[output] Allow modules to pass back a single widget

Since "single widget" is the 99% use-case, make it easier for a module
to return a single widget.

bumblebee/modules/battery.py

@@ -22,9 +22,7 @@ class Module(bumblebee.module.Module):
             self._capacity = int(f.read())
         self._capacity = self._capacity if self._capacity < 100 else 100
 
-        return [
-            bumblebee.output.Widget(self,"{:02d}%".format(self._capacity))
-        ]
+        return bumblebee.output.Widget(self,"{:02d}%".format(self._capacity))
 
     def warning(self):
         return self._capacity < self._config.parameter("battery.warning", 20)

bumblebee/modules/cpu.py

@@ -21,11 +21,7 @@ class Module(bumblebee.module.Module):
 
     def widgets(self):
         self._perc = psutil.cpu_percent(percpu=False)
-        return [
-            bumblebee.output.Widget(self,
-                "{:05.02f}%".format(self._perc)
-            )
-        ]
+        return bumblebee.output.Widget(self, "{:05.02f}%".format(self._perc))
 
     def warning(self):
         return self._perc > self._config.parameter("cpu.warning", 70)

bumblebee/modules/time.py

@@ -32,10 +32,6 @@ class Module(bumblebee.module.Module):
         self._fmt = config.parameter(param_name, default)
 
     def widgets(self):
-        return [
-            bumblebee.output.Widget(self,
-                datetime.datetime.now().strftime(self._fmt)
-            )
-        ]
+        return bumblebee.output.Widget(self, datetime.datetime.now().strftime(self._fmt))
 
 # vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4

bumblebee/output.py

@@ -66,6 +66,11 @@ class Output(object):
         pass
 
     def draw(self, widgets, theme):
+        if not type(widgets) is list:
+            widgets = [ widgets ]
+        self._draw(widgets, theme)
+
+    def _draw(self, widgets, theme):
         pass
 
     def flush(self):

bumblebee/outputs/i3.py

@@ -42,7 +42,7 @@ class Output(bumblebee.output.Output):
     def start(self):
         print json.dumps({ "version": 1, "click_events": True }) + "["
 
-    def draw(self, widgets, theme):
+    def _draw(self, widgets, theme):
         for widget in widgets:
             if theme.separator(widget):
                 self._data.append({