[modules/xrandr] Add display on/off toggling

This one is a bit tricky:
* Clicking on an active xrandr output will disable it
* Clicking on a disabled xrandr output will enable it -> if
  it is a left-click, it will put it as the left-most display
  if it is a right-click, as the right-most display

Also, it will reload the i3 bars (using a script that allows
you to write custom pieces of an i3 configuration that is applied
conditionally depending on the screens you have).

It goes like this:
* Base config is in ~/.i3/config.template
* Output-specific config is in ~/.i3/config.<screen name>
* Output-specific config when other screens are also active is in
  ~/.i3/config.<screen>-<other-screens-in-alphabetic-order>

For instance:
$ ls ~/.i3
config.template
config.eDP1 -> will be applied to eDP1 (always)
config.VGA1-eDP1 -> will be applied to VGA1, if eDP1 is also active
config.VGA1 -> will be applied to VGA1 (if eDP1 is inactive)

fixes #19

bin/load-i3-bars.sh

@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+
+if [ ! -f ~/.i3/config.template ]; then
+	cp ~/.i3/config ~/.i3/config.template
+else
+	cp ~/.i3/config.template ~/.i3/config
+fi
+
+screens=$(xrandr -q|grep ' connected'| grep -P '\d+x\d+' |cut -d' ' -f1)
+
+echo "screens: $screens"
+
+while read -r line; do
+	screen=$(echo $line | cut -d' ' -f1)
+	others=$(echo $screens|tr ' ' '\n'|grep -v $screen|tr '\n' '-'|sed 's/.$//')
+
+	if [ -f ~/.i3/config.$screen-$others ]; then
+		cat ~/.i3/config.$screen-$others >> ~/.i3/config
+	else
+		if [ -f ~/.i3/config.$screen ]; then
+			cat ~/.i3/config.$screen >> ~/.i3/config
+		fi
+	fi
+done <<< "$screens"
+
+i3-msg restart

bin/toggle-display.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+
+echo $(dirname $(readlink -f "$0"))
+
+i3bar_update=$(dirname $(readlink -f "$0"))/load-i3-bars.sh
+
+xrandr "$@"
+
+if [ -f $i3bar_update ]; then
+	sleep 1
+	$i3bar_update
+fi

bumblebee/modules/xrandr.py

@@ -1,5 +1,7 @@
 import bumblebee.module
+import bumblebee.util
 import re
+import os
 import sys
 import subprocess
 
@@ -13,7 +15,30 @@ def parameters():
 class Module(bumblebee.module.Module):
     def __init__(self, output, config, alias):
         super(Module, self).__init__(output, config, alias)
-        self._state = "off"
+
+        self._widgets = []
+
+    def toggle(self, event, widget):
+        path = os.path.dirname(os.path.abspath(__file__))
+        toggle_cmd = "{}/../../bin/toggle-display.sh".format(path)
+
+        if widget.get("state") == "on":
+            bumblebee.util.execute("{} --output {} --off".format(toggle_cmd, widget.get("display")))
+        else:
+            neighbor = None
+            for w in self._widgets:
+                if w.get("state") == "on":
+                    neighbor = w
+                    if event.get("button") == 1:
+                        break
+    
+            if neighbor == None:
+                bumblebee.util.execute("{} --output {} --auto".format(toggle_cmd,
+                    widget.get("display")))
+            else:
+                bumblebee.util.execute("{} --output {} --auto --{}-of {}".format(toggle_cmd,
+                    widget.get("display"), "left" if event.get("button") == 1 else "right",
+                    neighbor.get("display")))
 
     def widgets(self):
         process = subprocess.Popen([ "xrandr", "-q" ], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
@@ -21,29 +46,39 @@ class Module(bumblebee.module.Module):
 
         widgets = []
 
-        # TODO: sort by position
         for line in output.split("\n"):
             if not " connected" in line:
                 continue
-            screen = line.split(" ", 2)[0]
+            display = line.split(" ", 2)[0]
             m = re.search(r'\d+x\d+\+(\d+)\+\d+', line)
 
-            widget = bumblebee.output.Widget(self, screen)
+            widget = bumblebee.output.Widget(self, display, instance=display)
+            widget.set("display", display)
+
+            # not optimal (add callback once per interval), but since
+            # add_callback() just returns if the callback has already
+            # been registered, it should be "ok"
+            self._output.add_callback(module=display, button=1,
+                cmd=self.toggle)
+            self._output.add_callback(module=display, button=3,
+                cmd=self.toggle)
             if m:
-                self._state = "on"
+                widget.set("state", "on")
                 widget.set("pos", int(m.group(1)))
             else:
-                self._state = "off"
-                widget.set("pos", sys.maxint());
+                widget.set("state", "off")
+                widget.set("pos", sys.maxint)
 
             widgets.append(widget)
 
         widgets.sort(key=lambda widget : widget.get("pos"))
 
+        self._widgets = widgets
+
         return widgets
 
     def state(self, widget):
-        return self._state
+        return widget.get("state", "off")
 
     def warning(self, widget):
         return False

bumblebee/output.py

@@ -15,6 +15,8 @@ class Widget(object):
         self._store = {}
         self._instance = instance
 
+        obj._output.register_widget(self.instance(), self)
+
     def set(self, key, value):
         self._store[key] = value
 
@@ -40,14 +42,19 @@ class Widget(object):
         return self._text
 
 class Command(object):
-    def __init__(self, command):
+    def __init__(self, command, event, widget):
         self._command = command
+        self._event = event
+        self._widget = widget
 
     def __call__(self, *args, **kwargs):
         if not isinstance(self._command, list):
             self._command = [ self._command ]
 
         for cmd in self._command:
+            if inspect.ismethod(cmd):
+                cmd(self._event, self._widget)
+            else:
                 c = cmd.format(*args, **kwargs)
                 DEVNULL = open(os.devnull, 'wb')
                 subprocess.Popen(shlex.split(c), stdout=DEVNULL, stderr=DEVNULL).communicate()
@@ -58,6 +65,10 @@ class Output(object):
         self._callbacks = {}
         self._wait = threading.Condition()
         self._wait.acquire()
+        self._widgets = {}
+
+    def register_widget(self, identity, widget):
+        self._widgets[identity] = widget
 
     def redraw(self):
         self._wait.acquire()
@@ -84,9 +95,9 @@ class Output(object):
             event.get("button", -1),
             event.get("instance", event.get("name", None)),
         ), cb)
-        if inspect.isfunction(cb) or cb is None: return cb
 
-        return Command(cb)
+        identity = event.get("instance", event.get("name", None))
+        return Command(cb, event, self._widgets.get(identity, None))
 
     def wait(self):
         self._wait.wait(self._config.parameter("interval", 1))

bumblebee/util.py

@@ -1,3 +1,6 @@
+import shlex
+import exceptions
+import subprocess
 
 def bytefmt(num):
     for unit in [ "", "Ki", "Mi", "Gi" ]:
@@ -13,3 +16,11 @@ def durationfmt(duration):
     if hours > 0: res = "{:02d}:{}".format(hours, res)
 
     return res
+
+def execute(cmd):
+    args = shlex.split(cmd)
+    p = subprocess.Popen(args, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
+    out = p.communicate()
+
+    if p.returncode != 0:
+        raise exceptions.RuntimeError("{} exited with {}".format(cmd, p.returncode))