gitweb: use new Git::Repo API, and add optional caching
[git/gitweb-caching.git] / parse-options.h
blob5199950c006df4625355ce227970cc3e8a72ed41
1 #ifndef PARSE_OPTIONS_H
2 #define PARSE_OPTIONS_H
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_CALLBACK,
20 enum parse_opt_flags {
21 PARSE_OPT_KEEP_DASHDASH = 1,
22 PARSE_OPT_STOP_AT_NON_OPTION = 2,
23 PARSE_OPT_KEEP_ARGV0 = 4,
26 enum parse_opt_option_flags {
27 PARSE_OPT_OPTARG = 1,
28 PARSE_OPT_NOARG = 2,
29 PARSE_OPT_NONEG = 4,
30 PARSE_OPT_HIDDEN = 8,
31 PARSE_OPT_LASTARG_DEFAULT = 16,
34 struct option;
35 typedef int parse_opt_cb(const struct option *, const char *arg, int unset);
38 * `type`::
39 * holds the type of the option, you must have an OPTION_END last in your
40 * array.
42 * `short_name`::
43 * the character to use as a short option name, '\0' if none.
45 * `long_name`::
46 * the long option name, without the leading dashes, NULL if none.
48 * `value`::
49 * stores pointers to the values to be filled.
51 * `argh`::
52 * token to explain the kind of argument this option wants. Keep it
53 * homogenous across the repository.
55 * `help`::
56 * the short help associated to what the option does.
57 * Must never be NULL (except for OPTION_END).
58 * OPTION_GROUP uses this pointer to store the group header.
60 * `flags`::
61 * mask of parse_opt_option_flags.
62 * PARSE_OPT_OPTARG: says that the argument is optionnal (not for BOOLEANs)
63 * PARSE_OPT_NOARG: says that this option takes no argument, for CALLBACKs
64 * PARSE_OPT_NONEG: says that this option cannot be negated
65 * PARSE_OPT_HIDDEN this option is skipped in the default usage, showed in
66 * the long one.
68 * `callback`::
69 * pointer to the callback to use for OPTION_CALLBACK.
71 * `defval`::
72 * default value to fill (*->value) with for PARSE_OPT_OPTARG.
73 * OPTION_{BIT,SET_INT,SET_PTR} store the {mask,integer,pointer} to put in
74 * the value when met.
75 * CALLBACKS can use it like they want.
77 struct option {
78 enum parse_opt_type type;
79 int short_name;
80 const char *long_name;
81 void *value;
82 const char *argh;
83 const char *help;
85 int flags;
86 parse_opt_cb *callback;
87 intptr_t defval;
90 #define OPT_END() { OPTION_END }
91 #define OPT_ARGUMENT(l, h) { OPTION_ARGUMENT, 0, (l), NULL, NULL, (h) }
92 #define OPT_GROUP(h) { OPTION_GROUP, 0, NULL, NULL, NULL, (h) }
93 #define OPT_BIT(s, l, v, h, b) { OPTION_BIT, (s), (l), (v), NULL, (h), 0, NULL, (b) }
94 #define OPT_BOOLEAN(s, l, v, h) { OPTION_BOOLEAN, (s), (l), (v), NULL, (h) }
95 #define OPT_SET_INT(s, l, v, h, i) { OPTION_SET_INT, (s), (l), (v), NULL, (h), 0, NULL, (i) }
96 #define OPT_SET_PTR(s, l, v, h, p) { OPTION_SET_PTR, (s), (l), (v), NULL, (h), 0, NULL, (p) }
97 #define OPT_INTEGER(s, l, v, h) { OPTION_INTEGER, (s), (l), (v), NULL, (h) }
98 #define OPT_STRING(s, l, v, a, h) { OPTION_STRING, (s), (l), (v), (a), (h) }
99 #define OPT_DATE(s, l, v, h) \
100 { OPTION_CALLBACK, (s), (l), (v), "time",(h), 0, \
101 parse_opt_approxidate_cb }
102 #define OPT_CALLBACK(s, l, v, a, h, f) \
103 { OPTION_CALLBACK, (s), (l), (v), (a), (h), 0, (f) }
105 /* parse_options() will filter out the processed options and leave the
106 * non-option argments in argv[].
107 * Returns the number of arguments left in argv[].
109 extern int parse_options(int argc, const char **argv,
110 const struct option *options,
111 const char * const usagestr[], int flags);
113 extern NORETURN void usage_with_options(const char * const *usagestr,
114 const struct option *options);
116 /*----- incremantal advanced APIs -----*/
118 enum {
119 PARSE_OPT_HELP = -1,
120 PARSE_OPT_DONE,
121 PARSE_OPT_UNKNOWN,
125 * It's okay for the caller to consume argv/argc in the usual way.
126 * Other fields of that structure are private to parse-options and should not
127 * be modified in any way.
129 struct parse_opt_ctx_t {
130 const char **argv;
131 const char **out;
132 int argc, cpidx;
133 const char *opt;
134 int flags;
137 extern int parse_options_usage(const char * const *usagestr,
138 const struct option *opts);
140 extern void parse_options_start(struct parse_opt_ctx_t *ctx,
141 int argc, const char **argv, int flags);
143 extern int parse_options_step(struct parse_opt_ctx_t *ctx,
144 const struct option *options,
145 const char * const usagestr[]);
147 extern int parse_options_end(struct parse_opt_ctx_t *ctx);
150 /*----- some often used options -----*/
151 extern int parse_opt_abbrev_cb(const struct option *, const char *, int);
152 extern int parse_opt_approxidate_cb(const struct option *, const char *, int);
154 #define OPT__VERBOSE(var) OPT_BOOLEAN('v', "verbose", (var), "be verbose")
155 #define OPT__QUIET(var) OPT_BOOLEAN('q', "quiet", (var), "be quiet")
156 #define OPT__DRY_RUN(var) OPT_BOOLEAN('n', "dry-run", (var), "dry run")
157 #define OPT__ABBREV(var) \
158 { OPTION_CALLBACK, 0, "abbrev", (var), "n", \
159 "use <n> digits to display SHA-1s", \
160 PARSE_OPT_OPTARG, &parse_opt_abbrev_cb, 0 }
162 extern const char *parse_options_fix_filename(const char *prefix, const char *file);
164 #endif