battery

#!/bin/bash

#  Description
#  ----------
#  One more script to show battery status as bar(s). Difference from other solutions:
#
#  * Simplicity, duh
#  * Acknowledges the fact that there were sometimes more than one battery in laptop
#    - Will display capacity for all batteries
#  * Also the fact that there were sometimes no battery at all!
#    - No error in this case
#  * Old batteries usually max at ≈99, so it has same symbol as 100
#  * Can work with [indicator-sysmonitor](https://github.com/fossfreedom/indicator-sysmonitor)
#  * [Spark](https://github.com/holman/spark) could be used here, but this solution is even simpler

#  Author: [Dmitry](http://dmi3.net) [Source](https://github.com/dmi3/bin)

#  Usage
#  -----
#      $ battery # multiple batteries are installed
#      🔌 ▄▇
#      $ battery # single battery is installed
#      🔌 ▇
#      $ battery # no battery is installed
#      🔌

grep -q 0 /sys/class/power_supply/AC/online 2> /dev/null && echo -n "🔋 " || echo -n "🔌 " 

for capacity in /sys/class/power_supply/BAT*/capacity; do
    case $(cat $capacity 2> /dev/null) in 
        [0-9])  echo -n "▁" ;;
        [1-2]?) echo -n "▂" ;;
        [3-4]?) echo -n "▃" ;;
        [5-6]?) echo -n "▄" ;;
        [7-8]?) echo -n "▅" ;;
        9?)     echo -n "▇" ;; 
        100)    echo -n "▇" ;;
    esac
done