1 #include "git-compat-util.h"
2 #include "parse-options.h"
13 static inline const char *get_arg(struct optparse_t *p)
16 const char *res = p->opt;
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)
43 arg = p->opt ? p->opt : (p->argc > 1 ? p->argv[1] : NULL);
45 if (p->opt && (flags & OPT_UNSET))
46 return opterror(opt, "takes no value", flags);
50 if (!(flags & OPT_SHORT) && p->opt)
51 return opterror(opt, "takes no value", flags);
52 if (flags & OPT_UNSET)
53 *(int *)opt->value = 0;
55 (*(int *)opt->value)++;
59 if (flags & OPT_UNSET) {
60 *(const char **)opt->value = (const char *)NULL;
63 if (opt->flags & PARSE_OPT_OPTARG && (!arg || *arg == '-')) {
64 *(const char **)opt->value = (const char *)opt->defval;
68 return opterror(opt, "requires a value", flags);
69 *(const char **)opt->value = get_arg(p);
73 if (flags & OPT_UNSET)
74 return (*opt->callback)(opt, NULL, 1);
75 if (opt->flags & PARSE_OPT_OPTARG && (!arg || *arg == '-'))
76 return (*opt->callback)(opt, NULL, 0);
78 return opterror(opt, "requires a value", flags);
79 return (*opt->callback)(opt, get_arg(p), 0);
82 if (flags & OPT_UNSET) {
83 *(int *)opt->value = 0;
86 if (opt->flags & PARSE_OPT_OPTARG && (!arg || !isdigit(*arg))) {
87 *(int *)opt->value = opt->defval;
91 return opterror(opt, "requires a value", flags);
92 *(int *)opt->value = strtol(get_arg(p), (char **)&s, 10);
94 return opterror(opt, "expects a numerical value", flags);
98 die("should not happen, someone must be hit on the forehead");
102 static int parse_short_opt(struct optparse_t *p, const struct option *options)
104 for (; options->type != OPTION_END; options++) {
105 if (options->short_name == *p->opt) {
106 p->opt = p->opt[1] ? p->opt + 1 : NULL;
107 return get_value(p, options, OPT_SHORT);
110 return error("unknown switch `%c'", *p->opt);
113 static int parse_long_opt(struct optparse_t *p, const char *arg,
114 const struct option *options)
116 for (; options->type != OPTION_END; options++) {
120 if (!options->long_name)
123 rest = skip_prefix(arg, options->long_name);
125 if (strncmp(arg, "no-", 3))
128 rest = skip_prefix(arg + 3, options->long_name);
137 return get_value(p, options, flags);
139 return error("unknown option `%s'", arg);
142 int parse_options(int argc, const char **argv, const struct option *options,
143 const char * const usagestr[], int flags)
145 struct optparse_t args = { argv + 1, argc - 1, NULL };
148 for (; args.argc; args.argc--, args.argv++) {
149 const char *arg = args.argv[0];
151 if (*arg != '-' || !arg[1]) {
152 argv[j++] = args.argv[0];
159 if (*args.opt == 'h')
160 usage_with_options(usagestr, options);
161 if (parse_short_opt(&args, options) < 0)
162 usage_with_options(usagestr, options);
167 if (!arg[2]) { /* "--" */
168 if (!(flags & PARSE_OPT_KEEP_DASHDASH)) {
175 if (!strcmp(arg + 2, "help"))
176 usage_with_options(usagestr, options);
177 if (parse_long_opt(&args, arg + 2, options))
178 usage_with_options(usagestr, options);
181 memmove(argv + j, args.argv, args.argc * sizeof(*argv));
182 argv[j + args.argc] = NULL;
183 return j + args.argc;
186 #define USAGE_OPTS_WIDTH 24
189 void usage_with_options(const char * const *usagestr,
190 const struct option *opts)
192 fprintf(stderr, "usage: %s\n", *usagestr++);
193 while (*usagestr && **usagestr)
194 fprintf(stderr, " or: %s\n", *usagestr++);
196 fprintf(stderr, " %s\n", *usagestr++);
198 if (opts->type != OPTION_GROUP)
201 for (; opts->type != OPTION_END; opts++) {
205 if (opts->type == OPTION_GROUP) {
208 fprintf(stderr, "%s\n", opts->help);
212 pos = fprintf(stderr, " ");
213 if (opts->short_name)
214 pos += fprintf(stderr, "-%c", opts->short_name);
215 if (opts->long_name && opts->short_name)
216 pos += fprintf(stderr, ", ");
218 pos += fprintf(stderr, "--%s", opts->long_name);
220 switch (opts->type) {
222 if (opts->flags & PARSE_OPT_OPTARG)
223 pos += fprintf(stderr, " [<n>]");
225 pos += fprintf(stderr, " <n>");
228 case OPTION_CALLBACK:
230 if (opts->flags & PARSE_OPT_OPTARG)
231 pos += fprintf(stderr, " [<%s>]", opts->argh);
233 pos += fprintf(stderr, " <%s>", opts->argh);
235 if (opts->flags & PARSE_OPT_OPTARG)
236 pos += fprintf(stderr, " [...]");
238 pos += fprintf(stderr, " ...");
245 if (pos <= USAGE_OPTS_WIDTH)
246 pad = USAGE_OPTS_WIDTH - pos;
249 pad = USAGE_OPTS_WIDTH;
251 fprintf(stderr, "%*s%s\n", pad + USAGE_GAP, "", opts->help);