Code

Merge branch 'maint'
[git.git] / parse-options.c
1 #include "git-compat-util.h"
2 #include "parse-options.h"
3 #include "cache.h"
4 #include "commit.h"
6 #define OPT_SHORT 1
7 #define OPT_UNSET 2
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 }
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;
26         } else if (p->argc > 1) {
27                 p->argc--;
28                 *arg = *++p->argv;
29         } else
30                 return opterror(opt, "requires a value", flags);
31         return 0;
32 }
34 static int get_value(struct parse_opt_ctx_t *p,
35                      const struct option *opt, int flags)
36 {
37         const char *s, *arg;
38         const int unset = flags & OPT_UNSET;
40         if (unset && p->opt)
41                 return opterror(opt, "takes no value", flags);
42         if (unset && (opt->flags & PARSE_OPT_NONEG))
43                 return opterror(opt, "isn't available", flags);
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_NEGBIT:
54                 case OPTION_SET_INT:
55                 case OPTION_SET_PTR:
56                         return opterror(opt, "takes no value", flags);
57                 default:
58                         break;
59                 }
60         }
62         switch (opt->type) {
63         case OPTION_BIT:
64                 if (unset)
65                         *(int *)opt->value &= ~opt->defval;
66                 else
67                         *(int *)opt->value |= opt->defval;
68                 return 0;
70         case OPTION_NEGBIT:
71                 if (unset)
72                         *(int *)opt->value |= opt->defval;
73                 else
74                         *(int *)opt->value &= ~opt->defval;
75                 return 0;
77         case OPTION_BOOLEAN:
78                 *(int *)opt->value = unset ? 0 : *(int *)opt->value + 1;
79                 return 0;
81         case OPTION_SET_INT:
82                 *(int *)opt->value = unset ? 0 : opt->defval;
83                 return 0;
85         case OPTION_SET_PTR:
86                 *(void **)opt->value = unset ? NULL : (void *)opt->defval;
87                 return 0;
89         case OPTION_STRING:
90                 if (unset)
91                         *(const char **)opt->value = NULL;
92                 else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
93                         *(const char **)opt->value = (const char *)opt->defval;
94                 else
95                         return get_arg(p, opt, flags, (const char **)opt->value);
96                 return 0;
98         case OPTION_CALLBACK:
99                 if (unset)
100                         return (*opt->callback)(opt, NULL, 1) ? (-1) : 0;
101                 if (opt->flags & PARSE_OPT_NOARG)
102                         return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
103                 if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
104                         return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
105                 if (get_arg(p, opt, flags, &arg))
106                         return -1;
107                 return (*opt->callback)(opt, arg, 0) ? (-1) : 0;
109         case OPTION_INTEGER:
110                 if (unset) {
111                         *(int *)opt->value = 0;
112                         return 0;
113                 }
114                 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
115                         *(int *)opt->value = opt->defval;
116                         return 0;
117                 }
118                 if (get_arg(p, opt, flags, &arg))
119                         return -1;
120                 *(int *)opt->value = strtol(arg, (char **)&s, 10);
121                 if (*s)
122                         return opterror(opt, "expects a numerical value", flags);
123                 return 0;
125         default:
126                 die("should not happen, someone must be hit on the forehead");
127         }
130 static int parse_short_opt(struct parse_opt_ctx_t *p, const struct option *options)
132         const struct option *numopt = NULL;
134         for (; options->type != OPTION_END; options++) {
135                 if (options->short_name == *p->opt) {
136                         p->opt = p->opt[1] ? p->opt + 1 : NULL;
137                         return get_value(p, options, OPT_SHORT);
138                 }
140                 /*
141                  * Handle the numerical option later, explicit one-digit
142                  * options take precedence over it.
143                  */
144                 if (options->type == OPTION_NUMBER)
145                         numopt = options;
146         }
147         if (numopt && isdigit(*p->opt)) {
148                 size_t len = 1;
149                 char *arg;
150                 int rc;
152                 while (isdigit(p->opt[len]))
153                         len++;
154                 arg = xmemdupz(p->opt, len);
155                 p->opt = p->opt[len] ? p->opt + len : NULL;
156                 rc = (*numopt->callback)(numopt, arg, 0) ? (-1) : 0;
157                 free(arg);
158                 return rc;
159         }
160         return -2;
163 static int parse_long_opt(struct parse_opt_ctx_t *p, const char *arg,
164                           const struct option *options)
166         const char *arg_end = strchr(arg, '=');
167         const struct option *abbrev_option = NULL, *ambiguous_option = NULL;
168         int abbrev_flags = 0, ambiguous_flags = 0;
170         if (!arg_end)
171                 arg_end = arg + strlen(arg);
173         for (; options->type != OPTION_END; options++) {
174                 const char *rest;
175                 int flags = 0;
177                 if (!options->long_name)
178                         continue;
180                 rest = skip_prefix(arg, options->long_name);
181                 if (options->type == OPTION_ARGUMENT) {
182                         if (!rest)
183                                 continue;
184                         if (*rest == '=')
185                                 return opterror(options, "takes no value", flags);
186                         if (*rest)
187                                 continue;
188                         p->out[p->cpidx++] = arg - 2;
189                         return 0;
190                 }
191                 if (!rest) {
192                         /* abbreviated? */
193                         if (!strncmp(options->long_name, arg, arg_end - arg)) {
194 is_abbreviated:
195                                 if (abbrev_option) {
196                                         /*
197                                          * If this is abbreviated, it is
198                                          * ambiguous. So when there is no
199                                          * exact match later, we need to
200                                          * error out.
201                                          */
202                                         ambiguous_option = abbrev_option;
203                                         ambiguous_flags = abbrev_flags;
204                                 }
205                                 if (!(flags & OPT_UNSET) && *arg_end)
206                                         p->opt = arg_end + 1;
207                                 abbrev_option = options;
208                                 abbrev_flags = flags;
209                                 continue;
210                         }
211                         /* negated and abbreviated very much? */
212                         if (!prefixcmp("no-", arg)) {
213                                 flags |= OPT_UNSET;
214                                 goto is_abbreviated;
215                         }
216                         /* negated? */
217                         if (strncmp(arg, "no-", 3))
218                                 continue;
219                         flags |= OPT_UNSET;
220                         rest = skip_prefix(arg + 3, options->long_name);
221                         /* abbreviated and negated? */
222                         if (!rest && !prefixcmp(options->long_name, arg + 3))
223                                 goto is_abbreviated;
224                         if (!rest)
225                                 continue;
226                 }
227                 if (*rest) {
228                         if (*rest != '=')
229                                 continue;
230                         p->opt = rest + 1;
231                 }
232                 return get_value(p, options, flags);
233         }
235         if (ambiguous_option)
236                 return error("Ambiguous option: %s "
237                         "(could be --%s%s or --%s%s)",
238                         arg,
239                         (ambiguous_flags & OPT_UNSET) ?  "no-" : "",
240                         ambiguous_option->long_name,
241                         (abbrev_flags & OPT_UNSET) ?  "no-" : "",
242                         abbrev_option->long_name);
243         if (abbrev_option)
244                 return get_value(p, abbrev_option, abbrev_flags);
245         return -2;
248 static int parse_nodash_opt(struct parse_opt_ctx_t *p, const char *arg,
249                             const struct option *options)
251         for (; options->type != OPTION_END; options++) {
252                 if (!(options->flags & PARSE_OPT_NODASH))
253                         continue;
254                 if ((options->flags & PARSE_OPT_OPTARG) ||
255                     !(options->flags & PARSE_OPT_NOARG))
256                         die("BUG: dashless options don't support arguments");
257                 if (!(options->flags & PARSE_OPT_NONEG))
258                         die("BUG: dashless options don't support negation");
259                 if (options->long_name)
260                         die("BUG: dashless options can't be long");
261                 if (options->short_name == arg[0] && arg[1] == '\0')
262                         return get_value(p, options, OPT_SHORT);
263         }
264         return -2;
267 static void check_typos(const char *arg, const struct option *options)
269         if (strlen(arg) < 3)
270                 return;
272         if (!prefixcmp(arg, "no-")) {
273                 error ("did you mean `--%s` (with two dashes ?)", arg);
274                 exit(129);
275         }
277         for (; options->type != OPTION_END; options++) {
278                 if (!options->long_name)
279                         continue;
280                 if (!prefixcmp(options->long_name, arg)) {
281                         error ("did you mean `--%s` (with two dashes ?)", arg);
282                         exit(129);
283                 }
284         }
287 void parse_options_start(struct parse_opt_ctx_t *ctx,
288                          int argc, const char **argv, int flags)
290         memset(ctx, 0, sizeof(*ctx));
291         ctx->argc = argc - 1;
292         ctx->argv = argv + 1;
293         ctx->out  = argv;
294         ctx->cpidx = ((flags & PARSE_OPT_KEEP_ARGV0) != 0);
295         ctx->flags = flags;
296         if ((flags & PARSE_OPT_KEEP_UNKNOWN) &&
297             (flags & PARSE_OPT_STOP_AT_NON_OPTION))
298                 die("STOP_AT_NON_OPTION and KEEP_UNKNOWN don't go together");
301 static int usage_with_options_internal(const char * const *,
302                                        const struct option *, int);
304 int parse_options_step(struct parse_opt_ctx_t *ctx,
305                        const struct option *options,
306                        const char * const usagestr[])
308         int internal_help = !(ctx->flags & PARSE_OPT_NO_INTERNAL_HELP);
310         /* we must reset ->opt, unknown short option leave it dangling */
311         ctx->opt = NULL;
313         for (; ctx->argc; ctx->argc--, ctx->argv++) {
314                 const char *arg = ctx->argv[0];
316                 if (*arg != '-' || !arg[1]) {
317                         if (parse_nodash_opt(ctx, arg, options) == 0)
318                                 continue;
319                         if (ctx->flags & PARSE_OPT_STOP_AT_NON_OPTION)
320                                 break;
321                         ctx->out[ctx->cpidx++] = ctx->argv[0];
322                         continue;
323                 }
325                 if (arg[1] != '-') {
326                         ctx->opt = arg + 1;
327                         if (internal_help && *ctx->opt == 'h')
328                                 return parse_options_usage(usagestr, options);
329                         switch (parse_short_opt(ctx, options)) {
330                         case -1:
331                                 return parse_options_usage(usagestr, options);
332                         case -2:
333                                 goto unknown;
334                         }
335                         if (ctx->opt)
336                                 check_typos(arg + 1, options);
337                         while (ctx->opt) {
338                                 if (internal_help && *ctx->opt == 'h')
339                                         return parse_options_usage(usagestr, options);
340                                 switch (parse_short_opt(ctx, options)) {
341                                 case -1:
342                                         return parse_options_usage(usagestr, options);
343                                 case -2:
344                                         /* fake a short option thing to hide the fact that we may have
345                                          * started to parse aggregated stuff
346                                          *
347                                          * This is leaky, too bad.
348                                          */
349                                         ctx->argv[0] = xstrdup(ctx->opt - 1);
350                                         *(char *)ctx->argv[0] = '-';
351                                         goto unknown;
352                                 }
353                         }
354                         continue;
355                 }
357                 if (!arg[2]) { /* "--" */
358                         if (!(ctx->flags & PARSE_OPT_KEEP_DASHDASH)) {
359                                 ctx->argc--;
360                                 ctx->argv++;
361                         }
362                         break;
363                 }
365                 if (internal_help && !strcmp(arg + 2, "help-all"))
366                         return usage_with_options_internal(usagestr, options, 1);
367                 if (internal_help && !strcmp(arg + 2, "help"))
368                         return parse_options_usage(usagestr, options);
369                 switch (parse_long_opt(ctx, arg + 2, options)) {
370                 case -1:
371                         return parse_options_usage(usagestr, options);
372                 case -2:
373                         goto unknown;
374                 }
375                 continue;
376 unknown:
377                 if (!(ctx->flags & PARSE_OPT_KEEP_UNKNOWN))
378                         return PARSE_OPT_UNKNOWN;
379                 ctx->out[ctx->cpidx++] = ctx->argv[0];
380                 ctx->opt = NULL;
381         }
382         return PARSE_OPT_DONE;
385 int parse_options_end(struct parse_opt_ctx_t *ctx)
387         memmove(ctx->out + ctx->cpidx, ctx->argv, ctx->argc * sizeof(*ctx->out));
388         ctx->out[ctx->cpidx + ctx->argc] = NULL;
389         return ctx->cpidx + ctx->argc;
392 int parse_options(int argc, const char **argv, const struct option *options,
393                   const char * const usagestr[], int flags)
395         struct parse_opt_ctx_t ctx;
397         parse_options_start(&ctx, argc, argv, flags);
398         switch (parse_options_step(&ctx, options, usagestr)) {
399         case PARSE_OPT_HELP:
400                 exit(129);
401         case PARSE_OPT_DONE:
402                 break;
403         default: /* PARSE_OPT_UNKNOWN */
404                 if (ctx.argv[0][1] == '-') {
405                         error("unknown option `%s'", ctx.argv[0] + 2);
406                 } else {
407                         error("unknown switch `%c'", *ctx.opt);
408                 }
409                 usage_with_options(usagestr, options);
410         }
412         return parse_options_end(&ctx);
415 #define USAGE_OPTS_WIDTH 24
416 #define USAGE_GAP         2
418 int usage_with_options_internal(const char * const *usagestr,
419                                 const struct option *opts, int full)
421         if (!usagestr)
422                 return PARSE_OPT_HELP;
424         fprintf(stderr, "usage: %s\n", *usagestr++);
425         while (*usagestr && **usagestr)
426                 fprintf(stderr, "   or: %s\n", *usagestr++);
427         while (*usagestr) {
428                 fprintf(stderr, "%s%s\n",
429                                 **usagestr ? "    " : "",
430                                 *usagestr);
431                 usagestr++;
432         }
434         if (opts->type != OPTION_GROUP)
435                 fputc('\n', stderr);
437         for (; opts->type != OPTION_END; opts++) {
438                 size_t pos;
439                 int pad;
441                 if (opts->type == OPTION_GROUP) {
442                         fputc('\n', stderr);
443                         if (*opts->help)
444                                 fprintf(stderr, "%s\n", opts->help);
445                         continue;
446                 }
447                 if (!full && (opts->flags & PARSE_OPT_HIDDEN))
448                         continue;
450                 pos = fprintf(stderr, "    ");
451                 if (opts->short_name) {
452                         if (opts->flags & PARSE_OPT_NODASH)
453                                 pos += fprintf(stderr, "%c", opts->short_name);
454                         else
455                                 pos += fprintf(stderr, "-%c", opts->short_name);
456                 }
457                 if (opts->long_name && opts->short_name)
458                         pos += fprintf(stderr, ", ");
459                 if (opts->long_name)
460                         pos += fprintf(stderr, "--%s", opts->long_name);
461                 if (opts->type == OPTION_NUMBER)
462                         pos += fprintf(stderr, "-NUM");
464                 switch (opts->type) {
465                 case OPTION_ARGUMENT:
466                         break;
467                 case OPTION_INTEGER:
468                         if (opts->flags & PARSE_OPT_OPTARG)
469                                 if (opts->long_name)
470                                         pos += fprintf(stderr, "[=<n>]");
471                                 else
472                                         pos += fprintf(stderr, "[<n>]");
473                         else
474                                 pos += fprintf(stderr, " <n>");
475                         break;
476                 case OPTION_CALLBACK:
477                         if (opts->flags & PARSE_OPT_NOARG)
478                                 break;
479                         /* FALLTHROUGH */
480                 case OPTION_STRING:
481                         if (opts->argh) {
482                                 if (opts->flags & PARSE_OPT_OPTARG)
483                                         if (opts->long_name)
484                                                 pos += fprintf(stderr, "[=<%s>]", opts->argh);
485                                         else
486                                                 pos += fprintf(stderr, "[<%s>]", opts->argh);
487                                 else
488                                         pos += fprintf(stderr, " <%s>", opts->argh);
489                         } else {
490                                 if (opts->flags & PARSE_OPT_OPTARG)
491                                         if (opts->long_name)
492                                                 pos += fprintf(stderr, "[=...]");
493                                         else
494                                                 pos += fprintf(stderr, "[...]");
495                                 else
496                                         pos += fprintf(stderr, " ...");
497                         }
498                         break;
499                 default: /* OPTION_{BIT,BOOLEAN,NUMBER,SET_INT,SET_PTR} */
500                         break;
501                 }
503                 if (pos <= USAGE_OPTS_WIDTH)
504                         pad = USAGE_OPTS_WIDTH - pos;
505                 else {
506                         fputc('\n', stderr);
507                         pad = USAGE_OPTS_WIDTH;
508                 }
509                 fprintf(stderr, "%*s%s\n", pad + USAGE_GAP, "", opts->help);
510         }
511         fputc('\n', stderr);
513         return PARSE_OPT_HELP;
516 void usage_with_options(const char * const *usagestr,
517                         const struct option *opts)
519         usage_with_options_internal(usagestr, opts, 0);
520         exit(129);
523 int parse_options_usage(const char * const *usagestr,
524                         const struct option *opts)
526         return usage_with_options_internal(usagestr, opts, 0);
530 /*----- some often used options -----*/
531 #include "cache.h"
533 int parse_opt_abbrev_cb(const struct option *opt, const char *arg, int unset)
535         int v;
537         if (!arg) {
538                 v = unset ? 0 : DEFAULT_ABBREV;
539         } else {
540                 v = strtol(arg, (char **)&arg, 10);
541                 if (*arg)
542                         return opterror(opt, "expects a numerical value", 0);
543                 if (v && v < MINIMUM_ABBREV)
544                         v = MINIMUM_ABBREV;
545                 else if (v > 40)
546                         v = 40;
547         }
548         *(int *)(opt->value) = v;
549         return 0;
552 int parse_opt_approxidate_cb(const struct option *opt, const char *arg,
553                              int unset)
555         *(unsigned long *)(opt->value) = approxidate(arg);
556         return 0;
559 int parse_opt_verbosity_cb(const struct option *opt, const char *arg,
560                            int unset)
562         int *target = opt->value;
564         if (unset)
565                 /* --no-quiet, --no-verbose */
566                 *target = 0;
567         else if (opt->short_name == 'v') {
568                 if (*target >= 0)
569                         (*target)++;
570                 else
571                         *target = 1;
572         } else {
573                 if (*target <= 0)
574                         (*target)--;
575                 else
576                         *target = -1;
577         }
578         return 0;
581 int parse_opt_with_commit(const struct option *opt, const char *arg, int unset)
583         unsigned char sha1[20];
584         struct commit *commit;
586         if (!arg)
587                 return -1;
588         if (get_sha1(arg, sha1))
589                 return error("malformed object name %s", arg);
590         commit = lookup_commit_reference(sha1);
591         if (!commit)
592                 return error("no such commit %s", arg);
593         commit_list_insert(commit, opt->value);
594         return 0;
597 /*
598  * This should really be OPTION_FILENAME type as a part of
599  * parse_options that take prefix to do this while parsing.
600  */
601 extern const char *parse_options_fix_filename(const char *prefix, const char *file)
603         if (!file || !prefix || is_absolute_path(file) || !strcmp("-", file))
604                 return file;
605         return prefix_filename(prefix, strlen(prefix), file);