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1 | #ifndef PARSE_OPTIONS_H | |
2 | #define PARSE_OPTIONS_H | |
3 | ||
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, | |
17 | }; | |
18 | ||
19 | enum parse_opt_flags { | |
20 | PARSE_OPT_KEEP_DASHDASH = 1, | |
21 | }; | |
22 | ||
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, | |
28 | }; | |
29 | ||
30 | struct option; | |
31 | typedef int parse_opt_cb(const struct option *, const char *arg, int unset); | |
32 | ||
33 | /* | |
34 | * `type`:: | |
35 | * holds the type of the option, you must have an OPTION_END last in your | |
36 | * array. | |
37 | * | |
38 | * `short_name`:: | |
39 | * the character to use as a short option name, '\0' if none. | |
40 | * | |
41 | * `long_name`:: | |
42 | * the long option name, without the leading dashes, NULL if none. | |
43 | * | |
44 | * `value`:: | |
45 | * stores pointers to the values to be filled. | |
46 | * | |
47 | * `argh`:: | |
48 | * token to explain the kind of argument this option wants. Keep it | |
49 | * homogenous across the repository. | |
50 | * | |
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. | |
55 | * | |
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. | |
63 | * | |
64 | * `callback`:: | |
65 | * pointer to the callback to use for OPTION_CALLBACK. | |
66 | * | |
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. | |
72 | */ | |
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; | |
80 | ||
81 | int flags; | |
82 | parse_opt_cb *callback; | |
83 | intptr_t defval; | |
84 | }; | |
85 | ||
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) } | |
96 | ||
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[]. | |
100 | */ | |
101 | extern int parse_options(int argc, const char **argv, | |
102 | const struct option *options, | |
103 | const char * const usagestr[], int flags); | |
104 | ||
105 | extern NORETURN void usage_with_options(const char * const *usagestr, | |
106 | const struct option *options); | |
107 | ||
108 | /*----- some often used options -----*/ | |
109 | extern int parse_opt_abbrev_cb(const struct option *, const char *, int); | |
110 | ||
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 } | |
118 | ||
119 | #endif |