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goption.c

/* goption.c - Option parser
 *
 *  Copyright (C) 1999, 2003 Red Hat Software
 *  Copyright (C) 2004       Anders Carlsson <andersca@gnome.org>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.      See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#include <glib.h>
#if (GLIB_MAJOR_VERSION == 2) && ((GLIB_MINOR_VERSION < 5) || \
            ((GLIB_MINOR_VERSION >= 5) && (GLIB_MICRO_VERSION < 4)))
#include "goption.h"

#include <glib/gi18n.h>

#include <string.h>
#include <stdlib.h>
#include <errno.h>

#define TRANSLATE(group, str) (((group)->translate_func ? (* (group)->translate_func) ((str), (group)->translate_data) : (str)))

typedef struct {
  GOptionArg arg_type;
  gpointer arg_data;  
  union {
    gboolean bool;
    gint integer;
    gchar *str;
    gchar **array;
  } prev;
  union {
    gchar *str;
    struct {
      gint len;
      gchar **data;
    } array;
  } allocated;
} Change;

typedef struct
{
  gchar **ptr;
  gchar *value;
} PendingNull;

struct _GOptionContext
{
  GList *groups;

  gchar *parameter_string;

  gboolean help_enabled;
  gboolean ignore_unknown;
  
  GOptionGroup *main_group;

  /* We keep a list of change so we can revert them */
  GList *changes;
  
  /* We also keep track of all argv elements that should be NULLed or
   * modified.
   */
  GList *pending_nulls;
};

struct _GOptionGroup
{
  gchar *name;
  gchar *description;
  gchar *help_description;

  GDestroyNotify  destroy_notify;
  gpointer        user_data;

  GTranslateFunc  translate_func;
  GDestroyNotify  translate_notify;
  gpointer    translate_data;

  GOptionEntry *entries;
  gint         n_entries;

  GOptionParseFunc pre_parse_func;
  GOptionParseFunc post_parse_func;
  GOptionErrorFunc error_func;
};

static void free_changes_list (GOptionContext *context,
                         gboolean        revert);
static void free_pending_nulls (GOptionContext *context,
                        gboolean        perform_nulls);

GQuark
g_option_error_quark (void)
{
  static GQuark q = 0;
  
  if (q == 0)
    q = g_quark_from_static_string ("g-option-context-error-quark");

  return q;
}

GOptionContext *
g_option_context_new (const gchar *parameter_string)

{
  GOptionContext *context;

  context = g_new0 (GOptionContext, 1);

  context->parameter_string = g_strdup (parameter_string);
  context->help_enabled = TRUE;

  return context;
}

void
g_option_context_free (GOptionContext *context)
{
  g_return_if_fail (context != NULL);

  g_list_foreach (context->groups, (GFunc)g_option_group_free, NULL);
  g_list_free (context->groups);

  if (context->main_group) 
    g_option_group_free (context->main_group);

  free_changes_list (context, FALSE);
  free_pending_nulls (context, FALSE);
  
  g_free (context->parameter_string);
  
  g_free (context);
}

void
g_option_context_set_help_enabled (GOptionContext *context,
                           gboolean        help_enabled)

{
  g_return_if_fail (context != NULL);

  context->help_enabled = help_enabled;
}

gboolean
g_option_context_get_help_enabled (GOptionContext *context)
{
  g_return_val_if_fail (context != NULL, FALSE);

  return context->help_enabled;
}

void
g_option_context_set_ignore_unknown_options (GOptionContext *context,
                                   gboolean          ignore_unknown)
{
  g_return_if_fail (context != NULL);

  context->ignore_unknown = ignore_unknown;
}

gboolean
g_option_context_get_ignore_unknown_options (GOptionContext *context)
{
  g_return_val_if_fail (context != NULL, FALSE);

  return context->ignore_unknown;
}

void
g_option_context_add_group (GOptionContext *context,
                      GOptionGroup   *group)
{
  g_return_if_fail (context != NULL);
  g_return_if_fail (group != NULL);
  g_return_if_fail (group->name != NULL);
  g_return_if_fail (group->description != NULL);
  g_return_if_fail (group->help_description != NULL);

  context->groups = g_list_prepend (context->groups, group);
}

void
g_option_context_set_main_group (GOptionContext *context,
                         GOptionGroup   *group)
{
  g_return_if_fail (context != NULL);
  g_return_if_fail (group != NULL);

  context->main_group = group;
}

GOptionGroup *
g_option_context_get_main_group (GOptionContext *context)
{
  g_return_val_if_fail (context != NULL, NULL);

  return context->main_group;
}

void
g_option_context_add_main_entries (GOptionContext      *context,
                           const GOptionEntry  *entries,
                           const gchar         *translation_domain)
{
  g_return_if_fail (entries != NULL);

  if (!context->main_group)
    context->main_group = g_option_group_new (NULL, NULL, NULL, NULL, NULL);
  
  g_option_group_add_entries (context->main_group, entries);
  g_option_group_set_translation_domain (context->main_group, translation_domain);
}

static void
print_entry (GOptionGroup       *group,
           gint                max_length,
           const GOptionEntry *entry)
{
  GString *str;

  if (entry->flags & G_OPTION_FLAG_HIDDEN)
    return;
        
  str = g_string_new (NULL);
  
  if (entry->short_name)
    g_string_append_printf (str, "  -%c, --%s", entry->short_name, entry->long_name);
  else
    g_string_append_printf (str, "  --%s", entry->long_name);
  
  if (entry->arg_description)
    g_string_append_printf (str, "=%s", TRANSLATE (group, entry->arg_description));
  
  g_print ("%-*s %s\n", max_length + 4, str->str,
         entry->description ? TRANSLATE (group, entry->description) : "");
  g_string_free (str, TRUE);  
}

static void
print_help (GOptionContext *context,
          gboolean        main_help,
          GOptionGroup   *group)
{
  GList *list;
  gint max_length, len;
  gint i;
  
  g_print ("%s\n  %s %s %s\n\n", 
         _("Usage:"), g_get_prgname(), _("[OPTION...]"),
         context->parameter_string ? context->parameter_string : "");

  list = context->groups;

  max_length = g_utf8_strlen ("--help, -?", -1);

  if (list)
    {
      len = g_utf8_strlen ("--help-all", -1);
      max_length = MAX (max_length, len);
    }

  while (list != NULL)
    {
      GOptionGroup *group = list->data;
      
      /* First, we check the --help-<groupname> options */
      len = g_utf8_strlen ("--help-", -1) + g_utf8_strlen (group->name, -1);
      max_length = MAX (max_length, len);

      /* Then we go through the entries */
      for (i = 0; i < group->n_entries; i++)
      {
        len = g_utf8_strlen (group->entries[i].long_name, -1);

        if (group->entries[i].short_name)
          len += 4;

        if (group->entries[i].arg != G_OPTION_ARG_NONE &&
            group->entries[i].arg_description)
          len += 1 + g_utf8_strlen (TRANSLATE (group, group->entries[i].arg_description), -1);

        max_length = MAX (max_length, len);
      }
      
      list = list->next;
    }

  /* Add a bit of padding */
  max_length += 4;
  
  list = context->groups;

  g_print ("%s\n  --%-*s %s\n", 
         _("Help Options:"), max_length, "help", _("Show help options"));

  /* We only want --help-all when there are groups */
  if (list)
    g_print ("  --%-*s %s\n", max_length, "help-all", _("Show all help options"));

  while (list)
    {
      GOptionGroup *group = list->data;

      g_print ("  --help-%-*s %s\n", max_length - 5, group->name, TRANSLATE (group, group->help_description));
      
      list = list->next;
    }

  g_print ("\n");

  if (group)
    {
      /* Print a certain group */
      
      g_print ("%s\n", TRANSLATE (group, group->description));
      for (i = 0; i < group->n_entries; i++)
      print_entry (group, max_length, &group->entries[i]);
      g_print ("\n");
    }
  else if (!main_help)
    {
      /* Print all groups */

      list = context->groups;

      while (list)
      {
        GOptionGroup *group = list->data;

        g_print ("%s\n", group->description);

        for (i = 0; i < group->n_entries; i++)
          if (!(group->entries[i].flags & G_OPTION_FLAG_IN_MAIN))
            print_entry (group, max_length, &group->entries[i]);
        
        g_print ("\n");
        list = list->next;
      }
    }
  
  /* Print application options if --help or --help-all has been specified */
  if (main_help || !group)
    {
      list = context->groups;

      g_print ("%s\n", _("Application Options:"));

      if (context->main_group)
      for (i = 0; i < context->main_group->n_entries; i++) 
        print_entry (context->main_group, max_length, &context->main_group->entries[i]);

      while (list != NULL)
      {
        GOptionGroup *group = list->data;

        /* Print main entries from other groups */
        for (i = 0; i < group->n_entries; i++)
          if (group->entries[i].flags & G_OPTION_FLAG_IN_MAIN)
            print_entry (group, max_length, &group->entries[i]);
        
        list = list->next;
      }

      g_print ("\n");
    }

  
  exit (0);
}

static gboolean
parse_int (const gchar *arg_name,
         const gchar *arg,
         gint        *result,
         GError     **error)
{
  gchar *end;
  glong tmp = strtol (arg, &end, 0);

  errno = 0;
  
  if (*arg == '\0' || *end != '\0')
    {
      g_set_error (error,
               G_OPTION_ERROR, G_OPTION_ERROR_BAD_VALUE,
               _("Cannot parse integer value '%s' for --%s"),
               arg, arg_name);
      return FALSE;
    }

  *result = tmp;
  if (*result != tmp || errno == ERANGE)
    {
      g_set_error (error,
               G_OPTION_ERROR, G_OPTION_ERROR_BAD_VALUE,
               _("Integer value '%s' for %s out of range"),
               arg, arg_name);
      return FALSE;
    }

  return TRUE;
}

static Change *
get_change (GOptionContext *context,
          GOptionArg      arg_type,
          gpointer        arg_data)
{
  GList *list;
  Change *change = NULL;
  
  for (list = context->changes; list != NULL; list = list->next)
    {
      change = list->data;

      if (change->arg_data == arg_data)
      goto found;
    }

  change = g_new0 (Change, 1);
  change->arg_type = arg_type;
  change->arg_data = arg_data;
  
  context->changes = g_list_prepend (context->changes, change);
  
 found:

  return change;
}

static void
add_pending_null (GOptionContext *context,
              gchar         **ptr,
              gchar          *value)
{
  PendingNull *n;

  n = g_new0 (PendingNull, 1);
  n->ptr = ptr;
  n->value = value;

  context->pending_nulls = g_list_prepend (context->pending_nulls, n);
}
              
static gboolean
parse_arg (GOptionContext *context,
         GOptionGroup   *group,
         GOptionEntry   *entry,
         const gchar    *value,
         const gchar    *option_name,
         GError        **error)
     
{
  Change *change;
  
  switch (entry->arg)
    {
    case G_OPTION_ARG_NONE:
      {
      change = get_change (context, G_OPTION_ARG_NONE,
                       entry->arg_data);

      *(gboolean *)entry->arg_data = TRUE;
      break;
      }          
    case G_OPTION_ARG_STRING:
      {
      gchar *data;

      data = g_locale_to_utf8 (value, -1, NULL, NULL, error);

      if (!data)
        return FALSE;

      change = get_change (context, G_OPTION_ARG_STRING,
                       entry->arg_data);
      g_free (change->allocated.str);
      
      change->prev.str = *(gchar **)entry->arg_data;
      change->allocated.str = data;
      
      *(gchar **)entry->arg_data = data;
      break;
      }
    case G_OPTION_ARG_STRING_ARRAY:
      {
      gchar *data;
      
      data = g_locale_to_utf8 (value, -1, NULL, NULL, error);

      if (!data)
        return FALSE;

      change = get_change (context, G_OPTION_ARG_STRING_ARRAY,
                       entry->arg_data);

      if (change->allocated.array.len == 0)
        {
          change->prev.array = entry->arg_data;
          change->allocated.array.data = g_new (gchar *, 2);
        }
      else
        change->allocated.array.data =
          g_renew (gchar *, change->allocated.array.data,
                 change->allocated.array.len + 2);

      change->allocated.array.data[change->allocated.array.len] = data;
      change->allocated.array.data[change->allocated.array.len + 1] = NULL;

      change->allocated.array.len ++;

      *(gchar ***)entry->arg_data = change->allocated.array.data;

      break;
      }
      
    case G_OPTION_ARG_FILENAME:
      {
      gchar *data;

      data = g_strdup (value);

      change = get_change (context, G_OPTION_ARG_FILENAME,
                       entry->arg_data);
      g_free (change->allocated.str);
      
      change->prev.str = *(gchar **)entry->arg_data;
      change->allocated.str = data;

      *(gchar **)entry->arg_data = data;
      break;
      }

    case G_OPTION_ARG_FILENAME_ARRAY:
      {
      gchar *data;
      
      data = g_strdup (value);

      change = get_change (context, G_OPTION_ARG_STRING_ARRAY,
                       entry->arg_data);

      if (change->allocated.array.len == 0)
        {
          change->prev.array = entry->arg_data;
          change->allocated.array.data = g_new (gchar *, 2);
        }
      else
        change->allocated.array.data =
          g_renew (gchar *, change->allocated.array.data,
                 change->allocated.array.len + 2);

      change->allocated.array.data[change->allocated.array.len] = data;
      change->allocated.array.data[change->allocated.array.len + 1] = NULL;

      change->allocated.array.len ++;

      *(gchar ***)entry->arg_data = change->allocated.array.data;

      break;
      }
      
    case G_OPTION_ARG_INT:
      {
      gint data;

      if (!parse_int (option_name, value,
                  &data,
                  error))
        return FALSE;

      change = get_change (context, G_OPTION_ARG_INT,
                       entry->arg_data);
      change->prev.integer = *(gint *)entry->arg_data;
      *(gint *)entry->arg_data = data;
      break;
      }
    case G_OPTION_ARG_CALLBACK:
      {
      gchar *tmp;
      gboolean retval;
      
      tmp = g_locale_to_utf8 (value, -1, NULL, NULL, error);

      if (!value)
        return FALSE;

      retval = (* (GOptionArgFunc) entry->arg_data) (option_name, tmp, group->user_data, error);
      
      g_free (tmp);
      
      return retval;
      
      break;
      }
    default:
      g_assert_not_reached ();
    }

  return TRUE;
}

static gboolean
parse_short_option (GOptionContext *context,
                GOptionGroup   *group,
                gint            index,
                gint           *new_index,
                gchar           arg,
                gint           *argc,
                gchar        ***argv,
                GError        **error,
                gboolean       *parsed)
{
  gint j;
    
  for (j = 0; j < group->n_entries; j++)
    {
      if (arg == group->entries[j].short_name)
      {
        if (group->entries[j].arg == G_OPTION_ARG_NONE)
          {
            parse_arg (context, group, &group->entries[j],
                   NULL, NULL, error);
            *parsed = TRUE;
          }
        else
          {
            gchar *value = NULL;
            gchar *option_name;
            
            if (*new_index > index)
            {
              g_warning ("FIXME: figure out the correct error here");

              return FALSE;
            }
            
            if (index < *argc - 1)
            {
              value = (*argv)[index + 1];
              add_pending_null (context, &((*argv)[index + 1]), NULL);
              *new_index = index + 1;
            }
            else
            value = "";


            option_name = g_strdup_printf ("-%c", group->entries[j].short_name);
            
            if (!parse_arg (context, group, &group->entries[j], value, option_name, error))
            {
              g_free (option_name);
              return FALSE;
            }

            g_free (option_name);
            *parsed = TRUE;
          }
      }
    }

  return TRUE;
}

static gboolean
parse_long_option (GOptionContext *context,
               GOptionGroup   *group,
               gint           *index,
               gchar          *arg,
               gint           *argc,
               gchar        ***argv,
               GError        **error,
               gboolean       *parsed)
{
  gint j;

  for (j = 0; j < group->n_entries; j++)
    {
      if (*index >= *argc)
      return TRUE;

      if (group->entries[j].arg == G_OPTION_ARG_NONE &&
        strcmp (arg, group->entries[j].long_name) == 0)
      {
        parse_arg (context, group, &group->entries[j],
                 NULL, NULL, error);
        
        add_pending_null (context, &((*argv)[*index]), NULL);
        *parsed = TRUE;
      }
      else
      {
        gint len = strlen (group->entries[j].long_name);
        
        if (strncmp (arg, group->entries[j].long_name, len) == 0 &&
            (arg[len] == '=' || arg[len] == 0))
          {
            gchar *value = NULL;
            gchar *option_name;

            add_pending_null (context, &((*argv)[*index]), NULL);
            
            if (arg[len] == '=')
            value = arg + len + 1;
            else if (*index < *argc - 1)
            {
              value = (*argv)[*index + 1];
              add_pending_null (context, &((*argv)[*index + 1]), NULL);
              (*index)++;
            }
            else
            value = "";

            option_name = g_strconcat ("--", group->entries[j].long_name, NULL);
            
            if (!parse_arg (context, group, &group->entries[j], value, option_name, error))
            {
              g_free (option_name);
              return FALSE;
            }

            g_free (option_name);
            *parsed = TRUE;
          }
      }
    }
  
  return TRUE;
}

static void
free_changes_list (GOptionContext *context,
               gboolean        revert)
{
  GList *list;

  for (list = context->changes; list != NULL; list = list->next)
    {
      Change *change = list->data;

      if (revert)
      {
        switch (change->arg_type)
          {
          case G_OPTION_ARG_NONE:
            *(gboolean *)change->arg_data = change->prev.bool;
            break;
          case G_OPTION_ARG_INT:
            *(gint *)change->arg_data = change->prev.integer;
            break;
          case G_OPTION_ARG_STRING:
          case G_OPTION_ARG_FILENAME:
              g_free (change->allocated.str);
            *(gchar **)change->arg_data = change->prev.str;
            break;
          case G_OPTION_ARG_STRING_ARRAY:
          case G_OPTION_ARG_FILENAME_ARRAY:
            g_strfreev (change->allocated.array.data);
            *(gchar ***)change->arg_data = change->prev.array;
            break;
          default:
            g_assert_not_reached ();
          }
      }
      
      g_free (change);
    }

  g_list_free (context->changes);
  context->changes = NULL;
}

static void
free_pending_nulls (GOptionContext *context,
                gboolean        perform_nulls)
{
  GList *list;

  for (list = context->pending_nulls; list != NULL; list = list->next)
    {
      PendingNull *n = list->data;

      if (perform_nulls)
      {
        if (n->value)
          {
            /* Copy back the short options */
            *(n->ptr)[0] = '-';           
            strcpy (*n->ptr + 1, n->value);
          }
        else
          *n->ptr = NULL;
      }
      
      g_free (n->value);
      g_free (n);
    }

  g_list_free (context->pending_nulls);
  context->pending_nulls = NULL;
}

gboolean
g_option_context_parse (GOptionContext   *context,
                  gint             *argc,
                  gchar          ***argv,
                  GError          **error)
{
  gint i, j, k;
  GList *list;

  /* Set program name */
  if (argc && argv && *argc)
    {
      gchar *prgname;
      
      prgname = g_path_get_basename ((*argv)[0]);
      g_set_prgname (prgname);
      g_free (prgname);
    }
  else
    {
      g_set_prgname ("<unknown>");
    }
  
  /* Call pre-parse hooks */
  list = context->groups;
  while (list)
    {
      GOptionGroup *group = list->data;
      
      if (group->pre_parse_func)
      {
        if (!(* group->pre_parse_func) (context, group,
                                group->user_data, error))
          goto fail;
      }
      
      list = list->next;
    }

  if (context->main_group && context->main_group->pre_parse_func)
    {
      if (!(* context->main_group->pre_parse_func) (context, context->main_group,
                                        context->main_group->user_data, error))
      goto fail;
    }

  if (argc && argv)
    {
      for (i = 1; i < *argc; i++)
      {
        gchar *arg;
        gboolean parsed = FALSE;

        if ((*argv)[i][0] == '-')
          {
            if ((*argv)[i][1] == '-')
            {
              /* -- option */

              arg = (*argv)[i] + 2;

              /* '--' terminates list of arguments */
              if (*arg == 0)
                {
                  add_pending_null (context, &((*argv)[i]), NULL);
                  break;
                }

              /* Handle help options */
              if (context->help_enabled)
                {
                  if (strcmp (arg, "help") == 0)
                  print_help (context, TRUE, NULL);
                  else if (strcmp (arg, "help-all") == 0)
                  print_help (context, FALSE, NULL);              
                  else if (strncmp (arg, "help-", 5) == 0)
                  {
                    GList *list;
                    
                    list = context->groups;
                    
                    while (list)
                      {
                        GOptionGroup *group = list->data;
                        
                        if (strcmp (arg + 5, group->name) == 0)
                        print_help (context, FALSE, group);                                     
                        
                        list = list->next;
                      }
                  }
                }

              if (context->main_group &&
                  !parse_long_option (context, context->main_group, &i, arg,
                                argc, argv, error, &parsed))
                goto fail;

              if (parsed)
                continue;
              
              /* Try the groups */
              list = context->groups;
              while (list)
                {
                  GOptionGroup *group = list->data;
                  
                  if (!parse_long_option (context, group, &i, arg,
                                    argc, argv, error, &parsed))
                  goto fail;
                  
                  if (parsed)
                  break;
                  
                  list = list->next;
                }

              if (context->ignore_unknown)
                continue;
            }
            else
            {
              gint new_i, j;
              gboolean *nulled_out = NULL;
              
              arg = (*argv)[i] + 1;

              new_i = i;

              if (context->ignore_unknown)
                nulled_out = g_new0 (gboolean, strlen (arg));
              
              for (j = 0; j < strlen (arg); j++)
                {
                  parsed = FALSE;
                  
                  if (context->main_group &&
                    !parse_short_option (context, context->main_group,
                                     i, &new_i, arg[j],
                                     argc, argv, error, &parsed))
                  {

                    g_free (nulled_out);
                    goto fail;
                  }

                  if (!parsed)
                  {
                    /* Try the groups */
                    list = context->groups;
                    while (list)
                      {
                        GOptionGroup *group = list->data;
                        
                        if (!parse_short_option (context, group, i, &new_i, arg[j],
                                           argc, argv, error, &parsed))
                        goto fail;
                        
                        if (parsed)
                        break;
                    
                        list = list->next;
                      }
                  }

                  if (context->ignore_unknown)
                  {
                    if (parsed)
                      nulled_out[j] = TRUE;
                    else
                      continue;
                  }

                  if (!parsed)
                  break;
                }

              if (context->ignore_unknown)
                {
                  gchar *new_arg = NULL; 
                  gint arg_index = 0;
                  
                  for (j = 0; j < strlen (arg); j++)
                  {
                    if (!nulled_out[j])
                      {
                        if (!new_arg)
                        new_arg = g_malloc (strlen (arg));
                        new_arg[arg_index++] = arg[j];
                      }
                  }
                  if (new_arg)
                  new_arg[arg_index] = '\0';
                  
                  add_pending_null (context, &((*argv)[i]), new_arg);
                }
              else if (parsed)
                {
                  add_pending_null (context, &((*argv)[i]), NULL);
                  i = new_i;
                }
            }
            
            if (!parsed && !context->ignore_unknown)
            {
              g_set_error (error,
                         G_OPTION_ERROR, G_OPTION_ERROR_UNKNOWN_OPTION,
                         _("Unknown option %s"), (*argv)[i]);
              goto fail;
            }
          }
      }

      /* Call post-parse hooks */
      list = context->groups;
      while (list)
      {
        GOptionGroup *group = list->data;

        if (group->post_parse_func)
          {
            if (!(* group->post_parse_func) (context, group,
                                     group->user_data, error))
            goto fail;
          }
        
        list = list->next;
      }

      if (context->main_group && context->main_group->post_parse_func)
      {
        if (!(* context->main_group->post_parse_func) (context, context->main_group,
                                           context->main_group->user_data, error))
          goto fail;
      }

      free_pending_nulls (context, TRUE);
      
      for (i = 1; i < *argc; i++)
      {
        for (k = i; k < *argc; k++)
          if ((*argv)[k] != NULL)
            break;
        
        if (k > i)
          {
            k -= i;
            for (j = i + k; j < *argc; j++)
            (*argv)[j-k] = (*argv)[j];
            *argc -= k;
          }
      }      
    }

  return TRUE;

 fail:
  
  /* Call error hooks */
  list = context->groups;
  while (list)
    {
      GOptionGroup *group = list->data;
      
      if (group->error_func)
      (* group->error_func) (context, group,
                         group->user_data, error);
      
      list = list->next;
    }

  if (context->main_group && context->main_group->error_func)
    (* context->main_group->error_func) (context, context->main_group,
                               context->main_group->user_data, error);
  
  free_changes_list (context, TRUE);
  free_pending_nulls (context, FALSE);

  return FALSE;
}
                           
     
GOptionGroup *
g_option_group_new (const gchar    *name,
                const gchar    *description,
                const gchar    *help_description,
                gpointer        user_data,
                GDestroyNotify  destroy)

{
  GOptionGroup *group;

  group = g_new0 (GOptionGroup, 1);
  group->name = g_strdup (name);
  group->description = g_strdup (description);
  group->help_description = g_strdup (help_description);
  group->user_data = user_data;
  group->destroy_notify = destroy;
  
  return group;
}

void
g_option_group_free (GOptionGroup *group)
{
  g_return_if_fail (group != NULL);

  g_free (group->name);
  g_free (group->description);
  g_free (group->help_description);

  g_free (group->entries);
  
  if (group->destroy_notify)
    (* group->destroy_notify) (group->user_data);

  if (group->translate_notify)
    (* group->translate_notify) (group->translate_data);
  
  g_free (group);
}


void
g_option_group_add_entries (GOptionGroup       *group,
                      const GOptionEntry *entries)
{
  gint n_entries;
  
  g_return_if_fail (entries != NULL);

  for (n_entries = 0; entries[n_entries].long_name != NULL; n_entries++);

  group->entries = g_renew (GOptionEntry, group->entries, group->n_entries + n_entries);

  memcpy (group->entries + group->n_entries, entries, sizeof (GOptionEntry) * n_entries);

  group->n_entries += n_entries;
}

void
g_option_group_set_parse_hooks (GOptionGroup     *group,
                        GOptionParseFunc  pre_parse_func,
                        GOptionParseFunc  post_parse_func)
{
  g_return_if_fail (group != NULL);

  group->pre_parse_func = pre_parse_func;
  group->post_parse_func = post_parse_func;  
}

void
g_option_group_set_error_hook (GOptionGroup     *group,
                         GOptionErrorFunc  error_func)
{
  g_return_if_fail (group != NULL);

  group->error_func = error_func;  
}


void
g_option_group_set_translate_func (GOptionGroup   *group,
                           GTranslateFunc  func,
                           gpointer        data,
                           GDestroyNotify  notify)
{
  g_return_if_fail (group != NULL);
  
  if (group->translate_notify)
    group->translate_notify (group->translate_data);
      
  group->translate_func = func;
  group->translate_data = data;
  group->translate_notify = notify;
}

static gchar *
dgettext_swapped (const gchar *msgid, 
              const gchar *domainname)
{
  return dgettext (domainname, msgid);
}

void
g_option_group_set_translation_domain (GOptionGroup *group,
                               const gchar  *domain)
{
  g_return_if_fail (group != NULL);

  g_option_group_set_translate_func (group, 
                             (GTranslateFunc)dgettext_swapped,
                             g_strdup (domain),
                             g_free);
} 
#endif

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