parse-options.h

   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 does not take an 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