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[git/jr.git] / parse-options.c
blob7a08a0c64f9f447e09ef6771d83dbf95f8f3545d
1 #include "git-compat-util.h"
2 #include "parse-options.h"
4 #define OPT_SHORT 1
5 #define OPT_UNSET 2
7 struct optparse_t {
8 const char **argv;
9 int argc;
10 const char *opt;
13 static inline const char *get_arg(struct optparse_t *p)
15 if (p->opt) {
16 const char *res = p->opt;
17 p->opt = NULL;
18 return res;
20 p->argc--;
21 return *++p->argv;
24 static inline const char *skip_prefix(const char *str, const char *prefix)
26 size_t len = strlen(prefix);
27 return strncmp(str, prefix, len) ? NULL : str + len;
30 static int opterror(const struct option *opt, const char *reason, int flags)
32 if (flags & OPT_SHORT)
33 return error("switch `%c' %s", opt->short_name, reason);
34 if (flags & OPT_UNSET)
35 return error("option `no-%s' %s", opt->long_name, reason);
36 return error("option `%s' %s", opt->long_name, reason);
39 static int get_value(struct optparse_t *p,
40 const struct option *opt, int flags)
42 const char *s, *arg;
43 const int unset = flags & OPT_UNSET;
45 if (unset && p->opt)
46 return opterror(opt, "takes no value", flags);
47 if (unset && (opt->flags & PARSE_OPT_NONEG))
48 return opterror(opt, "isn't available", flags);
50 if (!(flags & OPT_SHORT) && p->opt) {
51 switch (opt->type) {
52 case OPTION_CALLBACK:
53 if (!(opt->flags & PARSE_OPT_NOARG))
54 break;
55 /* FALLTHROUGH */
56 case OPTION_BOOLEAN:
57 case OPTION_BIT:
58 case OPTION_SET_INT:
59 case OPTION_SET_PTR:
60 return opterror(opt, "takes no value", flags);
61 default:
62 break;
66 arg = p->opt ? p->opt : (p->argc > 1 ? p->argv[1] : NULL);
67 switch (opt->type) {
68 case OPTION_BIT:
69 if (unset)
70 *(int *)opt->value &= ~opt->defval;
71 else
72 *(int *)opt->value |= opt->defval;
73 return 0;
75 case OPTION_BOOLEAN:
76 *(int *)opt->value = unset ? 0 : *(int *)opt->value + 1;
77 return 0;
79 case OPTION_SET_INT:
80 *(int *)opt->value = unset ? 0 : opt->defval;
81 return 0;
83 case OPTION_SET_PTR:
84 *(void **)opt->value = unset ? NULL : (void *)opt->defval;
85 return 0;
87 case OPTION_STRING:
88 if (unset) {
89 *(const char **)opt->value = NULL;
90 return 0;
92 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
93 *(const char **)opt->value = (const char *)opt->defval;
94 return 0;
96 if (!arg)
97 return opterror(opt, "requires a value", flags);
98 *(const char **)opt->value = get_arg(p);
99 return 0;
101 case OPTION_CALLBACK:
102 if (unset)
103 return (*opt->callback)(opt, NULL, 1);
104 if (opt->flags & PARSE_OPT_NOARG)
105 return (*opt->callback)(opt, NULL, 0);
106 if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
107 return (*opt->callback)(opt, NULL, 0);
108 if (!arg)
109 return opterror(opt, "requires a value", flags);
110 return (*opt->callback)(opt, get_arg(p), 0);
112 case OPTION_INTEGER:
113 if (unset) {
114 *(int *)opt->value = 0;
115 return 0;
117 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
118 *(int *)opt->value = opt->defval;
119 return 0;
121 if (!arg)
122 return opterror(opt, "requires a value", flags);
123 *(int *)opt->value = strtol(get_arg(p), (char **)&s, 10);
124 if (*s)
125 return opterror(opt, "expects a numerical value", flags);
126 return 0;
128 default:
129 die("should not happen, someone must be hit on the forehead");
133 static int parse_short_opt(struct optparse_t *p, const struct option *options)
135 for (; options->type != OPTION_END; options++) {
136 if (options->short_name == *p->opt) {
137 p->opt = p->opt[1] ? p->opt + 1 : NULL;
138 return get_value(p, options, OPT_SHORT);
141 return error("unknown switch `%c'", *p->opt);
144 static int parse_long_opt(struct optparse_t *p, const char *arg,
145 const struct option *options)
147 const char *arg_end = strchr(arg, '=');
148 const struct option *abbrev_option = NULL, *ambiguous_option = NULL;
149 int abbrev_flags = 0, ambiguous_flags = 0;
151 if (!arg_end)
152 arg_end = arg + strlen(arg);
154 for (; options->type != OPTION_END; options++) {
155 const char *rest;
156 int flags = 0;
158 if (!options->long_name)
159 continue;
161 rest = skip_prefix(arg, options->long_name);
162 if (!rest) {
163 /* abbreviated? */
164 if (!strncmp(options->long_name, arg, arg_end - arg)) {
165 is_abbreviated:
166 if (abbrev_option) {
168 * If this is abbreviated, it is
169 * ambiguous. So when there is no
170 * exact match later, we need to
171 * error out.
173 ambiguous_option = abbrev_option;
174 ambiguous_flags = abbrev_flags;
176 if (!(flags & OPT_UNSET) && *arg_end)
177 p->opt = arg_end + 1;
178 abbrev_option = options;
179 abbrev_flags = flags;
180 continue;
182 /* negated and abbreviated very much? */
183 if (!prefixcmp("no-", arg)) {
184 flags |= OPT_UNSET;
185 goto is_abbreviated;
187 /* negated? */
188 if (strncmp(arg, "no-", 3))
189 continue;
190 flags |= OPT_UNSET;
191 rest = skip_prefix(arg + 3, options->long_name);
192 /* abbreviated and negated? */
193 if (!rest && !prefixcmp(options->long_name, arg + 3))
194 goto is_abbreviated;
195 if (!rest)
196 continue;
198 if (*rest) {
199 if (*rest != '=')
200 continue;
201 p->opt = rest + 1;
203 return get_value(p, options, flags);
206 if (ambiguous_option)
207 return error("Ambiguous option: %s "
208 "(could be --%s%s or --%s%s)",
209 arg,
210 (ambiguous_flags & OPT_UNSET) ? "no-" : "",
211 ambiguous_option->long_name,
212 (abbrev_flags & OPT_UNSET) ? "no-" : "",
213 abbrev_option->long_name);
214 if (abbrev_option)
215 return get_value(p, abbrev_option, abbrev_flags);
216 return error("unknown option `%s'", arg);
219 static NORETURN void usage_with_options_internal(const char * const *,
220 const struct option *, int);
222 int parse_options(int argc, const char **argv, const struct option *options,
223 const char * const usagestr[], int flags)
225 struct optparse_t args = { argv + 1, argc - 1, NULL };
226 int j = 0;
228 for (; args.argc; args.argc--, args.argv++) {
229 const char *arg = args.argv[0];
231 if (*arg != '-' || !arg[1]) {
232 argv[j++] = args.argv[0];
233 continue;
236 if (arg[1] != '-') {
237 args.opt = arg + 1;
238 do {
239 if (*args.opt == 'h')
240 usage_with_options(usagestr, options);
241 if (parse_short_opt(&args, options) < 0)
242 usage_with_options(usagestr, options);
243 } while (args.opt);
244 continue;
247 if (!arg[2]) { /* "--" */
248 if (!(flags & PARSE_OPT_KEEP_DASHDASH)) {
249 args.argc--;
250 args.argv++;
252 break;
255 if (!strcmp(arg + 2, "help-all"))
256 usage_with_options_internal(usagestr, options, 1);
257 if (!strcmp(arg + 2, "help"))
258 usage_with_options(usagestr, options);
259 if (parse_long_opt(&args, arg + 2, options))
260 usage_with_options(usagestr, options);
263 memmove(argv + j, args.argv, args.argc * sizeof(*argv));
264 argv[j + args.argc] = NULL;
265 return j + args.argc;
268 #define USAGE_OPTS_WIDTH 24
269 #define USAGE_GAP 2
271 void usage_with_options_internal(const char * const *usagestr,
272 const struct option *opts, int full)
274 fprintf(stderr, "usage: %s\n", *usagestr++);
275 while (*usagestr && **usagestr)
276 fprintf(stderr, " or: %s\n", *usagestr++);
277 while (*usagestr)
278 fprintf(stderr, " %s\n", *usagestr++);
280 if (opts->type != OPTION_GROUP)
281 fputc('\n', stderr);
283 for (; opts->type != OPTION_END; opts++) {
284 size_t pos;
285 int pad;
287 if (opts->type == OPTION_GROUP) {
288 fputc('\n', stderr);
289 if (*opts->help)
290 fprintf(stderr, "%s\n", opts->help);
291 continue;
293 if (!full && (opts->flags & PARSE_OPT_HIDDEN))
294 continue;
296 pos = fprintf(stderr, " ");
297 if (opts->short_name)
298 pos += fprintf(stderr, "-%c", opts->short_name);
299 if (opts->long_name && opts->short_name)
300 pos += fprintf(stderr, ", ");
301 if (opts->long_name)
302 pos += fprintf(stderr, "--%s", opts->long_name);
304 switch (opts->type) {
305 case OPTION_INTEGER:
306 if (opts->flags & PARSE_OPT_OPTARG)
307 pos += fprintf(stderr, " [<n>]");
308 else
309 pos += fprintf(stderr, " <n>");
310 break;
311 case OPTION_CALLBACK:
312 if (opts->flags & PARSE_OPT_NOARG)
313 break;
314 /* FALLTHROUGH */
315 case OPTION_STRING:
316 if (opts->argh) {
317 if (opts->flags & PARSE_OPT_OPTARG)
318 pos += fprintf(stderr, " [<%s>]", opts->argh);
319 else
320 pos += fprintf(stderr, " <%s>", opts->argh);
321 } else {
322 if (opts->flags & PARSE_OPT_OPTARG)
323 pos += fprintf(stderr, " [...]");
324 else
325 pos += fprintf(stderr, " ...");
327 break;
328 default: /* OPTION_{BIT,BOOLEAN,SET_INT,SET_PTR} */
329 break;
332 if (pos <= USAGE_OPTS_WIDTH)
333 pad = USAGE_OPTS_WIDTH - pos;
334 else {
335 fputc('\n', stderr);
336 pad = USAGE_OPTS_WIDTH;
338 fprintf(stderr, "%*s%s\n", pad + USAGE_GAP, "", opts->help);
340 fputc('\n', stderr);
342 exit(129);
345 void usage_with_options(const char * const *usagestr,
346 const struct option *opts)
348 usage_with_options_internal(usagestr, opts, 0);
351 /*----- some often used options -----*/
352 #include "cache.h"
354 int parse_opt_abbrev_cb(const struct option *opt, const char *arg, int unset)
356 int v;
358 if (!arg) {
359 v = unset ? 0 : DEFAULT_ABBREV;
360 } else {
361 v = strtol(arg, (char **)&arg, 10);
362 if (*arg)
363 return opterror(opt, "expects a numerical value", 0);
364 if (v && v < MINIMUM_ABBREV)
365 v = MINIMUM_ABBREV;
366 else if (v > 40)
367 v = 40;
369 *(int *)(opt->value) = v;
370 return 0;