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07800601 IM |
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_CALLBACK, | |
18 | }; | |
19 | ||
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, | |
24 | PARSE_OPT_KEEP_UNKNOWN = 8, | |
25 | PARSE_OPT_NO_INTERNAL_HELP = 16, | |
26 | }; | |
27 | ||
28 | enum parse_opt_option_flags { | |
29 | PARSE_OPT_OPTARG = 1, | |
30 | PARSE_OPT_NOARG = 2, | |
31 | PARSE_OPT_NONEG = 4, | |
32 | PARSE_OPT_HIDDEN = 8, | |
33 | PARSE_OPT_LASTARG_DEFAULT = 16, | |
34 | }; | |
35 | ||
36 | struct option; | |
37 | typedef int parse_opt_cb(const struct option *, const char *arg, int unset); | |
38 | ||
39 | /* | |
40 | * `type`:: | |
41 | * holds the type of the option, you must have an OPTION_END last in your | |
42 | * array. | |
43 | * | |
44 | * `short_name`:: | |
45 | * the character to use as a short option name, '\0' if none. | |
46 | * | |
47 | * `long_name`:: | |
48 | * the long option name, without the leading dashes, NULL if none. | |
49 | * | |
50 | * `value`:: | |
51 | * stores pointers to the values to be filled. | |
52 | * | |
53 | * `argh`:: | |
54 | * token to explain the kind of argument this option wants. Keep it | |
55 | * homogenous across the repository. | |
56 | * | |
57 | * `help`:: | |
58 | * the short help associated to what the option does. | |
59 | * Must never be NULL (except for OPTION_END). | |
60 | * OPTION_GROUP uses this pointer to store the group header. | |
61 | * | |
62 | * `flags`:: | |
63 | * mask of parse_opt_option_flags. | |
64 | * PARSE_OPT_OPTARG: says that the argument is optionnal (not for BOOLEANs) | |
65 | * PARSE_OPT_NOARG: says that this option takes no argument, for CALLBACKs | |
66 | * PARSE_OPT_NONEG: says that this option cannot be negated | |
67 | * PARSE_OPT_HIDDEN this option is skipped in the default usage, showed in | |
68 | * the long one. | |
69 | * | |
70 | * `callback`:: | |
71 | * pointer to the callback to use for OPTION_CALLBACK. | |
72 | * | |
73 | * `defval`:: | |
74 | * default value to fill (*->value) with for PARSE_OPT_OPTARG. | |
75 | * OPTION_{BIT,SET_INT,SET_PTR} store the {mask,integer,pointer} to put in | |
76 | * the value when met. | |
77 | * CALLBACKS can use it like they want. | |
78 | */ | |
79 | struct option { | |
80 | enum parse_opt_type type; | |
81 | int short_name; | |
82 | const char *long_name; | |
83 | void *value; | |
84 | const char *argh; | |
85 | const char *help; | |
86 | ||
87 | int flags; | |
88 | parse_opt_cb *callback; | |
89 | intptr_t defval; | |
90 | }; | |
91 | ||
92 | #define OPT_END() { OPTION_END } | |
93 | #define OPT_ARGUMENT(l, h) { OPTION_ARGUMENT, 0, (l), NULL, NULL, (h) } | |
94 | #define OPT_GROUP(h) { OPTION_GROUP, 0, NULL, NULL, NULL, (h) } | |
95 | #define OPT_BIT(s, l, v, h, b) { OPTION_BIT, (s), (l), (v), NULL, (h), 0, NULL, (b) } | |
96 | #define OPT_BOOLEAN(s, l, v, h) { OPTION_BOOLEAN, (s), (l), (v), NULL, (h) } | |
97 | #define OPT_SET_INT(s, l, v, h, i) { OPTION_SET_INT, (s), (l), (v), NULL, (h), 0, NULL, (i) } | |
98 | #define OPT_SET_PTR(s, l, v, h, p) { OPTION_SET_PTR, (s), (l), (v), NULL, (h), 0, NULL, (p) } | |
99 | #define OPT_INTEGER(s, l, v, h) { OPTION_INTEGER, (s), (l), (v), NULL, (h) } | |
100 | #define OPT_STRING(s, l, v, a, h) { OPTION_STRING, (s), (l), (v), (a), (h) } | |
101 | #define OPT_DATE(s, l, v, h) \ | |
102 | { OPTION_CALLBACK, (s), (l), (v), "time",(h), 0, \ | |
103 | parse_opt_approxidate_cb } | |
104 | #define OPT_CALLBACK(s, l, v, a, h, f) \ | |
105 | { OPTION_CALLBACK, (s), (l), (v), (a), (h), 0, (f) } | |
106 | ||
107 | /* parse_options() will filter out the processed options and leave the | |
108 | * non-option argments in argv[]. | |
109 | * Returns the number of arguments left in argv[]. | |
110 | */ | |
111 | extern int parse_options(int argc, const char **argv, | |
112 | const struct option *options, | |
113 | const char * const usagestr[], int flags); | |
114 | ||
115 | extern NORETURN void usage_with_options(const char * const *usagestr, | |
116 | const struct option *options); | |
117 | ||
118 | /*----- incremantal advanced APIs -----*/ | |
119 | ||
120 | enum { | |
121 | PARSE_OPT_HELP = -1, | |
122 | PARSE_OPT_DONE, | |
123 | PARSE_OPT_UNKNOWN, | |
124 | }; | |
125 | ||
126 | /* | |
127 | * It's okay for the caller to consume argv/argc in the usual way. | |
128 | * Other fields of that structure are private to parse-options and should not | |
129 | * be modified in any way. | |
130 | */ | |
131 | struct parse_opt_ctx_t { | |
132 | const char **argv; | |
133 | const char **out; | |
134 | int argc, cpidx; | |
135 | const char *opt; | |
136 | int flags; | |
137 | }; | |
138 | ||
139 | extern int parse_options_usage(const char * const *usagestr, | |
140 | const struct option *opts); | |
141 | ||
142 | extern void parse_options_start(struct parse_opt_ctx_t *ctx, | |
143 | int argc, const char **argv, int flags); | |
144 | ||
145 | extern int parse_options_step(struct parse_opt_ctx_t *ctx, | |
146 | const struct option *options, | |
147 | const char * const usagestr[]); | |
148 | ||
149 | extern int parse_options_end(struct parse_opt_ctx_t *ctx); | |
150 | ||
151 | ||
152 | /*----- some often used options -----*/ | |
153 | extern int parse_opt_abbrev_cb(const struct option *, const char *, int); | |
154 | extern int parse_opt_approxidate_cb(const struct option *, const char *, int); | |
155 | extern int parse_opt_verbosity_cb(const struct option *, const char *, int); | |
156 | ||
157 | #define OPT__VERBOSE(var) OPT_BOOLEAN('v', "verbose", (var), "be verbose") | |
158 | #define OPT__QUIET(var) OPT_BOOLEAN('q', "quiet", (var), "be quiet") | |
159 | #define OPT__VERBOSITY(var) \ | |
160 | { OPTION_CALLBACK, 'v', "verbose", (var), NULL, "be more verbose", \ | |
161 | PARSE_OPT_NOARG, &parse_opt_verbosity_cb, 0 }, \ | |
162 | { OPTION_CALLBACK, 'q', "quiet", (var), NULL, "be more quiet", \ | |
163 | PARSE_OPT_NOARG, &parse_opt_verbosity_cb, 0 } | |
164 | #define OPT__DRY_RUN(var) OPT_BOOLEAN('n', "dry-run", (var), "dry run") | |
165 | #define OPT__ABBREV(var) \ | |
166 | { OPTION_CALLBACK, 0, "abbrev", (var), "n", \ | |
167 | "use <n> digits to display SHA-1s", \ | |
168 | PARSE_OPT_OPTARG, &parse_opt_abbrev_cb, 0 } | |
169 | ||
170 | extern const char *parse_options_fix_filename(const char *prefix, const char *file); | |
171 | ||
172 | #endif |