Ask user to set his file manager in case he didn't set it yet when trying to

open folder. Based on the patch from eternalswd, thanks.

glade/preferences_dialog.glade

@@ -2315,7 +2315,8 @@ HTTP W/ Auth</property>
                                               <widget class="GtkComboBoxEntry" id="combo_file_manager">
                                                 <property name="visible">True</property>
                                                 <property name="events">GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK | GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK</property>
-                                                <property name="items" translatable="yes">Konqueror
+                                                <property name="items" translatable="yes">-- Choose one --
+Konqueror
 Nautilus
 Thunar</property>
                                                 <child internal-child="entry">

src/common.py

@@ -179,4 +179,4 @@ class EncLevel:
 class ProxyType:
     none, socks4, socks5, socks5_pw, http, http_pw = range(6)
 class FileManager:
-    konqueror, nautilus, thunar = range(3)
+    choose_one, konqueror, nautilus, thunar = range(4)

src/interface.py

@@ -625,11 +625,19 @@ class DelugeGTK:
 
     def open_folder(self, widget):
         if self.config.get("open_folder_stock"):
-            if self.config.get("file_manager") == 0:
+            if self.config.get("file_manager") == common.FileManager.choose_one:
+                msgBox = gtk.MessageDialog(parent = None, buttons = gtk.BUTTONS_OK, 
+                    message_format = (_("Please set a default file manager in the Other tab in the Preferences.")))
+                msgBox.set_position(gtk.WIN_POS_CENTER_ALWAYS)
+                msgBox.set_transient_for(self.window)
+                msgBox.run()
+                msgBox.destroy()
+                return
+            if self.config.get("file_manager") == common.FileManager.konqueror:
                 file_manager = "konqueror"
-            if self.config.get("file_manager") == 1:
+            if self.config.get("file_manager") == common.FileManager.nautilus:
                 file_manager = "nautilus"
-            if self.config.get("file_manager") == 2:
+            if self.config.get("file_manager") == common.FileManager.thunar:
                 file_manager = "thunar"
         elif self.config.get("open_folder_custom"):
             file_manager = self.config.get("open_folder_location")

src/pref.py

@@ -40,7 +40,7 @@ import common
 import os.path
 
 DEFAULT_PREFS = {
-    "file_manager" : common.FileManager.nautilus,
+    "file_manager" : common.FileManager.choose_one,
     "open_folder_stock" : True,
     "open_folder_custom" : False,
     "open_folder_location": "",