1 #ifndef PARSE_OPTIONS_H
2 #define PARSE_OPTIONS_H
3
4 enum parse_opt_type {
5 /* special types */
6 OPTION_END,
7 OPTION_ARGUMENT,
8 OPTION_GROUP,
9 /* options with no arguments */
10 OPTION_BIT,
11 OPTION_BOOLEAN, /* _INCR would have been a better name */
12 OPTION_SET_INT,
13 OPTION_SET_PTR,
14 /* options with arguments (usually) */
15 OPTION_STRING,
16 OPTION_INTEGER,
17 OPTION_LONG,
18 OPTION_CALLBACK,
19 };
20
21 enum parse_opt_flags {
22 PARSE_OPT_KEEP_DASHDASH = 1,
23 PARSE_OPT_STOP_AT_NON_OPTION = 2,
24 PARSE_OPT_KEEP_ARGV0 = 4,
25 PARSE_OPT_KEEP_UNKNOWN = 8,
26 PARSE_OPT_NO_INTERNAL_HELP = 16,
27 };
28
29 enum parse_opt_option_flags {
30 PARSE_OPT_OPTARG = 1,
31 PARSE_OPT_NOARG = 2,
32 PARSE_OPT_NONEG = 4,
33 PARSE_OPT_HIDDEN = 8,
34 PARSE_OPT_LASTARG_DEFAULT = 16,
35 };
36
37 struct option;
38 typedef int parse_opt_cb(const struct option *, const char *arg, int unset);
39
40 /*
41 * `type`::
42 * holds the type of the option, you must have an OPTION_END last in your
43 * array.
44 *
45 * `short_name`::
46 * the character to use as a short option name, '\0' if none.
47 *
48 * `long_name`::
49 * the long option name, without the leading dashes, NULL if none.
50 *
51 * `value`::
52 * stores pointers to the values to be filled.
53 *
54 * `argh`::
55 * token to explain the kind of argument this option wants. Keep it
56 * homogenous across the repository.
57 *
58 * `help`::
59 * the short help associated to what the option does.
60 * Must never be NULL (except for OPTION_END).
61 * OPTION_GROUP uses this pointer to store the group header.
62 *
63 * `flags`::
64 * mask of parse_opt_option_flags.
65 * PARSE_OPT_OPTARG: says that the argument is optionnal (not for BOOLEANs)
66 * PARSE_OPT_NOARG: says that this option takes no argument, for CALLBACKs
67 * PARSE_OPT_NONEG: says that this option cannot be negated
68 * PARSE_OPT_HIDDEN this option is skipped in the default usage, showed in
69 * the long one.
70 *
71 * `callback`::
72 * pointer to the callback to use for OPTION_CALLBACK.
73 *
74 * `defval`::
75 * default value to fill (*->value) with for PARSE_OPT_OPTARG.
76 * OPTION_{BIT,SET_INT,SET_PTR} store the {mask,integer,pointer} to put in
77 * the value when met.
78 * CALLBACKS can use it like they want.
79 */
80 struct option {
81 enum parse_opt_type type;
82 int short_name;
83 const char *long_name;
84 void *value;
85 const char *argh;
86 const char *help;
87
88 int flags;
89 parse_opt_cb *callback;
90 intptr_t defval;
91 };
92
93 #define OPT_END() { .type = OPTION_END }
94 #define OPT_ARGUMENT(l, h) { .type = OPTION_ARGUMENT, .long_name = (l), .help = (h) }
95 #define OPT_GROUP(h) { .type = OPTION_GROUP, .help = (h) }
96 #define OPT_BIT(s, l, v, h, b) { .type = OPTION_BIT, .short_name = (s), .long_name = (l), .value = (v), .help = (h), .defval = (b) }
97 #define OPT_BOOLEAN(s, l, v, h) { .type = OPTION_BOOLEAN, .short_name = (s), .long_name = (l), .value = (v), .help = (h) }
98 #define OPT_SET_INT(s, l, v, h, i) { .type = OPTION_SET_INT, .short_name = (s), .long_name = (l), .value = (v), .help = (h), .defval = (i) }
99 #define OPT_SET_PTR(s, l, v, h, p) { .type = OPTION_SET_PTR, .short_name = (s), .long_name = (l), .value = (v), .help = (h), .defval = (p) }
100 #define OPT_INTEGER(s, l, v, h) { .type = OPTION_INTEGER, .short_name = (s), .long_name = (l), .value = (v), .help = (h) }
101 #define OPT_LONG(s, l, v, h) { .type = OPTION_LONG, .short_name = (s), .long_name = (l), .value = (v), .help = (h) }
102 #define OPT_STRING(s, l, v, a, h) { .type = OPTION_STRING, .short_name = (s), .long_name = (l), .value = (v), (a), .help = (h) }
103 #define OPT_DATE(s, l, v, h) \
104 { .type = OPTION_CALLBACK, .short_name = (s), .long_name = (l), .value = (v), .argh = "time", .help = (h), .callback = parse_opt_approxidate_cb }
105 #define OPT_CALLBACK(s, l, v, a, h, f) \
106 { .type = OPTION_CALLBACK, .short_name = (s), .long_name = (l), .value = (v), (a), .help = (h), .callback = (f) }
107 #define OPT_CALLBACK_DEFAULT(s, l, v, a, h, f, d) \
108 { .type = OPTION_CALLBACK, .short_name = (s), .long_name = (l), .value = (v), (a), .help = (h), .callback = (f), .defval = (intptr_t)d, .flags = PARSE_OPT_LASTARG_DEFAULT }
109
110 /* parse_options() will filter out the processed options and leave the
111 * non-option argments in argv[].
112 * Returns the number of arguments left in argv[].
113 */
114 extern int parse_options(int argc, const char **argv,
115 const struct option *options,
116 const char * const usagestr[], int flags);
117
118 extern NORETURN void usage_with_options(const char * const *usagestr,
119 const struct option *options);
120
121 /*----- incremantal advanced APIs -----*/
122
123 enum {
124 PARSE_OPT_HELP = -1,
125 PARSE_OPT_DONE,
126 PARSE_OPT_UNKNOWN,
127 };
128
129 /*
130 * It's okay for the caller to consume argv/argc in the usual way.
131 * Other fields of that structure are private to parse-options and should not
132 * be modified in any way.
133 */
134 struct parse_opt_ctx_t {
135 const char **argv;
136 const char **out;
137 int argc, cpidx;
138 const char *opt;
139 int flags;
140 };
141
142 extern int parse_options_usage(const char * const *usagestr,
143 const struct option *opts);
144
145 extern void parse_options_start(struct parse_opt_ctx_t *ctx,
146 int argc, const char **argv, int flags);
147
148 extern int parse_options_step(struct parse_opt_ctx_t *ctx,
149 const struct option *options,
150 const char * const usagestr[]);
151
152 extern int parse_options_end(struct parse_opt_ctx_t *ctx);
153
154
155 /*----- some often used options -----*/
156 extern int parse_opt_abbrev_cb(const struct option *, const char *, int);
157 extern int parse_opt_approxidate_cb(const struct option *, const char *, int);
158 extern int parse_opt_verbosity_cb(const struct option *, const char *, int);
159
160 #define OPT__VERBOSE(var) OPT_BOOLEAN('v', "verbose", (var), "be verbose")
161 #define OPT__QUIET(var) OPT_BOOLEAN('q', "quiet", (var), "be quiet")
162 #define OPT__VERBOSITY(var) \
163 { OPTION_CALLBACK, 'v', "verbose", (var), NULL, "be more verbose", \
164 PARSE_OPT_NOARG, &parse_opt_verbosity_cb, 0 }, \
165 { OPTION_CALLBACK, 'q', "quiet", (var), NULL, "be more quiet", \
166 PARSE_OPT_NOARG, &parse_opt_verbosity_cb, 0 }
167 #define OPT__DRY_RUN(var) OPT_BOOLEAN('n', "dry-run", (var), "dry run")
168 #define OPT__ABBREV(var) \
169 { OPTION_CALLBACK, 0, "abbrev", (var), "n", \
170 "use <n> digits to display SHA-1s", \
171 PARSE_OPT_OPTARG, &parse_opt_abbrev_cb, 0 }
172
173 extern const char *parse_options_fix_filename(const char *prefix, const char *file);
174
175 #endif
176
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