[bug 802] - Ability to undo or restore changes to the preferences #802

- added basic config restore option from preferences window
 - changes to glade made in addition to addition of destory signal
 - minor cleaup in config to have a single function return confilg filename via get_config_filename

terminatorlib/config.py

@@ -622,12 +622,7 @@ class ConfigBase(Borg):
             dbg('config already loaded')
             return
 
-        if self.command_line_options and self.command_line_options.config:
-            filename = self.command_line_options.config
-        else:
-            filename = os.path.join(get_config_dir(), 'config')
-            if not os.path.exists(filename):
-                filename = os.path.join(get_system_config_dir(), 'config')
+        filename = self.get_config_filename()
         dbg('looking for config file: %s' % filename)
         try:
             #
@@ -706,6 +701,35 @@ class ConfigBase(Borg):
 
         self.loaded = True
 
+    def get_config_filename(self):
+        filename = ''
+        if self.command_line_options and self.command_line_options.config:
+            filename = self.command_line_options.config
+        else:
+            filename = os.path.join(get_config_dir(), 'config')
+            if not os.path.exists(filename):
+                filename = os.path.join(get_system_config_dir(), 'config')
+
+        return filename
+
+    def save_config_with_suffix(self, suffix):
+        filename = self.get_config_filename()
+        #save the current config, to revert any changes make in preferences
+        cur_loaded_file = filename + suffix
+        shutil.copy2(filename, cur_loaded_file)
+
+    def restore_config_with_suffix(self, suffix):
+        filename = self.get_config_filename()
+        cur_loaded_file = filename + suffix
+        dbg("restoring from file:%s to file:%s" % (cur_loaded_file, filename))
+        shutil.copy2(cur_loaded_file, filename)
+
+    def remove_config_with_suffix(self, suffix):
+        filename = self.get_config_filename()
+        cur_loaded_file = filename + suffix
+        if os.path.exists(cur_loaded_file):
+            os.remove(cur_loaded_file)
+
     def reload(self):
         """Force a reload of the base config"""
         self.loaded = False

terminatorlib/preferences.glade

@@ -424,6 +424,7 @@
     <property name="title" translatable="yes">Terminator Preferences</property>
     <property name="default-width">640</property>
     <property name="default-height">400</property>
+    <signal name="destroy" handler="on_destroy_event" swapped="no"/>
     <child>
       <object class="GtkBox" id="dialog_vbox1">
         <property name="visible">True</property>
@@ -1241,7 +1242,7 @@
                               </packing>
                             </child>
                             <child>
-                              <!-- n-columns=2 n-rows=4 -->
+                              <!-- n-columns=2 n-rows=5 -->
                               <object class="GtkGrid" id="grid4">
                                 <property name="visible">True</property>
                                 <property name="can-focus">False</property>
@@ -4410,6 +4411,21 @@ Much of the behavior of Terminator is based on GNOME Terminal, and we are adding
                 <property name="position">0</property>
               </packing>
             </child>
+            <child>
+              <object class="GtkButton" id="restoreconfigbutton">
+                <property name="label">Discard Changes</property>
+                <property name="use-action-appearance">False</property>
+                <property name="visible">True</property>
+                <property name="can-focus">True</property>
+                <property name="receives-default">True</property>
+                <signal name="clicked" handler="on_restoreconfigbutton_clicked" swapped="no"/>
+              </object>
+              <packing>
+                <property name="expand">True</property>
+                <property name="fill">True</property>
+                <property name="position">1</property>
+              </packing>
+            </child>
             <child>
               <object class="GtkButton" id="okbutton">
                 <property name="label">gtk-close</property>
@@ -4423,7 +4439,7 @@ Much of the behavior of Terminator is based on GNOME Terminal, and we are adding
               <packing>
                 <property name="expand">True</property>
                 <property name="fill">True</property>
-                <property name="position">1</property>
+                <property name="position">2</property>
               </packing>
             </child>
           </object>

terminatorlib/prefseditor.py

@@ -235,14 +235,25 @@ class PrefsEditor:
         nb = guiget('notebook1')
         nb.set_current_page(cur_page)
 
+        self.config.base.save_config_with_suffix('_cur')
+
+    def on_destroy_event(self, _widget):
+        self.config.base.remove_config_with_suffix('_cur')
+
     def on_closebutton_clicked(self, _button):
         """Close the window"""
+        self.config.base.remove_config_with_suffix('_cur')
         terminator = Terminator()
         terminator.reconfigure()
         self.window.destroy()
         self.calling_window.preventHide = False
         del(self)
 
+    def on_restoreconfigbutton_clicked(self, _button):
+        """restore config to load time"""
+        self.config.base.restore_config_with_suffix('_cur')
+        self.on_closebutton_clicked(_button)
+
     def set_values(self):
         """Update the preferences window with all the configuration from
         Config()"""