gio/gdesktopappinfo.c

/* GIO - GLib Input, Output and Streaming Library
 * 
 * Copyright (C) 2006-2007 Red Hat, Inc.
 * Copyright © 2007 Ryan Lortie
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser 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.
 *
 * Author: Alexander Larsson <alexl@redhat.com>
 */

#include <config.h>

#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <sys/wait.h>

#ifdef HAVE_CRT_EXTERNS_H
#include <crt_externs.h>
#endif

#include "gcontenttypeprivate.h"
#include "gdesktopappinfo.h"
#include "gioerror.h"
#include "gthemedicon.h"
#include "gfileicon.h"
#include <glib/gstdio.h>
#include "glibintl.h"
#include "giomodule-priv.h"

#include "gioalias.h"

/**
 * SECTION:gdesktopappinfo
 * @short_description: Application information from desktop files
 * @include: gio/gdesktopappinfo.h 
 * 
 * #GDesktopAppInfo is an implementation of #GAppInfo based on
 * desktop files.
 *
 **/

#define DEFAULT_APPLICATIONS_GROUP  "Default Applications" 
#define ADDED_ASSOCIATIONS_GROUP    "Added Associations" 
#define REMOVED_ASSOCIATIONS_GROUP  "Removed Associations" 
#define MIME_CACHE_GROUP            "MIME Cache"

static void     g_desktop_app_info_iface_init         (GAppInfoIface    *iface);
static GList *  get_all_desktop_entries_for_mime_type (const char       *base_mime_type);
static void     mime_info_cache_reload                (const char       *dir);
static gboolean g_desktop_app_info_ensure_saved       (GDesktopAppInfo  *info,
						       GError          **error);

/**
 * GDesktopAppInfo:
 * 
 * Information about an installed application from a desktop file.
 */
struct _GDesktopAppInfo
{
  GObject parent_instance;

  char *desktop_id;
  char *filename;

  char *name;
  /* FIXME: what about GenericName ? */
  char *comment;
  char *icon_name;
  GIcon *icon;
  char **only_show_in;
  char **not_show_in;
  char *try_exec;
  char *exec;
  char *binary;
  char *path;

  guint nodisplay       : 1;
  guint hidden          : 1;
  guint terminal        : 1;
  guint startup_notify  : 1;
  /* FIXME: what about StartupWMClass ? */
};

G_DEFINE_TYPE_WITH_CODE (GDesktopAppInfo, g_desktop_app_info, G_TYPE_OBJECT,
			 G_IMPLEMENT_INTERFACE (G_TYPE_APP_INFO,
						g_desktop_app_info_iface_init))

static gpointer
search_path_init (gpointer data)
{
  char **args = NULL;
  const char * const *data_dirs;
  const char *user_data_dir;
  int i, length, j;

  data_dirs = g_get_system_data_dirs ();
  length = g_strv_length ((char **) data_dirs);
  
  args = g_new (char *, length + 2);
  
  j = 0;
  user_data_dir = g_get_user_data_dir ();
  args[j++] = g_build_filename (user_data_dir, "applications", NULL);
  for (i = 0; i < length; i++)
    args[j++] = g_build_filename (data_dirs[i],
				  "applications", NULL);
  args[j++] = NULL;
  
  return args;
}
  
static const char * const *
get_applications_search_path (void)
{
  static GOnce once_init = G_ONCE_INIT;
  return g_once (&once_init, search_path_init, NULL);
}

static void
g_desktop_app_info_finalize (GObject *object)
{
  GDesktopAppInfo *info;

  info = G_DESKTOP_APP_INFO (object);

  g_free (info->desktop_id);
  g_free (info->filename);
  g_free (info->name);
  g_free (info->comment);
  g_free (info->icon_name);
  if (info->icon)
    g_object_unref (info->icon);
  g_strfreev (info->only_show_in);
  g_strfreev (info->not_show_in);
  g_free (info->try_exec);
  g_free (info->exec);
  g_free (info->binary);
  g_free (info->path);
  
  G_OBJECT_CLASS (g_desktop_app_info_parent_class)->finalize (object);
}

static void
g_desktop_app_info_class_init (GDesktopAppInfoClass *klass)
{
  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
  
  gobject_class->finalize = g_desktop_app_info_finalize;
}

static void
g_desktop_app_info_init (GDesktopAppInfo *local)
{
}

static char *
binary_from_exec (const char *exec)
{
  const char *p, *start;
  
  p = exec;
  while (*p == ' ')
    p++;
  start = p;
  while (*p != ' ' && *p != 0)
    p++;
  
  return g_strndup (start, p - start);
  
}

/**
 * g_desktop_app_info_new_from_filename:
 * @filename: a string containing a file name.
 * 
 * Creates a new #GDesktopAppInfo.
 *
 * Returns: a new #GDesktopAppInfo or %NULL on error.
 **/
GDesktopAppInfo *
g_desktop_app_info_new_from_filename (const char *filename)
{
  GDesktopAppInfo *info;
  GKeyFile *key_file;
  char *start_group;
  char *type;
  char *try_exec;
  
  key_file = g_key_file_new ();
  
  if (!g_key_file_load_from_file (key_file,
				  filename,
				  G_KEY_FILE_NONE,
				  NULL))
    {
      g_key_file_free (key_file);
      return NULL;
    }

  start_group = g_key_file_get_start_group (key_file);
  if (start_group == NULL || strcmp (start_group, G_KEY_FILE_DESKTOP_GROUP) != 0)
    {
      g_free (start_group);
      g_key_file_free (key_file);
      return NULL;
    }
  g_free (start_group);

  type = g_key_file_get_string (key_file,
                                G_KEY_FILE_DESKTOP_GROUP,
                                G_KEY_FILE_DESKTOP_KEY_TYPE,
                                NULL);
  if (type == NULL || strcmp (type, G_KEY_FILE_DESKTOP_TYPE_APPLICATION) != 0)
    {
      g_free (type);
      g_key_file_free (key_file);
      return NULL;
    }
  g_free (type);

  try_exec = g_key_file_get_string (key_file,
                                    G_KEY_FILE_DESKTOP_GROUP,
                                    G_KEY_FILE_DESKTOP_KEY_TRY_EXEC,
                                    NULL);
  if (try_exec)
    {
      char *t;
      t = g_find_program_in_path (try_exec);
      if (t == NULL)
	{
	  g_free (try_exec);
	  g_key_file_free (key_file);
	  return NULL;
	}
      g_free (t);
    }

  info = g_object_new (G_TYPE_DESKTOP_APP_INFO, NULL);
  info->filename = g_strdup (filename);

  info->name = g_key_file_get_locale_string (key_file, G_KEY_FILE_DESKTOP_GROUP, G_KEY_FILE_DESKTOP_KEY_NAME, NULL, NULL);
  info->comment = g_key_file_get_locale_string (key_file, G_KEY_FILE_DESKTOP_GROUP, G_KEY_FILE_DESKTOP_KEY_COMMENT, NULL, NULL);
  info->nodisplay = g_key_file_get_boolean (key_file, G_KEY_FILE_DESKTOP_GROUP, G_KEY_FILE_DESKTOP_KEY_NO_DISPLAY, NULL) != FALSE;
  info->icon_name =  g_key_file_get_locale_string (key_file, G_KEY_FILE_DESKTOP_GROUP, G_KEY_FILE_DESKTOP_KEY_ICON, NULL, NULL);
  info->only_show_in = g_key_file_get_string_list (key_file, G_KEY_FILE_DESKTOP_GROUP, G_KEY_FILE_DESKTOP_KEY_ONLY_SHOW_IN, NULL, NULL);
  info->not_show_in = g_key_file_get_string_list (key_file, G_KEY_FILE_DESKTOP_GROUP, G_KEY_FILE_DESKTOP_KEY_NOT_SHOW_IN, NULL, NULL);
  info->try_exec = try_exec;
  info->exec = g_key_file_get_string (key_file, G_KEY_FILE_DESKTOP_GROUP, G_KEY_FILE_DESKTOP_KEY_EXEC, NULL);
  info->path = g_key_file_get_string (key_file, G_KEY_FILE_DESKTOP_GROUP, G_KEY_FILE_DESKTOP_KEY_PATH, NULL);
  info->terminal = g_key_file_get_boolean (key_file, G_KEY_FILE_DESKTOP_GROUP, G_KEY_FILE_DESKTOP_KEY_TERMINAL, NULL) != FALSE;
  info->startup_notify = g_key_file_get_boolean (key_file, G_KEY_FILE_DESKTOP_GROUP, G_KEY_FILE_DESKTOP_KEY_STARTUP_NOTIFY, NULL) != FALSE;
  info->hidden = g_key_file_get_boolean (key_file, G_KEY_FILE_DESKTOP_GROUP, G_KEY_FILE_DESKTOP_KEY_HIDDEN, NULL) != FALSE;

  g_key_file_free (key_file);
  
  info->icon = NULL;
  if (info->icon_name)
    {
      if (g_path_is_absolute (info->icon_name))
	{
	  GFile *file;
	  
	  file = g_file_new_for_path (info->icon_name);
	  info->icon = g_file_icon_new (file);
	  g_object_unref (file);
	}
      else
	info->icon = g_themed_icon_new (info->icon_name);
    }
  
  if (info->exec)
    info->binary = binary_from_exec (info->exec);
  
  return info;
}

/**
 * g_desktop_app_info_new:
 * @desktop_id: the desktop file id
 * 
 * Creates a new #GDesktopAppInfo.
 * 
 * Returns: a new #GDesktopAppInfo, or %NULL if no desktop file with that id
 **/
GDesktopAppInfo *
g_desktop_app_info_new (const char *desktop_id)
{
  GDesktopAppInfo *appinfo;
  const char * const *dirs;
  char *basename;
  int i;

  dirs = get_applications_search_path ();

  basename = g_strdup (desktop_id);
  
  for (i = 0; dirs[i] != NULL; i++)
    {
      char *filename;
      char *p;

      filename = g_build_filename (dirs[i], desktop_id, NULL);
      appinfo = g_desktop_app_info_new_from_filename (filename);
      g_free (filename);
      if (appinfo != NULL)
	goto found;

      p = basename;
      while ((p = strchr (p, '-')) != NULL)
	{
	  *p = '/';
	  
	  filename = g_build_filename (dirs[i], basename, NULL);
	  appinfo = g_desktop_app_info_new_from_filename (filename);
	  g_free (filename);
	  if (appinfo != NULL)
	    goto found;
	  *p = '-';
	  p++;
	}
    }
  
  g_free (basename);
  return NULL;

 found:
  g_free (basename);
  
  appinfo->desktop_id = g_strdup (desktop_id);

  if (g_desktop_app_info_get_is_hidden (appinfo))
    {
      g_object_unref (appinfo);
      appinfo = NULL;
    }
  
  return appinfo;
}

static GAppInfo *
g_desktop_app_info_dup (GAppInfo *appinfo)
{
  GDesktopAppInfo *info = G_DESKTOP_APP_INFO (appinfo);
  GDesktopAppInfo *new_info;
  
  new_info = g_object_new (G_TYPE_DESKTOP_APP_INFO, NULL);

  new_info->filename = g_strdup (info->filename);
  new_info->desktop_id = g_strdup (info->desktop_id);
  
  new_info->name = g_strdup (info->name);
  new_info->comment = g_strdup (info->comment);
  new_info->nodisplay = info->nodisplay;
  new_info->icon_name = g_strdup (info->icon_name);
  new_info->icon = g_object_ref (info->icon);
  new_info->only_show_in = g_strdupv (info->only_show_in);
  new_info->not_show_in = g_strdupv (info->not_show_in);
  new_info->try_exec = g_strdup (info->try_exec);
  new_info->exec = g_strdup (info->exec);
  new_info->binary = g_strdup (info->binary);
  new_info->path = g_strdup (info->path);
  new_info->hidden = info->hidden;
  new_info->terminal = info->terminal;
  new_info->startup_notify = info->startup_notify;
  
  return G_APP_INFO (new_info);
}

static gboolean
g_desktop_app_info_equal (GAppInfo *appinfo1,
			  GAppInfo *appinfo2)
{
  GDesktopAppInfo *info1 = G_DESKTOP_APP_INFO (appinfo1);
  GDesktopAppInfo *info2 = G_DESKTOP_APP_INFO (appinfo2);

  if (info1->desktop_id == NULL ||
      info2->desktop_id == NULL)
    return info1 == info2;

  return strcmp (info1->desktop_id, info2->desktop_id) == 0;
}

static const char *
g_desktop_app_info_get_id (GAppInfo *appinfo)
{
  GDesktopAppInfo *info = G_DESKTOP_APP_INFO (appinfo);

  return info->desktop_id;
}

static const char *
g_desktop_app_info_get_name (GAppInfo *appinfo)
{
  GDesktopAppInfo *info = G_DESKTOP_APP_INFO (appinfo);

  if (info->name == NULL)
    return _("Unnamed");
  return info->name;
}

/**
 * g_desktop_app_info_get_is_hidden:
 * @info: a #GDesktopAppInfo.
 *
 * A desktop file is hidden if the Hidden key in it is
 * set to True.
 *
 * Returns: %TRUE if hidden, %FALSE otherwise. 
 **/
gboolean
g_desktop_app_info_get_is_hidden (GDesktopAppInfo *info)
{
  return info->hidden;
}

static const char *
g_desktop_app_info_get_description (GAppInfo *appinfo)
{
  GDesktopAppInfo *info = G_DESKTOP_APP_INFO (appinfo);
  
  return info->comment;
}

static const char *
g_desktop_app_info_get_executable (GAppInfo *appinfo)
{
  GDesktopAppInfo *info = G_DESKTOP_APP_INFO (appinfo);
  
  return info->binary;
}

static GIcon *
g_desktop_app_info_get_icon (GAppInfo *appinfo)
{
  GDesktopAppInfo *info = G_DESKTOP_APP_INFO (appinfo);

  return info->icon;
}

static char *
expand_macro_single (char macro, char *uri)
{
  GFile *file;
  char *result = NULL;
  char *path;

  file = g_file_new_for_uri (uri);
  path = g_file_get_path (file);
  g_object_unref (file);
  
  switch (macro)
    {
    case 'u':
    case 'U':	
      result = g_shell_quote (uri);
      break;
    case 'f':
    case 'F':
      if (path)
	result = g_shell_quote (path);
      break;
    case 'd':
    case 'D':
      if (path)
	result = g_shell_quote (g_path_get_dirname (path));
      break;
    case 'n':
    case 'N':
      if (path)
	result = g_shell_quote (g_path_get_basename (path));
      break;
    }

  g_free (path);
  
  return result;
}

static void
expand_macro (char              macro, 
              GString          *exec, 
              GDesktopAppInfo  *info, 
              GList           **uri_list)
{
  GList *uris = *uri_list;
  char *expanded;
  
  g_return_if_fail (exec != NULL);
  
  switch (macro)
    {
    case 'u':
    case 'f':
    case 'd':
    case 'n':
      if (uris)
	{
	  expanded = expand_macro_single (macro, uris->data);
	  if (expanded)
	    {
	      g_string_append (exec, expanded);
	      g_free (expanded);
	    }
	  uris = uris->next;
	}

      break;

    case 'U':	
    case 'F':
    case 'D':
    case 'N':
      while (uris)
	{
	  expanded = expand_macro_single (macro, uris->data);
	  if (expanded)
	    {
	      g_string_append (exec, expanded);
	      g_free (expanded);
	    }
	  
	  uris = uris->next;
	  
	  if (uris != NULL && expanded)
	    g_string_append_c (exec, ' ');
	}

      break;

    case 'i':
      if (info->icon_name)
	{
	  g_string_append (exec, "--icon ");
	  g_string_append (exec, info->icon_name);
	}
      break;

    case 'c':
      if (info->name) 
	g_string_append (exec, info->name);
      break;

    case 'k':
      if (info->filename) 
	g_string_append (exec, info->filename);
      break;

    case 'm': /* deprecated */
      break;

    case '%':
      g_string_append_c (exec, '%');
      break;
    }
  
  *uri_list = uris;
}

static gboolean
expand_application_parameters (GDesktopAppInfo   *info,
			       GList            **uris,
			       int               *argc,
			       char            ***argv,
			       GError           **error)
{
  GList *uri_list = *uris;
  const char *p = info->exec;
  GString *expanded_exec = g_string_new (NULL);
  gboolean res;
  
  if (info->exec == NULL)
    {
      g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
		   _("Desktop file didn't specify Exec field"));
      return FALSE;
    }
  
  while (*p)
    {
      if (p[0] == '%' && p[1] != '\0')
	{
	  expand_macro (p[1], expanded_exec, info, uris);
	  p++;
	}
      else
	g_string_append_c (expanded_exec, *p);
      
      p++;
    }
  
  /* No file substitutions */
  if (uri_list == *uris && uri_list != NULL)
    {
      /* If there is no macro default to %f. This is also what KDE does */
      g_string_append_c (expanded_exec, ' ');
      expand_macro ('f', expanded_exec, info, uris);
    }
  
  res = g_shell_parse_argv (expanded_exec->str, argc, argv, error);
  g_string_free (expanded_exec, TRUE);
  return res;
}

static gboolean
prepend_terminal_to_vector (int    *argc,
			    char ***argv)
{
#ifndef G_OS_WIN32
  char **real_argv;
  int real_argc;
  int i, j;
  char **term_argv = NULL;
  int term_argc = 0;
  char *check;
  char **the_argv;
  
  g_return_val_if_fail (argc != NULL, FALSE);
  g_return_val_if_fail (argv != NULL, FALSE);
	
  /* sanity */
  if(*argv == NULL)
    *argc = 0;
  
  the_argv = *argv;

  /* compute size if not given */
  if (*argc < 0)
    {
      for (i = 0; the_argv[i] != NULL; i++)
	;
      *argc = i;
    }
  
  term_argc = 2;
  term_argv = g_new0 (char *, 3);

  check = g_find_program_in_path ("gnome-terminal");
  if (check != NULL)
    {
      term_argv[0] = check;
      /* Note that gnome-terminal takes -x and
       * as -e in gnome-terminal is broken we use that. */
      term_argv[1] = g_strdup ("-x");
    }
  else
    {
      if (check == NULL)
	check = g_find_program_in_path ("nxterm");
      if (check == NULL)
	check = g_find_program_in_path ("color-xterm");
      if (check == NULL)
	check = g_find_program_in_path ("rxvt");
      if (check == NULL)
	check = g_find_program_in_path ("xterm");
      if (check == NULL)
	check = g_find_program_in_path ("dtterm");
      if (check == NULL)
	{
	  check = g_strdup ("xterm");
	  g_warning ("couldn't find a terminal, falling back to xterm");
	}
      term_argv[0] = check;
      term_argv[1] = g_strdup ("-e");
    }

  real_argc = term_argc + *argc;
  real_argv = g_new (char *, real_argc + 1);
  
  for (i = 0; i < term_argc; i++)
    real_argv[i] = term_argv[i];
  
  for (j = 0; j < *argc; j++, i++)
    real_argv[i] = (char *)the_argv[j];
  
  real_argv[i] = NULL;
  
  g_free (*argv);
  *argv = real_argv;
  *argc = real_argc;
  
  /* we use g_free here as we sucked all the inner strings
   * out from it into real_argv */
  g_free (term_argv);
  return TRUE;
#else
  return FALSE;
#endif /* G_OS_WIN32 */
}

/* '=' is the new '\0'.
 * DO NOT CALL unless at least one string ends with '='
 */
static gboolean
is_env (const char *a,
	const char *b)
{
  while (*a == *b)
  {
    if (*a == 0 || *b == 0)
      return FALSE;
    
    if (*a == '=')
      return TRUE;

    a++;
    b++;
  }

  return FALSE;
}

/* free with g_strfreev */
static char **
replace_env_var (char       **old_environ,
		 const char  *env_var,
		 const char  *new_value)
{
  int length, new_length;
  int index, new_index;
  char **new_environ;
  int i, new_i;

  /* do two things at once:
   *  - discover the length of the environment ('length')
   *  - find the location (if any) of the env var ('index')
   */
  index = -1;
  for (length = 0; old_environ[length]; length++)
    {
      /* if we already have it in our environment, replace */
      if (is_env (old_environ[length], env_var))
	index = length;
    }

  
  /* no current env var, no desired env value.
   * this is easy :)
   */
  if (new_value == NULL && index == -1)
    return old_environ;

  /* in all cases now, we will be using a modified environment.
   * determine its length and allocated it.
   * 
   * after this block:
   *   new_index   = location to insert, if any
   *   new_length  = length of the new array
   *   new_environ = the pointer array for the new environment
   */
  
  if (new_value == NULL && index >= 0)
    {
      /* in this case, we will be removing an entry */
      new_length = length - 1;
      new_index = -1;
    }
  else if (new_value != NULL && index < 0)
    {
      /* in this case, we will be adding an entry to the end */
      new_length = length + 1;
      new_index = length;
    }
  else
    /* in this case, we will be replacing the existing entry */
    {
      new_length = length;
      new_index = index;
    }

  new_environ = g_malloc (sizeof (char *) * (new_length + 1));
  new_environ[new_length] = NULL;

  /* now we do the copying.
   * for each entry in the new environment, we decide what to do
   */
  
  i = 0;
  for (new_i = 0; new_i < new_length; new_i++)
    {
      if (new_i == new_index)
	{
	  /* insert our new item */
	  new_environ[new_i] = g_strconcat (env_var,
					    "=",
					    new_value,
					    NULL);
	  
	  /* if we had an old entry, skip it now */
	  if (index >= 0)
	    i++;
	}
      else
	{
	  /* if this is the old DESKTOP_STARTUP_ID, skip it */
	  if (i == index)
	    i++;
	  
	  /* copy an old item */
	  new_environ[new_i] = g_strdup (old_environ[i]);
	  i++;
	}
    }

  g_strfreev (old_environ);
  
  return new_environ;
}

static GList *
uri_list_segment_to_files (GList *start,
			   GList *end)
{
  GList *res;
  GFile *file;

  res = NULL;
  while (start != NULL && start != end)
    {
      file = g_file_new_for_uri ((char *)start->data);
      res = g_list_prepend (res, file);
      start = start->next;
    }

  return g_list_reverse (res);
}

#ifdef HAVE__NSGETENVIRON
#define environ (*_NSGetEnviron())
#elif !defined(G_OS_WIN32)

/* According to the Single Unix Specification, environ is not in 
 *  * any system header, although unistd.h often declares it.
 *   */
extern char **environ;
#endif

static gboolean
g_desktop_app_info_launch_uris (GAppInfo           *appinfo,
				GList              *uris,
				GAppLaunchContext  *launch_context,
				GError            **error)
{
  GDesktopAppInfo *info = G_DESKTOP_APP_INFO (appinfo);
  gboolean completed = FALSE;
  GList *old_uris;
  GList *launched_files;
  char **envp;
  char **argv;
  int argc;
  char *display;
  char *sn_id;

  g_return_val_if_fail (appinfo != NULL, FALSE);

  argv = NULL;
  envp = NULL;
      
  do 
    {
      old_uris = uris;
      if (!expand_application_parameters (info, &uris,
					  &argc, &argv, error))
	goto out;
      
      if (info->terminal && !prepend_terminal_to_vector (&argc, &argv))
	{
	  g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
		       _("Unable to find terminal required for application"));
	  goto out;
	}

      sn_id = NULL;
      if (launch_context)
	{
	  launched_files = uri_list_segment_to_files (old_uris, uris);
	  
	  display = g_app_launch_context_get_display (launch_context,
						      appinfo,
						      launched_files);

	  sn_id = NULL;
	  if (info->startup_notify)
	    sn_id = g_app_launch_context_get_startup_notify_id (launch_context,
								appinfo,
								launched_files);
	  
	  if (display || sn_id)
	    {
#ifdef G_OS_WIN32
	      /* FIXME */
	      envp = g_new0 (char *, 1);
#else
	      envp = g_strdupv (environ);
#endif
	      
	      if (display)
		envp = replace_env_var (envp,
					"DISPLAY",
					display);
	      
	      if (sn_id)
		envp = replace_env_var (envp,
					"DESKTOP_STARTUP_ID",
					sn_id);
	    }

	  g_free (display);
	  
	  g_list_foreach (launched_files, (GFunc)g_object_unref, NULL);
	  g_list_free (launched_files);
	}
      
      if (!g_spawn_async (info->path,  /* working directory */
			  argv,
			  envp,
			  G_SPAWN_SEARCH_PATH /* flags */,
			  NULL /* child_setup */,
			  NULL /* data */,
			  NULL /* child_pid */,
			  error))
	{
	  if (sn_id)
	    {
	      g_app_launch_context_launch_failed (launch_context, sn_id);
	      g_free (sn_id);
	    }
	  goto out;
	}

      
      g_free (sn_id);
      
      g_strfreev (envp);
      g_strfreev (argv);
      envp = NULL;
      argv = NULL;
    }
  while (uris != NULL);

  completed = TRUE;

 out:
  g_strfreev (argv);
  g_strfreev (envp);

  return completed;
}

static gboolean
g_desktop_app_info_supports_uris (GAppInfo *appinfo)
{
  GDesktopAppInfo *info = G_DESKTOP_APP_INFO (appinfo);
 
  return info->exec && 
    ((strstr (info->exec, "%u") != NULL) ||
     (strstr (info->exec, "%U") != NULL));
}

static gboolean
g_desktop_app_info_supports_files (GAppInfo *appinfo)
{
  GDesktopAppInfo *info = G_DESKTOP_APP_INFO (appinfo);
 
  return info->exec && 
    ((strstr (info->exec, "%f") != NULL) ||
     (strstr (info->exec, "%F") != NULL));
}

static gboolean
g_desktop_app_info_launch (GAppInfo           *appinfo,
			   GList              *files,
			   GAppLaunchContext  *launch_context,
			   GError            **error)
{
  GList *uris;
  char *uri;
  gboolean res;

  uris = NULL;
  while (files)
    {
      uri = g_file_get_uri (files->data);
      uris = g_list_prepend (uris, uri);
      files = files->next;
    }
  
  uris = g_list_reverse (uris);
  
  res = g_desktop_app_info_launch_uris (appinfo, uris, launch_context, error);
  
  g_list_foreach  (uris, (GFunc)g_free, NULL);
  g_list_free (uris);
  
  return res;
}

G_LOCK_DEFINE_STATIC (g_desktop_env);
static gchar *g_desktop_env = NULL;

/**
 * g_desktop_app_info_set_desktop_env:
 * @desktop_env: a string specifying what desktop this is
 *
 * Sets the name of the desktop that the application is running in.
 * This is used by g_app_info_should_show() to evaluate the
 * <literal>OnlyShowIn</literal> and <literal>NotShowIn</literal>
 * desktop entry fields.
 *
 * The <ulink url="http://standards.freedesktop.org/menu-spec/latest/">Desktop 
 * Menu specification</ulink> recognizes the following:
 * <simplelist>
 *   <member>GNOME</member>
 *   <member>KDE</member>
 *   <member>ROX</member>
 *   <member>XFCE</member>
 *   <member>Old</member> 
 * </simplelist>
 *
 * Should be called only once; subsequent calls are ignored.
 */
void
g_desktop_app_info_set_desktop_env (const gchar *desktop_env)
{
  G_LOCK (g_desktop_env);
  if (!g_desktop_env)
    g_desktop_env = g_strdup (desktop_env);
  G_UNLOCK (g_desktop_env);
}

static gboolean
g_desktop_app_info_should_show (GAppInfo *appinfo)
{
  GDesktopAppInfo *info = G_DESKTOP_APP_INFO (appinfo);
  gboolean found;
  const gchar *desktop_env;
  int i;

  if (info->nodisplay)
    return FALSE;

  G_LOCK (g_desktop_env);
  desktop_env = g_desktop_env;
  G_UNLOCK (g_desktop_env);

  if (info->only_show_in)
    {
      if (desktop_env == NULL)
	return FALSE;
      
      found = FALSE;
      for (i = 0; info->only_show_in[i] != NULL; i++)
	{
	  if (strcmp (info->only_show_in[i], desktop_env) == 0)
	    {
	      found = TRUE;
	      break;
	    }
	}
      if (!found)
	return FALSE;
    }

  if (info->not_show_in && desktop_env)
    {
      for (i = 0; info->not_show_in[i] != NULL; i++)
	{
	  if (strcmp (info->not_show_in[i], desktop_env) == 0)
	    return FALSE;
	}
    }
  
  return TRUE;
}

typedef enum {
  APP_DIR,
  MIMETYPE_DIR
} DirType;

static char *
ensure_dir (DirType   type,
            GError  **error)
{
  char *path, *display_name;
  int errsv;

  if (type == APP_DIR)
    path = g_build_filename (g_get_user_data_dir (), "applications", NULL);
  else
    path = g_build_filename (g_get_user_data_dir (), "mime", "packages", NULL);

  errno = 0;
  if (g_mkdir_with_parents (path, 0700) == 0)
    return path;

  errsv = errno;
  display_name = g_filename_display_name (path);
  if (type == APP_DIR)
    g_set_error (error, G_IO_ERROR, g_io_error_from_errno (errsv),
                 _("Can't create user application configuration folder %s: %s"),
                 display_name, g_strerror (errsv));
  else
    g_set_error (error, G_IO_ERROR, g_io_error_from_errno (errsv),
                 _("Can't create user MIME configuration folder %s: %s"),
                 display_name, g_strerror (errsv));

  g_free (display_name);
  g_free (path);

  return NULL;
}

static gboolean
update_mimeapps_list (const char  *desktop_id, 
		      const char  *content_type, 
		      gboolean     add_at_start, 
		      gboolean     add_at_end, 
		      gboolean     remove, 
		      GError     **error)
{
  char *dirname, *filename;
  GKeyFile *key_file;
  gboolean load_succeeded, res;
  char **old_list;
  char **list;
  gsize length, data_size;
  char *data;
  int i, j;

  /* Don't add both at start and end */
  g_assert (!(add_at_start && add_at_end));
  
  dirname = ensure_dir (APP_DIR, error);
  if (!dirname)
    return FALSE;

  filename = g_build_filename (dirname, "mimeapps.list", NULL);
  g_free (dirname);

  key_file = g_key_file_new ();
  load_succeeded = g_key_file_load_from_file (key_file, filename, G_KEY_FILE_NONE, NULL);
  if (!load_succeeded || !g_key_file_has_group (key_file, ADDED_ASSOCIATIONS_GROUP))
    {
      g_key_file_free (key_file);
      key_file = g_key_file_new ();
    }

  /* Add to the right place in the list */
  
  length = 0;
  old_list = g_key_file_get_string_list (key_file, ADDED_ASSOCIATIONS_GROUP,
					 content_type, &length, NULL);

  list = g_new (char *, 1 + length + 1);

  i = 0;
  if (add_at_start)
    list[i++] = g_strdup (desktop_id);
  if (old_list)
    {
      for (j = 0; old_list[j] != NULL; j++)
	{
	  if (strcmp (old_list[j], desktop_id) != 0)
	    list[i++] = g_strdup (old_list[j]);
	}
    }
  if (add_at_end)
    list[i++] = g_strdup (desktop_id);
  list[i] = NULL;
  
  g_strfreev (old_list);

  g_key_file_set_string_list (key_file,
			      ADDED_ASSOCIATIONS_GROUP,
			      content_type,
			      (const char * const *)list, i);

  g_strfreev (list);

  /* Remove from removed associations group (unless remove) */
  
  length = 0;
  old_list = g_key_file_get_string_list (key_file, REMOVED_ASSOCIATIONS_GROUP,
					 content_type, &length, NULL);

  list = g_new (char *, 1 + length + 1);

  i = 0;
  if (remove)
    list[i++] = g_strdup (desktop_id);
  if (old_list)
    {
      for (j = 0; old_list[j] != NULL; j++)
	{
	  if (strcmp (old_list[j], desktop_id) != 0)
	    list[i++] = g_strdup (old_list[j]);
	}
    }
  list[i] = NULL;
  
  g_strfreev (old_list);

  if (list[0] == NULL)
    g_key_file_remove_key (key_file,
			   REMOVED_ASSOCIATIONS_GROUP,
			   content_type,
			   NULL);
  else
    g_key_file_set_string_list (key_file,
				REMOVED_ASSOCIATIONS_GROUP,
				content_type,
				(const char * const *)list, i);

  g_strfreev (list);

  
  data = g_key_file_to_data (key_file, &data_size, error);
  g_key_file_free (key_file);
  
  res = g_file_set_contents (filename, data, data_size, error);

  mime_info_cache_reload (NULL);
			  
  g_free (filename);
  g_free (data);
  
  return res;
}

static gboolean
g_desktop_app_info_set_as_default_for_type (GAppInfo    *appinfo,
					    const char  *content_type,
					    GError     **error)
{
  GDesktopAppInfo *info = G_DESKTOP_APP_INFO (appinfo);

  if (!g_desktop_app_info_ensure_saved (info, error))
    return FALSE;  
  
  return update_mimeapps_list (info->desktop_id, content_type, TRUE, FALSE, FALSE, error);
}

static void
update_program_done (GPid     pid,
		     gint     status,
		     gpointer data)
{
  /* Did the application exit correctly */
  if (WIFEXITED (status) &&
      WEXITSTATUS (status) == 0)
    {
      /* Here we could clean out any caches in use */
    }
}

static void
run_update_command (char *command,
		    char *subdir)
{
	char *argv[3] = {
		NULL,
		NULL,
		NULL,
	};
	GPid pid = 0;
	GError *error = NULL;

	argv[0] = command;
	argv[1] = g_build_filename (g_get_user_data_dir (), subdir, NULL);

	if (g_spawn_async ("/", argv,
			   NULL,       /* envp */
			   G_SPAWN_SEARCH_PATH |
			   G_SPAWN_STDOUT_TO_DEV_NULL |
			   G_SPAWN_STDERR_TO_DEV_NULL |
			   G_SPAWN_DO_NOT_REAP_CHILD,
			   NULL, NULL, /* No setup function */
			   &pid,
			   NULL)) 
	  g_child_watch_add (pid, update_program_done, NULL);
	else
	  {
	    /* If we get an error at this point, it's quite likely the user doesn't
	     * have an installed copy of either 'update-mime-database' or
	     * 'update-desktop-database'.  I don't think we want to popup an error
	     * dialog at this point, so we just do a g_warning to give the user a
	     * chance of debugging it.
	     */
	    g_warning ("%s", error->message);
	  }
	
	g_free (argv[1]);
}

static gboolean
g_desktop_app_info_set_as_default_for_extension (GAppInfo    *appinfo,
						 const char  *extension,
						 GError     **error)
{
  char *filename, *basename, *mimetype;
  char *dirname;
  gboolean res;

  if (!g_desktop_app_info_ensure_saved (G_DESKTOP_APP_INFO (appinfo), error))
    return FALSE;  
  
  dirname = ensure_dir (MIMETYPE_DIR, error);
  if (!dirname)
    return FALSE;
  
  basename = g_strdup_printf ("user-extension-%s.xml", extension);
  filename = g_build_filename (dirname, basename, NULL);
  g_free (basename);
  g_free (dirname);

  mimetype = g_strdup_printf ("application/x-extension-%s", extension);
  
  if (!g_file_test (filename, G_FILE_TEST_EXISTS)) 
    {
      char *contents;

      contents =
        g_strdup_printf ("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
                         "<mime-info xmlns=\"http://www.freedesktop.org/standards/shared-mime-info\">\n"
                         " <mime-type type=\"%s\">\n"
                         "  <comment>%s document</comment>\n"
                         "  <glob pattern=\"*.%s\"/>\n"
                         " </mime-type>\n"
                         "</mime-info>\n", mimetype, extension, extension);

      g_file_set_contents (filename, contents, -1, NULL);
      g_free (contents);

      run_update_command ("update-mime-database", "mime");
    }
  g_free (filename);
  
  res = g_desktop_app_info_set_as_default_for_type (appinfo,
						    mimetype,
						    error);

  g_free (mimetype);
  
  return res;
}

static gboolean
g_desktop_app_info_add_supports_type (GAppInfo    *appinfo,
				      const char  *content_type,
				      GError     **error)
{
  GDesktopAppInfo *info = G_DESKTOP_APP_INFO (appinfo);

  if (!g_desktop_app_info_ensure_saved (G_DESKTOP_APP_INFO (info), error))
    return FALSE;  
  
  return update_mimeapps_list (info->desktop_id, content_type, FALSE, TRUE, FALSE, error);
}

static gboolean
g_desktop_app_info_can_remove_supports_type (GAppInfo *appinfo)
{
  return TRUE;
}

static gboolean
g_desktop_app_info_remove_supports_type (GAppInfo    *appinfo,
					 const char  *content_type,
					 GError     **error)
{
  GDesktopAppInfo *info = G_DESKTOP_APP_INFO (appinfo);

  if (!g_desktop_app_info_ensure_saved (G_DESKTOP_APP_INFO (info), error))
    return FALSE;
  
  return update_mimeapps_list (info->desktop_id, content_type, FALSE, FALSE, TRUE, error);
}

static gboolean
g_desktop_app_info_ensure_saved (GDesktopAppInfo *info,
				 GError **error)
{
  GKeyFile *key_file;
  char *dirname;
  char *filename;
  char *data, *desktop_id;
  gsize data_size;
  int fd;
  gboolean res;
  
  if (info->filename != NULL)
    return TRUE;

  /* This is only used for object created with
   * g_app_info_create_from_commandline. All other
   * object should have a filename
   */
  
  dirname = ensure_dir (APP_DIR, error);
  if (!dirname)
    return FALSE;
  
  key_file = g_key_file_new ();

  g_key_file_set_string (key_file, G_KEY_FILE_DESKTOP_GROUP,
			 "Encoding", "UTF-8");
  g_key_file_set_string (key_file, G_KEY_FILE_DESKTOP_GROUP,
			 G_KEY_FILE_DESKTOP_KEY_VERSION, "1.0");
  g_key_file_set_string (key_file, G_KEY_FILE_DESKTOP_GROUP,
			 G_KEY_FILE_DESKTOP_KEY_TYPE,
                         G_KEY_FILE_DESKTOP_TYPE_APPLICATION);
  if (info->terminal) 
    g_key_file_set_boolean (key_file, G_KEY_FILE_DESKTOP_GROUP,
			    G_KEY_FILE_DESKTOP_KEY_TERMINAL, TRUE);

  g_key_file_set_string (key_file, G_KEY_FILE_DESKTOP_GROUP,
			 G_KEY_FILE_DESKTOP_KEY_EXEC, info->exec);

  g_key_file_set_string (key_file, G_KEY_FILE_DESKTOP_GROUP,
			 G_KEY_FILE_DESKTOP_KEY_NAME, info->name);

  g_key_file_set_string (key_file, G_KEY_FILE_DESKTOP_GROUP,
			 G_KEY_FILE_DESKTOP_KEY_COMMENT, info->comment);
  
  g_key_file_set_boolean (key_file, G_KEY_FILE_DESKTOP_GROUP,
			  G_KEY_FILE_DESKTOP_KEY_NO_DISPLAY, TRUE);

  data = g_key_file_to_data (key_file, &data_size, NULL);
  g_key_file_free (key_file);

  desktop_id = g_strdup_printf ("userapp-%s-XXXXXX.desktop", info->name);
  filename = g_build_filename (dirname, desktop_id, NULL);
  g_free (desktop_id);
  g_free (dirname);
  
  fd = g_mkstemp (filename);
  if (fd == -1)
    {
      char *display_name;

      display_name = g_filename_display_name (filename);
      g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
		   _("Can't create user desktop file %s"), display_name);
      g_free (display_name);
      g_free (filename);
      g_free (data);
      return FALSE;
    }

  desktop_id = g_path_get_basename (filename);

  close (fd);
  
  res = g_file_set_contents (filename, data, data_size, error);
  if (!res)
    {
      g_free (desktop_id);
      g_free (filename);
      return FALSE;
    }

  info->filename = filename;
  info->desktop_id = desktop_id;
  
  run_update_command ("update-desktop-database", "applications");
  
  return TRUE;
}

/**
 * g_app_info_create_from_commandline:
 * @commandline: the commandline to use
 * @application_name: the application name, or %NULL to use @commandline
 * @flags: flags that can specify details of the created #GAppInfo
 * @error: a #GError location to store the error occuring, %NULL to ignore.
 *
 * Creates a new #GAppInfo from the given information.
 *
 * Returns: new #GAppInfo for given command.
 **/
GAppInfo *
g_app_info_create_from_commandline (const char           *commandline,
				    const char           *application_name,
				    GAppInfoCreateFlags   flags,
				    GError              **error)
{
  char **split;
  char *basename;
  GDesktopAppInfo *info;

  info = g_object_new (G_TYPE_DESKTOP_APP_INFO, NULL);

  info->filename = NULL;
  info->desktop_id = NULL;
  
  info->terminal = flags & G_APP_INFO_CREATE_NEEDS_TERMINAL;
  info->startup_notify = FALSE;
  info->hidden = FALSE;
  if (flags & G_APP_INFO_CREATE_SUPPORTS_URIS)
    info->exec = g_strconcat (commandline, " %u", NULL);
  else
    info->exec = g_strconcat (commandline, " %f", NULL);
  info->comment = g_strdup_printf (_("Custom definition for %s"), info->name);
  info->nodisplay = TRUE;
  info->binary = binary_from_exec (info->exec);
  
  if (application_name)
    info->name = g_strdup (application_name);
  else
    {
      /* FIXME: this should be more robust. Maybe g_shell_parse_argv and use argv[0] */
      split = g_strsplit (commandline, " ", 2);
      basename = g_path_get_basename (split[0]);
      g_strfreev (split);
      info->name = basename;
      if (info->name == NULL)
	info->name = g_strdup ("custom");
    }
  
  return G_APP_INFO (info);
}

static void
g_desktop_app_info_iface_init (GAppInfoIface *iface)
{
  iface->dup = g_desktop_app_info_dup;
  iface->equal = g_desktop_app_info_equal;
  iface->get_id = g_desktop_app_info_get_id;
  iface->get_name = g_desktop_app_info_get_name;
  iface->get_description = g_desktop_app_info_get_description;
  iface->get_executable = g_desktop_app_info_get_executable;
  iface->get_icon = g_desktop_app_info_get_icon;
  iface->launch = g_desktop_app_info_launch;
  iface->supports_uris = g_desktop_app_info_supports_uris;
  iface->supports_files = g_desktop_app_info_supports_files;
  iface->launch_uris = g_desktop_app_info_launch_uris;
  iface->should_show = g_desktop_app_info_should_show;
  iface->set_as_default_for_type = g_desktop_app_info_set_as_default_for_type;
  iface->set_as_default_for_extension = g_desktop_app_info_set_as_default_for_extension;
  iface->add_supports_type = g_desktop_app_info_add_supports_type;
  iface->can_remove_supports_type = g_desktop_app_info_can_remove_supports_type;
  iface->remove_supports_type = g_desktop_app_info_remove_supports_type;
}

static gboolean
app_info_in_list (GAppInfo *info, 
                  GList    *list)
{
  while (list != NULL)
    {
      if (g_app_info_equal (info, list->data))
	return TRUE;
      list = list->next;
    }
  return FALSE;
}


/**
 * g_app_info_get_all_for_type:
 * @content_type: the content type to find a #GAppInfo for
 * 
 * Gets a list of all #GAppInfo s for a given content type.
 *
 * Returns: #GList of #GAppInfo s for given @content_type
 *    or %NULL on error.
 **/
GList *
g_app_info_get_all_for_type (const char *content_type)
{
  GList *desktop_entries, *l;
  GList *infos;
  GDesktopAppInfo *info;

  g_return_val_if_fail (content_type != NULL, NULL);
  
  desktop_entries = get_all_desktop_entries_for_mime_type (content_type);

  infos = NULL;
  for (l = desktop_entries; l != NULL; l = l->next)
    {
      char *desktop_entry = l->data;

      info = g_desktop_app_info_new (desktop_entry);
      if (info)
	{
	  if (app_info_in_list (G_APP_INFO (info), infos))
	    g_object_unref (info);
	  else
	    infos = g_list_prepend (infos, info);
	}
      g_free (desktop_entry);
    }

  g_list_free (desktop_entries);
  
  return g_list_reverse (infos);
}


/**
 * g_app_info_get_default_for_type:
 * @content_type: the content type to find a #GAppInfo for
 * @must_support_uris: if %TRUE, the #GAppInfo is expected to
 *     support URIs
 * 
 * Gets the #GAppInfo that correspond to a given content type.
 *
 * Returns: #GAppInfo for given @content_type or %NULL on error.
 **/
GAppInfo *
g_app_info_get_default_for_type (const char *content_type,
				 gboolean    must_support_uris)
{
  GList *desktop_entries, *l;
  GAppInfo *info;

  g_return_val_if_fail (content_type != NULL, NULL);
  
  desktop_entries = get_all_desktop_entries_for_mime_type (content_type);

  info = NULL;
  for (l = desktop_entries; l != NULL; l = l->next)
    {
      char *desktop_entry = l->data;

      info = (GAppInfo *)g_desktop_app_info_new (desktop_entry);
      if (info)
	{
	  if (must_support_uris && !g_app_info_supports_uris (info))
	    {
	      g_object_unref (info);
	      info = NULL;
	    }
	  else
	    break;
	}
    }
  
  g_list_foreach  (desktop_entries, (GFunc)g_free, NULL);
  g_list_free (desktop_entries);
  
  return info;
}

/**
 * g_app_info_get_default_for_uri_scheme:
 * @uri_scheme: a string containing a URI scheme.
 *
 * Gets the default application for launching applications 
 * using this URI scheme. A URI scheme is the initial part 
 * of the URI, up to but not including the ':', e.g. "http", 
 * "ftp" or "sip".
 * 
 * Returns: #GAppInfo for given @uri_scheme or %NULL on error.
 **/
GAppInfo *
g_app_info_get_default_for_uri_scheme (const char *uri_scheme)
{
  static gsize lookup = 0;
  
  if (g_once_init_enter (&lookup))
    {
      gsize setup_value = 1;
      GDesktopAppInfoLookup *lookup_instance;
      const char *use_this;
      GIOExtensionPoint *ep;
      GIOExtension *extension;
      GList *l;

      use_this = g_getenv ("GIO_USE_URI_ASSOCIATION");
      
      /* Ensure vfs in modules loaded */
      _g_io_modules_ensure_loaded ();
      
      ep = g_io_extension_point_lookup (G_DESKTOP_APP_INFO_LOOKUP_EXTENSION_POINT_NAME);

      lookup_instance = NULL;
      if (use_this)
	{
	  extension = g_io_extension_point_get_extension_by_name (ep, use_this);
	  if (extension)
	    lookup_instance = g_object_new (g_io_extension_get_type (extension), NULL);
	}
      
      if (lookup_instance == NULL)
	{
	  for (l = g_io_extension_point_get_extensions (ep); l != NULL; l = l->next)
	    {
	      extension = l->data;
	      lookup_instance = g_object_new (g_io_extension_get_type (extension), NULL);
	      if (lookup_instance != NULL)
		break;
	    }
	}

      if (lookup_instance != NULL)
	setup_value = (gsize)lookup_instance;
      
      g_once_init_leave (&lookup, setup_value);
    }

  if (lookup == 1)
    return NULL;

  return g_desktop_app_info_lookup_get_default_for_uri_scheme (G_DESKTOP_APP_INFO_LOOKUP (lookup),
							       uri_scheme);
}


static void
get_apps_from_dir (GHashTable *apps, 
                   const char *dirname, 
                   const char *prefix)
{
  GDir *dir;
  const char *basename;
  char *filename, *subprefix, *desktop_id;
  gboolean hidden;
  GDesktopAppInfo *appinfo;
  
  dir = g_dir_open (dirname, 0, NULL);
  if (dir)
    {
      while ((basename = g_dir_read_name (dir)) != NULL)
	{
	  filename = g_build_filename (dirname, basename, NULL);
	  if (g_str_has_suffix (basename, ".desktop"))
	    {
	      desktop_id = g_strconcat (prefix, basename, NULL);

	      /* Use _extended so we catch NULLs too (hidden) */
	      if (!g_hash_table_lookup_extended (apps, desktop_id, NULL, NULL))
		{
		  appinfo = g_desktop_app_info_new_from_filename (filename);

		  if (appinfo && g_desktop_app_info_get_is_hidden (appinfo))
		    {
		      g_object_unref (appinfo);
		      appinfo = NULL;
		      hidden = TRUE;
		    }
				      
		  if (appinfo || hidden)
		    {
		      g_hash_table_insert (apps, g_strdup (desktop_id), appinfo);

		      if (appinfo)
			{
			  /* Reuse instead of strdup here */
			  appinfo->desktop_id = desktop_id;
			  desktop_id = NULL;
			}
		    }
		}
	      g_free (desktop_id);
	    }
	  else
	    {
	      if (g_file_test (filename, G_FILE_TEST_IS_DIR))
		{
		  subprefix = g_strconcat (prefix, basename, "-", NULL);
		  get_apps_from_dir (apps, filename, subprefix);
		  g_free (subprefix);
		}
	    }
	  g_free (filename);
	}
      g_dir_close (dir);
    }
}


/**
 * g_app_info_get_all:
 *
 * Gets a list of all of the applications currently registered 
 * on this system.
 * 
 * For desktop files, this includes applications that have 
 * <literal>NoDisplay=true</literal> set or are excluded from 
 * display by means of <literal>OnlyShowIn</literal> or
 * <literal>NotShowIn</literal>. See g_app_info_should_show().
 * The returned list does not include applications which have
 * the <literal>Hidden</literal> key set. 
 * 
 * Returns: a newly allocated #GList of references to #GAppInfo<!---->s.
 **/
GList *
g_app_info_get_all (void)
{
  const char * const *dirs;
  GHashTable *apps;
  GHashTableIter iter;
  gpointer value;
  int i;
  GList *infos;

  dirs = get_applications_search_path ();

  apps = g_hash_table_new_full (g_str_hash, g_str_equal,
				g_free, NULL);

  
  for (i = 0; dirs[i] != NULL; i++)
    get_apps_from_dir (apps, dirs[i], "");


  infos = NULL;
  g_hash_table_iter_init (&iter, apps);
  while (g_hash_table_iter_next (&iter, NULL, &value))
    {
      if (value)
        infos = g_list_prepend (infos, value);
    }

  g_hash_table_destroy (apps);

  return g_list_reverse (infos);
}

/* Cacheing of mimeinfo.cache and defaults.list files */

typedef struct {
  char *path;
  GHashTable *mime_info_cache_map;
  GHashTable *defaults_list_map;
  GHashTable *mimeapps_list_added_map;
  GHashTable *mimeapps_list_removed_map;
  time_t mime_info_cache_timestamp;
  time_t defaults_list_timestamp;
  time_t mimeapps_list_timestamp;
} MimeInfoCacheDir;

typedef struct {
  GList *dirs;                       /* mimeinfo.cache and defaults.list */
  GHashTable *global_defaults_cache; /* global results of defaults.list lookup and validation */
  time_t last_stat_time;
  guint should_ping_mime_monitor : 1;
} MimeInfoCache;

static MimeInfoCache *mime_info_cache = NULL;
G_LOCK_DEFINE_STATIC (mime_info_cache);

static void mime_info_cache_dir_add_desktop_entries (MimeInfoCacheDir  *dir,
						     const char        *mime_type,
						     char             **new_desktop_file_ids);

static MimeInfoCache * mime_info_cache_new (void);

static void
destroy_info_cache_value (gpointer  key, 
                          GList    *value, 
                          gpointer  data)
{
  g_list_foreach (value, (GFunc)g_free, NULL);
  g_list_free (value);
}

static void
destroy_info_cache_map (GHashTable *info_cache_map)
{
  g_hash_table_foreach (info_cache_map, (GHFunc)destroy_info_cache_value, NULL);
  g_hash_table_destroy (info_cache_map);
}

static gboolean
mime_info_cache_dir_out_of_date (MimeInfoCacheDir *dir,
				 const char       *cache_file,
				 time_t           *timestamp)
{
  struct stat buf;
  char *filename;
  
  filename = g_build_filename (dir->path, cache_file, NULL);
  
  if (g_stat (filename, &buf) < 0)
    {
      g_free (filename);
      return TRUE;
    }
  g_free (filename);

  if (buf.st_mtime != *timestamp) 
    return TRUE;
  
  return FALSE;
}

/* Call with lock held */
static gboolean
remove_all (gpointer  key,
	    gpointer  value,
	    gpointer  user_data)
{
  return TRUE;
}


static void
mime_info_cache_blow_global_cache (void)
{
  g_hash_table_foreach_remove (mime_info_cache->global_defaults_cache,
			       remove_all, NULL);
}

static void
mime_info_cache_dir_init (MimeInfoCacheDir *dir)
{
  GError *load_error;
  GKeyFile *key_file;
  gchar *filename, **mime_types;
  int i;
  struct stat buf;
  
  load_error = NULL;
  mime_types = NULL;
  
  if (dir->mime_info_cache_map != NULL &&
      !mime_info_cache_dir_out_of_date (dir, "mimeinfo.cache",
					&dir->mime_info_cache_timestamp))
    return;
  
  if (dir->mime_info_cache_map != NULL)
    destroy_info_cache_map (dir->mime_info_cache_map);
  
  dir->mime_info_cache_map = g_hash_table_new_full (g_str_hash, g_str_equal,
						    (GDestroyNotify) g_free,
						    NULL);
  
  key_file = g_key_file_new ();
  
  filename = g_build_filename (dir->path, "mimeinfo.cache", NULL);
  
  if (g_stat (filename, &buf) < 0)
    goto error;
  
  if (dir->mime_info_cache_timestamp > 0) 
    mime_info_cache->should_ping_mime_monitor = TRUE;
  
  dir->mime_info_cache_timestamp = buf.st_mtime;
  
  g_key_file_load_from_file (key_file, filename, G_KEY_FILE_NONE, &load_error);
  
  g_free (filename);
  filename = NULL;
  
  if (load_error != NULL)
    goto error;
  
  mime_types = g_key_file_get_keys (key_file, MIME_CACHE_GROUP,
				    NULL, &load_error);
  
  if (load_error != NULL)
    goto error;
  
  for (i = 0; mime_types[i] != NULL; i++)
    {
      gchar **desktop_file_ids;
      char *unaliased_type;
      desktop_file_ids = g_key_file_get_string_list (key_file,
						     MIME_CACHE_GROUP,
						     mime_types[i],
						     NULL,
						     NULL);
      
      if (desktop_file_ids == NULL)
	continue;

      unaliased_type = _g_unix_content_type_unalias (mime_types[i]);
      mime_info_cache_dir_add_desktop_entries (dir,
					       unaliased_type,
					       desktop_file_ids);
      g_free (unaliased_type);
    
      g_strfreev (desktop_file_ids);
    }
  
  g_strfreev (mime_types);
  g_key_file_free (key_file);
  
  return;
 error:
  g_free (filename);
  g_key_file_free (key_file);
  
  if (mime_types != NULL)
    g_strfreev (mime_types);
  
  if (load_error)
    g_error_free (load_error);
}

static void
mime_info_cache_dir_init_defaults_list (MimeInfoCacheDir *dir)
{
  GKeyFile *key_file;
  GError *load_error;
  gchar *filename, **mime_types;
  char *unaliased_type;
  char **desktop_file_ids;
  int i;
  struct stat buf;

  load_error = NULL;
  mime_types = NULL;

  if (dir->defaults_list_map != NULL &&
      !mime_info_cache_dir_out_of_date (dir, "defaults.list",
					&dir->defaults_list_timestamp))
    return;
  
  if (dir->defaults_list_map != NULL)
    g_hash_table_destroy (dir->defaults_list_map);
  dir->defaults_list_map = g_hash_table_new_full (g_str_hash, g_str_equal,
						  g_free, (GDestroyNotify)g_strfreev);
  

  key_file = g_key_file_new ();
  
  filename = g_build_filename (dir->path, "defaults.list", NULL);
  if (g_stat (filename, &buf) < 0)
    goto error;

  if (dir->defaults_list_timestamp > 0) 
    mime_info_cache->should_ping_mime_monitor = TRUE;

  dir->defaults_list_timestamp = buf.st_mtime;

  g_key_file_load_from_file (key_file, filename, G_KEY_FILE_NONE, &load_error);
  g_free (filename);
  filename = NULL;

  if (load_error != NULL)
    goto error;

  mime_types = g_key_file_get_keys (key_file, DEFAULT_APPLICATIONS_GROUP,
				    NULL, NULL);
  if (mime_types != NULL)
    {
      for (i = 0; mime_types[i] != NULL; i++)
	{
	  desktop_file_ids = g_key_file_get_string_list (key_file,
							 DEFAULT_APPLICATIONS_GROUP,
							 mime_types[i],
							 NULL,
							 NULL);
	  if (desktop_file_ids == NULL)
	    continue;
	  
	  unaliased_type = _g_unix_content_type_unalias (mime_types[i]);
	  g_hash_table_replace (dir->defaults_list_map,
				unaliased_type,
				desktop_file_ids);
	}
      
      g_strfreev (mime_types);
    }

  g_key_file_free (key_file);
  return;
  
 error:
  g_free (filename);
  g_key_file_free (key_file);
  
  if (mime_types != NULL)
    g_strfreev (mime_types);
  
  if (load_error)
    g_error_free (load_error);
}

static void
mime_info_cache_dir_init_mimeapps_list (MimeInfoCacheDir *dir)
{
  GKeyFile *key_file;
  GError *load_error;
  gchar *filename, **mime_types;
  char *unaliased_type;
  char **desktop_file_ids;
  int i;
  struct stat buf;

  load_error = NULL;
  mime_types = NULL;

  if (dir->mimeapps_list_added_map != NULL &&
      !mime_info_cache_dir_out_of_date (dir, "mimeapps.list",
					&dir->mimeapps_list_timestamp))
    return;
  
  if (dir->mimeapps_list_added_map != NULL)
    g_hash_table_destroy (dir->mimeapps_list_added_map);
  dir->mimeapps_list_added_map = g_hash_table_new_full (g_str_hash, g_str_equal,
							g_free, (GDestroyNotify)g_strfreev);
  
  if (dir->mimeapps_list_removed_map != NULL)
    g_hash_table_destroy (dir->mimeapps_list_removed_map);
  dir->mimeapps_list_removed_map = g_hash_table_new_full (g_str_hash, g_str_equal,
							  g_free, (GDestroyNotify)g_strfreev);

  key_file = g_key_file_new ();
  
  filename = g_build_filename (dir->path, "mimeapps.list", NULL);
  if (g_stat (filename, &buf) < 0)
    goto error;

  if (dir->mimeapps_list_timestamp > 0) 
    mime_info_cache->should_ping_mime_monitor = TRUE;

  dir->mimeapps_list_timestamp = buf.st_mtime;

  g_key_file_load_from_file (key_file, filename, G_KEY_FILE_NONE, &load_error);
  g_free (filename);
  filename = NULL;

  if (load_error != NULL)
    goto error;

  mime_types = g_key_file_get_keys (key_file, ADDED_ASSOCIATIONS_GROUP,
				    NULL, NULL);
  if (mime_types != NULL)
    {
      for (i = 0; mime_types[i] != NULL; i++)
	{
	  desktop_file_ids = g_key_file_get_string_list (key_file,
							 ADDED_ASSOCIATIONS_GROUP,
							 mime_types[i],
							 NULL,
							 NULL);
	  if (desktop_file_ids == NULL)
	    continue;
	  
	  unaliased_type = _g_unix_content_type_unalias (mime_types[i]);
	  g_hash_table_replace (dir->mimeapps_list_added_map,
				unaliased_type,
				desktop_file_ids);
	}
      
      g_strfreev (mime_types);
    }

  mime_types = g_key_file_get_keys (key_file, REMOVED_ASSOCIATIONS_GROUP,
				    NULL, NULL);
  if (mime_types != NULL)
    {
      for (i = 0; mime_types[i] != NULL; i++)
	{
	  desktop_file_ids = g_key_file_get_string_list (key_file,
							 REMOVED_ASSOCIATIONS_GROUP,
							 mime_types[i],
							 NULL,
							 NULL);
	  if (desktop_file_ids == NULL)
	    continue;
	  
	  unaliased_type = _g_unix_content_type_unalias (mime_types[i]);
	  g_hash_table_replace (dir->mimeapps_list_removed_map,
				unaliased_type,
				desktop_file_ids);
	}
      
      g_strfreev (mime_types);
    }

  g_key_file_free (key_file);
  return;
  
 error:
  g_free (filename);
  g_key_file_free (key_file);
  
  if (mime_types != NULL)
    g_strfreev (mime_types);
  
  if (load_error)
    g_error_free (load_error);
}

static MimeInfoCacheDir *
mime_info_cache_dir_new (const char *path)
{
  MimeInfoCacheDir *dir;

  dir = g_new0 (MimeInfoCacheDir, 1);
  dir->path = g_strdup (path);
  
  return dir;
}

static void
mime_info_cache_dir_free (MimeInfoCacheDir *dir)
{
  if (dir == NULL)
    return;
  
  if (dir->mime_info_cache_map != NULL)
    {
      destroy_info_cache_map (dir->mime_info_cache_map);
      dir->mime_info_cache_map = NULL;
      
  }
  
  if (dir->defaults_list_map != NULL)
    {
      g_hash_table_destroy (dir->defaults_list_map);
      dir->defaults_list_map = NULL;
    }
  
  if (dir->mimeapps_list_added_map != NULL)
    {
      g_hash_table_destroy (dir->mimeapps_list_added_map);
      dir->mimeapps_list_added_map = NULL;
    }
  
  if (dir->mimeapps_list_removed_map != NULL)
    {
      g_hash_table_destroy (dir->mimeapps_list_removed_map);
      dir->mimeapps_list_removed_map = NULL;
    }
  
  g_free (dir);
}

static void
mime_info_cache_dir_add_desktop_entries (MimeInfoCacheDir  *dir,
					 const char        *mime_type,
					 char             **new_desktop_file_ids)
{
  GList *desktop_file_ids;
  int i;
  
  desktop_file_ids = g_hash_table_lookup (dir->mime_info_cache_map,
					  mime_type);
  
  for (i = 0; new_desktop_file_ids[i] != NULL; i++)
    {
      if (!g_list_find (desktop_file_ids, new_desktop_file_ids[i]))
	desktop_file_ids = g_list_append (desktop_file_ids,
					  g_strdup (new_desktop_file_ids[i]));
    }
  
  g_hash_table_insert (dir->mime_info_cache_map, g_strdup (mime_type), desktop_file_ids);
}

static void
mime_info_cache_init_dir_lists (void)
{
  const char * const *dirs;
  int i;
  
  mime_info_cache = mime_info_cache_new ();
  
  dirs = get_applications_search_path ();
  
  for (i = 0; dirs[i] != NULL; i++)
    {
      MimeInfoCacheDir *dir;
      
      dir = mime_info_cache_dir_new (dirs[i]);
      
      if (dir != NULL)
	{
	  mime_info_cache_dir_init (dir);
	  mime_info_cache_dir_init_defaults_list (dir);
	  mime_info_cache_dir_init_mimeapps_list (dir);
	  
	  mime_info_cache->dirs = g_list_append (mime_info_cache->dirs, dir);
	}
    }
}

static void
mime_info_cache_update_dir_lists (void)
{
  GList *tmp;
  
  tmp = mime_info_cache->dirs;
  
  while (tmp != NULL)
    {
      MimeInfoCacheDir *dir = (MimeInfoCacheDir *) tmp->data;

      /* No need to do this if we had file monitors... */
      mime_info_cache_blow_global_cache ();
      mime_info_cache_dir_init (dir);
      mime_info_cache_dir_init_defaults_list (dir);
      mime_info_cache_dir_init_mimeapps_list (dir);
      
      tmp = tmp->next;
    }
}

static void
mime_info_cache_init (void)
{
  G_LOCK (mime_info_cache);
  if (mime_info_cache == NULL)
    mime_info_cache_init_dir_lists ();
  else
    {
      time_t now;
      
      time (&now);
      if (now >= mime_info_cache->last_stat_time + 10)
	{
	  mime_info_cache_update_dir_lists ();
	  mime_info_cache->last_stat_time = now;
	}
    }
  
  if (mime_info_cache->should_ping_mime_monitor)
    {
      /* g_idle_add (emit_mime_changed, NULL); */
      mime_info_cache->should_ping_mime_monitor = FALSE;
    }
  
  G_UNLOCK (mime_info_cache);
}

static MimeInfoCache *
mime_info_cache_new (void)
{
  MimeInfoCache *cache;
  
  cache = g_new0 (MimeInfoCache, 1);
  
  cache->global_defaults_cache = g_hash_table_new_full (g_str_hash, g_str_equal,
							(GDestroyNotify) g_free,
							(GDestroyNotify) g_free);
  return cache;
}

static void
mime_info_cache_free (MimeInfoCache *cache)
{
  if (cache == NULL)
    return;
  
  g_list_foreach (cache->dirs,
		  (GFunc) mime_info_cache_dir_free,
		  NULL);
  g_list_free (cache->dirs);
  g_hash_table_destroy (cache->global_defaults_cache);
  g_free (cache);
}

/**
 * mime_info_cache_reload:
 * @dir: directory path which needs reloading.
 * 
 * Reload the mime information for the @dir.
 */
static void
mime_info_cache_reload (const char *dir)
{
  /* FIXME: just reload the dir that needs reloading,
   * don't blow the whole cache
   */
  if (mime_info_cache != NULL)
    {
      G_LOCK (mime_info_cache);
      mime_info_cache_free (mime_info_cache);
      mime_info_cache = NULL;
      G_UNLOCK (mime_info_cache);
    }
}

static GList *
append_desktop_entry (GList      *list, 
                      const char *desktop_entry,
		      GList      *removed_entries)
{
  /* Add if not already in list, and valid */
  if (!g_list_find_custom (list, desktop_entry, (GCompareFunc) strcmp) &&
      !g_list_find_custom (removed_entries, desktop_entry, (GCompareFunc) strcmp))
    list = g_list_prepend (list, g_strdup (desktop_entry));
  
  return list;
}

/**
 * get_all_desktop_entries_for_mime_type:
 * @mime_type: a mime type.
 *
 * Returns all the desktop ids for @mime_type. The desktop files
 * are listed in an order so that default applications are listed before
 * non-default ones, and handlers for inherited mimetypes are listed
 * after the base ones.
 *
 * Return value: a #GList containing the desktop ids which claim
 *    to handle @mime_type.
 */
static GList *
get_all_desktop_entries_for_mime_type (const char *base_mime_type)
{
  GList *desktop_entries, *removed_entries, *list, *dir_list, *tmp;
  MimeInfoCacheDir *dir;
  char *mime_type;
  char **mime_types;
  char **default_entries;
  char **removed_associations;
  int i,j;
  
  mime_info_cache_init ();

  mime_types = _g_unix_content_type_get_parents (base_mime_type);
  G_LOCK (mime_info_cache);
  
  removed_entries = NULL;
  desktop_entries = NULL;
  for (i = 0; mime_types[i] != NULL; i++)
    {
      mime_type = mime_types[i];

      /* Go through all apps listed as defaults */
      for (dir_list = mime_info_cache->dirs;
	   dir_list != NULL;
	   dir_list = dir_list->next)
	{
	  dir = dir_list->data;

	  /* First added associations from mimeapps.list */
	  default_entries = g_hash_table_lookup (dir->mimeapps_list_added_map, mime_type);
	  for (j = 0; default_entries != NULL && default_entries[j] != NULL; j++)
	    desktop_entries = append_desktop_entry (desktop_entries, default_entries[j], removed_entries);

	  /* Then removed assiciations from mimeapps.list */
	  removed_associations = g_hash_table_lookup (dir->mimeapps_list_removed_map, mime_type);
	  for (j = 0; removed_associations != NULL && removed_associations[j] != NULL; j++)
	    removed_entries = append_desktop_entry (removed_entries, removed_associations[j], NULL);

	  /* Then system defaults (or old per-user config) (using removed associations from this dir or earlier) */
	  default_entries = g_hash_table_lookup (dir->defaults_list_map, mime_type);
	  for (j = 0; default_entries != NULL && default_entries[j] != NULL; j++)
	    desktop_entries = append_desktop_entry (desktop_entries, default_entries[j], removed_entries);
	}

      /* Go through all entries that support the mimetype */
      for (dir_list = mime_info_cache->dirs;
	   dir_list != NULL;
	   dir_list = dir_list->next) 
        {
	  dir = dir_list->data;
	
	  list = g_hash_table_lookup (dir->mime_info_cache_map, mime_type);
	  for (tmp = list; tmp != NULL; tmp = tmp->next)
	    desktop_entries = append_desktop_entry (desktop_entries, tmp->data, removed_entries);
        }
    }
  
  G_UNLOCK (mime_info_cache);

  g_strfreev (mime_types);

  g_list_free (removed_entries);
  
  desktop_entries = g_list_reverse (desktop_entries);
  
  return desktop_entries;
}

/* GDesktopAppInfoLookup interface: */

static void g_desktop_app_info_lookup_base_init (gpointer g_class);
static void g_desktop_app_info_lookup_class_init (gpointer g_class,
						  gpointer class_data);

GType
g_desktop_app_info_lookup_get_type (void)
{
  static GType desktop_app_info_lookup_type = 0;

  if (! desktop_app_info_lookup_type)
    {
      static const GTypeInfo desktop_app_info_lookup_info =
      {
        sizeof (GDesktopAppInfoLookupIface), /* class_size */
	g_desktop_app_info_lookup_base_init,   /* base_init */
	NULL,		/* base_finalize */
	g_desktop_app_info_lookup_class_init,
	NULL,		/* class_finalize */
	NULL,		/* class_data */
	0,
	0,              /* n_preallocs */
	NULL
      };

      desktop_app_info_lookup_type =
	g_type_register_static (G_TYPE_INTERFACE, I_("GDesktopAppInfoLookup"),
				&desktop_app_info_lookup_info, 0);

      g_type_interface_add_prerequisite (desktop_app_info_lookup_type, G_TYPE_OBJECT);
    }

  return desktop_app_info_lookup_type;
}

static void
g_desktop_app_info_lookup_class_init (gpointer g_class,
				      gpointer class_data)
{
}

static void
g_desktop_app_info_lookup_base_init (gpointer g_class)
{
}

/**
 * g_desktop_app_info_lookup_get_default_for_uri_scheme:
 * @lookup: a #GDesktopAppInfoLookup
 * @uri_scheme: a string containing a URI scheme.
 *
 * Gets the default application for launching applications 
 * using this URI scheme for a particular GDesktopAppInfoLookup
 * implementation.
 *
 * The GDesktopAppInfoLookup interface and this function is used
 * to implement g_app_info_get_default_for_uri_scheme() backends
 * in a GIO module. There is no reason for applications to use it
 * directly. Applications should use g_app_info_get_default_for_uri_scheme().
 * 
 * Returns: #GAppInfo for given @uri_scheme or %NULL on error.
 */
GAppInfo *
g_desktop_app_info_lookup_get_default_for_uri_scheme (GDesktopAppInfoLookup *lookup,
						      const char            *uri_scheme)
{
  GDesktopAppInfoLookupIface *iface;
  
  g_return_val_if_fail (G_IS_DESKTOP_APP_INFO_LOOKUP (lookup), FALSE);

  iface = G_DESKTOP_APP_INFO_LOOKUP_GET_IFACE (lookup);

  return (* iface->get_default_for_uri_scheme) (lookup, uri_scheme);
}

#define __G_DESKTOP_APP_INFO_C__
#include "gioaliasdef.c"