[core] Add option to draw widgets right-to-left

fixes #295

bumblebee-status

@@ -39,7 +39,7 @@ def main():
             )
 
     theme = bumblebee.theme.Theme(config.theme(), config.iconset())
-    output = bumblebee.output.I3BarOutput(theme=theme)
+    output = bumblebee.output.I3BarOutput(theme=theme, config=config)
     inp = bumblebee.input.I3BarInput()
     engine = None
 

bumblebee/config.py

@@ -57,6 +57,8 @@ def create_parser():
         help=LIST_HELP)
     parser.add_argument("-d", "--debug", action="store_true",
         help=DEBUG_HELP)
+    parser.add_argument("-r", "--right-to-left", action="store_true",
+        help="Draw widgets from right to left, rather than left to right (which is the default)")
     parser.add_argument("-f", "--logfile", default="~/bumblebee-status-debug.log",
         help="Location of the debug log file")
     parser.add_argument("-i", "--iconset", default="auto",
@@ -100,6 +102,9 @@ class Config(bumblebee.store.Store):
     def debug(self):
         return self._args.debug
 
+    def reverse(self):
+        return self._args.right_to_left
+
     def logfile(self):
         return os.path.expanduser(self._args.logfile)
 

bumblebee/output.py

@@ -83,10 +83,11 @@ class Widget(bumblebee.store.Store):
 
 class I3BarOutput(object):
     """Manage output according to the i3bar protocol"""
-    def __init__(self, theme):
+    def __init__(self, theme, config=None):
         self._theme = theme
         self._widgets = []
         self._started = False
+        self._config = config
 
     def started(self):
         return self._started
@@ -143,7 +144,10 @@ class I3BarOutput(object):
 
     def flush(self):
         """Flushes output"""
-        sys.stdout.write(json.dumps(self._widgets))
+        widgets = self._widgets
+        if self._config and self._config.reverse():
+            widgets = list(reversed(widgets))
+        sys.stdout.write(json.dumps(widgets))
 
     def end(self):
         """Finalizes output"""