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, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #ifndef __G_OPTION_H__
  20 #define __G_OPTION_H__
  21
  22 #if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
  23 #error "Only <glib.h> can be included directly."
  24 #endif
  25
  26 #include <glib/gerror.h>
  27 #include <glib/gquark.h>
  28
  29 G_BEGIN_DECLS
  30
  31 /**
  32  * GOptionContext:
  33  *
  34  * A <structname>GOptionContext</structname> struct defines which options
  35  * are accepted by the commandline option parser. The struct has only private
  36  * fields and should not be directly accessed.
  37  */
  38 typedef struct _GOptionContext GOptionContext;
  39
  40 /**
  41  * GOptionGroup:
  42  *
  43  * A <structname>GOptionGroup</structname> struct defines the options in a single
  44  * group. The struct has only private fields and should not be directly accessed.
  45  *
  46  * All options in a group share the same translation function. Libraries which
  47  * need to parse commandline options are expected to provide a function for
  48  * getting a <structname>GOptionGroup</structname> holding their options, which
  49  * the application can then add to its #GOptionContext.
  50  */
  51 typedef struct _GOptionGroup   GOptionGroup;
  52 typedef struct _GOptionEntry   GOptionEntry;
  53
  54 /**
  55  * GOptionFlags:
  56  * @G_OPTION_FLAG_HIDDEN: The option doesn't appear in <option>--help</option>
  57  *  output.
  58  * @G_OPTION_FLAG_IN_MAIN: The option appears in the main section of the
  59  *  <option>--help</option> output, even if it is defined in a group.
  60  * @G_OPTION_FLAG_REVERSE: For options of the %G_OPTION_ARG_NONE kind, this flag
  61  *  indicates that the sense of the option is reversed.
  62  * @G_OPTION_FLAG_NO_ARG: For options of the %G_OPTION_ARG_CALLBACK kind,
  63  *  this flag indicates that the callback does not take any argument
  64  *  (like a %G_OPTION_ARG_NONE option). Since 2.8
  65  * @G_OPTION_FLAG_FILENAME: For options of the %G_OPTION_ARG_CALLBACK
  66  *  kind, this flag indicates that the argument should be passed to the
  67  *  callback in the GLib filename encoding rather than UTF-8. Since 2.8
  68  * @G_OPTION_FLAG_OPTIONAL_ARG: For options of the %G_OPTION_ARG_CALLBACK
  69  *  kind, this flag indicates that the argument supply is optional. If no argument
  70  *  is given then data of %GOptionParseFunc will be set to NULL. Since 2.8
  71  * @G_OPTION_FLAG_NOALIAS: This flag turns off the automatic conflict resolution
  72  *  which prefixes long option names with <literal>groupname-</literal> if
  73  *  there is a conflict. This option should only be used in situations where
  74  *  aliasing is necessary to model some legacy commandline interface. It is
  75  *  not safe to use this option, unless all option groups are under your
  76  *  direct control. Since 2.8.
  77  *
  78  * Flags which modify individual options.
  79  */
  80 typedef enum
  81 {
  82   G_OPTION_FLAG_HIDDEN          = 1 << 0,
  83   G_OPTION_FLAG_IN_MAIN         = 1 << 1,
  84   G_OPTION_FLAG_REVERSE         = 1 << 2,
  85   G_OPTION_FLAG_NO_ARG          = 1 << 3,
  86   G_OPTION_FLAG_FILENAME        = 1 << 4,
  87   G_OPTION_FLAG_OPTIONAL_ARG    = 1 << 5,
  88   G_OPTION_FLAG_NOALIAS         = 1 << 6
  89 } GOptionFlags;
  90
  91 /**
  92  * GOptionArg:
  93  * @G_OPTION_ARG_NONE: No extra argument. This is useful for simple flags.
  94  * @G_OPTION_ARG_STRING: The option takes a string argument.
  95  * @G_OPTION_ARG_INT: The option takes an integer argument.
  96  * @G_OPTION_ARG_CALLBACK: The option provides a callback to parse the
  97  *  extra argument.
  98  * @G_OPTION_ARG_FILENAME: The option takes a filename as argument.
  99  * @G_OPTION_ARG_STRING_ARRAY: The option takes a string argument, multiple
 100  *  uses of the option are collected into an array of strings.
 101  * @G_OPTION_ARG_FILENAME_ARRAY: The option takes a filename as argument,
 102  *  multiple uses of the option are collected into an array of strings.
 103  * @G_OPTION_ARG_DOUBLE: The option takes a double argument. The argument
 104  *  can be formatted either for the user's locale or for the "C" locale. Since 2.12
 105  * @G_OPTION_ARG_INT64: The option takes a 64-bit integer. Like %G_OPTION_ARG_INT
 106  *  but for larger numbers. The number can be in decimal base, or in hexadecimal
 107  *  (when prefixed with <literal>0x</literal>, for example, <literal>0xffffffff</literal>).
 108  *  Since 2.12
 109  *
 110  * The #GOptionArg enum values determine which type of extra argument the
 111  * options expect to find. If an option expects an extra argument, it
 112  * can be specified in several ways; with a short option:
 113  * <option>-x arg</option>, with a long option: <option>--name arg</option>
 114  * or combined in a single argument: <option>--name=arg</option>.
 115  */
 116 typedef enum
 117 {
 118   G_OPTION_ARG_NONE,
 119   G_OPTION_ARG_STRING,
 120   G_OPTION_ARG_INT,
 121   G_OPTION_ARG_CALLBACK,
 122   G_OPTION_ARG_FILENAME,
 123   G_OPTION_ARG_STRING_ARRAY,
 124   G_OPTION_ARG_FILENAME_ARRAY,
 125   G_OPTION_ARG_DOUBLE,
 126   G_OPTION_ARG_INT64
 127 } GOptionArg;
 128
 129 /**
 130  * GOptionArgFunc:
 131  * @option_name: The name of the option being parsed. This will be either a
 132  *  single dash followed by a single letter (for a short name) or two dashes
 133  *  followed by a long option name.
 134  * @value: The value to be parsed.
 135  * @data: User data added to the #GOptionGroup containing the option when it
 136  *  was created with g_option_group_new()
 137  * @error: A return location for errors. The error code %G_OPTION_ERROR_FAILED
 138  *  is intended to be used for errors in #GOptionArgFunc callbacks.
 139  *
 140  * The type of function to be passed as callback for %G_OPTION_ARG_CALLBACK
 141  * options.
 142  *
 143  * Returns: %TRUE if the option was successfully parsed, %FALSE if an error
 144  *  occurred, in which case @error should be set with g_set_error()
 145  */
 146 typedef gboolean (*GOptionArgFunc) (const gchar    *option_name,
 147                                     const gchar    *value,
 148                                     gpointer        data,
 149                                     GError        **error);
 150
 151 /**
 152  * GOptionParseFunc:
 153  * @context: The active #GOptionContext
 154  * @group: The group to which the function belongs
 155  * @data: User data added to the #GOptionGroup containing the option when it
 156  *  was created with g_option_group_new()
 157  * @error: A return location for error details
 158  *
 159  * The type of function that can be called before and after parsing.
 160  *
 161  * Returns: %TRUE if the function completed successfully, %FALSE if an error
 162  *  occurred, in which case @error should be set with g_set_error()
 163  */
 164 typedef gboolean (*GOptionParseFunc) (GOptionContext *context,
 165                                       GOptionGroup   *group,
 166                                       gpointer        data,
 167                                       GError        **error);
 168
 169 /**
 170  * GOptionErrorFunc:
 171  * @context: The active #GOptionContext
 172  * @group: The group to which the function belongs
 173  * @data: User data added to the #GOptionGroup containing the option when it
 174  *  was created with g_option_group_new()
 175  * @error: The #GError containing details about the parse error
 176  *
 177  * The type of function to be used as callback when a parse error occurs.
 178  */
 179 typedef void (*GOptionErrorFunc) (GOptionContext *context,
 180                                   GOptionGroup   *group,
 181                                   gpointer        data,
 182                                   GError        **error);
 183
 184 /**
 185  * G_OPTION_ERROR:
 186  *
 187  * Error domain for option parsing. Errors in this domain will
 188  * be from the #GOptionError enumeration. See #GError for information on
 189  * error domains.
 190  */
 191 #define G_OPTION_ERROR (g_option_error_quark ())
 192
 193 /**
 194  * GOptionError:
 195  * @G_OPTION_ERROR_UNKNOWN_OPTION: An option was not known to the parser.
 196  *  This error will only be reported, if the parser hasn't been instructed
 197  *  to ignore unknown options, see g_option_context_set_ignore_unknown_options().
 198  * @G_OPTION_ERROR_BAD_VALUE: A value couldn't be parsed.
 199  * @G_OPTION_ERROR_FAILED: A #GOptionArgFunc callback failed.
 200  *
 201  * Error codes returned by option parsing.
 202  */
 203 typedef enum
 204 {
 205   G_OPTION_ERROR_UNKNOWN_OPTION,
 206   G_OPTION_ERROR_BAD_VALUE,
 207   G_OPTION_ERROR_FAILED
 208 } GOptionError;
 209
 210 GLIB_AVAILABLE_IN_ALL
 211 GQuark g_option_error_quark (void);
 212
 213 /**
 214  * GOptionEntry:
 215  * @long_name: The long name of an option can be used to specify it
 216  *  in a commandline as --<replaceable>long_name</replaceable>. Every
 217  *  option must have a long name. To resolve conflicts if multiple
 218  *  option groups contain the same long name, it is also possible to
 219  *  specify the option as
 220  *  --<replaceable>groupname</replaceable>-<replaceable>long_name</replaceable>.
 221  * @short_name: If an option has a short name, it can be specified
 222  *  -<replaceable>short_name</replaceable> in a commandline. @short_name must be
 223  *  a printable ASCII character different from '-', or zero if the option has no
 224  *  short name.
 225  * @flags: Flags from #GOptionFlags.
 226  * @arg: The type of the option, as a #GOptionArg.
 227  * @arg_data: If the @arg type is %G_OPTION_ARG_CALLBACK, then @arg_data must
 228  *  point to a #GOptionArgFunc callback function, which will be called to handle
 229  *  the extra argument. Otherwise, @arg_data is a pointer to a location to store
 230  *  the value, the required type of the location depends on the @arg type:
 231  *  <variablelist>
 232  *  <varlistentry>
 233  *  <term>%G_OPTION_ARG_NONE</term>
 234  *  <listitem><para>%gboolean</para></listitem>
 235  *  </varlistentry>
 236  *  <varlistentry>
 237  *  <term>%G_OPTION_ARG_STRING</term>
 238  *  <listitem><para>%gchar*</para></listitem>
 239  *  </varlistentry>
 240  *  <varlistentry>
 241  *  <term>%G_OPTION_ARG_INT</term>
 242  *  <listitem><para>%gint</para></listitem>
 243  *  </varlistentry>
 244  *  <varlistentry>
 245  *  <term>%G_OPTION_ARG_FILENAME</term>
 246  *  <listitem><para>%gchar*</para></listitem>
 247  *  </varlistentry>
 248  *  <varlistentry>
 249  *  <term>%G_OPTION_ARG_STRING_ARRAY</term>
 250  *  <listitem><para>%gchar**</para></listitem>
 251  *  </varlistentry>
 252  *  <varlistentry>
 253  *  <term>%G_OPTION_ARG_FILENAME_ARRAY</term>
 254  *  <listitem><para>%gchar**</para></listitem>
 255  *  </varlistentry>
 256  *  <varlistentry>
 257  *  <term>%G_OPTION_ARG_DOUBLE</term>
 258  *  <listitem><para>%gdouble</para></listitem>
 259  *  </varlistentry>
 260  *  </variablelist>
 261  *  If @arg type is %G_OPTION_ARG_STRING or %G_OPTION_ARG_FILENAME the location
 262  *  will contain a newly allocated string if the option was given. That string
 263  *  needs to be freed by the callee using g_free(). Likewise if @arg type is
 264  *  %G_OPTION_ARG_STRING_ARRAY or %G_OPTION_ARG_FILENAME_ARRAY, the data should
 265  *  be freed using g_strfreev().
 266  * @description: the description for the option in <option>--help</option>
 267  *  output. The @description is translated using the @translate_func of the
 268  *  group, see g_option_group_set_translation_domain().
 269  * @arg_description: The placeholder to use for the extra argument parsed
 270  *  by the option in <option>--help</option>
 271  *  output. The @arg_description is translated using the @translate_func of the
 272  *  group, see g_option_group_set_translation_domain().
 273  *
 274  * A <structname>GOptionEntry</structname> defines a single option.
 275  * To have an effect, they must be added to a #GOptionGroup with
 276  * g_option_context_add_main_entries() or g_option_group_add_entries().
 277  */
 278 struct _GOptionEntry
 279 {
 280   const gchar *long_name;
 281   gchar        short_name;
 282   gint         flags;
 283
 284   GOptionArg   arg;
 285   gpointer     arg_data;
 286
 287   const gchar *description;
 288   const gchar *arg_description;
 289 };
 290
 291 /**
 292  * G_OPTION_REMAINING:
 293  *
 294  * If a long option in the main group has this name, it is not treated as a
 295  * regular option. Instead it collects all non-option arguments which would
 296  * otherwise be left in <literal>argv</literal>. The option must be of type
 297  * %G_OPTION_ARG_CALLBACK, %G_OPTION_ARG_STRING_ARRAY
 298  * or %G_OPTION_ARG_FILENAME_ARRAY.
 299  *
 300  *
 301  * Using #G_OPTION_REMAINING instead of simply scanning <literal>argv</literal>
 302  * for leftover arguments has the advantage that GOption takes care of
 303  * necessary encoding conversions for strings or filenames.
 304  *
 305  * Since: 2.6
 306  */
 307 #define G_OPTION_REMAINING ""
 308
 309 GLIB_AVAILABLE_IN_ALL
 310 GOptionContext *g_option_context_new              (const gchar         *parameter_string);
 311 GLIB_AVAILABLE_IN_ALL
 312 void            g_option_context_set_summary      (GOptionContext      *context,
 313                                                    const gchar         *summary);
 314 GLIB_AVAILABLE_IN_ALL
 315 const gchar *   g_option_context_get_summary      (GOptionContext     *context);
 316 GLIB_AVAILABLE_IN_ALL
 317 void            g_option_context_set_description  (GOptionContext      *context,
 318                                                    const gchar         *description);
 319 GLIB_AVAILABLE_IN_ALL
 320 const gchar *   g_option_context_get_description  (GOptionContext     *context);
 321 GLIB_AVAILABLE_IN_ALL
 322 void            g_option_context_free             (GOptionContext      *context);
 323 GLIB_AVAILABLE_IN_ALL
 324 void            g_option_context_set_help_enabled (GOptionContext      *context,
 325                                                    gboolean             help_enabled);
 326 GLIB_AVAILABLE_IN_ALL
 327 gboolean        g_option_context_get_help_enabled (GOptionContext      *context);
 328 GLIB_AVAILABLE_IN_ALL
 329 void            g_option_context_set_ignore_unknown_options (GOptionContext *context,
 330                                                              gboolean        ignore_unknown);
 331 GLIB_AVAILABLE_IN_ALL
 332 gboolean        g_option_context_get_ignore_unknown_options (GOptionContext *context);
 333
 334 GLIB_AVAILABLE_IN_ALL
 335 void            g_option_context_add_main_entries (GOptionContext      *context,
 336                                                    const GOptionEntry  *entries,
 337                                                    const gchar         *translation_domain);
 338 GLIB_AVAILABLE_IN_ALL
 339 gboolean        g_option_context_parse            (GOptionContext      *context,
 340                                                    gint                *argc,
 341                                                    gchar             ***argv,
 342                                                    GError             **error);
 343 GLIB_AVAILABLE_IN_2_40
 344 gboolean        g_option_context_parse_strv       (GOptionContext      *context,
 345                                                    gchar             ***arguments,
 346                                                    GError             **error);
 347 GLIB_AVAILABLE_IN_ALL
 348 void            g_option_context_set_translate_func (GOptionContext     *context,
 349                                                      GTranslateFunc      func,
 350                                                      gpointer            data,
 351                                                      GDestroyNotify      destroy_notify);
 352 GLIB_AVAILABLE_IN_ALL
 353 void            g_option_context_set_translation_domain (GOptionContext  *context,
 354                                                          const gchar     *domain);
 355
 356 GLIB_AVAILABLE_IN_ALL
 357 void            g_option_context_add_group      (GOptionContext *context,
 358                                                  GOptionGroup   *group);
 359 GLIB_AVAILABLE_IN_ALL
 360 void          g_option_context_set_main_group (GOptionContext *context,
 361                                                GOptionGroup   *group);
 362 GLIB_AVAILABLE_IN_ALL
 363 GOptionGroup *g_option_context_get_main_group (GOptionContext *context);
 364 GLIB_AVAILABLE_IN_ALL
 365 gchar        *g_option_context_get_help       (GOptionContext *context,
 366                                                gboolean        main_help,
 367                                                GOptionGroup   *group);
 368
 369 GLIB_AVAILABLE_IN_ALL
 370 GOptionGroup *g_option_group_new                    (const gchar        *name,
 371                                                      const gchar        *description,
 372                                                      const gchar        *help_description,
 373                                                      gpointer            user_data,
 374                                                      GDestroyNotify      destroy);
 375 GLIB_AVAILABLE_IN_ALL
 376 void          g_option_group_set_parse_hooks        (GOptionGroup       *group,
 377                                                      GOptionParseFunc    pre_parse_func,
 378                                                      GOptionParseFunc    post_parse_func);
 379 GLIB_AVAILABLE_IN_ALL
 380 void          g_option_group_set_error_hook         (GOptionGroup       *group,
 381                                                      GOptionErrorFunc    error_func);
 382 GLIB_AVAILABLE_IN_ALL
 383 void          g_option_group_free                   (GOptionGroup       *group);
 384 GLIB_AVAILABLE_IN_ALL
 385 void          g_option_group_add_entries            (GOptionGroup       *group,
 386                                                      const GOptionEntry *entries);
 387 GLIB_AVAILABLE_IN_ALL
 388 void          g_option_group_set_translate_func     (GOptionGroup       *group,
 389                                                      GTranslateFunc      func,
 390                                                      gpointer            data,
 391                                                      GDestroyNotify      destroy_notify);
 392 GLIB_AVAILABLE_IN_ALL
 393 void          g_option_group_set_translation_domain (GOptionGroup       *group,
 394                                                      const gchar        *domain);
 395
 396 G_END_DECLS
 397
 398 #endif /* __G_OPTION_H__ */