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_SET_PTR,
  16         OPTION_CMDMODE,
  17         /* options with arguments (usually) */
  18         OPTION_STRING,
  19         OPTION_INTEGER,
  20         OPTION_CALLBACK,
  21         OPTION_LOWLEVEL_CALLBACK,
  22         OPTION_FILENAME
  23 };
  24
  25 /* Deprecated synonym */
  26 #define OPTION_BOOLEAN OPTION_COUNTUP
  27
  28 enum parse_opt_flags {
  29         PARSE_OPT_KEEP_DASHDASH = 1,
  30         PARSE_OPT_STOP_AT_NON_OPTION = 2,
  31         PARSE_OPT_KEEP_ARGV0 = 4,
  32         PARSE_OPT_KEEP_UNKNOWN = 8,
  33         PARSE_OPT_NO_INTERNAL_HELP = 16
  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 };
  46
  47 struct option;
  48 typedef int parse_opt_cb(const struct option *, const char *arg, int unset);
  49
  50 struct parse_opt_ctx_t;
  51 typedef int parse_opt_ll_cb(struct parse_opt_ctx_t *ctx,
  52                                 const struct option *opt, int unset);
  53
  54 /*
  55  * `type`::
  56  *   holds the type of the option, you must have an OPTION_END last in your
  57  *   array.
  58  *
  59  * `short_name`::
  60  *   the character to use as a short option name, '\0' if none.
  61  *
  62  * `long_name`::
  63  *   the long option name, without the leading dashes, NULL if none.
  64  *
  65  * `value`::
  66  *   stores pointers to the values to be filled.
  67  *
  68  * `argh`::
  69  *   token to explain the kind of argument this option wants. Keep it
  70  *   homogeneous across the repository. Should be wrapped by N_() for
  71  *   translation.
  72  *
  73  * `help`::
  74  *   the short help associated to what the option does.
  75  *   Must never be NULL (except for OPTION_END).
  76  *   OPTION_GROUP uses this pointer to store the group header.
  77  *   Should be wrapped by N_() for translation.
  78  *
  79  * `flags`::
  80  *   mask of parse_opt_option_flags.
  81  *   PARSE_OPT_OPTARG: says that the argument is optional (not for BOOLEANs)
  82  *   PARSE_OPT_NOARG: says that this option does not take an argument
  83  *   PARSE_OPT_NONEG: says that this option cannot be negated
  84  *   PARSE_OPT_HIDDEN: this option is skipped in the default usage, and
  85  *                     shown only in the full usage.
  86  *   PARSE_OPT_LASTARG_DEFAULT: says that this option will take the default
  87  *                              value if no argument is given when the option
  88  *                              is last on the command line. If the option is
  89  *                              not last it will require an argument.
  90  *                              Should not be used with PARSE_OPT_OPTARG.
  91  *   PARSE_OPT_NODASH: this option doesn't start with a dash.
  92  *   PARSE_OPT_LITERAL_ARGHELP: says that argh shouldn't be enclosed in brackets
  93  *                              (i.e. '<argh>') in the help message.
  94  *                              Useful for options with multiple parameters.
  95  *
  96  * `callback`::
  97  *   pointer to the callback to use for OPTION_CALLBACK or
  98  *   OPTION_LOWLEVEL_CALLBACK.
  99  *
 100  * `defval`::
 101  *   default value to fill (*->value) with for PARSE_OPT_OPTARG.
 102  *   OPTION_{BIT,SET_INT,SET_PTR} store the {mask,integer,pointer} to put in
 103  *   the value when met.
 104  *   CALLBACKS can use it like they want.
 105  */
 106 struct option {
 107         enum parse_opt_type type;
 108         int short_name;
 109         const char *long_name;
 110         void *value;
 111         const char *argh;
 112         const char *help;
 113
 114         int flags;
 115         parse_opt_cb *callback;
 116         intptr_t defval;
 117 };
 118
 119 #define OPT_END()                   { OPTION_END }
 120 #define OPT_ARGUMENT(l, h)          { OPTION_ARGUMENT, 0, (l), NULL, NULL, \
 121                                       (h), PARSE_OPT_NOARG}
 122 #define OPT_GROUP(h)                { OPTION_GROUP, 0, NULL, NULL, NULL, (h) }
 123 #define OPT_BIT(s, l, v, h, b)      { OPTION_BIT, (s), (l), (v), NULL, (h), \
 124                                       PARSE_OPT_NOARG, NULL, (b) }
 125 #define OPT_NEGBIT(s, l, v, h, b)   { OPTION_NEGBIT, (s), (l), (v), NULL, \
 126                                       (h), PARSE_OPT_NOARG, NULL, (b) }
 127 #define OPT_COUNTUP(s, l, v, h)     { OPTION_COUNTUP, (s), (l), (v), NULL, \
 128                                       (h), PARSE_OPT_NOARG }
 129 #define OPT_SET_INT(s, l, v, h, i)  { OPTION_SET_INT, (s), (l), (v), NULL, \
 130                                       (h), PARSE_OPT_NOARG, NULL, (i) }
 131 #define OPT_BOOL(s, l, v, h)        OPT_SET_INT(s, l, v, h, 1)
 132 #define OPT_SET_PTR(s, l, v, h, p)  { OPTION_SET_PTR, (s), (l), (v), NULL, \
 133                                       (h), PARSE_OPT_NOARG, NULL, (p) }
 134 #define OPT_CMDMODE(s, l, v, h, i) { OPTION_CMDMODE, (s), (l), (v), NULL, \
 135                                       (h), PARSE_OPT_NOARG|PARSE_OPT_NONEG, NULL, (i) }
 136 #define OPT_INTEGER(s, l, v, h)     { OPTION_INTEGER, (s), (l), (v), N_("n"), (h) }
 137 #define OPT_STRING(s, l, v, a, h)   { OPTION_STRING,  (s), (l), (v), (a), (h) }
 138 #define OPT_STRING_LIST(s, l, v, a, h) \
 139                                     { OPTION_CALLBACK, (s), (l), (v), (a), \
 140                                       (h), 0, &parse_opt_string_list }
 141 #define OPT_UYN(s, l, v, h)         { OPTION_CALLBACK, (s), (l), (v), NULL, \
 142                                       (h), PARSE_OPT_NOARG, &parse_opt_tertiary }
 143 #define OPT_DATE(s, l, v, h) \
 144         { OPTION_CALLBACK, (s), (l), (v), N_("time"),(h), 0,    \
 145           parse_opt_approxidate_cb }
 146 #define OPT_EXPIRY_DATE(s, l, v, h) \
 147         { OPTION_CALLBACK, (s), (l), (v), N_("expiry date"),(h), 0,     \
 148           parse_opt_expiry_date_cb }
 149 #define OPT_CALLBACK(s, l, v, a, h, f) \
 150         { OPTION_CALLBACK, (s), (l), (v), (a), (h), 0, (f) }
 151 #define OPT_NUMBER_CALLBACK(v, h, f) \
 152         { OPTION_NUMBER, 0, NULL, (v), NULL, (h), \
 153           PARSE_OPT_NOARG | PARSE_OPT_NONEG, (f) }
 154 #define OPT_FILENAME(s, l, v, h)    { OPTION_FILENAME, (s), (l), (v), \
 155                                        N_("file"), (h) }
 156 #define OPT_COLOR_FLAG(s, l, v, h) \
 157         { OPTION_CALLBACK, (s), (l), (v), N_("when"), (h), PARSE_OPT_OPTARG, \
 158                 parse_opt_color_flag_cb, (intptr_t)"always" }
 159
 160 #define OPT_NOOP_NOARG(s, l) \
 161         { OPTION_CALLBACK, (s), (l), NULL, NULL, \
 162           N_("no-op (backward compatibility)"),         \
 163           PARSE_OPT_HIDDEN | PARSE_OPT_NOARG, parse_opt_noop_cb }
 164
 165 /* Deprecated synonym */
 166 #define OPT_BOOLEAN OPT_COUNTUP
 167
 168 /* parse_options() will filter out the processed options and leave the
 169  * non-option arguments in argv[]. usagestr strings should be marked
 170  * for translation with N_().
 171  * Returns the number of arguments left in argv[].
 172  */
 173 extern int parse_options(int argc, const char **argv, const char *prefix,
 174                          const struct option *options,
 175                          const char * const usagestr[], int flags);
 176
 177 extern NORETURN void usage_with_options(const char * const *usagestr,
 178                                         const struct option *options);
 179
 180 extern NORETURN void usage_msg_opt(const char *msg,
 181                                    const char * const *usagestr,
 182                                    const struct option *options);
 183
 184 extern int optbug(const struct option *opt, const char *reason);
 185 extern int opterror(const struct option *opt, const char *reason, int flags);
 186 #if defined(__GNUC__) && ! defined(clang)
 187 #define opterror(o,r,f) (opterror((o),(r),(f)), -1)
 188 #endif
 189
 190 /*----- incremental advanced APIs -----*/
 191
 192 enum {
 193         PARSE_OPT_HELP = -1,
 194         PARSE_OPT_DONE,
 195         PARSE_OPT_NON_OPTION,
 196         PARSE_OPT_UNKNOWN
 197 };
 198
 199 /*
 200  * It's okay for the caller to consume argv/argc in the usual way.
 201  * Other fields of that structure are private to parse-options and should not
 202  * be modified in any way.
 203  */
 204 struct parse_opt_ctx_t {
 205         const char **argv;
 206         const char **out;
 207         int argc, cpidx;
 208         const char *opt;
 209         int flags;
 210         const char *prefix;
 211 };
 212
 213 extern void parse_options_start(struct parse_opt_ctx_t *ctx,
 214                                 int argc, const char **argv, const char *prefix,
 215                                 const struct option *options, int flags);
 216
 217 extern int parse_options_step(struct parse_opt_ctx_t *ctx,
 218                               const struct option *options,
 219                               const char * const usagestr[]);
 220
 221 extern int parse_options_end(struct parse_opt_ctx_t *ctx);
 222
 223 extern int parse_options_concat(struct option *dst, size_t, struct option *src);
 224
 225 /*----- some often used options -----*/
 226 extern int parse_opt_abbrev_cb(const struct option *, const char *, int);
 227 extern int parse_opt_approxidate_cb(const struct option *, const char *, int);
 228 extern int parse_opt_expiry_date_cb(const struct option *, const char *, int);
 229 extern int parse_opt_color_flag_cb(const struct option *, const char *, int);
 230 extern int parse_opt_verbosity_cb(const struct option *, const char *, int);
 231 extern int parse_opt_with_commit(const struct option *, const char *, int);
 232 extern int parse_opt_tertiary(const struct option *, const char *, int);
 233 extern int parse_opt_string_list(const struct option *, const char *, int);
 234 extern int parse_opt_noop_cb(const struct option *, const char *, int);
 235
 236 #define OPT__VERBOSE(var, h)  OPT_BOOLEAN('v', "verbose", (var), (h))
 237 #define OPT__QUIET(var, h)    OPT_BOOLEAN('q', "quiet",   (var), (h))
 238 #define OPT__VERBOSITY(var) \
 239         { OPTION_CALLBACK, 'v', "verbose", (var), NULL, N_("be more verbose"), \
 240           PARSE_OPT_NOARG, &parse_opt_verbosity_cb, 0 }, \
 241         { OPTION_CALLBACK, 'q', "quiet", (var), NULL, N_("be more quiet"), \
 242           PARSE_OPT_NOARG, &parse_opt_verbosity_cb, 0 }
 243 #define OPT__DRY_RUN(var, h)  OPT_BOOLEAN('n', "dry-run", (var), (h))
 244 #define OPT__FORCE(var, h)    OPT_BOOLEAN('f', "force",   (var), (h))
 245 #define OPT__ABBREV(var)  \
 246         { OPTION_CALLBACK, 0, "abbrev", (var), N_("n"), \
 247           N_("use <n> digits to display SHA-1s"),       \
 248           PARSE_OPT_OPTARG, &parse_opt_abbrev_cb, 0 }
 249 #define OPT__COLOR(var, h) \
 250         OPT_COLOR_FLAG(0, "color", (var), (h))
 251 #define OPT_COLUMN(s, l, v, h) \
 252         { OPTION_CALLBACK, (s), (l), (v), N_("style"), (h), PARSE_OPT_OPTARG, parseopt_column_callback }
 253
 254 #endif