[modules/layout] Add rotation logic and language parameter

User can now specify a list of languages as parameter (pipe-separated
list). Variants can also be specified by separating language and variant
with a :

For instance: -p layout.lang="us|rs:latin"

Left click moves on to the next language, right click to the previous.

Right now, there are the following caveats:
* The first entry in the list must be the language used when the bar
  starts
* kxbd changes outside the bar are not picked up automatically

bumblebee/modules/layout.py

@@ -6,36 +6,40 @@ import bumblebee.util
 def description():
     return "Showws current keyboard layout and change it on click."
 
-#def parameters():
-#    module = __name__.split(".")[-1]
-#    return 
+def parameters():
+    return  [
+        "layout.lang: pipe-separated list of languages to cycle through (e.g. us|rs|de). Default: en"
+    ]
 
 
 class Module(bumblebee.module.Module):
     def __init__(self, output, config, alias):
         super(Module, self).__init__(output, config, alias)
 
+        self._languages = self._config.parameter("lang", "en").split("|")
+        self._idx = 0
 
-        # click
-        output.add_callback(module="layout.cir", button=1, cmd="setxkbmap us")
-        output.add_callback(module="layout.us", button=1, cmd="setxkbmap rs")
-        output.add_callback(module="layout.rs", button=1, cmd="setxkbmap -layout rs -variant latin")
+        output.add_callback(module=self.instance(), button=1, cmd=self.next_keymap)
+        output.add_callback(module=self.instance(), button=3, cmd=self.prev_keymap)
 
+    def next_keymap(self, event, widget):
+        self._idx = self._idx + 1 if self._idx < len(self._languages) - 1 else 0
+        self.set_keymap()
 
+    def prev_keymap(self, event, widget):
+        self._idx = self._idx - 1 if self._idx > 0 else len(self._languages) - 1
+        self.set_keymap()
 
+    def set_keymap(self):
+        tmp = self._languages[self._idx].split(":")
+        layout = tmp[0]
+        variant = ""
+        if len(tmp) > 1:
+            variant = "-variant {}".format(tmp[1])
+        bumblebee.util.execute("setxkbmap -layout {} {}".format(layout, variant))
 
     def widgets(self):
-        output = subprocess.check_output(["setxkbmap", "-print"], stderr=subprocess.STDOUT)
-        for line in str(output).split("\\n"):
-            if "xkb_symbols" in line:
-                res = line.split("\"")[1].split("+")[1]
-        
-        if res == "rs":
-            return bumblebee.output.Widget(self, res, instance="layout.rs")
-        elif res == "us":
-            return bumblebee.output.Widget(self, res, instance="layout.us")
-        else:
-            return bumblebee.output.Widget(self, res, instance="layout.cir")
-
+        lang = self._languages[self._idx]
+        return bumblebee.output.Widget(self, lang)
 
 # vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4

bumblebee/output.py

@@ -93,10 +93,10 @@ class Output(object):
         ), None)
         cb = self._callbacks.get((
             event.get("button", -1),
-            event.get("instance", event.get("name", None)),
+            event.get("instance", event.get("module", None)),
         ), cb)
 
-        identity = event.get("instance", event.get("name", None))
+        identity = event.get("instance", event.get("module", None))
         return Command(cb, event, self._widgets.get(identity, None))
 
     def wait(self):