glib/goption.h

   1 /* goption.h - Option parser
   2  *
   3  *  Copyright (C) 2004  Anders Carlsson <andersca@gnome.org>
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Library General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Library General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Library General Public
  16  * License along with this library; if not, write to the
  17  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18  * Boston, MA 02111-1307, USA.
  19  */
  20
  21 #ifndef __G_OPTION_H__
  22 #define __G_OPTION_H__
  23
  24 #if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
  25 #error "Only <glib.h> can be included directly."
  26 #endif
  27
  28 #include <glib/gerror.h>
  29 #include <glib/gquark.h>
  30
  31 G_BEGIN_DECLS
  32
  33 /**
  34  * GOptionContext:
  35  *
  36  * A <structname>GOptionContext</structname> struct defines which options
  37  * are accepted by the commandline option parser. The struct has only private
  38  * fields and should not be directly accessed.
  39  */
  40 typedef struct _GOptionContext GOptionContext;
  41
  42 /**
  43  * GOptionGroup:
  44  *
  45  * A <structname>GOptionGroup</structname> struct defines the options in a single
  46  * group. The struct has only private fields and should not be directly accessed.
  47  *
  48  * All options in a group share the same translation function. Libraries which
  49  * need to parse commandline options are expected to provide a function for
  50  * getting a <structname>GOptionGroup</structname> holding their options, which
  51  * the application can then add to its #GOptionContext.
  52  */
  53 typedef struct _GOptionGroup   GOptionGroup;
  54 typedef struct _GOptionEntry   GOptionEntry;
  55
  56 /**
  57  * GOptionFlags:
  58  * @G_OPTION_FLAG_HIDDEN: The option doesn't appear in <option>--help</option>
  59  *  output.
  60  * @G_OPTION_FLAG_IN_MAIN: The option appears in the main section of the
  61  *  <option>--help</option> output, even if it is defined in a group.
  62  * @G_OPTION_FLAG_REVERSE: For options of the %G_OPTION_ARG_NONE kind, this flag
  63  *  indicates that the sense of the option is reversed.
  64  * @G_OPTION_FLAG_NO_ARG: For options of the %G_OPTION_ARG_CALLBACK kind,
  65  *  this flag indicates that the callback does not take any argument
  66  *  (like a %G_OPTION_ARG_NONE option). Since 2.8
  67  * @G_OPTION_FLAG_FILENAME: For options of the %G_OPTION_ARG_CALLBACK
  68  *  kind, this flag indicates that the argument should be passed to the
  69  *  callback in the GLib filename encoding rather than UTF-8. Since 2.8
  70  * @G_OPTION_FLAG_OPTIONAL_ARG: For options of the %G_OPTION_ARG_CALLBACK
  71  *  kind, this flag indicates that the argument supply is optional. If no argument
  72  *  is given then data of %GOptionParseFunc will be set to NULL. Since 2.8
  73  * @G_OPTION_FLAG_NOALIAS: This flag turns off the automatic conflict resolution
  74  *  which prefixes long option names with <literal>groupname-</literal> if
  75  *  there is a conflict. This option should only be used in situations where
  76  *  aliasing is necessary to model some legacy commandline interface. It is
  77  *  not safe to use this option, unless all option groups are under your
  78  *  direct control. Since 2.8.
  79  *
  80  * Flags which modify individual options.
  81  */
  82 typedef enum
  83 {
  84   G_OPTION_FLAG_HIDDEN          = 1 << 0,
  85   G_OPTION_FLAG_IN_MAIN         = 1 << 1,
  86   G_OPTION_FLAG_REVERSE         = 1 << 2,
  87   G_OPTION_FLAG_NO_ARG          = 1 << 3,
  88   G_OPTION_FLAG_FILENAME        = 1 << 4,
  89   G_OPTION_FLAG_OPTIONAL_ARG    = 1 << 5,
  90   G_OPTION_FLAG_NOALIAS         = 1 << 6
  91 } GOptionFlags;
  92
  93 /**
  94  * GOptionArg:
  95  * @G_OPTION_ARG_NONE: No extra argument. This is useful for simple flags.
  96  * @G_OPTION_ARG_STRING: The option takes a string argument.
  97  * @G_OPTION_ARG_INT: The option takes an integer argument.
  98  * @G_OPTION_ARG_CALLBACK: The option provides a callback to parse the
  99  *  extra argument.
 100  * @G_OPTION_ARG_FILENAME: The option takes a filename as argument.
 101  * @G_OPTION_ARG_STRING_ARRAY: The option takes a string argument, multiple
 102  *  uses of the option are collected into an array of strings.
 103  * @G_OPTION_ARG_FILENAME_ARRAY: The option takes a filename as argument,
 104  *  multiple uses of the option are collected into an array of strings.
 105  * @G_OPTION_ARG_DOUBLE: The option takes a double argument. The argument
 106  *  can be formatted either for the user's locale or for the "C" locale. Since 2.12
 107  * @G_OPTION_ARG_INT64: The option takes a 64-bit integer. Like %G_OPTION_ARG_INT
 108  *  but for larger numbers. The number can be in decimal base, or in hexadecimal
 109  *  (when prefixed with <literal>0x</literal>, for example, <literal>0xffffffff</literal>).
 110  *  Since 2.12
 111  *
 112  * The #GOptionArg enum values determine which type of extra argument the
 113  * options expect to find. If an option expects an extra argument, it
 114  * can be specified in several ways; with a short option:
 115  * <option>-x arg</option>, with a long option: <option>--name arg</option>
 116  * or combined in a single argument: <option>--name=arg</option>.
 117  */
 118 typedef enum
 119 {
 120   G_OPTION_ARG_NONE,
 121   G_OPTION_ARG_STRING,
 122   G_OPTION_ARG_INT,
 123   G_OPTION_ARG_CALLBACK,
 124   G_OPTION_ARG_FILENAME,
 125   G_OPTION_ARG_STRING_ARRAY,
 126   G_OPTION_ARG_FILENAME_ARRAY,
 127   G_OPTION_ARG_DOUBLE,
 128   G_OPTION_ARG_INT64
 129 } GOptionArg;
 130
 131 /**
 132  * GOptionArgFunc:
 133  * @option_name: The name of the option being parsed. This will be either a
 134  *  single dash followed by a single letter (for a short name) or two dashes
 135  *  followed by a long option name.
 136  * @value: The value to be parsed.
 137  * @data: User data added to the #GOptionGroup containing the option when it
 138  *  was created with g_option_group_new()
 139  * @error: A return location for errors. The error code %G_OPTION_ERROR_FAILED
 140  *  is intended to be used for errors in #GOptionArgFunc callbacks.
 141  *
 142  * The type of function to be passed as callback for %G_OPTION_ARG_CALLBACK
 143  * options.
 144  *
 145  * Returns: %TRUE if the option was successfully parsed, %FALSE if an error
 146  *  occurred, in which case @error should be set with g_set_error()
 147  */
 148 typedef gboolean (*GOptionArgFunc) (const gchar    *option_name,
 149                                     const gchar    *value,
 150                                     gpointer        data,
 151                                     GError        **error);
 152
 153 /**
 154  * GOptionParseFunc:
 155  * @context: The active #GOptionContext
 156  * @group: The group to which the function belongs
 157  * @data: User data added to the #GOptionGroup containing the option when it
 158  *  was created with g_option_group_new()
 159  * @error: A return location for error details
 160  *
 161  * The type of function that can be called before and after parsing.
 162  *
 163  * Returns: %TRUE if the function completed successfully, %FALSE if an error
 164  *  occurred, in which case @error should be set with g_set_error()
 165  */
 166 typedef gboolean (*GOptionParseFunc) (GOptionContext *context,
 167                                       GOptionGroup   *group,
 168                                       gpointer        data,
 169                                       GError        **error);
 170
 171 /**
 172  * GOptionErrorFunc:
 173  * @context: The active #GOptionContext
 174  * @group: The group to which the function belongs
 175  * @data: User data added to the #GOptionGroup containing the option when it
 176  *  was created with g_option_group_new()
 177  * @error: The #GError containing details about the parse error
 178  *
 179  * The type of function to be used as callback when a parse error occurs.
 180  */
 181 typedef void (*GOptionErrorFunc) (GOptionContext *context,
 182                                   GOptionGroup   *group,
 183                                   gpointer        data,
 184                                   GError        **error);
 185
 186 /**
 187  * G_OPTION_ERROR:
 188  *
 189  * Error domain for option parsing. Errors in this domain will
 190  * be from the #GOptionError enumeration. See #GError for information on
 191  * error domains.
 192  */
 193 #define G_OPTION_ERROR (g_option_error_quark ())
 194
 195 /**
 196  * GOptionError:
 197  * @G_OPTION_ERROR_UNKNOWN_OPTION: An option was not known to the parser.
 198  *  This error will only be reported, if the parser hasn't been instructed
 199  *  to ignore unknown options, see g_option_context_set_ignore_unknown_options().
 200  * @G_OPTION_ERROR_BAD_VALUE: A value couldn't be parsed.
 201  * @G_OPTION_ERROR_FAILED: A #GOptionArgFunc callback failed.
 202  *
 203  * Error codes returned by option parsing.
 204  */
 205 typedef enum
 206 {
 207   G_OPTION_ERROR_UNKNOWN_OPTION,
 208   G_OPTION_ERROR_BAD_VALUE,
 209   G_OPTION_ERROR_FAILED
 210 } GOptionError;
 211
 212 GLIB_AVAILABLE_IN_ALL
 213 GQuark g_option_error_quark (void);
 214
 215 /**
 216  * GOptionEntry:
 217  * @long_name: The long name of an option can be used to specify it
 218  *  in a commandline as --<replaceable>long_name</replaceable>. Every
 219  *  option must have a long name. To resolve conflicts if multiple
 220  *  option groups contain the same long name, it is also possible to
 221  *  specify the option as
 222  *  --<replaceable>groupname</replaceable>-<replaceable>long_name</replaceable>.
 223  * @short_name: If an option has a short name, it can be specified
 224  *  -<replaceable>short_name</replaceable> in a commandline. @short_name must be
 225  *  a printable ASCII character different from '-', or zero if the option has no
 226  *  short name.
 227  * @flags: Flags from #GOptionFlags.
 228  * @arg: The type of the option, as a #GOptionArg.
 229  * @arg_data: If the @arg type is %G_OPTION_ARG_CALLBACK, then @arg_data must
 230  *  point to a #GOptionArgFunc callback function, which will be called to handle
 231  *  the extra argument. Otherwise, @arg_data is a pointer to a location to store
 232  *  the value, the required type of the location depends on the @arg type:
 233  *  <variablelist>
 234  *  <varlistentry>
 235  *  <term>%G_OPTION_ARG_NONE</term>
 236  *  <listitem><para>%gboolean</para></listitem>
 237  *  </varlistentry>
 238  *  <varlistentry>
 239  *  <term>%G_OPTION_ARG_STRING</term>
 240  *  <listitem><para>%gchar*</para></listitem>
 241  *  </varlistentry>
 242  *  <varlistentry>
 243  *  <term>%G_OPTION_ARG_INT</term>
 244  *  <listitem><para>%gint</para></listitem>
 245  *  </varlistentry>
 246  *  <varlistentry>
 247  *  <term>%G_OPTION_ARG_FILENAME</term>
 248  *  <listitem><para>%gchar*</para></listitem>
 249  *  </varlistentry>
 250  *  <varlistentry>
 251  *  <term>%G_OPTION_ARG_STRING_ARRAY</term>
 252  *  <listitem><para>%gchar**</para></listitem>
 253  *  </varlistentry>
 254  *  <varlistentry>
 255  *  <term>%G_OPTION_ARG_FILENAME_ARRAY</term>
 256  *  <listitem><para>%gchar**</para></listitem>
 257  *  </varlistentry>
 258  *  <varlistentry>
 259  *  <term>%G_OPTION_ARG_DOUBLE</term>
 260  *  <listitem><para>%gdouble</para></listitem>
 261  *  </varlistentry>
 262  *  </variablelist>
 263  *  If @arg type is %G_OPTION_ARG_STRING or %G_OPTION_ARG_FILENAME the location
 264  *  will contain a newly allocated string if the option was given. That string
 265  *  needs to be freed by the callee using g_free(). Likewise if @arg type is
 266  *  %G_OPTION_ARG_STRING_ARRAY or %G_OPTION_ARG_FILENAME_ARRAY, the data should
 267  *  be freed using g_strfreev().
 268  * @description: the description for the option in <option>--help</option>
 269  *  output. The @description is translated using the @translate_func of the
 270  *  group, see g_option_group_set_translation_domain().
 271  * @arg_description: The placeholder to use for the extra argument parsed
 272  *  by the option in <option>--help</option>
 273  *  output. The @arg_description is translated using the @translate_func of the
 274  *  group, see g_option_group_set_translation_domain().
 275  *
 276  * A <structname>GOptionEntry</structname> defines a single option.
 277  * To have an effect, they must be added to a #GOptionGroup with
 278  * g_option_context_add_main_entries() or g_option_group_add_entries().
 279  */
 280 struct _GOptionEntry
 281 {
 282   const gchar *long_name;
 283   gchar        short_name;
 284   gint         flags;
 285
 286   GOptionArg   arg;
 287   gpointer     arg_data;
 288
 289   const gchar *description;
 290   const gchar *arg_description;
 291 };
 292
 293 /**
 294  * G_OPTION_REMAINING:
 295  *
 296  * If a long option in the main group has this name, it is not treated as a
 297  * regular option. Instead it collects all non-option arguments which would
 298  * otherwise be left in <literal>argv</literal>. The option must be of type
 299  * %G_OPTION_ARG_CALLBACK, %G_OPTION_ARG_STRING_ARRAY
 300  * or %G_OPTION_ARG_FILENAME_ARRAY.
 301  *
 302  *
 303  * Using #G_OPTION_REMAINING instead of simply scanning <literal>argv</literal>
 304  * for leftover arguments has the advantage that GOption takes care of
 305  * necessary encoding conversions for strings or filenames.
 306  *
 307  * Since: 2.6
 308  */
 309 #define G_OPTION_REMAINING ""
 310
 311 GLIB_AVAILABLE_IN_ALL
 312 GOptionContext *g_option_context_new              (const gchar         *parameter_string);
 313 GLIB_AVAILABLE_IN_ALL
 314 void            g_option_context_set_summary      (GOptionContext      *context,
 315                                                    const gchar         *summary);
 316 GLIB_AVAILABLE_IN_ALL
 317 const gchar *   g_option_context_get_summary      (GOptionContext     *context);
 318 GLIB_AVAILABLE_IN_ALL
 319 void            g_option_context_set_description  (GOptionContext      *context,
 320                                                    const gchar         *description);
 321 GLIB_AVAILABLE_IN_ALL
 322 const gchar *   g_option_context_get_description  (GOptionContext     *context);
 323 GLIB_AVAILABLE_IN_ALL
 324 void            g_option_context_free             (GOptionContext      *context);
 325 GLIB_AVAILABLE_IN_ALL
 326 void            g_option_context_set_help_enabled (GOptionContext      *context,
 327                                                    gboolean             help_enabled);
 328 GLIB_AVAILABLE_IN_ALL
 329 gboolean        g_option_context_get_help_enabled (GOptionContext      *context);
 330 GLIB_AVAILABLE_IN_ALL
 331 void            g_option_context_set_ignore_unknown_options (GOptionContext *context,
 332                                                              gboolean        ignore_unknown);
 333 GLIB_AVAILABLE_IN_ALL
 334 gboolean        g_option_context_get_ignore_unknown_options (GOptionContext *context);
 335
 336 GLIB_AVAILABLE_IN_ALL
 337 void            g_option_context_add_main_entries (GOptionContext      *context,
 338                                                    const GOptionEntry  *entries,
 339                                                    const gchar         *translation_domain);
 340 GLIB_AVAILABLE_IN_ALL
 341 gboolean        g_option_context_parse            (GOptionContext      *context,
 342                                                    gint                *argc,
 343                                                    gchar             ***argv,
 344                                                    GError             **error);
 345 GLIB_AVAILABLE_IN_ALL
 346 void            g_option_context_set_translate_func (GOptionContext     *context,
 347                                                      GTranslateFunc      func,
 348                                                      gpointer            data,
 349                                                      GDestroyNotify      destroy_notify);
 350 GLIB_AVAILABLE_IN_ALL
 351 void            g_option_context_set_translation_domain (GOptionContext  *context,
 352                                                          const gchar     *domain);
 353
 354 GLIB_AVAILABLE_IN_ALL
 355 void            g_option_context_add_group      (GOptionContext *context,
 356                                                  GOptionGroup   *group);
 357 GLIB_AVAILABLE_IN_ALL
 358 void          g_option_context_set_main_group (GOptionContext *context,
 359                                                GOptionGroup   *group);
 360 GLIB_AVAILABLE_IN_ALL
 361 GOptionGroup *g_option_context_get_main_group (GOptionContext *context);
 362 GLIB_AVAILABLE_IN_ALL
 363 gchar        *g_option_context_get_help       (GOptionContext *context,
 364                                                gboolean        main_help,
 365                                                GOptionGroup   *group);
 366
 367 GLIB_AVAILABLE_IN_ALL
 368 GOptionGroup *g_option_group_new                    (const gchar        *name,
 369                                                      const gchar        *description,
 370                                                      const gchar        *help_description,
 371                                                      gpointer            user_data,
 372                                                      GDestroyNotify      destroy);
 373 GLIB_AVAILABLE_IN_ALL
 374 void          g_option_group_set_parse_hooks        (GOptionGroup       *group,
 375                                                      GOptionParseFunc    pre_parse_func,
 376                                                      GOptionParseFunc    post_parse_func);
 377 GLIB_AVAILABLE_IN_ALL
 378 void          g_option_group_set_error_hook         (GOptionGroup       *group,
 379                                                      GOptionErrorFunc    error_func);
 380 GLIB_AVAILABLE_IN_ALL
 381 void          g_option_group_free                   (GOptionGroup       *group);
 382 GLIB_AVAILABLE_IN_ALL
 383 void          g_option_group_add_entries            (GOptionGroup       *group,
 384                                                      const GOptionEntry *entries);
 385 GLIB_AVAILABLE_IN_ALL
 386 void          g_option_group_set_translate_func     (GOptionGroup       *group,
 387                                                      GTranslateFunc      func,
 388                                                      gpointer            data,
 389                                                      GDestroyNotify      destroy_notify);
 390 GLIB_AVAILABLE_IN_ALL
 391 void          g_option_group_set_translation_domain (GOptionGroup       *group,
 392                                                      const gchar        *domain);
 393
 394 G_END_DECLS
 395
 396 #endif /* __G_OPTION_H__ */