parse-opt: fake short strings for callers to believe in.
[git/git.git] / parse-options.h
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1#ifndef PARSE_OPTIONS_H
2#define PARSE_OPTIONS_H
3
4enum parse_opt_type {
db7244bd 5 /* special types */
4a59fd13 6 OPTION_END,
580d5bff 7 OPTION_ARGUMENT,
d7a38c54 8 OPTION_GROUP,
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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) */
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15 OPTION_STRING,
16 OPTION_INTEGER,
ffe659f9 17 OPTION_CALLBACK,
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18};
19
20enum parse_opt_flags {
21 PARSE_OPT_KEEP_DASHDASH = 1,
a0ec9d25 22 PARSE_OPT_STOP_AT_NON_OPTION = 2,
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23};
24
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25enum parse_opt_option_flags {
26 PARSE_OPT_OPTARG = 1,
f481e22a 27 PARSE_OPT_NOARG = 2,
db7244bd 28 PARSE_OPT_NONEG = 4,
dd3bf0f4 29 PARSE_OPT_HIDDEN = 8,
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30};
31
32struct option;
33typedef int parse_opt_cb(const struct option *, const char *arg, int unset);
34
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35/*
36 * `type`::
37 * holds the type of the option, you must have an OPTION_END last in your
38 * array.
39 *
40 * `short_name`::
41 * the character to use as a short option name, '\0' if none.
42 *
43 * `long_name`::
44 * the long option name, without the leading dashes, NULL if none.
45 *
46 * `value`::
47 * stores pointers to the values to be filled.
48 *
49 * `argh`::
50 * token to explain the kind of argument this option wants. Keep it
51 * homogenous across the repository.
52 *
53 * `help`::
54 * the short help associated to what the option does.
55 * Must never be NULL (except for OPTION_END).
56 * OPTION_GROUP uses this pointer to store the group header.
57 *
58 * `flags`::
59 * mask of parse_opt_option_flags.
60 * PARSE_OPT_OPTARG: says that the argument is optionnal (not for BOOLEANs)
61 * PARSE_OPT_NOARG: says that this option takes no argument, for CALLBACKs
db7244bd 62 * PARSE_OPT_NONEG: says that this option cannot be negated
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63 * PARSE_OPT_HIDDEN this option is skipped in the default usage, showed in
64 * the long one.
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65 *
66 * `callback`::
67 * pointer to the callback to use for OPTION_CALLBACK.
68 *
69 * `defval`::
70 * default value to fill (*->value) with for PARSE_OPT_OPTARG.
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71 * OPTION_{BIT,SET_INT,SET_PTR} store the {mask,integer,pointer} to put in
72 * the value when met.
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73 * CALLBACKS can use it like they want.
74 */
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75struct option {
76 enum parse_opt_type type;
77 int short_name;
78 const char *long_name;
79 void *value;
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80 const char *argh;
81 const char *help;
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82
83 int flags;
84 parse_opt_cb *callback;
ffe659f9 85 intptr_t defval;
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86};
87
88#define OPT_END() { OPTION_END }
580d5bff 89#define OPT_ARGUMENT(l, h) { OPTION_ARGUMENT, 0, (l), NULL, NULL, (h) }
d7a38c54 90#define OPT_GROUP(h) { OPTION_GROUP, 0, NULL, NULL, NULL, (h) }
db7244bd 91#define OPT_BIT(s, l, v, h, b) { OPTION_BIT, (s), (l), (v), NULL, (h), 0, NULL, (b) }
d7a38c54 92#define OPT_BOOLEAN(s, l, v, h) { OPTION_BOOLEAN, (s), (l), (v), NULL, (h) }
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93#define OPT_SET_INT(s, l, v, h, i) { OPTION_SET_INT, (s), (l), (v), NULL, (h), 0, NULL, (i) }
94#define OPT_SET_PTR(s, l, v, h, p) { OPTION_SET_PTR, (s), (l), (v), NULL, (h), 0, NULL, (p) }
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95#define OPT_INTEGER(s, l, v, h) { OPTION_INTEGER, (s), (l), (v), NULL, (h) }
96#define OPT_STRING(s, l, v, a, h) { OPTION_STRING, (s), (l), (v), (a), (h) }
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97#define OPT_DATE(s, l, v, h) \
98 { OPTION_CALLBACK, (s), (l), (v), "time",(h), 0, \
99 parse_opt_approxidate_cb }
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100#define OPT_CALLBACK(s, l, v, a, h, f) \
101 { OPTION_CALLBACK, (s), (l), (v), (a), (h), 0, (f) }
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102
103/* parse_options() will filter out the processed options and leave the
104 * non-option argments in argv[].
105 * Returns the number of arguments left in argv[].
106 */
107extern int parse_options(int argc, const char **argv,
108 const struct option *options,
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109 const char * const usagestr[], int flags);
110
111extern NORETURN void usage_with_options(const char * const *usagestr,
112 const struct option *options);
4a59fd13 113
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114/*----- incremantal advanced APIs -----*/
115
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116enum {
117 PARSE_OPT_HELP = -1,
118 PARSE_OPT_DONE,
119 PARSE_OPT_UNKNOWN,
120};
121
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122/*
123 * It's okay for the caller to consume argv/argc in the usual way.
124 * Other fields of that structure are private to parse-options and should not
125 * be modified in any way.
126 */
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127struct parse_opt_ctx_t {
128 const char **argv;
129 const char **out;
130 int argc, cpidx;
131 const char *opt;
132 int flags;
133};
134
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135extern int parse_options_usage(const char * const *usagestr,
136 const struct option *opts);
137
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138extern void parse_options_start(struct parse_opt_ctx_t *ctx,
139 int argc, const char **argv, int flags);
140
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141extern int parse_options_step(struct parse_opt_ctx_t *ctx,
142 const struct option *options,
143 const char * const usagestr[]);
144
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145extern int parse_options_end(struct parse_opt_ctx_t *ctx);
146
147
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148/*----- some often used options -----*/
149extern int parse_opt_abbrev_cb(const struct option *, const char *, int);
1f4a711a 150extern int parse_opt_approxidate_cb(const struct option *, const char *, int);
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151
152#define OPT__VERBOSE(var) OPT_BOOLEAN('v', "verbose", (var), "be verbose")
153#define OPT__QUIET(var) OPT_BOOLEAN('q', "quiet", (var), "be quiet")
154#define OPT__DRY_RUN(var) OPT_BOOLEAN('n', "dry-run", (var), "dry run")
155#define OPT__ABBREV(var) \
156 { OPTION_CALLBACK, 0, "abbrev", (var), "n", \
157 "use <n> digits to display SHA-1s", \
158 PARSE_OPT_OPTARG, &parse_opt_abbrev_cb, 0 }
159
4a59fd13 160#endif