[modules/xrandr] Re-enable xrandr module

Displays the connected screens and allows the user to enable/disable
them.

see #23

bumblebee/engine.py

@@ -42,6 +42,12 @@ class Module(object):
             if widget.name == name:
                 return widget
 
+    def widget_by_id(self, uid):
+        for widget in self._widgets:
+            if widget.id == uid:
+                return widget
+        return None
+
     def update(self, widgets):
         """By default, update() is a NOP"""
         pass

bumblebee/modules/xrandr.py

@@ -0,0 +1,72 @@
+# pylint: disable=C0111,R0903
+
+"""Shows a widget for each connected screen and allows the user to enable/disable screens.
+
+"""
+
+import os
+import re
+import sys
+
+import bumblebee.util
+import bumblebee.input
+import bumblebee.output
+import bumblebee.engine
+
+class Module(bumblebee.engine.Module):
+    def __init__(self, engine, config):
+        widgets = []
+        self._engine = engine
+        super(Module, self).__init__(engine, config, widgets)
+        self.update_widgets(widgets)
+
+    def update_widgets(self, widgets):
+        new_widgets = []
+        for line in bumblebee.util.execute("xrandr -q").split("\n"):
+            if not " connected" in line:
+                continue
+            display = line.split(" ", 2)[0]
+            m = re.search(r'\d+x\d+\+(\d+)\+\d+', line)
+
+            widget = self.widget(display)
+            if not widget:
+                widget = bumblebee.output.Widget(full_text=display, name=display)
+                self._engine.input.register_callback(widget, button=1, cmd=self._toggle)
+                self._engine.input.register_callback(widget, button=3, cmd=self._toggle)
+            new_widgets.append(widget)
+            widget.set("state", "on" if m else "off")
+            widget.set("pos", int(m.group(1)) if m else sys.maxint)
+
+        while len(widgets) > 0:
+            del widgets[0]
+        for widget in new_widgets:
+            widgets.append(widget)
+
+    def update(self, widgets):
+        self.update_widgets(widgets)
+
+    def state(self, widget):
+        return widget.get("state", "off")
+
+    def _toggle(self, event):
+        path = os.path.dirname(os.path.abspath(__file__))
+        toggle_cmd = "{}/../../bin/toggle-display.sh".format(path)
+
+        widget = self.widget_by_id(event["instance"])
+
+        if widget.get("state") == "on":
+            bumblebee.util.execute("{} --output {} --off".format(toggle_cmd, widget.name))
+        else:
+            first_neighbor = next((widget for widget in self.widgets() if widget.get("state") == "on"), None)
+            last_neighbor = next((widget for widget in reversed(self.widgets()) if widget.get("state") == "on"), None)
+
+            neighbor = first_neighbor if event["button"] == bumblebee.input.LEFT_MOUSE else last_neighbor
+    
+            if neighbor == None:
+                bumblebee.util.execute("{} --output {} --auto".format(toggle_cmd, widget.name))
+            else:
+                bumblebee.util.execute("{} --output {} --auto --{}-of {}".format(toggle_cmd, widget.name,
+                    "left" if event.get("button") == bumblebee.input.LEFT_MOUSE else "right",
+                    neighbor.name))
+
+# vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4