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