Screen changer

_scrn.sh

#!/usr/bin/bash

# LAYOUT SWITCHER
# This script provides following functionality:
# - When detect is given, the 
# - When no argument is given, make a dmenu list of the available screen layouts
# Last two options are mostly used by the udev system

BASE_PATH="/home/sh/.screenlayout"
AVAILABLE_LAYOUTS=$(ls -1 $BASE_PATH | awk -F '.' '{ print $1 }')

export DISPLAY=":0"
export XAUTHORITY=/home/sh/.Xauthority

# apparently we don't have any env vars, so make sure path is set for subsequent
# scripts
export PATH="$PATH:/usr/bin" 

if [[ $1 == "detect" ]]; then
    state=$(cat /sys/class/drm/card0/card0-HDMI-A-1/status)

    if [[ $state == 'disconnected' ]]; then
        layout="laptop_only.sh"
    else
        /usr/bin/xrandr --query
        # TODO this is *very* static...
        # What if the monitor is plugged somewhere else?
        # maybe we could loop and see what is connected?
        model=$(cat /sys/class/drm/card0/card0-HDMI-A-1/edid | parse-edid | grep 'ModelName') 

        # echo is needed to strip from leading and trailing whitespace
        if [[ $(echo $model) == 'ModelName "DELL U2715H"' ]]; then
            layout="liip.sh"
        else
            exit 1
        fi
    fi
else
    layout=$(echo -n "$AVAILABLE_LAYOUTS" | dmenu -l 10)
    layout="$layout.sh"
fi


/usr/bin/bash "$BASE_PATH/$layout"
/usr/bin/bash  /home/sh/.fehbg
/usr/bin/setxkbmap -layout ch