[module/battery] Add remaining time, if available

Add remaining time directly to widget, if available, and if not on
charge.

see #146

bumblebee/util.py

@@ -1,6 +1,7 @@
 # -*- coding: utf-8 -*-
 
 import shlex
+import datetime
 import logging
 import subprocess
 
@@ -45,12 +46,19 @@ def bytefmt(num):
         num /= 1024.0
     return "{:.2f}GiB".format(num*1024.0)
 
-def durationfmt(duration):
+def durationfmt(duration, shorten=False, suffix=False):
+    duration = int(duration)
     minutes, seconds = divmod(duration, 60)
     hours, minutes = divmod(minutes, 60)
+    suf = "m"
     res = "{:02d}:{:02d}".format(minutes, seconds)
-    if hours > 0: res = "{:02d}:{}".format(hours, res)
+    if hours > 0:
+        if shorten:
+            res = "{:02d}:{:02d}".format(hours, minutes)
+        else:
+            res = "{:02d}:{}".format(hours, res)
+        suf = "h"
 
-    return res
+    return "{}{}".format(res, suf if suffix else "")
 
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