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         OPTION_ALIAS,
  11         /* options with no arguments */
  12         OPTION_BIT,
  13         OPTION_NEGBIT,
  14         OPTION_BITOP,
  15         OPTION_COUNTUP,
  16         OPTION_SET_INT,
  17         OPTION_CMDMODE,
  18         /* options with arguments (usually) */
  19         OPTION_STRING,
  20         OPTION_INTEGER,
  21         OPTION_MAGNITUDE,
  22         OPTION_CALLBACK,
  23         OPTION_LOWLEVEL_CALLBACK,
  24         OPTION_FILENAME
  25 };
  26
  27 enum parse_opt_flags {
  28         PARSE_OPT_KEEP_DASHDASH = 1,
  29         PARSE_OPT_STOP_AT_NON_OPTION = 2,
  30         PARSE_OPT_KEEP_ARGV0 = 4,
  31         PARSE_OPT_KEEP_UNKNOWN = 8,
  32         PARSE_OPT_NO_INTERNAL_HELP = 16,
  33         PARSE_OPT_ONE_SHOT = 32
  34 };
  35
  36 enum parse_opt_option_flags {
  37         PARSE_OPT_OPTARG  = 1,
  38         PARSE_OPT_NOARG   = 2,
  39         PARSE_OPT_NONEG   = 4,
  40         PARSE_OPT_HIDDEN  = 8,
  41         PARSE_OPT_LASTARG_DEFAULT = 16,
  42         PARSE_OPT_NODASH = 32,
  43         PARSE_OPT_LITERAL_ARGHELP = 64,
  44         PARSE_OPT_SHELL_EVAL = 256,
  45         PARSE_OPT_NOCOMPLETE = 512,
  46         PARSE_OPT_COMP_ARG = 1024
  47 };
  48
  49 struct option;
  50 typedef int parse_opt_cb(const struct option *, const char *arg, int unset);
  51
  52 struct parse_opt_ctx_t;
  53 typedef enum parse_opt_result parse_opt_ll_cb(struct parse_opt_ctx_t *ctx,
  54                                               const struct option *opt,
  55                                               const char *arg, int unset);
  56
  57 /*
  58  * `type`::
  59  *   holds the type of the option, you must have an OPTION_END last in your
  60  *   array.
  61  *
  62  * `short_name`::
  63  *   the character to use as a short option name, '\0' if none.
  64  *
  65  * `long_name`::
  66  *   the long option name, without the leading dashes, NULL if none.
  67  *
  68  * `value`::
  69  *   stores pointers to the values to be filled.
  70  *
  71  * `argh`::
  72  *   token to explain the kind of argument this option wants. Keep it
  73  *   homogeneous across the repository. Should be wrapped by N_() for
  74  *   translation.
  75  *
  76  * `help`::
  77  *   the short help associated to what the option does.
  78  *   Must never be NULL (except for OPTION_END).
  79  *   OPTION_GROUP uses this pointer to store the group header.
  80  *   Should be wrapped by N_() for translation.
  81  *
  82  * `flags`::
  83  *   mask of parse_opt_option_flags.
  84  *   PARSE_OPT_OPTARG: says that the argument is optional (not for BOOLEANs)
  85  *   PARSE_OPT_NOARG: says that this option does not take an argument
  86  *   PARSE_OPT_NONEG: says that this option cannot be negated
  87  *   PARSE_OPT_HIDDEN: this option is skipped in the default usage, and
  88  *                     shown only in the full usage.
  89  *   PARSE_OPT_LASTARG_DEFAULT: says that this option will take the default
  90  *                              value if no argument is given when the option
  91  *                              is last on the command line. If the option is
  92  *                              not last it will require an argument.
  93  *                              Should not be used with PARSE_OPT_OPTARG.
  94  *   PARSE_OPT_NODASH: this option doesn't start with a dash.
  95  *   PARSE_OPT_LITERAL_ARGHELP: says that argh shouldn't be enclosed in brackets
  96  *                              (i.e. '<argh>') in the help message.
  97  *                              Useful for options with multiple parameters.
  98  *   PARSE_OPT_NOCOMPLETE: by default all visible options are completable
  99  *                         by git-completion.bash. This option suppresses that.
 100  *   PARSE_OPT_COMP_ARG: this option forces to git-completion.bash to
 101  *                       complete an option as --name= not --name even if
 102  *                       the option takes optional argument.
 103  *
 104  * `callback`::
 105  *   pointer to the callback to use for OPTION_CALLBACK
 106  *
 107  * `defval`::
 108  *   default value to fill (*->value) with for PARSE_OPT_OPTARG.
 109  *   OPTION_{BIT,SET_INT} store the {mask,integer} to put in the value when met.
 110  *   CALLBACKS can use it like they want.
 111  *
 112  * `ll_callback`::
 113  *   pointer to the callback to use for OPTION_LOWLEVEL_CALLBACK
 114  *
 115  */
 116 struct option {
 117         enum parse_opt_type type;
 118         int short_name;
 119         const char *long_name;
 120         void *value;
 121         const char *argh;
 122         const char *help;
 123
 124         int flags;
 125         parse_opt_cb *callback;
 126         intptr_t defval;
 127         parse_opt_ll_cb *ll_callback;
 128         intptr_t extra;
 129 };
 130
 131 #define OPT_BIT_F(s, l, v, h, b, f) { OPTION_BIT, (s), (l), (v), NULL, (h), \
 132                                       PARSE_OPT_NOARG|(f), NULL, (b) }
 133 #define OPT_COUNTUP_F(s, l, v, h, f) { OPTION_COUNTUP, (s), (l), (v), NULL, \
 134                                        (h), PARSE_OPT_NOARG|(f) }
 135 #define OPT_SET_INT_F(s, l, v, h, i, f) { OPTION_SET_INT, (s), (l), (v), NULL, \
 136                                           (h), PARSE_OPT_NOARG | (f), NULL, (i) }
 137 #define OPT_BOOL_F(s, l, v, h, f)   OPT_SET_INT_F(s, l, v, h, 1, f)
 138 #define OPT_CALLBACK_F(s, l, v, a, h, f, cb)                    \
 139         { OPTION_CALLBACK, (s), (l), (v), (a), (h), (f), (cb) }
 140 #define OPT_STRING_F(s, l, v, a, h, f)   { OPTION_STRING,  (s), (l), (v), (a), (h), (f) }
 141 #define OPT_INTEGER_F(s, l, v, h, f)     { OPTION_INTEGER, (s), (l), (v), N_("n"), (h), (f) }
 142
 143 #define OPT_END()                   { OPTION_END }
 144 #define OPT_ARGUMENT(l, v, h)       { OPTION_ARGUMENT, 0, (l), (v), NULL, \
 145                                       (h), PARSE_OPT_NOARG, NULL, 1 }
 146 #define OPT_GROUP(h)                { OPTION_GROUP, 0, NULL, NULL, NULL, (h) }
 147 #define OPT_BIT(s, l, v, h, b)      OPT_BIT_F(s, l, v, h, b, 0)
 148 #define OPT_BITOP(s, l, v, h, set, clear) { OPTION_BITOP, (s), (l), (v), NULL, (h), \
 149                                             PARSE_OPT_NOARG|PARSE_OPT_NONEG, NULL, \
 150                                             (set), NULL, (clear) }
 151 #define OPT_NEGBIT(s, l, v, h, b)   { OPTION_NEGBIT, (s), (l), (v), NULL, \
 152                                       (h), PARSE_OPT_NOARG, NULL, (b) }
 153 #define OPT_COUNTUP(s, l, v, h)     OPT_COUNTUP_F(s, l, v, h, 0)
 154 #define OPT_SET_INT(s, l, v, h, i)  OPT_SET_INT_F(s, l, v, h, i, 0)
 155 #define OPT_BOOL(s, l, v, h)        OPT_BOOL_F(s, l, v, h, 0)
 156 #define OPT_HIDDEN_BOOL(s, l, v, h) { OPTION_SET_INT, (s), (l), (v), NULL, \
 157                                       (h), PARSE_OPT_NOARG | PARSE_OPT_HIDDEN, NULL, 1}
 158 #define OPT_CMDMODE(s, l, v, h, i)  { OPTION_CMDMODE, (s), (l), (v), NULL, \
 159                                       (h), PARSE_OPT_NOARG|PARSE_OPT_NONEG, NULL, (i) }
 160 #define OPT_INTEGER(s, l, v, h)     OPT_INTEGER_F(s, l, v, h, 0)
 161 #define OPT_MAGNITUDE(s, l, v, h)   { OPTION_MAGNITUDE, (s), (l), (v), \
 162                                       N_("n"), (h), PARSE_OPT_NONEG }
 163 #define OPT_STRING(s, l, v, a, h)   OPT_STRING_F(s, l, v, a, h, 0)
 164 #define OPT_STRING_LIST(s, l, v, a, h) \
 165                                     { OPTION_CALLBACK, (s), (l), (v), (a), \
 166                                       (h), 0, &parse_opt_string_list }
 167 #define OPT_UYN(s, l, v, h)         { OPTION_CALLBACK, (s), (l), (v), NULL, \
 168                                       (h), PARSE_OPT_NOARG, &parse_opt_tertiary }
 169 #define OPT_EXPIRY_DATE(s, l, v, h) \
 170         { OPTION_CALLBACK, (s), (l), (v), N_("expiry-date"),(h), 0,     \
 171           parse_opt_expiry_date_cb }
 172 #define OPT_CALLBACK(s, l, v, a, h, f) OPT_CALLBACK_F(s, l, v, a, h, 0, f)
 173 #define OPT_NUMBER_CALLBACK(v, h, f) \
 174         { OPTION_NUMBER, 0, NULL, (v), NULL, (h), \
 175           PARSE_OPT_NOARG | PARSE_OPT_NONEG, (f) }
 176 #define OPT_FILENAME(s, l, v, h)    { OPTION_FILENAME, (s), (l), (v), \
 177                                        N_("file"), (h) }
 178 #define OPT_COLOR_FLAG(s, l, v, h) \
 179         { OPTION_CALLBACK, (s), (l), (v), N_("when"), (h), PARSE_OPT_OPTARG, \
 180                 parse_opt_color_flag_cb, (intptr_t)"always" }
 181
 182 #define OPT_NOOP_NOARG(s, l) \
 183         { OPTION_CALLBACK, (s), (l), NULL, NULL, \
 184           N_("no-op (backward compatibility)"),         \
 185           PARSE_OPT_HIDDEN | PARSE_OPT_NOARG, parse_opt_noop_cb }
 186
 187 #define OPT_ALIAS(s, l, source_long_name) \
 188         { OPTION_ALIAS, (s), (l), (source_long_name) }
 189
 190 /*
 191  * parse_options() will filter out the processed options and leave the
 192  * non-option arguments in argv[]. argv0 is assumed program name and
 193  * skipped.
 194  *
 195  * usagestr strings should be marked for translation with N_().
 196  *
 197  * Returns the number of arguments left in argv[].
 198  *
 199  * In one-shot mode, argv0 is not a program name, argv[] is left
 200  * untouched and parse_options() returns the number of options
 201  * processed.
 202  */
 203 int parse_options(int argc, const char **argv, const char *prefix,
 204                   const struct option *options,
 205                   const char * const usagestr[], int flags);
 206
 207 NORETURN void usage_with_options(const char * const *usagestr,
 208                                  const struct option *options);
 209
 210 NORETURN void usage_msg_opt(const char *msg,
 211                             const char * const *usagestr,
 212                             const struct option *options);
 213
 214 int optbug(const struct option *opt, const char *reason);
 215 const char *optname(const struct option *opt, int flags);
 216
 217 /*
 218  * Use these assertions for callbacks that expect to be called with NONEG and
 219  * NOARG respectively, and do not otherwise handle the "unset" and "arg"
 220  * parameters.
 221  */
 222 #define BUG_ON_OPT_NEG(unset) do { \
 223         if ((unset)) \
 224                 BUG("option callback does not expect negation"); \
 225 } while (0)
 226 #define BUG_ON_OPT_ARG(arg) do { \
 227         if ((arg)) \
 228                 BUG("option callback does not expect an argument"); \
 229 } while (0)
 230
 231 /*
 232  * Similar to the assertions above, but checks that "arg" is always non-NULL.
 233  * This assertion also implies BUG_ON_OPT_NEG(), letting you declare both
 234  * assertions in a single line.
 235  */
 236 #define BUG_ON_OPT_NEG_NOARG(unset, arg) do { \
 237         BUG_ON_OPT_NEG(unset); \
 238         if(!(arg)) \
 239                 BUG("option callback expects an argument"); \
 240 } while(0)
 241
 242 /*----- incremental advanced APIs -----*/
 243
 244 enum parse_opt_result {
 245         PARSE_OPT_COMPLETE = -3,
 246         PARSE_OPT_HELP = -2,
 247         PARSE_OPT_ERROR = -1,   /* must be the same as error() */
 248         PARSE_OPT_DONE = 0,     /* fixed so that "return 0" works */
 249         PARSE_OPT_NON_OPTION,
 250         PARSE_OPT_UNKNOWN
 251 };
 252
 253 /*
 254  * It's okay for the caller to consume argv/argc in the usual way.
 255  * Other fields of that structure are private to parse-options and should not
 256  * be modified in any way.
 257  */
 258 struct parse_opt_ctx_t {
 259         const char **argv;
 260         const char **out;
 261         int argc, cpidx, total;
 262         const char *opt;
 263         int flags;
 264         const char *prefix;
 265         const char **alias_groups; /* must be in groups of 3 elements! */
 266         struct option *updated_options;
 267 };
 268
 269 void parse_options_start(struct parse_opt_ctx_t *ctx,
 270                          int argc, const char **argv, const char *prefix,
 271                          const struct option *options, int flags);
 272
 273 int parse_options_step(struct parse_opt_ctx_t *ctx,
 274                        const struct option *options,
 275                        const char * const usagestr[]);
 276
 277 int parse_options_end(struct parse_opt_ctx_t *ctx);
 278
 279 struct option *parse_options_dup(const struct option *a);
 280 struct option *parse_options_concat(struct option *a, struct option *b);
 281
 282 /*----- some often used options -----*/
 283 int parse_opt_abbrev_cb(const struct option *, const char *, int);
 284 int parse_opt_expiry_date_cb(const struct option *, const char *, int);
 285 int parse_opt_color_flag_cb(const struct option *, const char *, int);
 286 int parse_opt_verbosity_cb(const struct option *, const char *, int);
 287 /* value is struct oid_array* */
 288 int parse_opt_object_name(const struct option *, const char *, int);
 289 /* value is struct object_id* */
 290 int parse_opt_object_id(const struct option *, const char *, int);
 291 int parse_opt_commits(const struct option *, const char *, int);
 292 int parse_opt_commit(const struct option *, const char *, int);
 293 int parse_opt_tertiary(const struct option *, const char *, int);
 294 int parse_opt_string_list(const struct option *, const char *, int);
 295 int parse_opt_noop_cb(const struct option *, const char *, int);
 296 enum parse_opt_result parse_opt_unknown_cb(struct parse_opt_ctx_t *ctx,
 297                                            const struct option *,
 298                                            const char *, int);
 299 int parse_opt_passthru(const struct option *, const char *, int);
 300 int parse_opt_passthru_argv(const struct option *, const char *, int);
 301
 302 #define OPT__VERBOSE(var, h)  OPT_COUNTUP('v', "verbose", (var), (h))
 303 #define OPT__QUIET(var, h)    OPT_COUNTUP('q', "quiet",   (var), (h))
 304 #define OPT__VERBOSITY(var) \
 305         { OPTION_CALLBACK, 'v', "verbose", (var), NULL, N_("be more verbose"), \
 306           PARSE_OPT_NOARG, &parse_opt_verbosity_cb, 0 }, \
 307         { OPTION_CALLBACK, 'q', "quiet", (var), NULL, N_("be more quiet"), \
 308           PARSE_OPT_NOARG, &parse_opt_verbosity_cb, 0 }
 309 #define OPT__DRY_RUN(var, h)  OPT_BOOL('n', "dry-run", (var), (h))
 310 #define OPT__FORCE(var, h, f) OPT_COUNTUP_F('f', "force",   (var), (h), (f))
 311 #define OPT__ABBREV(var)  \
 312         { OPTION_CALLBACK, 0, "abbrev", (var), N_("n"), \
 313           N_("use <n> digits to display SHA-1s"),       \
 314           PARSE_OPT_OPTARG, &parse_opt_abbrev_cb, 0 }
 315 #define OPT__COLOR(var, h) \
 316         OPT_COLOR_FLAG(0, "color", (var), (h))
 317 #define OPT_COLUMN(s, l, v, h) \
 318         { OPTION_CALLBACK, (s), (l), (v), N_("style"), (h), PARSE_OPT_OPTARG, parseopt_column_callback }
 319 #define OPT_PASSTHRU(s, l, v, a, h, f) \
 320         { OPTION_CALLBACK, (s), (l), (v), (a), (h), (f), parse_opt_passthru }
 321 #define OPT_PASSTHRU_ARGV(s, l, v, a, h, f) \
 322         { OPTION_CALLBACK, (s), (l), (v), (a), (h), (f), parse_opt_passthru_argv }
 323 #define _OPT_CONTAINS_OR_WITH(name, variable, help, flag) \
 324         { OPTION_CALLBACK, 0, name, (variable), N_("commit"), (help), \
 325           PARSE_OPT_LASTARG_DEFAULT | flag, \
 326           parse_opt_commits, (intptr_t) "HEAD" \
 327         }
 328 #define OPT_CONTAINS(v, h) _OPT_CONTAINS_OR_WITH("contains", v, h, PARSE_OPT_NONEG)
 329 #define OPT_NO_CONTAINS(v, h) _OPT_CONTAINS_OR_WITH("no-contains", v, h, PARSE_OPT_NONEG)
 330 #define OPT_WITH(v, h) _OPT_CONTAINS_OR_WITH("with", v, h, PARSE_OPT_HIDDEN | PARSE_OPT_NONEG)
 331 #define OPT_WITHOUT(v, h) _OPT_CONTAINS_OR_WITH("without", v, h, PARSE_OPT_HIDDEN | PARSE_OPT_NONEG)
 332 #define OPT_CLEANUP(v) OPT_STRING(0, "cleanup", v, N_("mode"), N_("how to strip spaces and #comments from message"))
 333
 334 #endif