parse-options.h

   1 #ifndef PARSE_OPTIONS_H
   2 #define PARSE_OPTIONS_H
   3
   4 /**
   5  * Refer to Documentation/technical/api-parse-options.txt for the API doc.
   6  */
   7
   8 enum parse_opt_type {
   9         /* special types */
  10         OPTION_END,
  11         OPTION_GROUP,
  12         OPTION_NUMBER,
  13         OPTION_ALIAS,
  14         /* options with no arguments */
  15         OPTION_BIT,
  16         OPTION_NEGBIT,
  17         OPTION_BITOP,
  18         OPTION_COUNTUP,
  19         OPTION_SET_INT,
  20         /* options with arguments (usually) */
  21         OPTION_STRING,
  22         OPTION_INTEGER,
  23         OPTION_MAGNITUDE,
  24         OPTION_CALLBACK,
  25         OPTION_LOWLEVEL_CALLBACK,
  26         OPTION_FILENAME
  27 };
  28
  29 enum parse_opt_flags {
  30         PARSE_OPT_KEEP_DASHDASH = 1 << 0,
  31         PARSE_OPT_STOP_AT_NON_OPTION = 1 << 1,
  32         PARSE_OPT_KEEP_ARGV0 = 1 << 2,
  33         PARSE_OPT_KEEP_UNKNOWN = 1 << 3,
  34         PARSE_OPT_NO_INTERNAL_HELP = 1 << 4,
  35         PARSE_OPT_ONE_SHOT = 1 << 5,
  36         PARSE_OPT_SHELL_EVAL = 1 << 6,
  37 };
  38
  39 enum parse_opt_option_flags {
  40         PARSE_OPT_OPTARG  = 1 << 0,
  41         PARSE_OPT_NOARG   = 1 << 1,
  42         PARSE_OPT_NONEG   = 1 << 2,
  43         PARSE_OPT_HIDDEN  = 1 << 3,
  44         PARSE_OPT_LASTARG_DEFAULT = 1 << 4,
  45         PARSE_OPT_NODASH = 1 << 5,
  46         PARSE_OPT_LITERAL_ARGHELP = 1 << 6,
  47         PARSE_OPT_FROM_ALIAS = 1 << 7,
  48         PARSE_OPT_NOCOMPLETE = 1 << 9,
  49         PARSE_OPT_COMP_ARG = 1 << 10,
  50         PARSE_OPT_CMDMODE = 1 << 11,
  51 };
  52
  53 enum parse_opt_result {
  54         PARSE_OPT_COMPLETE = -3,
  55         PARSE_OPT_HELP = -2,
  56         PARSE_OPT_ERROR = -1,   /* must be the same as error() */
  57         PARSE_OPT_DONE = 0,     /* fixed so that "return 0" works */
  58         PARSE_OPT_NON_OPTION,
  59         PARSE_OPT_UNKNOWN
  60 };
  61
  62 struct option;
  63 typedef int parse_opt_cb(const struct option *, const char *arg, int unset);
  64
  65 struct parse_opt_ctx_t;
  66 typedef enum parse_opt_result parse_opt_ll_cb(struct parse_opt_ctx_t *ctx,
  67                                               const struct option *opt,
  68                                               const char *arg, int unset);
  69
  70 /*
  71  * `type`::
  72  *   holds the type of the option, you must have an OPTION_END last in your
  73  *   array.
  74  *
  75  * `short_name`::
  76  *   the character to use as a short option name, '\0' if none.
  77  *
  78  * `long_name`::
  79  *   the long option name, without the leading dashes, NULL if none.
  80  *
  81  * `value`::
  82  *   stores pointers to the values to be filled.
  83  *
  84  * `argh`::
  85  *   token to explain the kind of argument this option wants. Does not
  86  *   begin in capital letter, and does not end with a full stop.
  87  *   Should be wrapped by N_() for translation.
  88  *   Is automatically enclosed in brackets when printed, unless it
  89  *   contains any of the following characters: ()<>[]|
  90  *   E.g. "name" is shown as "<name>" to indicate that a name value
  91  *   needs to be supplied, not the literal string "name", but
  92  *   "<start>,<end>" and "(this|that)" are printed verbatim.
  93  *
  94  * `help`::
  95  *   the short help associated to what the option does.
  96  *   Must never be NULL (except for OPTION_END).
  97  *   OPTION_GROUP uses this pointer to store the group header.
  98  *   Should be wrapped by N_() for translation.
  99  *
 100  * `flags`::
 101  *   mask of parse_opt_option_flags.
 102  *   PARSE_OPT_OPTARG: says that the argument is optional (not for BOOLEANs)
 103  *   PARSE_OPT_NOARG: says that this option does not take an argument
 104  *   PARSE_OPT_NONEG: says that this option cannot be negated
 105  *   PARSE_OPT_HIDDEN: this option is skipped in the default usage, and
 106  *                     shown only in the full usage.
 107  *   PARSE_OPT_LASTARG_DEFAULT: says that this option will take the default
 108  *                              value if no argument is given when the option
 109  *                              is last on the command line. If the option is
 110  *                              not last it will require an argument.
 111  *                              Should not be used with PARSE_OPT_OPTARG.
 112  *   PARSE_OPT_NODASH: this option doesn't start with a dash.
 113  *   PARSE_OPT_LITERAL_ARGHELP: says that argh shouldn't be enclosed in brackets
 114  *                              (i.e. '<argh>') in the help message.
 115  *                              Useful for options with multiple parameters.
 116  *   PARSE_OPT_NOCOMPLETE: by default all visible options are completable
 117  *                         by git-completion.bash. This option suppresses that.
 118  *   PARSE_OPT_COMP_ARG: this option forces to git-completion.bash to
 119  *                       complete an option as --name= not --name even if
 120  *                       the option takes optional argument.
 121  *
 122  * `callback`::
 123  *   pointer to the callback to use for OPTION_CALLBACK
 124  *
 125  * `defval`::
 126  *   default value to fill (*->value) with for PARSE_OPT_OPTARG.
 127  *   OPTION_{BIT,SET_INT} store the {mask,integer} to put in the value when met.
 128  *   CALLBACKS can use it like they want.
 129  *
 130  * `ll_callback`::
 131  *   pointer to the callback to use for OPTION_LOWLEVEL_CALLBACK
 132  *
 133  */
 134 struct option {
 135         enum parse_opt_type type;
 136         int short_name;
 137         const char *long_name;
 138         void *value;
 139         const char *argh;
 140         const char *help;
 141
 142         enum parse_opt_option_flags flags;
 143         parse_opt_cb *callback;
 144         intptr_t defval;
 145         parse_opt_ll_cb *ll_callback;
 146         intptr_t extra;
 147 };
 148
 149 #define OPT_BIT_F(s, l, v, h, b, f) { OPTION_BIT, (s), (l), (v), NULL, (h), \
 150                                       PARSE_OPT_NOARG|(f), NULL, (b) }
 151 #define OPT_COUNTUP_F(s, l, v, h, f) { OPTION_COUNTUP, (s), (l), (v), NULL, \
 152                                        (h), PARSE_OPT_NOARG|(f) }
 153 #define OPT_SET_INT_F(s, l, v, h, i, f) { OPTION_SET_INT, (s), (l), (v), NULL, \
 154                                           (h), PARSE_OPT_NOARG | (f), NULL, (i) }
 155 #define OPT_BOOL_F(s, l, v, h, f)   OPT_SET_INT_F(s, l, v, h, 1, f)
 156 #define OPT_CALLBACK_F(s, l, v, a, h, f, cb)                    \
 157         { OPTION_CALLBACK, (s), (l), (v), (a), (h), (f), (cb) }
 158 #define OPT_STRING_F(s, l, v, a, h, f)   { OPTION_STRING,  (s), (l), (v), (a), (h), (f) }
 159 #define OPT_INTEGER_F(s, l, v, h, f)     { OPTION_INTEGER, (s), (l), (v), N_("n"), (h), (f) }
 160
 161 #define OPT_END()                   { OPTION_END }
 162 #define OPT_GROUP(h)                { OPTION_GROUP, 0, NULL, NULL, NULL, (h) }
 163 #define OPT_BIT(s, l, v, h, b)      OPT_BIT_F(s, l, v, h, b, 0)
 164 #define OPT_BITOP(s, l, v, h, set, clear) { OPTION_BITOP, (s), (l), (v), NULL, (h), \
 165                                             PARSE_OPT_NOARG|PARSE_OPT_NONEG, NULL, \
 166                                             (set), NULL, (clear) }
 167 #define OPT_NEGBIT(s, l, v, h, b)   { OPTION_NEGBIT, (s), (l), (v), NULL, \
 168                                       (h), PARSE_OPT_NOARG, NULL, (b) }
 169 #define OPT_COUNTUP(s, l, v, h)     OPT_COUNTUP_F(s, l, v, h, 0)
 170 #define OPT_SET_INT(s, l, v, h, i)  OPT_SET_INT_F(s, l, v, h, i, 0)
 171 #define OPT_BOOL(s, l, v, h)        OPT_BOOL_F(s, l, v, h, 0)
 172 #define OPT_HIDDEN_BOOL(s, l, v, h) { OPTION_SET_INT, (s), (l), (v), NULL, \
 173                                       (h), PARSE_OPT_NOARG | PARSE_OPT_HIDDEN, NULL, 1}
 174 #define OPT_CMDMODE_F(s, l, v, h, i, f)  { OPTION_SET_INT, (s), (l), (v), NULL, \
 175                                       (h), PARSE_OPT_CMDMODE|PARSE_OPT_NOARG|PARSE_OPT_NONEG | (f), NULL, (i) }
 176 #define OPT_CMDMODE(s, l, v, h, i)  OPT_CMDMODE_F(s, l, v, h, i, 0)
 177
 178 #define OPT_INTEGER(s, l, v, h)     OPT_INTEGER_F(s, l, v, h, 0)
 179 #define OPT_MAGNITUDE(s, l, v, h)   { OPTION_MAGNITUDE, (s), (l), (v), \
 180                                       N_("n"), (h), PARSE_OPT_NONEG }
 181 #define OPT_STRING(s, l, v, a, h)   OPT_STRING_F(s, l, v, a, h, 0)
 182 #define OPT_STRING_LIST(s, l, v, a, h) \
 183                                     { OPTION_CALLBACK, (s), (l), (v), (a), \
 184                                       (h), 0, &parse_opt_string_list }
 185 #define OPT_UYN(s, l, v, h)         { OPTION_CALLBACK, (s), (l), (v), NULL, \
 186                                       (h), PARSE_OPT_NOARG, &parse_opt_tertiary }
 187 #define OPT_EXPIRY_DATE(s, l, v, h) \
 188         { OPTION_CALLBACK, (s), (l), (v), N_("expiry-date"),(h), 0,     \
 189           parse_opt_expiry_date_cb }
 190 #define OPT_CALLBACK(s, l, v, a, h, f) OPT_CALLBACK_F(s, l, v, a, h, 0, f)
 191 #define OPT_NUMBER_CALLBACK(v, h, f) \
 192         { OPTION_NUMBER, 0, NULL, (v), NULL, (h), \
 193           PARSE_OPT_NOARG | PARSE_OPT_NONEG, (f) }
 194 #define OPT_FILENAME(s, l, v, h)    { OPTION_FILENAME, (s), (l), (v), \
 195                                        N_("file"), (h) }
 196 #define OPT_COLOR_FLAG(s, l, v, h) \
 197         { OPTION_CALLBACK, (s), (l), (v), N_("when"), (h), PARSE_OPT_OPTARG, \
 198                 parse_opt_color_flag_cb, (intptr_t)"always" }
 199
 200 #define OPT_NOOP_NOARG(s, l) \
 201         { OPTION_CALLBACK, (s), (l), NULL, NULL, \
 202           N_("no-op (backward compatibility)"),         \
 203           PARSE_OPT_HIDDEN | PARSE_OPT_NOARG, parse_opt_noop_cb }
 204
 205 #define OPT_ALIAS(s, l, source_long_name) \
 206         { OPTION_ALIAS, (s), (l), (source_long_name) }
 207
 208 /*
 209  * parse_options() will filter out the processed options and leave the
 210  * non-option arguments in argv[]. argv0 is assumed program name and
 211  * skipped.
 212  *
 213  * usagestr strings should be marked for translation with N_().
 214  *
 215  * Returns the number of arguments left in argv[].
 216  *
 217  * In one-shot mode, argv0 is not a program name, argv[] is left
 218  * untouched and parse_options() returns the number of options
 219  * processed.
 220  */
 221 int parse_options(int argc, const char **argv, const char *prefix,
 222                   const struct option *options,
 223                   const char * const usagestr[],
 224                   enum parse_opt_flags flags);
 225
 226 NORETURN void usage_with_options(const char * const *usagestr,
 227                                  const struct option *options);
 228
 229 NORETURN void usage_msg_opt(const char *msg,
 230                             const char * const *usagestr,
 231                             const struct option *options);
 232
 233 /**
 234  * usage_msg_optf() is like usage_msg_opt() except that the first
 235  * argument is a format string, and optional format arguments follow
 236  * after the 3rd option.
 237  */
 238 __attribute__((format (printf,1,4)))
 239 void NORETURN usage_msg_optf(const char *fmt,
 240                              const char * const *usagestr,
 241                              const struct option *options, ...);
 242
 243 /*
 244  * Use these assertions for callbacks that expect to be called with NONEG and
 245  * NOARG respectively, and do not otherwise handle the "unset" and "arg"
 246  * parameters.
 247  */
 248 #define BUG_ON_OPT_NEG(unset) do { \
 249         if ((unset)) \
 250                 BUG("option callback does not expect negation"); \
 251 } while (0)
 252 #define BUG_ON_OPT_ARG(arg) do { \
 253         if ((arg)) \
 254                 BUG("option callback does not expect an argument"); \
 255 } while (0)
 256
 257 /*
 258  * Similar to the assertions above, but checks that "arg" is always non-NULL.
 259  * This assertion also implies BUG_ON_OPT_NEG(), letting you declare both
 260  * assertions in a single line.
 261  */
 262 #define BUG_ON_OPT_NEG_NOARG(unset, arg) do { \
 263         BUG_ON_OPT_NEG(unset); \
 264         if(!(arg)) \
 265                 BUG("option callback expects an argument"); \
 266 } while(0)
 267
 268 /*----- incremental advanced APIs -----*/
 269
 270 /*
 271  * It's okay for the caller to consume argv/argc in the usual way.
 272  * Other fields of that structure are private to parse-options and should not
 273  * be modified in any way.
 274  */
 275 struct parse_opt_ctx_t {
 276         const char **argv;
 277         const char **out;
 278         int argc, cpidx, total;
 279         const char *opt;
 280         enum parse_opt_flags flags;
 281         const char *prefix;
 282         const char **alias_groups; /* must be in groups of 3 elements! */
 283         struct option *updated_options;
 284 };
 285
 286 void parse_options_start(struct parse_opt_ctx_t *ctx,
 287                          int argc, const char **argv, const char *prefix,
 288                          const struct option *options,
 289                          enum parse_opt_flags flags);
 290
 291 enum parse_opt_result parse_options_step(struct parse_opt_ctx_t *ctx,
 292                                          const struct option *options,
 293                                          const char * const usagestr[]);
 294
 295 int parse_options_end(struct parse_opt_ctx_t *ctx);
 296
 297 struct option *parse_options_dup(const struct option *a);
 298 struct option *parse_options_concat(const struct option *a, const struct option *b);
 299
 300 /*----- some often used options -----*/
 301 int parse_opt_abbrev_cb(const struct option *, const char *, int);
 302 int parse_opt_expiry_date_cb(const struct option *, const char *, int);
 303 int parse_opt_color_flag_cb(const struct option *, const char *, int);
 304 int parse_opt_verbosity_cb(const struct option *, const char *, int);
 305 /* value is struct oid_array* */
 306 int parse_opt_object_name(const struct option *, const char *, int);
 307 /* value is struct object_id* */
 308 int parse_opt_object_id(const struct option *, const char *, int);
 309 int parse_opt_commits(const struct option *, const char *, int);
 310 int parse_opt_commit(const struct option *, const char *, int);
 311 int parse_opt_tertiary(const struct option *, const char *, int);
 312 int parse_opt_string_list(const struct option *, const char *, int);
 313 int parse_opt_noop_cb(const struct option *, const char *, int);
 314 enum parse_opt_result parse_opt_unknown_cb(struct parse_opt_ctx_t *ctx,
 315                                            const struct option *,
 316                                            const char *, int);
 317 int parse_opt_passthru(const struct option *, const char *, int);
 318 int parse_opt_passthru_argv(const struct option *, const char *, int);
 319 /* value is enum branch_track* */
 320 int parse_opt_tracking_mode(const struct option *, const char *, int);
 321
 322 #define OPT__VERBOSE(var, h)  OPT_COUNTUP('v', "verbose", (var), (h))
 323 #define OPT__QUIET(var, h)    OPT_COUNTUP('q', "quiet",   (var), (h))
 324 #define OPT__VERBOSITY(var) \
 325         { OPTION_CALLBACK, 'v', "verbose", (var), NULL, N_("be more verbose"), \
 326           PARSE_OPT_NOARG, &parse_opt_verbosity_cb, 0 }, \
 327         { OPTION_CALLBACK, 'q', "quiet", (var), NULL, N_("be more quiet"), \
 328           PARSE_OPT_NOARG, &parse_opt_verbosity_cb, 0 }
 329 #define OPT__DRY_RUN(var, h)  OPT_BOOL('n', "dry-run", (var), (h))
 330 #define OPT__FORCE(var, h, f) OPT_COUNTUP_F('f', "force",   (var), (h), (f))
 331 #define OPT__ABBREV(var)  \
 332         { OPTION_CALLBACK, 0, "abbrev", (var), N_("n"), \
 333           N_("use <n> digits to display object names"), \
 334           PARSE_OPT_OPTARG, &parse_opt_abbrev_cb, 0 }
 335 #define OPT__COLOR(var, h) \
 336         OPT_COLOR_FLAG(0, "color", (var), (h))
 337 #define OPT_COLUMN(s, l, v, h) \
 338         { OPTION_CALLBACK, (s), (l), (v), N_("style"), (h), PARSE_OPT_OPTARG, parseopt_column_callback }
 339 #define OPT_PASSTHRU(s, l, v, a, h, f) \
 340         { OPTION_CALLBACK, (s), (l), (v), (a), (h), (f), parse_opt_passthru }
 341 #define OPT_PASSTHRU_ARGV(s, l, v, a, h, f) \
 342         { OPTION_CALLBACK, (s), (l), (v), (a), (h), (f), parse_opt_passthru_argv }
 343 #define _OPT_CONTAINS_OR_WITH(name, variable, help, flag) \
 344         { OPTION_CALLBACK, 0, name, (variable), N_("commit"), (help), \
 345           PARSE_OPT_LASTARG_DEFAULT | flag, \
 346           parse_opt_commits, (intptr_t) "HEAD" \
 347         }
 348 #define OPT_CONTAINS(v, h) _OPT_CONTAINS_OR_WITH("contains", v, h, PARSE_OPT_NONEG)
 349 #define OPT_NO_CONTAINS(v, h) _OPT_CONTAINS_OR_WITH("no-contains", v, h, PARSE_OPT_NONEG)
 350 #define OPT_WITH(v, h) _OPT_CONTAINS_OR_WITH("with", v, h, PARSE_OPT_HIDDEN | PARSE_OPT_NONEG)
 351 #define OPT_WITHOUT(v, h) _OPT_CONTAINS_OR_WITH("without", v, h, PARSE_OPT_HIDDEN | PARSE_OPT_NONEG)
 352 #define OPT_CLEANUP(v) OPT_STRING(0, "cleanup", v, N_("mode"), N_("how to strip spaces and #comments from message"))
 353 #define OPT_PATHSPEC_FROM_FILE(v) OPT_FILENAME(0, "pathspec-from-file", v, N_("read pathspec from file"))
 354 #define OPT_PATHSPEC_FILE_NUL(v)  OPT_BOOL(0, "pathspec-file-nul", v, N_("with --pathspec-from-file, pathspec elements are separated with NUL character"))
 355 #define OPT_AUTOSTASH(v) OPT_BOOL(0, "autostash", v, N_("automatically stash/stash pop before and after"))
 356
 357 #endif