blame.c: Properly initialize strbuf after calling, textconv_object()
[git/dscho.git] / parse-options.c
blob0fa79bc31d322e2aab8fce738ca6489a35a51ca4
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 static int opterror(const struct option *opt, const char *reason, int flags)
16 if (flags & OPT_SHORT)
17 return error("switch `%c' %s", opt->short_name, reason);
18 if (flags & OPT_UNSET)
19 return error("option `no-%s' %s", opt->long_name, reason);
20 return error("option `%s' %s", opt->long_name, reason);
23 static int get_arg(struct parse_opt_ctx_t *p, const struct option *opt,
24 int flags, const char **arg)
26 if (p->opt) {
27 *arg = p->opt;
28 p->opt = NULL;
29 } else if (p->argc == 1 && (opt->flags & PARSE_OPT_LASTARG_DEFAULT)) {
30 *arg = (const char *)opt->defval;
31 } else if (p->argc > 1) {
32 p->argc--;
33 *arg = *++p->argv;
34 } else
35 return opterror(opt, "requires a value", flags);
36 return 0;
39 static void fix_filename(const char *prefix, const char **file)
41 if (!file || !*file || !prefix || is_absolute_path(*file)
42 || !strcmp("-", *file))
43 return;
44 *file = xstrdup(prefix_filename(prefix, strlen(prefix), *file));
47 static int get_value(struct parse_opt_ctx_t *p,
48 const struct option *opt, int flags)
50 const char *s, *arg;
51 const int unset = flags & OPT_UNSET;
52 int err;
54 if (unset && p->opt)
55 return opterror(opt, "takes no value", flags);
56 if (unset && (opt->flags & PARSE_OPT_NONEG))
57 return opterror(opt, "isn't available", flags);
59 if (!(flags & OPT_SHORT) && p->opt) {
60 switch (opt->type) {
61 case OPTION_CALLBACK:
62 if (!(opt->flags & PARSE_OPT_NOARG))
63 break;
64 /* FALLTHROUGH */
65 case OPTION_BOOLEAN:
66 case OPTION_BIT:
67 case OPTION_NEGBIT:
68 case OPTION_SET_INT:
69 case OPTION_SET_PTR:
70 return opterror(opt, "takes no value", flags);
71 default:
72 break;
76 switch (opt->type) {
77 case OPTION_BIT:
78 if (unset)
79 *(int *)opt->value &= ~opt->defval;
80 else
81 *(int *)opt->value |= opt->defval;
82 return 0;
84 case OPTION_NEGBIT:
85 if (unset)
86 *(int *)opt->value |= opt->defval;
87 else
88 *(int *)opt->value &= ~opt->defval;
89 return 0;
91 case OPTION_BOOLEAN:
92 *(int *)opt->value = unset ? 0 : *(int *)opt->value + 1;
93 return 0;
95 case OPTION_SET_INT:
96 *(int *)opt->value = unset ? 0 : opt->defval;
97 return 0;
99 case OPTION_SET_PTR:
100 *(void **)opt->value = unset ? NULL : (void *)opt->defval;
101 return 0;
103 case OPTION_STRING:
104 if (unset)
105 *(const char **)opt->value = NULL;
106 else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
107 *(const char **)opt->value = (const char *)opt->defval;
108 else
109 return get_arg(p, opt, flags, (const char **)opt->value);
110 return 0;
112 case OPTION_FILENAME:
113 err = 0;
114 if (unset)
115 *(const char **)opt->value = NULL;
116 else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
117 *(const char **)opt->value = (const char *)opt->defval;
118 else
119 err = get_arg(p, opt, flags, (const char **)opt->value);
121 if (!err)
122 fix_filename(p->prefix, (const char **)opt->value);
123 return err;
125 case OPTION_CALLBACK:
126 if (unset)
127 return (*opt->callback)(opt, NULL, 1) ? (-1) : 0;
128 if (opt->flags & PARSE_OPT_NOARG)
129 return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
130 if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
131 return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
132 if (get_arg(p, opt, flags, &arg))
133 return -1;
134 return (*opt->callback)(opt, arg, 0) ? (-1) : 0;
136 case OPTION_INTEGER:
137 if (unset) {
138 *(int *)opt->value = 0;
139 return 0;
141 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
142 *(int *)opt->value = opt->defval;
143 return 0;
145 if (get_arg(p, opt, flags, &arg))
146 return -1;
147 *(int *)opt->value = strtol(arg, (char **)&s, 10);
148 if (*s)
149 return opterror(opt, "expects a numerical value", flags);
150 return 0;
152 default:
153 die("should not happen, someone must be hit on the forehead");
157 static int parse_short_opt(struct parse_opt_ctx_t *p, const struct option *options)
159 const struct option *numopt = NULL;
161 for (; options->type != OPTION_END; options++) {
162 if (options->short_name == *p->opt) {
163 p->opt = p->opt[1] ? p->opt + 1 : NULL;
164 return get_value(p, options, OPT_SHORT);
168 * Handle the numerical option later, explicit one-digit
169 * options take precedence over it.
171 if (options->type == OPTION_NUMBER)
172 numopt = options;
174 if (numopt && isdigit(*p->opt)) {
175 size_t len = 1;
176 char *arg;
177 int rc;
179 while (isdigit(p->opt[len]))
180 len++;
181 arg = xmemdupz(p->opt, len);
182 p->opt = p->opt[len] ? p->opt + len : NULL;
183 rc = (*numopt->callback)(numopt, arg, 0) ? (-1) : 0;
184 free(arg);
185 return rc;
187 return -2;
190 static int parse_long_opt(struct parse_opt_ctx_t *p, const char *arg,
191 const struct option *options)
193 const char *arg_end = strchr(arg, '=');
194 const struct option *abbrev_option = NULL, *ambiguous_option = NULL;
195 int abbrev_flags = 0, ambiguous_flags = 0;
197 if (!arg_end)
198 arg_end = arg + strlen(arg);
200 for (; options->type != OPTION_END; options++) {
201 const char *rest;
202 int flags = 0;
204 if (!options->long_name)
205 continue;
207 rest = skip_prefix(arg, options->long_name);
208 if (options->type == OPTION_ARGUMENT) {
209 if (!rest)
210 continue;
211 if (*rest == '=')
212 return opterror(options, "takes no value", flags);
213 if (*rest)
214 continue;
215 p->out[p->cpidx++] = arg - 2;
216 return 0;
218 if (!rest) {
219 /* abbreviated? */
220 if (!strncmp(options->long_name, arg, arg_end - arg)) {
221 is_abbreviated:
222 if (abbrev_option) {
224 * If this is abbreviated, it is
225 * ambiguous. So when there is no
226 * exact match later, we need to
227 * error out.
229 ambiguous_option = abbrev_option;
230 ambiguous_flags = abbrev_flags;
232 if (!(flags & OPT_UNSET) && *arg_end)
233 p->opt = arg_end + 1;
234 abbrev_option = options;
235 abbrev_flags = flags;
236 continue;
238 /* negation allowed? */
239 if (options->flags & PARSE_OPT_NONEG)
240 continue;
241 /* negated and abbreviated very much? */
242 if (!prefixcmp("no-", arg)) {
243 flags |= OPT_UNSET;
244 goto is_abbreviated;
246 /* negated? */
247 if (strncmp(arg, "no-", 3))
248 continue;
249 flags |= OPT_UNSET;
250 rest = skip_prefix(arg + 3, options->long_name);
251 /* abbreviated and negated? */
252 if (!rest && !prefixcmp(options->long_name, arg + 3))
253 goto is_abbreviated;
254 if (!rest)
255 continue;
257 if (*rest) {
258 if (*rest != '=')
259 continue;
260 p->opt = rest + 1;
262 return get_value(p, options, flags);
265 if (ambiguous_option)
266 return error("Ambiguous option: %s "
267 "(could be --%s%s or --%s%s)",
268 arg,
269 (ambiguous_flags & OPT_UNSET) ? "no-" : "",
270 ambiguous_option->long_name,
271 (abbrev_flags & OPT_UNSET) ? "no-" : "",
272 abbrev_option->long_name);
273 if (abbrev_option)
274 return get_value(p, abbrev_option, abbrev_flags);
275 return -2;
278 static int parse_nodash_opt(struct parse_opt_ctx_t *p, const char *arg,
279 const struct option *options)
281 for (; options->type != OPTION_END; options++) {
282 if (!(options->flags & PARSE_OPT_NODASH))
283 continue;
284 if ((options->flags & PARSE_OPT_OPTARG) ||
285 !(options->flags & PARSE_OPT_NOARG))
286 die("BUG: dashless options don't support arguments");
287 if (!(options->flags & PARSE_OPT_NONEG))
288 die("BUG: dashless options don't support negation");
289 if (options->long_name)
290 die("BUG: dashless options can't be long");
291 if (options->short_name == arg[0] && arg[1] == '\0')
292 return get_value(p, options, OPT_SHORT);
294 return -2;
297 static void check_typos(const char *arg, const struct option *options)
299 if (strlen(arg) < 3)
300 return;
302 if (!prefixcmp(arg, "no-")) {
303 error ("did you mean `--%s` (with two dashes ?)", arg);
304 exit(129);
307 for (; options->type != OPTION_END; options++) {
308 if (!options->long_name)
309 continue;
310 if (!prefixcmp(options->long_name, arg)) {
311 error ("did you mean `--%s` (with two dashes ?)", arg);
312 exit(129);
317 static void parse_options_check(const struct option *opts)
319 int err = 0;
321 for (; opts->type != OPTION_END; opts++) {
322 if ((opts->flags & PARSE_OPT_LASTARG_DEFAULT) &&
323 (opts->flags & PARSE_OPT_OPTARG)) {
324 if (opts->long_name) {
325 error("`--%s` uses incompatible flags "
326 "LASTARG_DEFAULT and OPTARG", opts->long_name);
327 } else {
328 error("`-%c` uses incompatible flags "
329 "LASTARG_DEFAULT and OPTARG", opts->short_name);
331 err |= 1;
335 if (err)
336 exit(129);
339 void parse_options_start(struct parse_opt_ctx_t *ctx,
340 int argc, const char **argv, const char *prefix,
341 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");
355 static int usage_with_options_internal(struct parse_opt_ctx_t *,
356 const char * const *,
357 const struct option *, int, int);
359 int parse_options_step(struct parse_opt_ctx_t *ctx,
360 const struct option *options,
361 const char * const usagestr[])
363 int internal_help = !(ctx->flags & PARSE_OPT_NO_INTERNAL_HELP);
365 parse_options_check(options);
367 /* we must reset ->opt, unknown short option leave it dangling */
368 ctx->opt = NULL;
370 for (; ctx->argc; ctx->argc--, ctx->argv++) {
371 const char *arg = ctx->argv[0];
373 if (*arg != '-' || !arg[1]) {
374 if (parse_nodash_opt(ctx, arg, options) == 0)
375 continue;
376 if (ctx->flags & PARSE_OPT_STOP_AT_NON_OPTION)
377 break;
378 ctx->out[ctx->cpidx++] = ctx->argv[0];
379 continue;
382 if (arg[1] != '-') {
383 ctx->opt = arg + 1;
384 if (internal_help && *ctx->opt == 'h')
385 return parse_options_usage(ctx, usagestr, options, 0);
386 switch (parse_short_opt(ctx, options)) {
387 case -1:
388 return parse_options_usage(ctx, usagestr, options, 1);
389 case -2:
390 goto unknown;
392 if (ctx->opt)
393 check_typos(arg + 1, options);
394 while (ctx->opt) {
395 if (internal_help && *ctx->opt == 'h')
396 return parse_options_usage(ctx, usagestr, options, 0);
397 switch (parse_short_opt(ctx, options)) {
398 case -1:
399 return parse_options_usage(ctx, usagestr, options, 1);
400 case -2:
401 /* fake a short option thing to hide the fact that we may have
402 * started to parse aggregated stuff
404 * This is leaky, too bad.
406 ctx->argv[0] = xstrdup(ctx->opt - 1);
407 *(char *)ctx->argv[0] = '-';
408 goto unknown;
411 continue;
414 if (!arg[2]) { /* "--" */
415 if (!(ctx->flags & PARSE_OPT_KEEP_DASHDASH)) {
416 ctx->argc--;
417 ctx->argv++;
419 break;
422 if (internal_help && !strcmp(arg + 2, "help-all"))
423 return usage_with_options_internal(ctx, usagestr, options, 1, 0);
424 if (internal_help && !strcmp(arg + 2, "help"))
425 return parse_options_usage(ctx, usagestr, options, 0);
426 switch (parse_long_opt(ctx, arg + 2, options)) {
427 case -1:
428 return parse_options_usage(ctx, usagestr, options, 1);
429 case -2:
430 goto unknown;
432 continue;
433 unknown:
434 if (!(ctx->flags & PARSE_OPT_KEEP_UNKNOWN))
435 return PARSE_OPT_UNKNOWN;
436 ctx->out[ctx->cpidx++] = ctx->argv[0];
437 ctx->opt = NULL;
439 return PARSE_OPT_DONE;
442 int parse_options_end(struct parse_opt_ctx_t *ctx)
444 memmove(ctx->out + ctx->cpidx, ctx->argv, ctx->argc * sizeof(*ctx->out));
445 ctx->out[ctx->cpidx + ctx->argc] = NULL;
446 return ctx->cpidx + ctx->argc;
449 int parse_options(int argc, const char **argv, const char *prefix,
450 const struct option *options, const char * const usagestr[],
451 int flags)
453 struct parse_opt_ctx_t ctx;
455 parse_options_start(&ctx, argc, argv, prefix, flags);
456 switch (parse_options_step(&ctx, options, usagestr)) {
457 case PARSE_OPT_HELP:
458 exit(129);
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_NOARG))
545 pos += usage_argh(opts, outfile);
547 if (pos <= USAGE_OPTS_WIDTH)
548 pad = USAGE_OPTS_WIDTH - pos;
549 else {
550 fputc('\n', outfile);
551 pad = USAGE_OPTS_WIDTH;
553 fprintf(outfile, "%*s%s\n", pad + USAGE_GAP, "", opts->help);
555 fputc('\n', outfile);
557 if (!err && ctx && ctx->flags & PARSE_OPT_SHELL_EVAL)
558 fputs("EOF\n", outfile);
560 return PARSE_OPT_HELP;
563 void usage_with_options(const char * const *usagestr,
564 const struct option *opts)
566 usage_with_options_internal(NULL, usagestr, opts, 0, 1);
567 exit(129);
570 void usage_msg_opt(const char *msg,
571 const char * const *usagestr,
572 const struct option *options)
574 fprintf(stderr, "%s\n\n", msg);
575 usage_with_options(usagestr, options);
578 static int parse_options_usage(struct parse_opt_ctx_t *ctx,
579 const char * const *usagestr,
580 const struct option *opts, int err)
582 return usage_with_options_internal(ctx, usagestr, opts, 0, err);
586 /*----- some often used options -----*/
587 #include "cache.h"
589 int parse_opt_abbrev_cb(const struct option *opt, const char *arg, int unset)
591 int v;
593 if (!arg) {
594 v = unset ? 0 : DEFAULT_ABBREV;
595 } else {
596 v = strtol(arg, (char **)&arg, 10);
597 if (*arg)
598 return opterror(opt, "expects a numerical value", 0);
599 if (v && v < MINIMUM_ABBREV)
600 v = MINIMUM_ABBREV;
601 else if (v > 40)
602 v = 40;
604 *(int *)(opt->value) = v;
605 return 0;
608 int parse_opt_approxidate_cb(const struct option *opt, const char *arg,
609 int unset)
611 *(unsigned long *)(opt->value) = approxidate(arg);
612 return 0;
615 int parse_opt_color_flag_cb(const struct option *opt, const char *arg,
616 int unset)
618 int value;
620 if (!arg)
621 arg = unset ? "never" : (const char *)opt->defval;
622 value = git_config_colorbool(NULL, arg, -1);
623 if (value < 0)
624 return opterror(opt,
625 "expects \"always\", \"auto\", or \"never\"", 0);
626 *(int *)opt->value = value;
627 return 0;
630 int parse_opt_verbosity_cb(const struct option *opt, const char *arg,
631 int unset)
633 int *target = opt->value;
635 if (unset)
636 /* --no-quiet, --no-verbose */
637 *target = 0;
638 else if (opt->short_name == 'v') {
639 if (*target >= 0)
640 (*target)++;
641 else
642 *target = 1;
643 } else {
644 if (*target <= 0)
645 (*target)--;
646 else
647 *target = -1;
649 return 0;
652 int parse_opt_with_commit(const struct option *opt, const char *arg, int unset)
654 unsigned char sha1[20];
655 struct commit *commit;
657 if (!arg)
658 return -1;
659 if (get_sha1(arg, sha1))
660 return error("malformed object name %s", arg);
661 commit = lookup_commit_reference(sha1);
662 if (!commit)
663 return error("no such commit %s", arg);
664 commit_list_insert(commit, opt->value);
665 return 0;
668 int parse_opt_tertiary(const struct option *opt, const char *arg, int unset)
670 int *target = opt->value;
671 *target = unset ? 2 : 1;
672 return 0;
675 int parse_options_concat(struct option *dst, size_t dst_size, struct option *src)
677 int i, j;
679 for (i = 0; i < dst_size; i++)
680 if (dst[i].type == OPTION_END)
681 break;
682 for (j = 0; i < dst_size; i++, j++) {
683 dst[i] = src[j];
684 if (src[j].type == OPTION_END)
685 return 0;
687 return -1;