documentation: use clearer prepositions
[alt-git.git] / parse-options.h
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1 #ifndef PARSE_OPTIONS_H
2 #define PARSE_OPTIONS_H
4 #include "gettext.h"
6 /**
7 * Refer to Documentation/technical/api-parse-options.txt for the API doc.
8 */
10 enum parse_opt_type {
11 /* special types */
12 OPTION_END,
13 OPTION_GROUP,
14 OPTION_NUMBER,
15 OPTION_ALIAS,
16 OPTION_SUBCOMMAND,
17 /* options with no arguments */
18 OPTION_BIT,
19 OPTION_NEGBIT,
20 OPTION_BITOP,
21 OPTION_COUNTUP,
22 OPTION_SET_INT,
23 /* options with arguments (usually) */
24 OPTION_STRING,
25 OPTION_INTEGER,
26 OPTION_MAGNITUDE,
27 OPTION_CALLBACK,
28 OPTION_LOWLEVEL_CALLBACK,
29 OPTION_FILENAME
32 enum parse_opt_flags {
33 PARSE_OPT_KEEP_DASHDASH = 1 << 0,
34 PARSE_OPT_STOP_AT_NON_OPTION = 1 << 1,
35 PARSE_OPT_KEEP_ARGV0 = 1 << 2,
36 PARSE_OPT_KEEP_UNKNOWN_OPT = 1 << 3,
37 PARSE_OPT_NO_INTERNAL_HELP = 1 << 4,
38 PARSE_OPT_ONE_SHOT = 1 << 5,
39 PARSE_OPT_SHELL_EVAL = 1 << 6,
40 PARSE_OPT_SUBCOMMAND_OPTIONAL = 1 << 7,
43 enum parse_opt_option_flags {
44 PARSE_OPT_OPTARG = 1 << 0,
45 PARSE_OPT_NOARG = 1 << 1,
46 PARSE_OPT_NONEG = 1 << 2,
47 PARSE_OPT_HIDDEN = 1 << 3,
48 PARSE_OPT_LASTARG_DEFAULT = 1 << 4,
49 PARSE_OPT_NODASH = 1 << 5,
50 PARSE_OPT_LITERAL_ARGHELP = 1 << 6,
51 PARSE_OPT_FROM_ALIAS = 1 << 7,
52 PARSE_OPT_NOCOMPLETE = 1 << 9,
53 PARSE_OPT_COMP_ARG = 1 << 10,
54 PARSE_OPT_CMDMODE = 1 << 11,
57 enum parse_opt_result {
58 PARSE_OPT_COMPLETE = -3,
59 PARSE_OPT_HELP = -2,
60 PARSE_OPT_ERROR = -1, /* must be the same as error() */
61 PARSE_OPT_DONE = 0, /* fixed so that "return 0" works */
62 PARSE_OPT_NON_OPTION,
63 PARSE_OPT_SUBCOMMAND,
64 PARSE_OPT_UNKNOWN
67 struct option;
68 typedef int parse_opt_cb(const struct option *, const char *arg, int unset);
70 struct parse_opt_ctx_t;
71 typedef enum parse_opt_result parse_opt_ll_cb(struct parse_opt_ctx_t *ctx,
72 const struct option *opt,
73 const char *arg, int unset);
75 typedef int parse_opt_subcommand_fn(int argc, const char **argv,
76 const char *prefix);
79 * `type`::
80 * holds the type of the option, you must have an OPTION_END last in your
81 * array.
83 * `short_name`::
84 * the character to use as a short option name, '\0' if none.
86 * `long_name`::
87 * the long option (without the leading dashes) or subcommand name,
88 * NULL if none.
90 * `value`::
91 * stores pointers to the values to be filled.
93 * `argh`::
94 * token to explain the kind of argument this option wants. Does not
95 * begin in capital letter, and does not end with a full stop.
96 * Should be wrapped by N_() for translation.
97 * Is automatically enclosed in brackets when printed, unless it
98 * contains any of the following characters: ()<>[]|
99 * E.g. "name" is shown as "<name>" to indicate that a name value
100 * needs to be supplied, not the literal string "name", but
101 * "<start>,<end>" and "(this|that)" are printed verbatim.
103 * `help`::
104 * the short help associated to what the option does.
105 * Must never be NULL (except for OPTION_END and OPTION_SUBCOMMAND).
106 * OPTION_GROUP uses this pointer to store the group header.
107 * Should be wrapped by N_() for translation.
109 * `flags`::
110 * mask of parse_opt_option_flags.
111 * PARSE_OPT_OPTARG: says that the argument is optional (not for BOOLEANs)
112 * PARSE_OPT_NOARG: says that this option does not take an argument
113 * PARSE_OPT_NONEG: says that this option cannot be negated
114 * PARSE_OPT_HIDDEN: this option is skipped in the default usage, and
115 * shown only in the full usage.
116 * PARSE_OPT_LASTARG_DEFAULT: says that this option will take the default
117 * value if no argument is given when the option
118 * is last on the command line. If the option is
119 * not last it will require an argument.
120 * Should not be used with PARSE_OPT_OPTARG.
121 * PARSE_OPT_NODASH: this option doesn't start with a dash; can only be a
122 * short option and can't accept arguments.
123 * PARSE_OPT_LITERAL_ARGHELP: says that argh shouldn't be enclosed in brackets
124 * (i.e. '<argh>') in the help message.
125 * Useful for options with multiple parameters.
126 * PARSE_OPT_NOCOMPLETE: by default all visible options are completable
127 * by git-completion.bash. This option suppresses that.
128 * PARSE_OPT_COMP_ARG: this option forces to git-completion.bash to
129 * complete an option as --name= not --name even if
130 * the option takes optional argument.
132 * `callback`::
133 * pointer to the callback to use for OPTION_CALLBACK
135 * `defval`::
136 * default value to fill (*->value) with for PARSE_OPT_OPTARG.
137 * OPTION_{BIT,SET_INT} store the {mask,integer} to put in the value when met.
138 * CALLBACKS can use it like they want.
140 * `ll_callback`::
141 * pointer to the callback to use for OPTION_LOWLEVEL_CALLBACK
143 * `subcommand_fn`::
144 * pointer to a function to use for OPTION_SUBCOMMAND.
145 * It will be put in value when the subcommand is given on the command line.
147 struct option {
148 enum parse_opt_type type;
149 int short_name;
150 const char *long_name;
151 void *value;
152 const char *argh;
153 const char *help;
155 enum parse_opt_option_flags flags;
156 parse_opt_cb *callback;
157 intptr_t defval;
158 parse_opt_ll_cb *ll_callback;
159 intptr_t extra;
160 parse_opt_subcommand_fn *subcommand_fn;
163 #define OPT_BIT_F(s, l, v, h, b, f) { \
164 .type = OPTION_BIT, \
165 .short_name = (s), \
166 .long_name = (l), \
167 .value = (v), \
168 .help = (h), \
169 .flags = PARSE_OPT_NOARG|(f), \
170 .callback = NULL, \
171 .defval = (b), \
173 #define OPT_COUNTUP_F(s, l, v, h, f) { \
174 .type = OPTION_COUNTUP, \
175 .short_name = (s), \
176 .long_name = (l), \
177 .value = (v), \
178 .help = (h), \
179 .flags = PARSE_OPT_NOARG|(f), \
181 #define OPT_SET_INT_F(s, l, v, h, i, f) { \
182 .type = OPTION_SET_INT, \
183 .short_name = (s), \
184 .long_name = (l), \
185 .value = (v), \
186 .help = (h), \
187 .flags = PARSE_OPT_NOARG | (f), \
188 .defval = (i), \
190 #define OPT_BOOL_F(s, l, v, h, f) OPT_SET_INT_F(s, l, v, h, 1, f)
191 #define OPT_CALLBACK_F(s, l, v, a, h, f, cb) { \
192 .type = OPTION_CALLBACK, \
193 .short_name = (s), \
194 .long_name = (l), \
195 .value = (v), \
196 .argh = (a), \
197 .help = (h), \
198 .flags = (f), \
199 .callback = (cb), \
201 #define OPT_STRING_F(s, l, v, a, h, f) { \
202 .type = OPTION_STRING, \
203 .short_name = (s), \
204 .long_name = (l), \
205 .value = (v), \
206 .argh = (a), \
207 .help = (h), \
208 .flags = (f), \
210 #define OPT_INTEGER_F(s, l, v, h, f) { \
211 .type = OPTION_INTEGER, \
212 .short_name = (s), \
213 .long_name = (l), \
214 .value = (v), \
215 .argh = N_("n"), \
216 .help = (h), \
217 .flags = (f), \
220 #define OPT_END() { \
221 .type = OPTION_END, \
223 #define OPT_GROUP(h) { \
224 .type = OPTION_GROUP, \
225 .help = (h), \
227 #define OPT_BIT(s, l, v, h, b) OPT_BIT_F(s, l, v, h, b, 0)
228 #define OPT_BITOP(s, l, v, h, set, clear) { \
229 .type = OPTION_BITOP, \
230 .short_name = (s), \
231 .long_name = (l), \
232 .value = (v), \
233 .help = (h), \
234 .flags = PARSE_OPT_NOARG|PARSE_OPT_NONEG, \
235 .defval = (set), \
236 .extra = (clear), \
238 #define OPT_NEGBIT(s, l, v, h, b) { \
239 .type = OPTION_NEGBIT, \
240 .short_name = (s), \
241 .long_name = (l), \
242 .value = (v), \
243 .help = (h), \
244 .flags = PARSE_OPT_NOARG, \
245 .defval = (b), \
247 #define OPT_COUNTUP(s, l, v, h) OPT_COUNTUP_F(s, l, v, h, 0)
248 #define OPT_SET_INT(s, l, v, h, i) OPT_SET_INT_F(s, l, v, h, i, 0)
249 #define OPT_BOOL(s, l, v, h) OPT_BOOL_F(s, l, v, h, 0)
250 #define OPT_HIDDEN_BOOL(s, l, v, h) { \
251 .type = OPTION_SET_INT, \
252 .short_name = (s), \
253 .long_name = (l), \
254 .value = (v), \
255 .help = (h), \
256 .flags = PARSE_OPT_NOARG | PARSE_OPT_HIDDEN, \
257 .defval = 1, \
259 #define OPT_CMDMODE_F(s, l, v, h, i, f) { \
260 .type = OPTION_SET_INT, \
261 .short_name = (s), \
262 .long_name = (l), \
263 .value = (v), \
264 .help = (h), \
265 .flags = PARSE_OPT_CMDMODE|PARSE_OPT_NOARG|PARSE_OPT_NONEG | (f), \
266 .defval = (i), \
268 #define OPT_CMDMODE(s, l, v, h, i) OPT_CMDMODE_F(s, l, v, h, i, 0)
270 #define OPT_INTEGER(s, l, v, h) OPT_INTEGER_F(s, l, v, h, 0)
271 #define OPT_MAGNITUDE(s, l, v, h) { \
272 .type = OPTION_MAGNITUDE, \
273 .short_name = (s), \
274 .long_name = (l), \
275 .value = (v), \
276 .argh = N_("n"), \
277 .help = (h), \
278 .flags = PARSE_OPT_NONEG, \
280 #define OPT_STRING(s, l, v, a, h) OPT_STRING_F(s, l, v, a, h, 0)
281 #define OPT_STRING_LIST(s, l, v, a, h) { \
282 .type = OPTION_CALLBACK, \
283 .short_name = (s), \
284 .long_name = (l), \
285 .value = (v), \
286 .argh = (a), \
287 .help = (h), \
288 .callback = &parse_opt_string_list, \
290 #define OPT_STRVEC(s, l, v, a, h) { \
291 .type = OPTION_CALLBACK, \
292 .short_name = (s), \
293 .long_name = (l), \
294 .value = (v), \
295 .argh = (a), \
296 .help = (h), \
297 .callback = &parse_opt_strvec, \
299 #define OPT_UYN(s, l, v, h) { \
300 .type = OPTION_CALLBACK, \
301 .short_name = (s), \
302 .long_name = (l), \
303 .value = (v), \
304 .help = (h), \
305 .flags = PARSE_OPT_NOARG, \
306 .callback = &parse_opt_tertiary, \
308 #define OPT_EXPIRY_DATE(s, l, v, h) { \
309 .type = OPTION_CALLBACK, \
310 .short_name = (s), \
311 .long_name = (l), \
312 .value = (v), \
313 .argh = N_("expiry-date"), \
314 .help = (h), \
315 .callback = parse_opt_expiry_date_cb, \
317 #define OPT_CALLBACK(s, l, v, a, h, cb) OPT_CALLBACK_F(s, l, v, a, h, 0, cb)
318 #define OPT_NUMBER_CALLBACK(v, h, cb) { \
319 .type = OPTION_NUMBER, \
320 .value = (v), \
321 .help = (h), \
322 .flags = PARSE_OPT_NOARG | PARSE_OPT_NONEG, \
323 .callback = (cb), \
325 #define OPT_FILENAME(s, l, v, h) { \
326 .type = OPTION_FILENAME, \
327 .short_name = (s), \
328 .long_name = (l), \
329 .value = (v), \
330 .argh = N_("file"), \
331 .help = (h), \
333 #define OPT_COLOR_FLAG(s, l, v, h) { \
334 .type = OPTION_CALLBACK, \
335 .short_name = (s), \
336 .long_name = (l), \
337 .value = (v), \
338 .argh = N_("when"), \
339 .help = (h), \
340 .flags = PARSE_OPT_OPTARG, \
341 .callback = parse_opt_color_flag_cb, \
342 .defval = (intptr_t)"always", \
345 #define OPT_NOOP_NOARG(s, l) { \
346 .type = OPTION_CALLBACK, \
347 .short_name = (s), \
348 .long_name = (l), \
349 .help = N_("no-op (backward compatibility)"), \
350 .flags = PARSE_OPT_HIDDEN | PARSE_OPT_NOARG, \
351 .callback = parse_opt_noop_cb, \
354 #define OPT_ALIAS(s, l, source_long_name) { \
355 .type = OPTION_ALIAS, \
356 .short_name = (s), \
357 .long_name = (l), \
358 .value = (source_long_name), \
361 #define OPT_SUBCOMMAND_F(l, v, fn, f) { \
362 .type = OPTION_SUBCOMMAND, \
363 .long_name = (l), \
364 .value = (v), \
365 .flags = (f), \
366 .subcommand_fn = (fn), \
368 #define OPT_SUBCOMMAND(l, v, fn) OPT_SUBCOMMAND_F((l), (v), (fn), 0)
371 * parse_options() will filter out the processed options and leave the
372 * non-option arguments in argv[]. argv0 is assumed program name and
373 * skipped.
375 * usagestr strings should be marked for translation with N_().
377 * Returns the number of arguments left in argv[].
379 * In one-shot mode, argv0 is not a program name, argv[] is left
380 * untouched and parse_options() returns the number of options
381 * processed.
383 int parse_options(int argc, const char **argv, const char *prefix,
384 const struct option *options,
385 const char * const usagestr[],
386 enum parse_opt_flags flags);
388 NORETURN void usage_with_options(const char * const *usagestr,
389 const struct option *options);
391 NORETURN void usage_msg_opt(const char *msg,
392 const char * const *usagestr,
393 const struct option *options);
396 * usage_msg_optf() is like usage_msg_opt() except that the first
397 * argument is a format string, and optional format arguments follow
398 * after the 3rd option.
400 __attribute__((format (printf,1,4)))
401 void NORETURN usage_msg_optf(const char *fmt,
402 const char * const *usagestr,
403 const struct option *options, ...);
405 void die_for_incompatible_opt4(int opt1, const char *opt1_name,
406 int opt2, const char *opt2_name,
407 int opt3, const char *opt3_name,
408 int opt4, const char *opt4_name);
411 static inline void die_for_incompatible_opt3(int opt1, const char *opt1_name,
412 int opt2, const char *opt2_name,
413 int opt3, const char *opt3_name)
415 die_for_incompatible_opt4(opt1, opt1_name,
416 opt2, opt2_name,
417 opt3, opt3_name,
418 0, "");
422 * Use these assertions for callbacks that expect to be called with NONEG and
423 * NOARG respectively, and do not otherwise handle the "unset" and "arg"
424 * parameters.
426 #define BUG_ON_OPT_NEG(unset) do { \
427 if ((unset)) \
428 BUG("option callback does not expect negation"); \
429 } while (0)
430 #define BUG_ON_OPT_ARG(arg) do { \
431 if ((arg)) \
432 BUG("option callback does not expect an argument"); \
433 } while (0)
436 * Similar to the assertions above, but checks that "arg" is always non-NULL.
437 * This assertion also implies BUG_ON_OPT_NEG(), letting you declare both
438 * assertions in a single line.
440 #define BUG_ON_OPT_NEG_NOARG(unset, arg) do { \
441 BUG_ON_OPT_NEG(unset); \
442 if(!(arg)) \
443 BUG("option callback expects an argument"); \
444 } while(0)
446 /*----- incremental advanced APIs -----*/
449 * It's okay for the caller to consume argv/argc in the usual way.
450 * Other fields of that structure are private to parse-options and should not
451 * be modified in any way.
453 struct parse_opt_ctx_t {
454 const char **argv;
455 const char **out;
456 int argc, cpidx, total;
457 const char *opt;
458 enum parse_opt_flags flags;
459 unsigned has_subcommands;
460 const char *prefix;
461 const char **alias_groups; /* must be in groups of 3 elements! */
462 struct option *updated_options;
465 void parse_options_start(struct parse_opt_ctx_t *ctx,
466 int argc, const char **argv, const char *prefix,
467 const struct option *options,
468 enum parse_opt_flags flags);
470 enum parse_opt_result parse_options_step(struct parse_opt_ctx_t *ctx,
471 const struct option *options,
472 const char * const usagestr[]);
474 int parse_options_end(struct parse_opt_ctx_t *ctx);
476 struct option *parse_options_dup(const struct option *a);
477 struct option *parse_options_concat(const struct option *a, const struct option *b);
479 /*----- some often used options -----*/
480 int parse_opt_abbrev_cb(const struct option *, const char *, int);
481 int parse_opt_expiry_date_cb(const struct option *, const char *, int);
482 int parse_opt_color_flag_cb(const struct option *, const char *, int);
483 int parse_opt_verbosity_cb(const struct option *, const char *, int);
484 /* value is struct oid_array* */
485 int parse_opt_object_name(const struct option *, const char *, int);
486 /* value is struct object_id* */
487 int parse_opt_object_id(const struct option *, const char *, int);
488 int parse_opt_commits(const struct option *, const char *, int);
489 int parse_opt_commit(const struct option *, const char *, int);
490 int parse_opt_tertiary(const struct option *, const char *, int);
491 int parse_opt_string_list(const struct option *, const char *, int);
492 int parse_opt_strvec(const struct option *, const char *, int);
493 int parse_opt_noop_cb(const struct option *, const char *, int);
494 int parse_opt_passthru(const struct option *, const char *, int);
495 int parse_opt_passthru_argv(const struct option *, const char *, int);
496 /* value is enum branch_track* */
497 int parse_opt_tracking_mode(const struct option *, const char *, int);
499 #define OPT__VERBOSE(var, h) OPT_COUNTUP('v', "verbose", (var), (h))
500 #define OPT__QUIET(var, h) OPT_COUNTUP('q', "quiet", (var), (h))
501 #define OPT__VERBOSITY(var) { \
502 .type = OPTION_CALLBACK, \
503 .short_name = 'v', \
504 .long_name = "verbose", \
505 .value = (var), \
506 .help = N_("be more verbose"), \
507 .flags = PARSE_OPT_NOARG, \
508 .callback = &parse_opt_verbosity_cb, \
509 }, { \
510 .type = OPTION_CALLBACK, \
511 .short_name = 'q', \
512 .long_name = "quiet", \
513 .value = (var), \
514 .help = N_("be more quiet"), \
515 .flags = PARSE_OPT_NOARG, \
516 .callback = &parse_opt_verbosity_cb, \
518 #define OPT__DRY_RUN(var, h) OPT_BOOL('n', "dry-run", (var), (h))
519 #define OPT__FORCE(var, h, f) OPT_COUNTUP_F('f', "force", (var), (h), (f))
520 #define OPT__ABBREV(var) { \
521 .type = OPTION_CALLBACK, \
522 .long_name = "abbrev", \
523 .value = (var), \
524 .argh = N_("n"), \
525 .help = N_("use <n> digits to display object names"), \
526 .flags = PARSE_OPT_OPTARG, \
527 .callback = &parse_opt_abbrev_cb, \
529 #define OPT__SUPER_PREFIX(var) \
530 OPT_STRING_F(0, "super-prefix", (var), N_("prefix"), \
531 N_("prefixed path to initial superproject"), PARSE_OPT_HIDDEN)
533 #define OPT__COLOR(var, h) \
534 OPT_COLOR_FLAG(0, "color", (var), (h))
535 #define OPT_COLUMN(s, l, v, h) { \
536 .type = OPTION_CALLBACK, \
537 .short_name = (s), \
538 .long_name = (l), \
539 .value = (v), \
540 .argh = N_("style"), \
541 .help = (h), \
542 .flags = PARSE_OPT_OPTARG, \
543 .callback = parseopt_column_callback, \
545 #define OPT_PASSTHRU(s, l, v, a, h, f) { \
546 .type = OPTION_CALLBACK, \
547 .short_name = (s), \
548 .long_name = (l), \
549 .value = (v), \
550 .argh = (a), \
551 .help = (h), \
552 .flags = (f), \
553 .callback = parse_opt_passthru, \
555 #define OPT_PASSTHRU_ARGV(s, l, v, a, h, f) { \
556 .type = OPTION_CALLBACK, \
557 .short_name = (s), \
558 .long_name = (l), \
559 .value = (v), \
560 .argh = (a), \
561 .help = (h), \
562 .flags = (f), \
563 .callback = parse_opt_passthru_argv, \
565 #define _OPT_CONTAINS_OR_WITH(l, v, h, f) { \
566 .type = OPTION_CALLBACK, \
567 .long_name = (l), \
568 .value = (v), \
569 .argh = N_("commit"), \
570 .help = (h), \
571 .flags = PARSE_OPT_LASTARG_DEFAULT | (f), \
572 .callback = parse_opt_commits, \
573 .defval = (intptr_t) "HEAD", \
575 #define OPT_CONTAINS(v, h) _OPT_CONTAINS_OR_WITH("contains", v, h, PARSE_OPT_NONEG)
576 #define OPT_NO_CONTAINS(v, h) _OPT_CONTAINS_OR_WITH("no-contains", v, h, PARSE_OPT_NONEG)
577 #define OPT_WITH(v, h) _OPT_CONTAINS_OR_WITH("with", v, h, PARSE_OPT_HIDDEN | PARSE_OPT_NONEG)
578 #define OPT_WITHOUT(v, h) _OPT_CONTAINS_OR_WITH("without", v, h, PARSE_OPT_HIDDEN | PARSE_OPT_NONEG)
579 #define OPT_CLEANUP(v) OPT_STRING(0, "cleanup", v, N_("mode"), N_("how to strip spaces and #comments from message"))
580 #define OPT_PATHSPEC_FROM_FILE(v) OPT_FILENAME(0, "pathspec-from-file", v, N_("read pathspec from file"))
581 #define OPT_PATHSPEC_FILE_NUL(v) OPT_BOOL(0, "pathspec-file-nul", v, N_("with --pathspec-from-file, pathspec elements are separated with NUL character"))
582 #define OPT_AUTOSTASH(v) OPT_BOOL(0, "autostash", v, N_("automatically stash/stash pop before and after"))
584 #define OPT_IPVERSION(v) \
585 OPT_SET_INT_F('4', "ipv4", (v), N_("use IPv4 addresses only"), \
586 TRANSPORT_FAMILY_IPV4, PARSE_OPT_NONEG), \
587 OPT_SET_INT_F('6', "ipv6", (v), N_("use IPv6 addresses only"), \
588 TRANSPORT_FAMILY_IPV6, PARSE_OPT_NONEG)
590 #endif