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_COUNTUP,
  14         OPTION_SET_INT,
  15         OPTION_CMDMODE,
  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_SHELL_EVAL = 256
  41 };
  42
  43 struct option;
  44 typedef int parse_opt_cb(const struct option *, const char *arg, int unset);
  45
  46 struct parse_opt_ctx_t;
  47 typedef int parse_opt_ll_cb(struct parse_opt_ctx_t *ctx,
  48                                 const struct option *opt, int unset);
  49
  50 /*
  51  * `type`::
  52  *   holds the type of the option, you must have an OPTION_END last in your
  53  *   array.
  54  *
  55  * `short_name`::
  56  *   the character to use as a short option name, '\0' if none.
  57  *
  58  * `long_name`::
  59  *   the long option name, without the leading dashes, NULL if none.
  60  *
  61  * `value`::
  62  *   stores pointers to the values to be filled.
  63  *
  64  * `argh`::
  65  *   token to explain the kind of argument this option wants. Keep it
  66  *   homogeneous across the repository. Should be wrapped by N_() for
  67  *   translation.
  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  *   Should be wrapped by N_() for translation.
  74  *
  75  * `flags`::
  76  *   mask of parse_opt_option_flags.
  77  *   PARSE_OPT_OPTARG: says that the argument is optional (not for BOOLEANs)
  78  *   PARSE_OPT_NOARG: says that this option does not take an argument
  79  *   PARSE_OPT_NONEG: says that this option cannot be negated
  80  *   PARSE_OPT_HIDDEN: this option is skipped in the default usage, and
  81  *                     shown only in the full usage.
  82  *   PARSE_OPT_LASTARG_DEFAULT: says that this option will take the default
  83  *                              value if no argument is given when the option
  84  *                              is last on the command line. If the option is
  85  *                              not last it will require an argument.
  86  *                              Should not be used with PARSE_OPT_OPTARG.
  87  *   PARSE_OPT_NODASH: this option doesn't start with a dash.
  88  *   PARSE_OPT_LITERAL_ARGHELP: says that argh shouldn't be enclosed in brackets
  89  *                              (i.e. '<argh>') in the help message.
  90  *                              Useful for options with multiple parameters.
  91  *
  92  * `callback`::
  93  *   pointer to the callback to use for OPTION_CALLBACK or
  94  *   OPTION_LOWLEVEL_CALLBACK.
  95  *
  96  * `defval`::
  97  *   default value to fill (*->value) with for PARSE_OPT_OPTARG.
  98  *   OPTION_{BIT,SET_INT} store the {mask,integer} to put in the value when met.
  99  *   CALLBACKS can use it like they want.
 100  */
 101 struct option {
 102         enum parse_opt_type type;
 103         int short_name;
 104         const char *long_name;
 105         void *value;
 106         const char *argh;
 107         const char *help;
 108
 109         int flags;
 110         parse_opt_cb *callback;
 111         intptr_t defval;
 112 };
 113
 114 #define OPT_END()                   { OPTION_END }
 115 #define OPT_ARGUMENT(l, h)          { OPTION_ARGUMENT, 0, (l), NULL, NULL, \
 116                                       (h), PARSE_OPT_NOARG}
 117 #define OPT_GROUP(h)                { OPTION_GROUP, 0, NULL, NULL, NULL, (h) }
 118 #define OPT_BIT(s, l, v, h, b)      { OPTION_BIT, (s), (l), (v), NULL, (h), \
 119                                       PARSE_OPT_NOARG, NULL, (b) }
 120 #define OPT_NEGBIT(s, l, v, h, b)   { OPTION_NEGBIT, (s), (l), (v), NULL, \
 121                                       (h), PARSE_OPT_NOARG, NULL, (b) }
 122 #define OPT_COUNTUP(s, l, v, h)     { OPTION_COUNTUP, (s), (l), (v), NULL, \
 123                                       (h), PARSE_OPT_NOARG }
 124 #define OPT_SET_INT(s, l, v, h, i)  { OPTION_SET_INT, (s), (l), (v), NULL, \
 125                                       (h), PARSE_OPT_NOARG, NULL, (i) }
 126 #define OPT_BOOL(s, l, v, h)        OPT_SET_INT(s, l, v, h, 1)
 127 #define OPT_HIDDEN_BOOL(s, l, v, h) { OPTION_SET_INT, (s), (l), (v), NULL, \
 128                                       (h), PARSE_OPT_NOARG | PARSE_OPT_HIDDEN, NULL, 1}
 129 #define OPT_CMDMODE(s, l, v, h, i) { OPTION_CMDMODE, (s), (l), (v), NULL, \
 130                                       (h), PARSE_OPT_NOARG|PARSE_OPT_NONEG, NULL, (i) }
 131 #define OPT_INTEGER(s, l, v, h)     { OPTION_INTEGER, (s), (l), (v), N_("n"), (h) }
 132 #define OPT_STRING(s, l, v, a, h)   { OPTION_STRING,  (s), (l), (v), (a), (h) }
 133 #define OPT_STRING_LIST(s, l, v, a, h) \
 134                                     { OPTION_CALLBACK, (s), (l), (v), (a), \
 135                                       (h), 0, &parse_opt_string_list }
 136 #define OPT_UYN(s, l, v, h)         { OPTION_CALLBACK, (s), (l), (v), NULL, \
 137                                       (h), PARSE_OPT_NOARG, &parse_opt_tertiary }
 138 #define OPT_DATE(s, l, v, h) \
 139         { OPTION_CALLBACK, (s), (l), (v), N_("time"),(h), 0,    \
 140           parse_opt_approxidate_cb }
 141 #define OPT_EXPIRY_DATE(s, l, v, h) \
 142         { OPTION_CALLBACK, (s), (l), (v), N_("expiry-date"),(h), 0,     \
 143           parse_opt_expiry_date_cb }
 144 #define OPT_CALLBACK(s, l, v, a, h, f) \
 145         { OPTION_CALLBACK, (s), (l), (v), (a), (h), 0, (f) }
 146 #define OPT_NUMBER_CALLBACK(v, h, f) \
 147         { OPTION_NUMBER, 0, NULL, (v), NULL, (h), \
 148           PARSE_OPT_NOARG | PARSE_OPT_NONEG, (f) }
 149 #define OPT_FILENAME(s, l, v, h)    { OPTION_FILENAME, (s), (l), (v), \
 150                                        N_("file"), (h) }
 151 #define OPT_COLOR_FLAG(s, l, v, h) \
 152         { OPTION_CALLBACK, (s), (l), (v), N_("when"), (h), PARSE_OPT_OPTARG, \
 153                 parse_opt_color_flag_cb, (intptr_t)"always" }
 154
 155 #define OPT_NOOP_NOARG(s, l) \
 156         { OPTION_CALLBACK, (s), (l), NULL, NULL, \
 157           N_("no-op (backward compatibility)"),         \
 158           PARSE_OPT_HIDDEN | PARSE_OPT_NOARG, parse_opt_noop_cb }
 159
 160 /* parse_options() will filter out the processed options and leave the
 161  * non-option arguments in argv[]. usagestr strings should be marked
 162  * for translation with N_().
 163  * Returns the number of arguments left in argv[].
 164  */
 165 extern int parse_options(int argc, const char **argv, const char *prefix,
 166                          const struct option *options,
 167                          const char * const usagestr[], int flags);
 168
 169 extern NORETURN void usage_with_options(const char * const *usagestr,
 170                                         const struct option *options);
 171
 172 extern NORETURN void usage_msg_opt(const char *msg,
 173                                    const char * const *usagestr,
 174                                    const struct option *options);
 175
 176 extern int optbug(const struct option *opt, const char *reason);
 177 extern int opterror(const struct option *opt, const char *reason, int flags);
 178 #if defined(__GNUC__)
 179 #define opterror(o,r,f) (opterror((o),(r),(f)), const_error())
 180 #endif
 181
 182 /*----- incremental advanced APIs -----*/
 183
 184 enum {
 185         PARSE_OPT_HELP = -1,
 186         PARSE_OPT_DONE,
 187         PARSE_OPT_NON_OPTION,
 188         PARSE_OPT_UNKNOWN
 189 };
 190
 191 /*
 192  * It's okay for the caller to consume argv/argc in the usual way.
 193  * Other fields of that structure are private to parse-options and should not
 194  * be modified in any way.
 195  */
 196 struct parse_opt_ctx_t {
 197         const char **argv;
 198         const char **out;
 199         int argc, cpidx;
 200         const char *opt;
 201         int flags;
 202         const char *prefix;
 203 };
 204
 205 extern void parse_options_start(struct parse_opt_ctx_t *ctx,
 206                                 int argc, const char **argv, const char *prefix,
 207                                 const struct option *options, int flags);
 208
 209 extern int parse_options_step(struct parse_opt_ctx_t *ctx,
 210                               const struct option *options,
 211                               const char * const usagestr[]);
 212
 213 extern int parse_options_end(struct parse_opt_ctx_t *ctx);
 214
 215 extern int parse_options_concat(struct option *dst, size_t, struct option *src);
 216
 217 /*----- some often used options -----*/
 218 extern int parse_opt_abbrev_cb(const struct option *, const char *, int);
 219 extern int parse_opt_approxidate_cb(const struct option *, const char *, int);
 220 extern int parse_opt_expiry_date_cb(const struct option *, const char *, int);
 221 extern int parse_opt_color_flag_cb(const struct option *, const char *, int);
 222 extern int parse_opt_verbosity_cb(const struct option *, const char *, int);
 223 extern int parse_opt_with_commit(const struct option *, const char *, int);
 224 extern int parse_opt_tertiary(const struct option *, const char *, int);
 225 extern int parse_opt_string_list(const struct option *, const char *, int);
 226 extern int parse_opt_noop_cb(const struct option *, const char *, int);
 227
 228 #define OPT__VERBOSE(var, h)  OPT_COUNTUP('v', "verbose", (var), (h))
 229 #define OPT__QUIET(var, h)    OPT_COUNTUP('q', "quiet",   (var), (h))
 230 #define OPT__VERBOSITY(var) \
 231         { OPTION_CALLBACK, 'v', "verbose", (var), NULL, N_("be more verbose"), \
 232           PARSE_OPT_NOARG, &parse_opt_verbosity_cb, 0 }, \
 233         { OPTION_CALLBACK, 'q', "quiet", (var), NULL, N_("be more quiet"), \
 234           PARSE_OPT_NOARG, &parse_opt_verbosity_cb, 0 }
 235 #define OPT__DRY_RUN(var, h)  OPT_BOOL('n', "dry-run", (var), (h))
 236 #define OPT__FORCE(var, h)    OPT_COUNTUP('f', "force",   (var), (h))
 237 #define OPT__ABBREV(var)  \
 238         { OPTION_CALLBACK, 0, "abbrev", (var), N_("n"), \
 239           N_("use <n> digits to display SHA-1s"),       \
 240           PARSE_OPT_OPTARG, &parse_opt_abbrev_cb, 0 }
 241 #define OPT__COLOR(var, h) \
 242         OPT_COLOR_FLAG(0, "color", (var), (h))
 243 #define OPT_COLUMN(s, l, v, h) \
 244         { OPTION_CALLBACK, (s), (l), (v), N_("style"), (h), PARSE_OPT_OPTARG, parseopt_column_callback }
 245
 246 #endif