Merge branch 'lt/unpack-trees'
[git/git.git] / parse-options.c
1 #include "git-compat-util.h"
2 #include "parse-options.h"
3
4 #define OPT_SHORT 1
5 #define OPT_UNSET 2
6
7 struct optparse_t {
8 const char **argv;
9 const char **out;
10 int argc, cpidx;
11 const char *opt;
12 };
13
14 static inline const char *get_arg(struct optparse_t *p)
15 {
16 if (p->opt) {
17 const char *res = p->opt;
18 p->opt = NULL;
19 return res;
20 }
21 p->argc--;
22 return *++p->argv;
23 }
24
25 static inline const char *skip_prefix(const char *str, const char *prefix)
26 {
27 size_t len = strlen(prefix);
28 return strncmp(str, prefix, len) ? NULL : str + len;
29 }
30
31 static int opterror(const struct option *opt, const char *reason, int flags)
32 {
33 if (flags & OPT_SHORT)
34 return error("switch `%c' %s", opt->short_name, reason);
35 if (flags & OPT_UNSET)
36 return error("option `no-%s' %s", opt->long_name, reason);
37 return error("option `%s' %s", opt->long_name, reason);
38 }
39
40 static int get_value(struct optparse_t *p,
41 const struct option *opt, int flags)
42 {
43 const char *s, *arg;
44 const int unset = flags & OPT_UNSET;
45
46 if (unset && p->opt)
47 return opterror(opt, "takes no value", flags);
48 if (unset && (opt->flags & PARSE_OPT_NONEG))
49 return opterror(opt, "isn't available", flags);
50
51 if (!(flags & OPT_SHORT) && p->opt) {
52 switch (opt->type) {
53 case OPTION_CALLBACK:
54 if (!(opt->flags & PARSE_OPT_NOARG))
55 break;
56 /* FALLTHROUGH */
57 case OPTION_BOOLEAN:
58 case OPTION_BIT:
59 case OPTION_SET_INT:
60 case OPTION_SET_PTR:
61 return opterror(opt, "takes no value", flags);
62 default:
63 break;
64 }
65 }
66
67 arg = p->opt ? p->opt : (p->argc > 1 ? p->argv[1] : NULL);
68 switch (opt->type) {
69 case OPTION_BIT:
70 if (unset)
71 *(int *)opt->value &= ~opt->defval;
72 else
73 *(int *)opt->value |= opt->defval;
74 return 0;
75
76 case OPTION_BOOLEAN:
77 *(int *)opt->value = unset ? 0 : *(int *)opt->value + 1;
78 return 0;
79
80 case OPTION_SET_INT:
81 *(int *)opt->value = unset ? 0 : opt->defval;
82 return 0;
83
84 case OPTION_SET_PTR:
85 *(void **)opt->value = unset ? NULL : (void *)opt->defval;
86 return 0;
87
88 case OPTION_STRING:
89 if (unset) {
90 *(const char **)opt->value = NULL;
91 return 0;
92 }
93 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
94 *(const char **)opt->value = (const char *)opt->defval;
95 return 0;
96 }
97 if (!arg)
98 return opterror(opt, "requires a value", flags);
99 *(const char **)opt->value = get_arg(p);
100 return 0;
101
102 case OPTION_CALLBACK:
103 if (unset)
104 return (*opt->callback)(opt, NULL, 1);
105 if (opt->flags & PARSE_OPT_NOARG)
106 return (*opt->callback)(opt, NULL, 0);
107 if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
108 return (*opt->callback)(opt, NULL, 0);
109 if (!arg)
110 return opterror(opt, "requires a value", flags);
111 return (*opt->callback)(opt, get_arg(p), 0);
112
113 case OPTION_INTEGER:
114 if (unset) {
115 *(int *)opt->value = 0;
116 return 0;
117 }
118 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
119 *(int *)opt->value = opt->defval;
120 return 0;
121 }
122 if (!arg)
123 return opterror(opt, "requires a value", flags);
124 *(int *)opt->value = strtol(get_arg(p), (char **)&s, 10);
125 if (*s)
126 return opterror(opt, "expects a numerical value", flags);
127 return 0;
128
129 default:
130 die("should not happen, someone must be hit on the forehead");
131 }
132 }
133
134 static int parse_short_opt(struct optparse_t *p, const struct option *options)
135 {
136 for (; options->type != OPTION_END; options++) {
137 if (options->short_name == *p->opt) {
138 p->opt = p->opt[1] ? p->opt + 1 : NULL;
139 return get_value(p, options, OPT_SHORT);
140 }
141 }
142 return error("unknown switch `%c'", *p->opt);
143 }
144
145 static int parse_long_opt(struct optparse_t *p, const char *arg,
146 const struct option *options)
147 {
148 const char *arg_end = strchr(arg, '=');
149 const struct option *abbrev_option = NULL, *ambiguous_option = NULL;
150 int abbrev_flags = 0, ambiguous_flags = 0;
151
152 if (!arg_end)
153 arg_end = arg + strlen(arg);
154
155 for (; options->type != OPTION_END; options++) {
156 const char *rest;
157 int flags = 0;
158
159 if (!options->long_name)
160 continue;
161
162 rest = skip_prefix(arg, options->long_name);
163 if (options->type == OPTION_ARGUMENT) {
164 if (!rest)
165 continue;
166 if (*rest == '=')
167 return opterror(options, "takes no value", flags);
168 if (*rest)
169 continue;
170 p->out[p->cpidx++] = arg - 2;
171 return 0;
172 }
173 if (!rest) {
174 /* abbreviated? */
175 if (!strncmp(options->long_name, arg, arg_end - arg)) {
176 is_abbreviated:
177 if (abbrev_option) {
178 /*
179 * If this is abbreviated, it is
180 * ambiguous. So when there is no
181 * exact match later, we need to
182 * error out.
183 */
184 ambiguous_option = abbrev_option;
185 ambiguous_flags = abbrev_flags;
186 }
187 if (!(flags & OPT_UNSET) && *arg_end)
188 p->opt = arg_end + 1;
189 abbrev_option = options;
190 abbrev_flags = flags;
191 continue;
192 }
193 /* negated and abbreviated very much? */
194 if (!prefixcmp("no-", arg)) {
195 flags |= OPT_UNSET;
196 goto is_abbreviated;
197 }
198 /* negated? */
199 if (strncmp(arg, "no-", 3))
200 continue;
201 flags |= OPT_UNSET;
202 rest = skip_prefix(arg + 3, options->long_name);
203 /* abbreviated and negated? */
204 if (!rest && !prefixcmp(options->long_name, arg + 3))
205 goto is_abbreviated;
206 if (!rest)
207 continue;
208 }
209 if (*rest) {
210 if (*rest != '=')
211 continue;
212 p->opt = rest + 1;
213 }
214 return get_value(p, options, flags);
215 }
216
217 if (ambiguous_option)
218 return error("Ambiguous option: %s "
219 "(could be --%s%s or --%s%s)",
220 arg,
221 (ambiguous_flags & OPT_UNSET) ? "no-" : "",
222 ambiguous_option->long_name,
223 (abbrev_flags & OPT_UNSET) ? "no-" : "",
224 abbrev_option->long_name);
225 if (abbrev_option)
226 return get_value(p, abbrev_option, abbrev_flags);
227 return error("unknown option `%s'", arg);
228 }
229
230 void check_typos(const char *arg, const struct option *options)
231 {
232 if (strlen(arg) < 3)
233 return;
234
235 if (!prefixcmp(arg, "no-")) {
236 error ("did you mean `--%s` (with two dashes ?)", arg);
237 exit(129);
238 }
239
240 for (; options->type != OPTION_END; options++) {
241 if (!options->long_name)
242 continue;
243 if (!prefixcmp(options->long_name, arg)) {
244 error ("did you mean `--%s` (with two dashes ?)", arg);
245 exit(129);
246 }
247 }
248 }
249
250 static NORETURN void usage_with_options_internal(const char * const *,
251 const struct option *, int);
252
253 int parse_options(int argc, const char **argv, const struct option *options,
254 const char * const usagestr[], int flags)
255 {
256 struct optparse_t args = { argv + 1, argv, argc - 1, 0, NULL };
257
258 for (; args.argc; args.argc--, args.argv++) {
259 const char *arg = args.argv[0];
260
261 if (*arg != '-' || !arg[1]) {
262 args.out[args.cpidx++] = args.argv[0];
263 continue;
264 }
265
266 if (arg[1] != '-') {
267 args.opt = arg + 1;
268 if (*args.opt == 'h')
269 usage_with_options(usagestr, options);
270 if (parse_short_opt(&args, options) < 0)
271 usage_with_options(usagestr, options);
272 if (args.opt)
273 check_typos(arg + 1, options);
274 while (args.opt) {
275 if (*args.opt == 'h')
276 usage_with_options(usagestr, options);
277 if (parse_short_opt(&args, options) < 0)
278 usage_with_options(usagestr, options);
279 }
280 continue;
281 }
282
283 if (!arg[2]) { /* "--" */
284 if (!(flags & PARSE_OPT_KEEP_DASHDASH)) {
285 args.argc--;
286 args.argv++;
287 }
288 break;
289 }
290
291 if (!strcmp(arg + 2, "help-all"))
292 usage_with_options_internal(usagestr, options, 1);
293 if (!strcmp(arg + 2, "help"))
294 usage_with_options(usagestr, options);
295 if (parse_long_opt(&args, arg + 2, options))
296 usage_with_options(usagestr, options);
297 }
298
299 memmove(args.out + args.cpidx, args.argv, args.argc * sizeof(*args.out));
300 args.out[args.cpidx + args.argc] = NULL;
301 return args.cpidx + args.argc;
302 }
303
304 #define USAGE_OPTS_WIDTH 24
305 #define USAGE_GAP 2
306
307 void usage_with_options_internal(const char * const *usagestr,
308 const struct option *opts, int full)
309 {
310 fprintf(stderr, "usage: %s\n", *usagestr++);
311 while (*usagestr && **usagestr)
312 fprintf(stderr, " or: %s\n", *usagestr++);
313 while (*usagestr)
314 fprintf(stderr, " %s\n", *usagestr++);
315
316 if (opts->type != OPTION_GROUP)
317 fputc('\n', stderr);
318
319 for (; opts->type != OPTION_END; opts++) {
320 size_t pos;
321 int pad;
322
323 if (opts->type == OPTION_GROUP) {
324 fputc('\n', stderr);
325 if (*opts->help)
326 fprintf(stderr, "%s\n", opts->help);
327 continue;
328 }
329 if (!full && (opts->flags & PARSE_OPT_HIDDEN))
330 continue;
331
332 pos = fprintf(stderr, " ");
333 if (opts->short_name)
334 pos += fprintf(stderr, "-%c", opts->short_name);
335 if (opts->long_name && opts->short_name)
336 pos += fprintf(stderr, ", ");
337 if (opts->long_name)
338 pos += fprintf(stderr, "--%s", opts->long_name);
339
340 switch (opts->type) {
341 case OPTION_ARGUMENT:
342 break;
343 case OPTION_INTEGER:
344 if (opts->flags & PARSE_OPT_OPTARG)
345 pos += fprintf(stderr, " [<n>]");
346 else
347 pos += fprintf(stderr, " <n>");
348 break;
349 case OPTION_CALLBACK:
350 if (opts->flags & PARSE_OPT_NOARG)
351 break;
352 /* FALLTHROUGH */
353 case OPTION_STRING:
354 if (opts->argh) {
355 if (opts->flags & PARSE_OPT_OPTARG)
356 pos += fprintf(stderr, " [<%s>]", opts->argh);
357 else
358 pos += fprintf(stderr, " <%s>", opts->argh);
359 } else {
360 if (opts->flags & PARSE_OPT_OPTARG)
361 pos += fprintf(stderr, " [...]");
362 else
363 pos += fprintf(stderr, " ...");
364 }
365 break;
366 default: /* OPTION_{BIT,BOOLEAN,SET_INT,SET_PTR} */
367 break;
368 }
369
370 if (pos <= USAGE_OPTS_WIDTH)
371 pad = USAGE_OPTS_WIDTH - pos;
372 else {
373 fputc('\n', stderr);
374 pad = USAGE_OPTS_WIDTH;
375 }
376 fprintf(stderr, "%*s%s\n", pad + USAGE_GAP, "", opts->help);
377 }
378 fputc('\n', stderr);
379
380 exit(129);
381 }
382
383 void usage_with_options(const char * const *usagestr,
384 const struct option *opts)
385 {
386 usage_with_options_internal(usagestr, opts, 0);
387 }
388
389 /*----- some often used options -----*/
390 #include "cache.h"
391
392 int parse_opt_abbrev_cb(const struct option *opt, const char *arg, int unset)
393 {
394 int v;
395
396 if (!arg) {
397 v = unset ? 0 : DEFAULT_ABBREV;
398 } else {
399 v = strtol(arg, (char **)&arg, 10);
400 if (*arg)
401 return opterror(opt, "expects a numerical value", 0);
402 if (v && v < MINIMUM_ABBREV)
403 v = MINIMUM_ABBREV;
404 else if (v > 40)
405 v = 40;
406 }
407 *(int *)(opt->value) = v;
408 return 0;
409 }