[config] Allow parameter passing via commandline

Allow the user to specify arbitrary configuration parameters from the
commandline and evaluate those in the modules (and elsewhere). Re-enable
the CPU module as a first showcase of this functionality.

bumblebee/config.py

@@ -47,9 +47,16 @@ class Config(object):
 
         self._args = self._parser.parse_args(args)
 
+        for p in self._args.parameters:
+            key, value = p.split("=")
+            self.parameter(key, value)
+
+    def set(self, name, value):
+        self._store[name] = value
+
     def parameter(self, name, default=None):
         if not name in self._store:
-            self._store[name] = default
+            self.set(name, default)
         return self._store.get(name, default)
 
     def increase(self, name, limit, default):
@@ -76,6 +83,10 @@ class Config(object):
             choices = [ "modules", "themes" ],
             action=print_usage,
         )
+        parser.add_argument("-p", "--parameters", nargs="+",
+            help="Provide configuration parameters to individual modules.",
+            default=[]
+        )
         parser.add_argument("-t", "--theme", help="Specify which theme to use for "
             "drawing the modules",
             default="default",

bumblebee/modules/cpu.py

@@ -11,22 +11,27 @@ def description():
     return "Displays CPU utilization across all CPUs."
 
 class Module(bumblebee.module.Module):
-    def __init__(self, output, args):
-        super(Module, self).__init__(args)
+    def __init__(self, output, config):
+        super(Module, self).__init__(output, config)
         self._perc = psutil.cpu_percent(percpu=False)
+        self._config = config
 
-        output.add_callback(module=self.__module__, button=1,
-            cmd="gnome-system-monitor")
+# TODO
+#        output.add_callback(module=self.__module__, button=1,
+#            cmd="gnome-system-monitor")
 
-    def data(self):
+    def widgets(self):
         self._perc = psutil.cpu_percent(percpu=False)
-
-        return "{:05.02f}%".format(self._perc)
+        return [
+            bumblebee.output.Widget(self,
+                "{:05.02f}%".format(self._perc)
+            )
+        ]
 
     def warning(self):
-        return self._perc > 70
+        return self._perc > self._config.parameter("cpu.warning", 70)
 
     def critical(self):
-        return self._perc > 80
+        return self._perc > self._config.parameter("cpu.critical", 80)
 
 # vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4

bumblebee/theme.py

@@ -19,7 +19,7 @@ class Theme:
         self.begin()
 
     def begin(self):
-        self._config.parameter("theme.cycleidx", 0)
+        self._config.set("theme.cycleidx", 0)
         self._cycle = self._cycles[0] if len(self._cycles) > 0 else {}
         self._background = [ None, None ]
 
@@ -64,7 +64,7 @@ class Theme:
         return self._background[1]
 
     def separator_block_width(self, widget):
-        return 9
+        return self._get(widget, "separator-block-width")
 
     def _get(self, widget, name):
         module = widget.module()

bumblebee/themes/solarized-powerline.json

@@ -18,6 +18,7 @@
 		"bg-warning": "#b58900",
 
 		"default-separators": false,
+		"separator-block-width": 0,
 		"separator": ""
 	},
 	"date": {