1 #include "git-compat-util.h"
2 #include "parse-options.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);
14 int optbug(const struct option *opt, const char *reason)
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)
36 } else if (p->argc == 1 && (opt->flags & PARSE_OPT_LASTARG_DEFAULT)) {
37 *arg = (const char *)opt->defval;
38 } else if (p->argc > 1) {
42 return opterror(opt, "requires a value", flags);
46 static void fix_filename(const char *prefix, const char **file)
48 if (!file || !*file || !prefix || is_absolute_path(*file)
49 || !strcmp("-", *file))
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)
58 const int unset = flags & OPT_UNSET;
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);
69 case OPTION_LOWLEVEL_CALLBACK:
70 return (*(parse_opt_ll_cb *)opt->callback)(p, opt, unset);
74 *(int *)opt->value &= ~opt->defval;
76 *(int *)opt->value |= opt->defval;
81 *(int *)opt->value |= opt->defval;
83 *(int *)opt->value &= ~opt->defval;
87 *(int *)opt->value = unset ? 0 : *(int *)opt->value + 1;
91 *(int *)opt->value = unset ? 0 : opt->defval;
95 *(void **)opt->value = unset ? NULL : (void *)opt->defval;
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;
104 return get_arg(p, opt, flags, (const char **)opt->value);
107 case OPTION_FILENAME:
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;
114 err = get_arg(p, opt, flags, (const char **)opt->value);
117 fix_filename(p->prefix, (const char **)opt->value);
120 case OPTION_CALLBACK:
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))
129 return (*opt->callback)(opt, arg, 0) ? (-1) : 0;
133 *(int *)opt->value = 0;
136 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
137 *(int *)opt->value = opt->defval;
140 if (get_arg(p, opt, flags, &arg))
142 *(int *)opt->value = strtol(arg, (char **)&s, 10);
144 return opterror(opt, "expects a numerical value", flags);
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)
169 if (numopt && isdigit(*p->opt)) {
174 while (isdigit(p->opt[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;
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;
193 arg_end = arg + strlen(arg);
195 for (; options->type != OPTION_END; options++) {
196 const char *rest, *long_name = options->long_name;
197 int flags = 0, opt_flags = 0;
203 rest = skip_prefix(arg, long_name);
204 if (options->type == OPTION_ARGUMENT) {
208 return opterror(options, "takes no value", flags);
211 p->out[p->cpidx++] = arg - 2;
216 if (!strncmp(long_name, arg, arg_end - arg)) {
220 * If this is abbreviated, it is
221 * ambiguous. So when there is no
222 * exact match later, we need to
225 ambiguous_option = abbrev_option;
226 ambiguous_flags = abbrev_flags;
228 if (!(flags & OPT_UNSET) && *arg_end)
229 p->opt = arg_end + 1;
230 abbrev_option = options;
231 abbrev_flags = flags ^ opt_flags;
234 /* negation allowed? */
235 if (options->flags & PARSE_OPT_NONEG)
237 /* negated and abbreviated very much? */
238 if (!prefixcmp("no-", arg)) {
243 if (prefixcmp(arg, "no-")) {
244 if (!prefixcmp(long_name, "no-")) {
246 opt_flags |= OPT_UNSET;
252 rest = skip_prefix(arg + 3, long_name);
253 /* abbreviated and negated? */
254 if (!rest && !prefixcmp(long_name, arg + 3))
264 return get_value(p, options, flags ^ opt_flags);
267 if (ambiguous_option)
268 return error("Ambiguous option: %s "
269 "(could be --%s%s or --%s%s)",
271 (ambiguous_flags & OPT_UNSET) ? "no-" : "",
272 ambiguous_option->long_name,
273 (abbrev_flags & OPT_UNSET) ? "no-" : "",
274 abbrev_option->long_name);
276 return get_value(p, abbrev_option, abbrev_flags);
280 static int parse_nodash_opt(struct parse_opt_ctx_t *p, const char *arg,
281 const struct option *options)
283 for (; options->type != OPTION_END; options++) {
284 if (!(options->flags & PARSE_OPT_NODASH))
286 if (options->short_name == arg[0] && arg[1] == '\0')
287 return get_value(p, options, OPT_SHORT);
292 static void check_typos(const char *arg, const struct option *options)
297 if (!prefixcmp(arg, "no-")) {
298 error ("did you mean `--%s` (with two dashes ?)", arg);
302 for (; options->type != OPTION_END; options++) {
303 if (!options->long_name)
305 if (!prefixcmp(options->long_name, arg)) {
306 error ("did you mean `--%s` (with two dashes ?)", arg);
312 static void parse_options_check(const struct option *opts)
316 for (; opts->type != OPTION_END; opts++) {
317 if ((opts->flags & PARSE_OPT_LASTARG_DEFAULT) &&
318 (opts->flags & PARSE_OPT_OPTARG))
319 err |= optbug(opts, "uses incompatible flags "
320 "LASTARG_DEFAULT and OPTARG");
321 if (opts->flags & PARSE_OPT_NODASH &&
322 ((opts->flags & PARSE_OPT_OPTARG) ||
323 !(opts->flags & PARSE_OPT_NOARG) ||
324 !(opts->flags & PARSE_OPT_NONEG) ||
326 err |= optbug(opts, "uses feature "
327 "not supported for dashless options");
328 switch (opts->type) {
335 if ((opts->flags & PARSE_OPT_OPTARG) ||
336 !(opts->flags & PARSE_OPT_NOARG))
337 err |= optbug(opts, "should not accept an argument");
339 ; /* ok. (usually accepts an argument) */
346 void parse_options_start(struct parse_opt_ctx_t *ctx,
347 int argc, const char **argv, const char *prefix,
348 const struct option *options, int flags)
350 memset(ctx, 0, sizeof(*ctx));
351 ctx->argc = argc - 1;
352 ctx->argv = argv + 1;
354 ctx->prefix = prefix;
355 ctx->cpidx = ((flags & PARSE_OPT_KEEP_ARGV0) != 0);
357 if ((flags & PARSE_OPT_KEEP_UNKNOWN) &&
358 (flags & PARSE_OPT_STOP_AT_NON_OPTION))
359 die("STOP_AT_NON_OPTION and KEEP_UNKNOWN don't go together");
360 parse_options_check(options);
363 static int usage_with_options_internal(struct parse_opt_ctx_t *,
364 const char * const *,
365 const struct option *, int, int);
367 int parse_options_step(struct parse_opt_ctx_t *ctx,
368 const struct option *options,
369 const char * const usagestr[])
371 int internal_help = !(ctx->flags & PARSE_OPT_NO_INTERNAL_HELP);
373 /* we must reset ->opt, unknown short option leave it dangling */
376 for (; ctx->argc; ctx->argc--, ctx->argv++) {
377 const char *arg = ctx->argv[0];
379 if (*arg != '-' || !arg[1]) {
380 if (parse_nodash_opt(ctx, arg, options) == 0)
382 if (ctx->flags & PARSE_OPT_STOP_AT_NON_OPTION)
383 return PARSE_OPT_NON_OPTION;
384 ctx->out[ctx->cpidx++] = ctx->argv[0];
390 if (internal_help && *ctx->opt == 'h')
391 return parse_options_usage(ctx, usagestr, options, 0);
392 switch (parse_short_opt(ctx, options)) {
394 return parse_options_usage(ctx, usagestr, options, 1);
397 check_typos(arg + 1, options);
401 check_typos(arg + 1, options);
403 if (internal_help && *ctx->opt == 'h')
404 return parse_options_usage(ctx, usagestr, options, 0);
405 switch (parse_short_opt(ctx, options)) {
407 return parse_options_usage(ctx, usagestr, options, 1);
409 /* fake a short option thing to hide the fact that we may have
410 * started to parse aggregated stuff
412 * This is leaky, too bad.
414 ctx->argv[0] = xstrdup(ctx->opt - 1);
415 *(char *)ctx->argv[0] = '-';
422 if (!arg[2]) { /* "--" */
423 if (!(ctx->flags & PARSE_OPT_KEEP_DASHDASH)) {
430 if (internal_help && !strcmp(arg + 2, "help-all"))
431 return usage_with_options_internal(ctx, usagestr, options, 1, 0);
432 if (internal_help && !strcmp(arg + 2, "help"))
433 return parse_options_usage(ctx, usagestr, options, 0);
434 switch (parse_long_opt(ctx, arg + 2, options)) {
436 return parse_options_usage(ctx, usagestr, options, 1);
442 if (!(ctx->flags & PARSE_OPT_KEEP_UNKNOWN))
443 return PARSE_OPT_UNKNOWN;
444 ctx->out[ctx->cpidx++] = ctx->argv[0];
447 return PARSE_OPT_DONE;
450 int parse_options_end(struct parse_opt_ctx_t *ctx)
452 memmove(ctx->out + ctx->cpidx, ctx->argv, ctx->argc * sizeof(*ctx->out));
453 ctx->out[ctx->cpidx + ctx->argc] = NULL;
454 return ctx->cpidx + ctx->argc;
457 int parse_options(int argc, const char **argv, const char *prefix,
458 const struct option *options, const char * const usagestr[],
461 struct parse_opt_ctx_t ctx;
463 parse_options_start(&ctx, argc, argv, prefix, options, flags);
464 switch (parse_options_step(&ctx, options, usagestr)) {
467 case PARSE_OPT_NON_OPTION:
470 default: /* PARSE_OPT_UNKNOWN */
471 if (ctx.argv[0][1] == '-') {
472 error("unknown option `%s'", ctx.argv[0] + 2);
474 error("unknown switch `%c'", *ctx.opt);
476 usage_with_options(usagestr, options);
479 precompose_argv(argc, argv);
480 return parse_options_end(&ctx);
483 static int usage_argh(const struct option *opts, FILE *outfile)
486 int literal = (opts->flags & PARSE_OPT_LITERAL_ARGHELP) || !opts->argh;
487 if (opts->flags & PARSE_OPT_OPTARG)
489 s = literal ? "[=%s]" : "[=<%s>]";
491 s = literal ? "[%s]" : "[<%s>]";
493 s = literal ? " %s" : " <%s>";
494 return fprintf(outfile, s, opts->argh ? _(opts->argh) : _("..."));
497 #define USAGE_OPTS_WIDTH 24
500 static int usage_with_options_internal(struct parse_opt_ctx_t *ctx,
501 const char * const *usagestr,
502 const struct option *opts, int full, int err)
504 FILE *outfile = err ? stderr : stdout;
507 return PARSE_OPT_HELP;
509 if (!err && ctx && ctx->flags & PARSE_OPT_SHELL_EVAL)
510 fprintf(outfile, "cat <<\\EOF\n");
512 fprintf_ln(outfile, _("usage: %s"), _(*usagestr++));
513 while (*usagestr && **usagestr)
514 /* TRANSLATORS: the colon here should align with the
515 one in "usage: %s" translation */
516 fprintf_ln(outfile, _(" or: %s"), _(*usagestr++));
519 fprintf_ln(outfile, _(" %s"), _(*usagestr));
525 if (opts->type != OPTION_GROUP)
526 fputc('\n', outfile);
528 for (; opts->type != OPTION_END; opts++) {
532 if (opts->type == OPTION_GROUP) {
533 fputc('\n', outfile);
535 fprintf(outfile, "%s\n", _(opts->help));
538 if (!full && (opts->flags & PARSE_OPT_HIDDEN))
541 pos = fprintf(outfile, " ");
542 if (opts->short_name) {
543 if (opts->flags & PARSE_OPT_NODASH)
544 pos += fprintf(outfile, "%c", opts->short_name);
546 pos += fprintf(outfile, "-%c", opts->short_name);
548 if (opts->long_name && opts->short_name)
549 pos += fprintf(outfile, ", ");
551 pos += fprintf(outfile, "--%s", opts->long_name);
552 if (opts->type == OPTION_NUMBER)
553 pos += fprintf(outfile, "-NUM");
555 if ((opts->flags & PARSE_OPT_LITERAL_ARGHELP) ||
556 !(opts->flags & PARSE_OPT_NOARG))
557 pos += usage_argh(opts, outfile);
559 if (pos <= USAGE_OPTS_WIDTH)
560 pad = USAGE_OPTS_WIDTH - pos;
562 fputc('\n', outfile);
563 pad = USAGE_OPTS_WIDTH;
565 fprintf(outfile, "%*s%s\n", pad + USAGE_GAP, "", _(opts->help));
567 fputc('\n', outfile);
569 if (!err && ctx && ctx->flags & PARSE_OPT_SHELL_EVAL)
570 fputs("EOF\n", outfile);
572 return PARSE_OPT_HELP;
575 void NORETURN usage_with_options(const char * const *usagestr,
576 const struct option *opts)
578 usage_with_options_internal(NULL, usagestr, opts, 0, 1);
582 void NORETURN usage_msg_opt(const char *msg,
583 const char * const *usagestr,
584 const struct option *options)
586 fprintf(stderr, "%s\n\n", msg);
587 usage_with_options(usagestr, options);
590 static int parse_options_usage(struct parse_opt_ctx_t *ctx,
591 const char * const *usagestr,
592 const struct option *opts, int err)
594 return usage_with_options_internal(ctx, usagestr, opts, 0, err);