[modules] Add help texts

see #23

bumblebee/modules/battery.py

@@ -1,5 +1,13 @@
 # pylint: disable=C0111,R0903
 
+"""Displays battery status, remaining percentage and charging information.
+
+Parameters:
+    * battery.device  : The device to read information from (defaults to BAT0)
+    * battery.warning : Warning threshold in % of remaining charge (defaults to 20)
+    * battery.critical: Critical threshold in % of remaining charge (defaults to 10)
+"""
+
 import os
 
 import bumblebee.input

bumblebee/modules/cmus.py

@@ -1,6 +1,10 @@
 # pylint: disable=C0111,R0903
 
-"""Displays information about the current song in cmus."""
+"""Displays information about the current song in cmus.
+
+Parameters:
+    * cmus.format: Format string for the song information. Tag values can be put in curly brackets (i.e. {artist})
+"""
 
 from collections import defaultdict
 

bumblebee/modules/nic.py

@@ -1,5 +1,11 @@
 #pylint: disable=C0111,R0903
 
+"""Displays the name, IP address(es) and status of each available network interface.
+
+Parameters:
+    * nic.exclude: Comma-separated list of interface prefixes to exclude (defaults to "lo,virbr,docker,vboxnet,veth")
+"""
+
 import netifaces
 
 import bumblebee.util
@@ -7,8 +13,6 @@ import bumblebee.input
 import bumblebee.output
 import bumblebee.engine
 
-"""Displays the name, IP address(es) and status of each available network interface."""
-
 class Module(bumblebee.engine.Module):
     def __init__(self, engine, config):
         widgets = []