Documentation: config: add "browser.<tool>.path".
[git.git] / parse-options.h
blob102ac31fb727acfdc3c2159e1525c7bcca94e1ef
1 #ifndef PARSE_OPTIONS_H
2 #define PARSE_OPTIONS_H
4 enum parse_opt_type {
5 /* special types */
6 OPTION_END,
7 OPTION_GROUP,
8 /* options with no arguments */
9 OPTION_BIT,
10 OPTION_BOOLEAN, /* _INCR would have been a better name */
11 OPTION_SET_INT,
12 OPTION_SET_PTR,
13 /* options with arguments (usually) */
14 OPTION_STRING,
15 OPTION_INTEGER,
16 OPTION_CALLBACK,
19 enum parse_opt_flags {
20 PARSE_OPT_KEEP_DASHDASH = 1,
23 enum parse_opt_option_flags {
24 PARSE_OPT_OPTARG = 1,
25 PARSE_OPT_NOARG = 2,
26 PARSE_OPT_NONEG = 4,
27 PARSE_OPT_HIDDEN = 8,
30 struct option;
31 typedef int parse_opt_cb(const struct option *, const char *arg, int unset);
34 * `type`::
35 * holds the type of the option, you must have an OPTION_END last in your
36 * array.
38 * `short_name`::
39 * the character to use as a short option name, '\0' if none.
41 * `long_name`::
42 * the long option name, without the leading dashes, NULL if none.
44 * `value`::
45 * stores pointers to the values to be filled.
47 * `argh`::
48 * token to explain the kind of argument this option wants. Keep it
49 * homogenous across the repository.
51 * `help`::
52 * the short help associated to what the option does.
53 * Must never be NULL (except for OPTION_END).
54 * OPTION_GROUP uses this pointer to store the group header.
56 * `flags`::
57 * mask of parse_opt_option_flags.
58 * PARSE_OPT_OPTARG: says that the argument is optionnal (not for BOOLEANs)
59 * PARSE_OPT_NOARG: says that this option takes no argument, for CALLBACKs
60 * PARSE_OPT_NONEG: says that this option cannot be negated
61 * PARSE_OPT_HIDDEN this option is skipped in the default usage, showed in
62 * the long one.
64 * `callback`::
65 * pointer to the callback to use for OPTION_CALLBACK.
67 * `defval`::
68 * default value to fill (*->value) with for PARSE_OPT_OPTARG.
69 * OPTION_{BIT,SET_INT,SET_PTR} store the {mask,integer,pointer} to put in
70 * the value when met.
71 * CALLBACKS can use it like they want.
73 struct option {
74 enum parse_opt_type type;
75 int short_name;
76 const char *long_name;
77 void *value;
78 const char *argh;
79 const char *help;
81 int flags;
82 parse_opt_cb *callback;
83 intptr_t defval;
86 #define OPT_END() { OPTION_END }
87 #define OPT_GROUP(h) { OPTION_GROUP, 0, NULL, NULL, NULL, (h) }
88 #define OPT_BIT(s, l, v, h, b) { OPTION_BIT, (s), (l), (v), NULL, (h), 0, NULL, (b) }
89 #define OPT_BOOLEAN(s, l, v, h) { OPTION_BOOLEAN, (s), (l), (v), NULL, (h) }
90 #define OPT_SET_INT(s, l, v, h, i) { OPTION_SET_INT, (s), (l), (v), NULL, (h), 0, NULL, (i) }
91 #define OPT_SET_PTR(s, l, v, h, p) { OPTION_SET_PTR, (s), (l), (v), NULL, (h), 0, NULL, (p) }
92 #define OPT_INTEGER(s, l, v, h) { OPTION_INTEGER, (s), (l), (v), NULL, (h) }
93 #define OPT_STRING(s, l, v, a, h) { OPTION_STRING, (s), (l), (v), (a), (h) }
94 #define OPT_CALLBACK(s, l, v, a, h, f) \
95 { OPTION_CALLBACK, (s), (l), (v), (a), (h), 0, (f) }
97 /* parse_options() will filter out the processed options and leave the
98 * non-option argments in argv[].
99 * Returns the number of arguments left in argv[].
101 extern int parse_options(int argc, const char **argv,
102 const struct option *options,
103 const char * const usagestr[], int flags);
105 extern NORETURN void usage_with_options(const char * const *usagestr,
106 const struct option *options);
108 /*----- some often used options -----*/
109 extern int parse_opt_abbrev_cb(const struct option *, const char *, int);
111 #define OPT__VERBOSE(var) OPT_BOOLEAN('v', "verbose", (var), "be verbose")
112 #define OPT__QUIET(var) OPT_BOOLEAN('q', "quiet", (var), "be quiet")
113 #define OPT__DRY_RUN(var) OPT_BOOLEAN('n', "dry-run", (var), "dry run")
114 #define OPT__ABBREV(var) \
115 { OPTION_CALLBACK, 0, "abbrev", (var), "n", \
116 "use <n> digits to display SHA-1s", \
117 PARSE_OPT_OPTARG, &parse_opt_abbrev_cb, 0 }
119 #endif