fprintf(outfile, "%*s%s\n", pad + USAGE_GAP, "", opts->help);
556 fputc('\n', outfile);
558 if (!err && ctx && ctx->flags & PARSE_OPT_SHELL_EVAL)
559 fputs("EOF\n", outfile);
561 return PARSE_OPT_HELP;
564 void NORETURN usage_with_options(const char * const *usagestr,
565 const struct option *opts)
567 usage_with_options_internal(NULL, usagestr, opts, 0, 1);
568 exit(129);
571 void NORETURN usage_msg_opt(const char *msg,
572 const char * const *usagestr,
573 const struct option *options)
575 fprintf(stderr, "%s\n\n", msg);
576 usage_with_options(usagestr, options);
579 static int parse_options_usage(struct parse_opt_ctx_t *ctx,
580 const char * const *usagestr,
581 const struct option *opts, int err)
583 return usage_with_options_internal(ctx, usagestr, opts, 0, err);