[modules/layout] Re-enable keyboard layout switcher

Displays the current layout and allows switching to next/previous
configured layout via mouse clicks.

bumblebee/modules/layout.py

@@ -0,0 +1,71 @@
+# pylint: disable=C0111,R0903
+
+"""Displays and changes the current keyboard layout
+
+Parameters:
+    * layout.lang: pipe-separated list of languages to cycle through (e.g. us|rs|de). Default: en
+"""
+
+import bumblebee.util
+import bumblebee.input
+import bumblebee.output
+import bumblebee.engine
+
+class Module(bumblebee.engine.Module):
+    def __init__(self, engine, config):
+        super(Module, self).__init__(engine, config,
+            bumblebee.output.Widget(full_text=self.layout)
+        )
+        self._languages = self.parameter("lang", "us").split("|")
+        self._idx = 0
+
+        engine.input.register_callback(self, button=bumblebee.input.LEFT_MOUSE,
+            cmd=self._next_keymap)
+        engine.input.register_callback(self, button=bumblebee.input.RIGHT_MOUSE,
+            cmd=self._prev_keymap)
+
+    def _next_keymap(self, event):
+        self._idx = (self._idx + 1) % len(self._languages)
+        self._set_keymap()
+
+    def _prev_keymap(self, event):
+        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])
+        try:
+            bumblebee.util.execute("setxkbmap -layout {} {}".format(layout, variant))
+        except RuntimeError:
+            pass
+
+    def layout(self, widget):
+        try:
+            res = bumblebee.util.execute("setxkbmap -query")
+        except RuntimeError:
+            return "n/a"
+        layout = ""
+        variant = None
+        for line in res.split("\n"):
+            if not line:
+                continue
+            if "layout" in line:
+                layout = line.split(":")[1].strip()
+            if "variant" in line:
+                variant = line.split(":")[1].strip()
+        if variant:
+            layout += ":" + variant
+
+        if layout in self._languages:
+            self._idx = self._languages.index(layout)
+        else:
+            self._languages.append(layout)
+            self._idx = len(self._languages) - 1
+
+        return layout
+
+# vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4

themes/icons/awesome-fonts.json

@@ -11,6 +11,7 @@
 	"dnf": { "prefix": "" },
 	"brightness": { "prefix": "" },
 	"load": { "prefix": "" },
+	"layout": { "prefix": "" },
 	"cmus": {
 		"playing": { "prefix": "" },
 		"paused": { "prefix": "" },