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_LOWLEVEL_CALLBACK,
  21         OPTION_FILENAME
  22 };
  23
  24 enum parse_opt_flags {
  25         PARSE_OPT_KEEP_DASHDASH = 1,
  26         PARSE_OPT_STOP_AT_NON_OPTION = 2,
  27         PARSE_OPT_KEEP_ARGV0 = 4,
  28         PARSE_OPT_KEEP_UNKNOWN = 8,
  29         PARSE_OPT_NO_INTERNAL_HELP = 16
  30 };
  31
  32 enum parse_opt_option_flags {
  33         PARSE_OPT_OPTARG  = 1,
  34         PARSE_OPT_NOARG   = 2,
  35         PARSE_OPT_NONEG   = 4,
  36         PARSE_OPT_HIDDEN  = 8,
  37         PARSE_OPT_LASTARG_DEFAULT = 16,
  38         PARSE_OPT_NODASH = 32,
  39         PARSE_OPT_LITERAL_ARGHELP = 64,
  40         PARSE_OPT_NEGHELP = 128,
  41         PARSE_OPT_SHELL_EVAL = 256
  42 };
  43
  44 struct option;
  45 typedef int parse_opt_cb(const struct option *, const char *arg, int unset);
  46
  47 struct parse_opt_ctx_t;
  48 typedef int parse_opt_ll_cb(struct parse_opt_ctx_t *ctx,
  49                                 const struct option *opt, int unset);
  50
  51 /*
  52  * `type`::
  53  *   holds the type of the option, you must have an OPTION_END last in your
  54  *   array.
  55  *
  56  * `short_name`::
  57  *   the character to use as a short option name, '\0' if none.
  58  *
  59  * `long_name`::
  60  *   the long option name, without the leading dashes, NULL if none.
  61  *
  62  * `value`::
  63  *   stores pointers to the values to be filled.
  64  *
  65  * `argh`::
  66  *   token to explain the kind of argument this option wants. Keep it
  67  *   homogeneous across the repository.
  68  *
  69  * `help`::
  70  *   the short help associated to what the option does.
  71  *   Must never be NULL (except for OPTION_END).
  72  *   OPTION_GROUP uses this pointer to store the group header.
  73  *
  74  * `flags`::
  75  *   mask of parse_opt_option_flags.
  76  *   PARSE_OPT_OPTARG: says that the argument is optional (not for BOOLEANs)
  77  *   PARSE_OPT_NOARG: says that this option does not take an argument
  78  *   PARSE_OPT_NONEG: says that this option cannot be negated
  79  *   PARSE_OPT_HIDDEN: this option is skipped in the default usage, and
  80  *                     shown only in the full usage.
  81  *   PARSE_OPT_LASTARG_DEFAULT: says that this option will take the default
  82  *                              value if no argument is given when the option
  83  *                              is last on the command line. If the option is
  84  *                              not last it will require an argument.
  85  *                              Should not be used with PARSE_OPT_OPTARG.
  86  *   PARSE_OPT_NODASH: this option doesn't start with a dash.
  87  *   PARSE_OPT_LITERAL_ARGHELP: says that argh shouldn't be enclosed in brackets
  88  *                              (i.e. '<argh>') in the help message.
  89  *                              Useful for options with multiple parameters.
  90  *   PARSE_OPT_NEGHELP: says that the long option should always be shown with
  91  *                              the --no prefix in the usage message. Sometimes
  92  *                              useful for users of OPTION_NEGBIT.
  93  *
  94  * `callback`::
  95  *   pointer to the callback to use for OPTION_CALLBACK or
  96  *   OPTION_LOWLEVEL_CALLBACK.
  97  *
  98  * `defval`::
  99  *   default value to fill (*->value) with for PARSE_OPT_OPTARG.
 100  *   OPTION_{BIT,SET_INT,SET_PTR} store the {mask,integer,pointer} to put in
 101  *   the value when met.
 102  *   CALLBACKS can use it like they want.
 103  */
 104 struct option {
 105         enum parse_opt_type type;
 106         int short_name;
 107         const char *long_name;
 108         void *value;
 109         const char *argh;
 110         const char *help;
 111
 112         int flags;
 113         parse_opt_cb *callback;
 114         intptr_t defval;
 115 };
 116
 117 #define OPT_END()                   { OPTION_END }
 118 #define OPT_ARGUMENT(l, h)          { OPTION_ARGUMENT, 0, (l), NULL, NULL, \
 119                                       (h), PARSE_OPT_NOARG}
 120 #define OPT_GROUP(h)                { OPTION_GROUP, 0, NULL, NULL, NULL, (h) }
 121 #define OPT_BIT(s, l, v, h, b)      { OPTION_BIT, (s), (l), (v), NULL, (h), \
 122                                       PARSE_OPT_NOARG, NULL, (b) }
 123 #define OPT_NEGBIT(s, l, v, h, b)   { OPTION_NEGBIT, (s), (l), (v), NULL, \
 124                                       (h), PARSE_OPT_NOARG, NULL, (b) }
 125 #define OPT_BOOLEAN(s, l, v, h)     { OPTION_BOOLEAN, (s), (l), (v), NULL, \
 126                                       (h), PARSE_OPT_NOARG }
 127 #define OPT_SET_INT(s, l, v, h, i)  { OPTION_SET_INT, (s), (l), (v), NULL, \
 128                                       (h), PARSE_OPT_NOARG, NULL, (i) }
 129 #define OPT_SET_PTR(s, l, v, h, p)  { OPTION_SET_PTR, (s), (l), (v), NULL, \
 130                                       (h), PARSE_OPT_NOARG, NULL, (p) }
 131 #define OPT_INTEGER(s, l, v, h)     { OPTION_INTEGER, (s), (l), (v), "n", (h) }
 132 #define OPT_STRING(s, l, v, a, h)   { OPTION_STRING,  (s), (l), (v), (a), (h) }
 133 #define OPT_UYN(s, l, v, h)         { OPTION_CALLBACK, (s), (l), (v), NULL, \
 134                                       (h), PARSE_OPT_NOARG, &parse_opt_tertiary }
 135 #define OPT_DATE(s, l, v, h) \
 136         { OPTION_CALLBACK, (s), (l), (v), "time",(h), 0, \
 137           parse_opt_approxidate_cb }
 138 #define OPT_CALLBACK(s, l, v, a, h, f) \
 139         { OPTION_CALLBACK, (s), (l), (v), (a), (h), 0, (f) }
 140 #define OPT_NUMBER_CALLBACK(v, h, f) \
 141         { OPTION_NUMBER, 0, NULL, (v), NULL, (h), \
 142           PARSE_OPT_NOARG | PARSE_OPT_NONEG, (f) }
 143 #define OPT_FILENAME(s, l, v, h)    { OPTION_FILENAME, (s), (l), (v), \
 144                                        "file", (h) }
 145 #define OPT_COLOR_FLAG(s, l, v, h) \
 146         { OPTION_CALLBACK, (s), (l), (v), "when", (h), PARSE_OPT_OPTARG, \
 147                 parse_opt_color_flag_cb, (intptr_t)"always" }
 148
 149
 150 /* parse_options() will filter out the processed options and leave the
 151  * non-option arguments in argv[].
 152  * Returns the number of arguments left in argv[].
 153  */
 154 extern int parse_options(int argc, const char **argv, const char *prefix,
 155                          const struct option *options,
 156                          const char * const usagestr[], int flags);
 157
 158 extern NORETURN void usage_with_options(const char * const *usagestr,
 159                                         const struct option *options);
 160
 161 extern NORETURN void usage_msg_opt(const char *msg,
 162                                    const char * const *usagestr,
 163                                    const struct option *options);
 164
 165 /*----- incremental advanced APIs -----*/
 166
 167 enum {
 168         PARSE_OPT_HELP = -1,
 169         PARSE_OPT_DONE,
 170         PARSE_OPT_NON_OPTION,
 171         PARSE_OPT_UNKNOWN
 172 };
 173
 174 /*
 175  * It's okay for the caller to consume argv/argc in the usual way.
 176  * Other fields of that structure are private to parse-options and should not
 177  * be modified in any way.
 178  */
 179 struct parse_opt_ctx_t {
 180         const char **argv;
 181         const char **out;
 182         int argc, cpidx;
 183         const char *opt;
 184         int flags;
 185         const char *prefix;
 186 };
 187
 188 extern void parse_options_start(struct parse_opt_ctx_t *ctx,
 189                                 int argc, const char **argv, const char *prefix,
 190                                 const struct option *options, int flags);
 191
 192 extern int parse_options_step(struct parse_opt_ctx_t *ctx,
 193                               const struct option *options,
 194                               const char * const usagestr[]);
 195
 196 extern int parse_options_end(struct parse_opt_ctx_t *ctx);
 197
 198 extern int parse_options_concat(struct option *dst, size_t, struct option *src);
 199
 200 /*----- some often used options -----*/
 201 extern int parse_opt_abbrev_cb(const struct option *, const char *, int);
 202 extern int parse_opt_approxidate_cb(const struct option *, const char *, int);
 203 extern int parse_opt_color_flag_cb(const struct option *, const char *, int);
 204 extern int parse_opt_verbosity_cb(const struct option *, const char *, int);
 205 extern int parse_opt_with_commit(const struct option *, const char *, int);
 206 extern int parse_opt_tertiary(const struct option *, const char *, int);
 207
 208 #define OPT__VERBOSE(var, h)  OPT_BOOLEAN('v', "verbose", (var), (h))
 209 #define OPT__QUIET(var, h)    OPT_BOOLEAN('q', "quiet",   (var), (h))
 210 #define OPT__VERBOSITY(var) \
 211         { OPTION_CALLBACK, 'v', "verbose", (var), NULL, "be more verbose", \
 212           PARSE_OPT_NOARG, &parse_opt_verbosity_cb, 0 }, \
 213         { OPTION_CALLBACK, 'q', "quiet", (var), NULL, "be more quiet", \
 214           PARSE_OPT_NOARG, &parse_opt_verbosity_cb, 0 }
 215 #define OPT__DRY_RUN(var, h)  OPT_BOOLEAN('n', "dry-run", (var), (h))
 216 #define OPT__FORCE(var, h)    OPT_BOOLEAN('f', "force",   (var), (h))
 217 #define OPT__ABBREV(var)  \
 218         { OPTION_CALLBACK, 0, "abbrev", (var), "n", \
 219           "use <n> digits to display SHA-1s", \
 220           PARSE_OPT_OPTARG, &parse_opt_abbrev_cb, 0 }
 221 #define OPT__COLOR(var, h) \
 222         OPT_COLOR_FLAG(0, "color", (var), (h))
 223
 224 #endif