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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_ARGUMENT, | |
8 | OPTION_GROUP, | |
9 | OPTION_NUMBER, | |
10 | /* options with no arguments */ | |
11 | OPTION_BIT, | |
12 | OPTION_NEGBIT, | |
13 | OPTION_BOOLEAN, /* _INCR would have been a better name */ | |
14 | OPTION_SET_INT, | |
15 | OPTION_SET_PTR, | |
16 | /* options with arguments (usually) */ | |
17 | OPTION_STRING, | |
18 | OPTION_INTEGER, | |
19 | OPTION_CALLBACK, | |
20 | OPTION_FILENAME | |
21 | }; | |
22 | ||
23 | enum parse_opt_flags { | |
24 | PARSE_OPT_KEEP_DASHDASH = 1, | |
25 | PARSE_OPT_STOP_AT_NON_OPTION = 2, | |
26 | PARSE_OPT_KEEP_ARGV0 = 4, | |
27 | PARSE_OPT_KEEP_UNKNOWN = 8, | |
28 | PARSE_OPT_NO_INTERNAL_HELP = 16 | |
29 | }; | |
30 | ||
31 | enum parse_opt_option_flags { | |
32 | PARSE_OPT_OPTARG = 1, | |
33 | PARSE_OPT_NOARG = 2, | |
34 | PARSE_OPT_NONEG = 4, | |
35 | PARSE_OPT_HIDDEN = 8, | |
36 | PARSE_OPT_LASTARG_DEFAULT = 16, | |
37 | PARSE_OPT_NODASH = 32, | |
38 | PARSE_OPT_LITERAL_ARGHELP = 64, | |
39 | PARSE_OPT_NEGHELP = 128, | |
40 | PARSE_OPT_SHELL_EVAL = 256 | |
41 | }; | |
42 | ||
43 | struct option; | |
44 | typedef int parse_opt_cb(const struct option *, const char *arg, int unset); | |
45 | ||
46 | /* | |
47 | * `type`:: | |
48 | * holds the type of the option, you must have an OPTION_END last in your | |
49 | * array. | |
50 | * | |
51 | * `short_name`:: | |
52 | * the character to use as a short option name, '\0' if none. | |
53 | * | |
54 | * `long_name`:: | |
55 | * the long option name, without the leading dashes, NULL if none. | |
56 | * | |
57 | * `value`:: | |
58 | * stores pointers to the values to be filled. | |
59 | * | |
60 | * `argh`:: | |
61 | * token to explain the kind of argument this option wants. Keep it | |
62 | * homogeneous across the repository. | |
63 | * | |
64 | * `help`:: | |
65 | * the short help associated to what the option does. | |
66 | * Must never be NULL (except for OPTION_END). | |
67 | * OPTION_GROUP uses this pointer to store the group header. | |
68 | * | |
69 | * `flags`:: | |
70 | * mask of parse_opt_option_flags. | |
71 | * PARSE_OPT_OPTARG: says that the argument is optional (not for BOOLEANs) | |
72 | * PARSE_OPT_NOARG: says that this option takes no argument | |
73 | * PARSE_OPT_NONEG: says that this option cannot be negated | |
74 | * PARSE_OPT_HIDDEN: this option is skipped in the default usage, and | |
75 | * shown only in the full usage. | |
76 | * PARSE_OPT_LASTARG_DEFAULT: says that this option will take the default | |
77 | * value if no argument is given when the option | |
78 | * is last on the command line. If the option is | |
79 | * not last it will require an argument. | |
80 | * Should not be used with PARSE_OPT_OPTARG. | |
81 | * PARSE_OPT_NODASH: this option doesn't start with a dash. | |
82 | * PARSE_OPT_LITERAL_ARGHELP: says that argh shouldn't be enclosed in brackets | |
83 | * (i.e. '<argh>') in the help message. | |
84 | * Useful for options with multiple parameters. | |
85 | * PARSE_OPT_NEGHELP: says that the long option should always be shown with | |
86 | * the --no prefix in the usage message. Sometimes | |
87 | * useful for users of OPTION_NEGBIT. | |
88 | * | |
89 | * `callback`:: | |
90 | * pointer to the callback to use for OPTION_CALLBACK. | |
91 | * | |
92 | * `defval`:: | |
93 | * default value to fill (*->value) with for PARSE_OPT_OPTARG. | |
94 | * OPTION_{BIT,SET_INT,SET_PTR} store the {mask,integer,pointer} to put in | |
95 | * the value when met. | |
96 | * CALLBACKS can use it like they want. | |
97 | */ | |
98 | struct option { | |
99 | enum parse_opt_type type; | |
100 | int short_name; | |
101 | const char *long_name; | |
102 | void *value; | |
103 | const char *argh; | |
104 | const char *help; | |
105 | ||
106 | int flags; | |
107 | parse_opt_cb *callback; | |
108 | intptr_t defval; | |
109 | }; | |
110 | ||
111 | #define OPT_END() { OPTION_END } | |
112 | #define OPT_ARGUMENT(l, h) { OPTION_ARGUMENT, 0, (l), NULL, NULL, \ | |
113 | (h), PARSE_OPT_NOARG} | |
114 | #define OPT_GROUP(h) { OPTION_GROUP, 0, NULL, NULL, NULL, (h) } | |
115 | #define OPT_BIT(s, l, v, h, b) { OPTION_BIT, (s), (l), (v), NULL, (h), \ | |
116 | PARSE_OPT_NOARG, NULL, (b) } | |
117 | #define OPT_NEGBIT(s, l, v, h, b) { OPTION_NEGBIT, (s), (l), (v), NULL, \ | |
118 | (h), PARSE_OPT_NOARG, NULL, (b) } | |
119 | #define OPT_BOOLEAN(s, l, v, h) { OPTION_BOOLEAN, (s), (l), (v), NULL, \ | |
120 | (h), PARSE_OPT_NOARG } | |
121 | #define OPT_SET_INT(s, l, v, h, i) { OPTION_SET_INT, (s), (l), (v), NULL, \ | |
122 | (h), PARSE_OPT_NOARG, NULL, (i) } | |
123 | #define OPT_SET_PTR(s, l, v, h, p) { OPTION_SET_PTR, (s), (l), (v), NULL, \ | |
124 | (h), PARSE_OPT_NOARG, NULL, (p) } | |
125 | #define OPT_INTEGER(s, l, v, h) { OPTION_INTEGER, (s), (l), (v), "n", (h) } | |
126 | #define OPT_STRING(s, l, v, a, h) { OPTION_STRING, (s), (l), (v), (a), (h) } | |
127 | #define OPT_UYN(s, l, v, h) { OPTION_CALLBACK, (s), (l), (v), NULL, \ | |
128 | (h), PARSE_OPT_NOARG, &parse_opt_tertiary } | |
129 | #define OPT_DATE(s, l, v, h) \ | |
130 | { OPTION_CALLBACK, (s), (l), (v), "time",(h), 0, \ | |
131 | parse_opt_approxidate_cb } | |
132 | #define OPT_CALLBACK(s, l, v, a, h, f) \ | |
133 | { OPTION_CALLBACK, (s), (l), (v), (a), (h), 0, (f) } | |
134 | #define OPT_NUMBER_CALLBACK(v, h, f) \ | |
135 | { OPTION_NUMBER, 0, NULL, (v), NULL, (h), \ | |
136 | PARSE_OPT_NOARG | PARSE_OPT_NONEG, (f) } | |
137 | #define OPT_FILENAME(s, l, v, h) { OPTION_FILENAME, (s), (l), (v), \ | |
138 | "FILE", (h) } | |
139 | #define OPT_COLOR_FLAG(s, l, v, h) \ | |
140 | { OPTION_CALLBACK, (s), (l), (v), "when", (h), PARSE_OPT_OPTARG, \ | |
141 | parse_opt_color_flag_cb, (intptr_t)"always" } | |
142 | ||
143 | ||
144 | /* parse_options() will filter out the processed options and leave the | |
145 | * non-option arguments in argv[]. | |
146 | * Returns the number of arguments left in argv[]. | |
147 | */ | |
148 | extern int parse_options(int argc, const char **argv, const char *prefix, | |
149 | const struct option *options, | |
150 | const char * const usagestr[], int flags); | |
151 | ||
152 | extern NORETURN void usage_with_options(const char * const *usagestr, | |
153 | const struct option *options); | |
154 | ||
155 | extern NORETURN void usage_msg_opt(const char *msg, | |
156 | const char * const *usagestr, | |
157 | const struct option *options); | |
158 | ||
159 | /*----- incremental advanced APIs -----*/ | |
160 | ||
161 | enum { | |
162 | PARSE_OPT_HELP = -1, | |
163 | PARSE_OPT_DONE, | |
164 | PARSE_OPT_UNKNOWN | |
165 | }; | |
166 | ||
167 | /* | |
168 | * It's okay for the caller to consume argv/argc in the usual way. | |
169 | * Other fields of that structure are private to parse-options and should not | |
170 | * be modified in any way. | |
171 | */ | |
172 | struct parse_opt_ctx_t { | |
173 | const char **argv; | |
174 | const char **out; | |
175 | int argc, cpidx; | |
176 | const char *opt; | |
177 | int flags; | |
178 | const char *prefix; | |
179 | }; | |
180 | ||
181 | extern void parse_options_start(struct parse_opt_ctx_t *ctx, | |
182 | int argc, const char **argv, const char *prefix, | |
183 | int flags); | |
184 | ||
185 | extern int parse_options_step(struct parse_opt_ctx_t *ctx, | |
186 | const struct option *options, | |
187 | const char * const usagestr[]); | |
188 | ||
189 | extern int parse_options_end(struct parse_opt_ctx_t *ctx); | |
190 | ||
191 | extern int parse_options_concat(struct option *dst, size_t, struct option *src); | |
192 | ||
193 | /*----- some often used options -----*/ | |
194 | extern int parse_opt_abbrev_cb(const struct option *, const char *, int); | |
195 | extern int parse_opt_approxidate_cb(const struct option *, const char *, int); | |
196 | extern int parse_opt_color_flag_cb(const struct option *, const char *, int); | |
197 | extern int parse_opt_verbosity_cb(const struct option *, const char *, int); | |
198 | extern int parse_opt_with_commit(const struct option *, const char *, int); | |
199 | extern int parse_opt_tertiary(const struct option *, const char *, int); | |
200 | ||
201 | #define OPT__VERBOSE(var) OPT_BOOLEAN('v', "verbose", (var), "be verbose") | |
202 | #define OPT__QUIET(var) OPT_BOOLEAN('q', "quiet", (var), "be quiet") | |
203 | #define OPT__VERBOSITY(var) \ | |
204 | { OPTION_CALLBACK, 'v', "verbose", (var), NULL, "be more verbose", \ | |
205 | PARSE_OPT_NOARG, &parse_opt_verbosity_cb, 0 }, \ | |
206 | { OPTION_CALLBACK, 'q', "quiet", (var), NULL, "be more quiet", \ | |
207 | PARSE_OPT_NOARG, &parse_opt_verbosity_cb, 0 } | |
208 | #define OPT__DRY_RUN(var) OPT_BOOLEAN('n', "dry-run", (var), "dry run") | |
209 | #define OPT__ABBREV(var) \ | |
210 | { OPTION_CALLBACK, 0, "abbrev", (var), "n", \ | |
211 | "use <n> digits to display SHA-1s", \ | |
212 | PARSE_OPT_OPTARG, &parse_opt_abbrev_cb, 0 } | |
213 | #define OPT__COLOR(var, h) \ | |
214 | OPT_COLOR_FLAG(0, "color", (var), (h)) | |
215 | ||
216 | #endif |