-Add on_load and on_activated to find trailing spaces without being forced to edit file

-Add Command to toggle on/off searching for trailing spaces
-Initiate trailing space search on toggle "on"
-Clear highlights on toggle "off"
-Simplify find_trailing_spaces function

trailing_spaces.py

@@ -21,18 +21,17 @@ import sublime, sublime_plugin
 
 DEFAULT_MAX_FILE_SIZE    = 1048576
 DEFAULT_COLOR_SCOPE_NAME = "invalid"
+DEFAULT_IS_ENABLED       = False
+
+#Set whether the plugin is on or off
+TrailingSpacesEnabled = DEFAULT_IS_ENABLED
 
 # Return an array of regions matching trailing spaces.
 def find_trailing_spaces(view):
-    trails = view.find_all('[ \t]+$')
-    regions = []
-    for trail in trails:
-      regions.append(trail)
-    return regions
+    return view.find_all('[ \t]+$')
 
-# Highlight matching regions.
-class TrailingSpacesHighlightListener(sublime_plugin.EventListener):
-    def on_modified(self, view):
+# Highlight trailing spaces
+def highlight_trailing_spaces(view):
     max_size = view.settings().get('trailing_spaces_file_max_size',
                                    DEFAULT_MAX_FILE_SIZE)
     color_scope_name = view.settings().get('trailing_spaces_highlight_color',
@@ -43,11 +42,41 @@ class TrailingSpacesHighlightListener(sublime_plugin.EventListener):
                          regions, color_scope_name,
                          sublime.DRAW_EMPTY)
 
+# Clear all trailing spaces
+def clear_trailing_spaces_highlight(window):
+    for view in window.views():
+        view.erase_regions('TrailingSpacesHighlightListener')
+
+# Toggle the event listner on or off
+class ToggleTrailingSpacesCommand(sublime_plugin.WindowCommand):
+    def run(self):
+        global TrailingSpacesEnabled
+        TrailingSpacesEnabled = False if(TrailingSpacesEnabled) else True
+
+        # If toggling on go ahead and perform a pass, if not clear the highlighting in all views
+        if(TrailingSpacesEnabled):
+            highlight_trailing_spaces(self.window.active_view())
+        else:
+            clear_trailing_spaces_highlight(self.window)
+
+# Highlight matching regions.
+class TrailingSpacesHighlightListener(sublime_plugin.EventListener):
+    def on_modified(self, view):
+        if(TrailingSpacesEnabled):
+            highlight_trailing_spaces(view)
+
+    def on_activated(self,view):
+        if(TrailingSpacesEnabled):
+            highlight_trailing_spaces(view)
+
+    def on_load(self,view):
+        if(TrailingSpacesEnabled):
+            highlight_trailing_spaces(view)
+
 # Allows to erase matching regions.
 class DeleteTrailingSpacesCommand(sublime_plugin.TextCommand):
     def run(self, edit):
         regions = find_trailing_spaces(self.view)
-
         if regions:
             # deleting a region changes the other regions positions, so we
             # handle this maintaining an offset