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nautilus-link.c

/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*-

   nautilus-link.c: .desktop link files.
 
   Copyright (C) 2001 Red Hat, Inc.
  
   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.
  
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the historicalied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.
  
   You should have received a copy of the GNU General Public
   License along with this program; if not, write to the
   Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.
  
   Authors: Jonathan Blandford <jrb@redhat.com>
            Alexander Larsson <alexl@redhat.com>
*/

#include <config.h>
#include "nautilus-link.h"

#include "nautilus-directory-notify.h"
#include "nautilus-directory.h"
#include "nautilus-file-utilities.h"
#include "nautilus-file.h"
#include "nautilus-program-choosing.h"
#include "nautilus-icon-names.h"
#include <eel/eel-vfs-extensions.h>
#include <glib/gi18n.h>
#include <gio/gio.h>
#include <stdlib.h>
#include <string.h>

#define MAIN_GROUP "Desktop Entry"

#define NAUTILUS_LINK_GENERIC_TAG   "Link"
#define NAUTILUS_LINK_TRASH_TAG     "X-nautilus-trash"
#define NAUTILUS_LINK_MOUNT_TAG     "FSDevice"
#define NAUTILUS_LINK_HOME_TAG            "X-nautilus-home"

static gboolean
is_link_mime_type (const char *mime_type)
{
      if (mime_type != NULL &&
          (g_ascii_strcasecmp (mime_type, "application/x-gnome-app-info") == 0 ||
           g_ascii_strcasecmp (mime_type, "application/x-desktop") == 0)) {
            return TRUE;
      }

      return FALSE;
}

static gboolean
is_local_file_a_link (const char *uri)
{
      gboolean link;
      GFile *file;
      GFileInfo *info;
      GError *error;

      error = NULL;
      link = FALSE;

      file = g_file_new_for_uri (uri);

      info = g_file_query_info (file,
                          G_FILE_ATTRIBUTE_STANDARD_CONTENT_TYPE,
                          0, NULL, &error);
      if (info) {
            link = is_link_mime_type (g_file_info_get_content_type (info));
            g_object_unref (info);
      }
      else {
            g_warning ("Error getting info: %s\n", error->message);
            g_error_free (error);
      }

      g_object_unref (file);

      return link;
}

static gboolean
_g_key_file_load_from_gfile (GKeyFile *key_file,
                       GFile *file,
                       GKeyFileFlags flags,
                       GError **error)
{
      char *data;
      gsize len;
      gboolean res;
      
      if (!g_file_load_contents (file, NULL, &data, &len, NULL, error)) {
            return FALSE;
      }

      res = g_key_file_load_from_data (key_file, data, len, flags, error);
      
      g_free (data);
      
      return res;
}

static gboolean
_g_key_file_save_to_gfile (GKeyFile *key_file,
                     GFile *file,
                     GError  **error)
{
      char *data;
      gsize len;

      data = g_key_file_to_data (key_file, &len, error);
      if (data == NULL) {
            return FALSE;
      }
            
      if (!g_file_replace_contents (file,
                              data, len,
                              NULL, FALSE,
                              G_FILE_CREATE_NONE,
                              NULL, NULL, error)) {
            g_free (data);
            return FALSE;
      }
      g_free (data);
      return TRUE;
}



static GKeyFile *
_g_key_file_new_from_uri (const char *uri,
                    GKeyFileFlags flags,
                    GError **error)
{
      GKeyFile *key_file;
      GFile *file;
      
      file = g_file_new_for_uri (uri);
      key_file = g_key_file_new ();
      if (!_g_key_file_load_from_gfile (key_file, file, flags, error)) {
            g_key_file_free (key_file);
            key_file = NULL;
      }
      g_object_unref (file);
      return key_file;
}

static char *
slurp_key_string (const char *uri,
              const char *keyname,
                  gboolean    localize)
{
      GKeyFile *key_file;
      char *result;

      key_file = _g_key_file_new_from_uri (uri, G_KEY_FILE_NONE, NULL);
      if (key_file == NULL) {
            return NULL;
      }

      if (localize) {
            result = g_key_file_get_locale_string (key_file, MAIN_GROUP, keyname, NULL, NULL);        
      } else {
            result = g_key_file_get_string (key_file, MAIN_GROUP, keyname, NULL);         
      }
      g_key_file_free (key_file);

      return result;
}

gboolean
nautilus_link_local_create (const char     *directory_uri,
                      const char     *base_name,
                      const char     *display_name,
                      const char     *image,
                      const char     *target_uri,
                      const GdkPoint *point,
                      int             screen,
                      gboolean        unique_filename)
{
      char *real_directory_uri;
      char *uri, *contents;
      GFile *file;
      GList dummy_list;
      NautilusFileChangesQueuePosition item;

      g_return_val_if_fail (directory_uri != NULL, FALSE);
      g_return_val_if_fail (base_name != NULL, FALSE);
      g_return_val_if_fail (display_name != NULL, FALSE);
      g_return_val_if_fail (target_uri != NULL, FALSE);

      if (eel_uri_is_trash (directory_uri) ||
          eel_uri_is_search (directory_uri)) {
            return FALSE;
      }

      if (eel_uri_is_desktop (directory_uri)) {
            real_directory_uri = nautilus_get_desktop_directory_uri ();
      } else {
            real_directory_uri = g_strdup (directory_uri);
      }

      if (unique_filename) {
            uri = nautilus_ensure_unique_file_name (real_directory_uri,
                                          base_name, ".desktop");
            if (uri == NULL) {
                  g_free (real_directory_uri);
                  return FALSE;
            }
            file = g_file_new_for_uri (uri);
            g_free (uri);
      } else {
            char *link_name;
            GFile *dir;

            link_name = g_strdup_printf ("%s.desktop", base_name);

            /* replace '/' with '-', just in case */
            g_strdelimit (link_name, "/", '-');

            dir = g_file_new_for_uri (directory_uri);
            file = g_file_get_child (dir, link_name);

            g_free (link_name);
            g_object_unref (dir);
      }

      g_free (real_directory_uri);

      contents = g_strdup_printf ("[Desktop Entry]\n"
                            "Encoding=UTF-8\n"
                            "Name=%s\n"
                            "Type=Link\n"
                            "URL=%s\n"
                            "%s%s\n",
                            display_name,
                            target_uri,
                            image != NULL ? "Icon=" : "",
                            image != NULL ? image : "");


      if (!g_file_replace_contents (file,
                              contents, strlen (contents),
                              NULL, FALSE,
                              G_FILE_CREATE_NONE,
                              NULL, NULL, NULL)) {
            g_free (contents);
            g_object_unref (file);
            return FALSE;
      }
      g_free (contents);

      dummy_list.data = file;
      dummy_list.next = NULL;
      dummy_list.prev = NULL;
      nautilus_directory_notify_files_added (&dummy_list);

      if (point != NULL) {
            item.location = file;
            item.set = TRUE;
            item.point.x = point->x;
            item.point.y = point->y;
            item.screen = screen;
            dummy_list.data = &item;
            dummy_list.next = NULL;
            dummy_list.prev = NULL;
      
            nautilus_directory_schedule_position_set (&dummy_list);
      }

      g_object_unref (file);
      return TRUE;
}

static const char *
get_language (void)
{
      const char * const *langs_pointer;
      int i;

      langs_pointer = g_get_language_names ();
      for (i = 0; langs_pointer[i] != NULL; i++) {
            /* find first without encoding */
            if (strchr (langs_pointer[i], '.') == NULL) {
            return langs_pointer[i];
            }
      }
      return NULL;
} 

static gboolean
nautilus_link_local_set_key (const char *uri,
                       const char *key,
                       const char *value,
                       gboolean    localize)
{
      gboolean success;
      GKeyFile *key_file;
      GFile *file;
      
      file = g_file_new_for_uri (uri);
      key_file = g_key_file_new ();
      if (!_g_key_file_load_from_gfile (key_file, file, G_KEY_FILE_KEEP_COMMENTS, NULL)) {
            g_key_file_free (key_file);
            g_object_unref (file);
            return FALSE;
      }
      if (localize) {
            g_key_file_set_locale_string (key_file,
                                    MAIN_GROUP,
                                    key,
                                    get_language (), 
                                    value);
      } else {
            g_key_file_set_string (key_file, MAIN_GROUP, key, value);
      }
      
      
      success = _g_key_file_save_to_gfile (key_file,  file, NULL);
      g_key_file_free (key_file);
      g_object_unref (file);
      return success;
}

gboolean
nautilus_link_local_set_text (const char *uri,
                        const char *text)
{
      return nautilus_link_local_set_key (uri, "Name", text, TRUE);
}


gboolean
nautilus_link_local_set_icon (const char        *uri,
                        const char        *icon)
{
      return nautilus_link_local_set_key (uri, "Icon", icon, FALSE);
}

char *
nautilus_link_local_get_text (const char *path)
{
      return slurp_key_string (path, "Name", TRUE);
}

char *
nautilus_link_local_get_additional_text (const char *path)
{
      /* The comment field of current .desktop files is often bad.
       * It just contains a copy of the name. This is probably because the
       * panel shows the comment field as a tooltip.
       */
      return NULL;
#ifdef THIS_IS_NOT_USED_RIGHT_NOW
      char *type;
      char *retval;

      if (!is_local_file_a_link (uri)) {
            return NULL;
      }

      type = slurp_key_string (path, "Type", FALSE);
      retval = NULL;
      if (type == NULL) {
            return NULL;
      }

      if (strcmp (type, "Application") == 0) {
            retval = slurp_key_string (path, "Comment", TRUE);
      }
      
      g_free (type);

      return retval;
#endif
}

static char *
nautilus_link_get_link_uri_from_desktop (GKeyFile *key_file, const char *desktop_file_uri)
{
      GFile *file, *parent;
      char *type;
      char *retval;
      char *scheme;

      retval = NULL;

      type = g_key_file_get_string (key_file, MAIN_GROUP, "Type", NULL);
      if (type == NULL) {
            return NULL;
      }

      if (strcmp (type, "URL") == 0) {
            /* Some old broken desktop files use this nonstandard feature, we need handle it though */
            retval = g_key_file_get_string (key_file, MAIN_GROUP, "Exec", NULL);
      } else if ((strcmp (type, NAUTILUS_LINK_GENERIC_TAG) == 0) ||
               (strcmp (type, NAUTILUS_LINK_MOUNT_TAG) == 0) ||
               (strcmp (type, NAUTILUS_LINK_TRASH_TAG) == 0) ||
               (strcmp (type, NAUTILUS_LINK_HOME_TAG) == 0)) {
            retval = g_key_file_get_string (key_file, MAIN_GROUP, "URL", NULL);
      }
      g_free (type);

      if (retval != NULL && desktop_file_uri != NULL) {
            /* Handle local file names.
             * Ideally, we'd be able to use
             * g_file_parse_name(), but it does not know how to resolve
             * relative file names, since the base directory is unknown.
             */
            scheme = g_uri_parse_scheme (retval);
            if (scheme == NULL) {
                  file = g_file_new_for_uri (desktop_file_uri);
                  parent = g_file_get_parent (file);
                  g_object_unref (file);

                  if (parent != NULL) {
                        file = g_file_resolve_relative_path (parent, retval);
                        g_free (retval);
                        retval = g_file_get_uri (file);
                        g_object_unref (file);
                        g_object_unref (parent);
                  }
            }
      }

      return retval;
}

static char *
nautilus_link_get_link_name_from_desktop (GKeyFile *key_file)
{
      return g_key_file_get_locale_string (key_file, MAIN_GROUP, "Name", NULL, NULL);
}

static char *
nautilus_link_get_link_icon_from_desktop (GKeyFile *key_file)
{
      char *icon_uri, *icon, *p, *type;

      icon_uri = g_key_file_get_string (key_file, MAIN_GROUP, "X-Nautilus-Icon", NULL);
      if (icon_uri != NULL) {
            return icon_uri;
      }

      icon = g_key_file_get_string (key_file, MAIN_GROUP, "Icon", NULL);
      if (icon != NULL) {
            if (!g_path_is_absolute (icon)) {
                  /* Strip out any extension on non-filename icons. Old desktop files may have this */
                  p = strchr (icon, '.');
                        /* Only strip known icon extensions */
                  if ((p != NULL) &&
                      ((g_ascii_strcasecmp (p, ".png") == 0)
                       || (g_ascii_strcasecmp (p, ".svn") == 0)
                       || (g_ascii_strcasecmp (p, ".jpg") == 0)
                       || (g_ascii_strcasecmp (p, ".xpm") == 0)
                       || (g_ascii_strcasecmp (p, ".bmp") == 0)
                       || (g_ascii_strcasecmp (p, ".jpeg") == 0))) {
                        *p = 0;
                  }
            }
            return icon;
      }

      type = g_key_file_get_string (key_file, MAIN_GROUP, "Type", NULL);
      if (g_strcmp0 (type, "Application") == 0) {
            icon = g_strdup ("gnome-fs-executable");
      } else if (g_strcmp0 (type, "Link") == 0) {
            icon = g_strdup ("gnome-dev-symlink");
      } else if (g_strcmp0 (type, "FSDevice") == 0) {
            icon = g_strdup ("gnome-dev-harddisk");
      } else if (g_strcmp0 (type, "Directory") == 0) {
            icon = g_strdup (NAUTILUS_ICON_FOLDER);
      } else if (g_strcmp0 (type, "Service") == 0 ||
               g_strcmp0 (type, "ServiceType") == 0) {
            icon = g_strdup ("gnome-fs-web");
      } else {
            icon = g_strdup ("gnome-fs-regular");
      }
      g_free (type);

      return icon;
}

char *
nautilus_link_local_get_link_uri (const char *uri)
{
      GKeyFile *key_file;
      char *retval;

      if (!is_local_file_a_link (uri)) {
            return NULL;
      }

      key_file = _g_key_file_new_from_uri (uri, G_KEY_FILE_NONE, NULL);
      if (key_file == NULL) {
            return NULL;
      }

      retval = nautilus_link_get_link_uri_from_desktop (key_file, uri);
      g_key_file_free (key_file);

      return retval;
}

static gboolean
string_array_contains (char **array,
                   const char *str)
{
      char **p;

      if (!array)
            return FALSE;

      for (p = array; *p; p++)
            if (g_ascii_strcasecmp (*p, str) == 0) {
                  return TRUE;
            }

      return FALSE;
}

void
nautilus_link_get_link_info_given_file_contents (const char  *file_contents,
                                     int          link_file_size,
                                     const char  *file_uri,
                                     char       **uri,
                                     char       **name,
                                     char       **icon,
                                     gboolean    *is_launcher,
                                     gboolean    *is_foreign)
{
      GKeyFile *key_file;
      char *type;
      char **only_show_in;
      char **not_show_in;

      key_file = g_key_file_new ();
      if (!g_key_file_load_from_data (key_file,
                              file_contents,
                              link_file_size,
                              G_KEY_FILE_NONE,
                              NULL)) {
            g_key_file_free (key_file);
            return; 
      }

      *uri = nautilus_link_get_link_uri_from_desktop (key_file, file_uri);
      *name = nautilus_link_get_link_name_from_desktop (key_file);
      *icon = nautilus_link_get_link_icon_from_desktop (key_file);

      *is_launcher = FALSE;
      type = g_key_file_get_string (key_file, MAIN_GROUP, "Type", NULL);
      if (g_strcmp0 (type, "Application") == 0 &&
          g_key_file_has_key (key_file, MAIN_GROUP, "Exec", NULL)) {
            *is_launcher = TRUE;
      }
      g_free (type);

      *is_foreign = FALSE;
      only_show_in = g_key_file_get_string_list (key_file, MAIN_GROUP,
                                       "OnlyShowIn", NULL, NULL);
      if (only_show_in && !string_array_contains (only_show_in, "GNOME")) {
            *is_foreign = TRUE;
      }
      g_strfreev (only_show_in);

      not_show_in = g_key_file_get_string_list (key_file, MAIN_GROUP,
                                      "NotShowIn", NULL, NULL);
      if (not_show_in && string_array_contains (not_show_in, "GNOME")) {
            *is_foreign = TRUE;
      }
      g_strfreev (not_show_in);

      g_key_file_free (key_file);
}

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