#!/bin/bash

# $ xrandr --version
# xrandr program version       1.5.0
# Server reports RandR version 1.5

# README if you want
# (pretty sure no one's going to find this gist but guess there's no harm lol)

# I have 2 monitors and only wanted to toggle the rotation of only one between normal and left
# executing `xrandr` will give you all of your displays and their names (also resolutions etc). mine are HDMI-1 and HDMI-2

# rotations can be: normal|left|inverted|right|x axis|y axis
# last two mean the displays are mirrored in respective axes if you're into that sort of thing

# defaults. these are common for both scenarios I wanted. I always set them to make sure the values are correct
xrandr --output HDMI-2 --rotate normal
xrandr --output HDMI-1 --pos 1920x0

# getting HDMI-1's orientation into a variable:
orientation=$(xrandr | grep -o -P 'HDMI-1 .+ (\d{4}x\d{4}\+\d{1,4}\+\d{1,4}) \K(left|inverted|right|x axis|y axis)?')
# "\K" means "don't include the left part in the output string" (doesn't affect matching)
# -o means take only the matching string (instead of the entire line)
# with this regex, $orientation is left/others or empty string for normal.

# regex for matching everything in the line:
# (.+) (connected|disconnected)( primary)?(?: ([0-9]{1,5}x[0-9]{1,5})\+([0-9]{1,5})\+([0-9]{1,5}))?( left| inverted| right| x axis| y axis)? \(normal left inverted right x axis y axis\)( \d+mm x \d+mm)?

# toggle HDMI-1's rotation and vertically center HDMI-2 to HDMI-1
if [ $orientation  == "left" ]; then
    xrandr --output HDMI-1 --rotate normal
    xrandr --output HDMI-2 --pos 0x0
else
    xrandr --output HDMI-1 --rotate left
    xrandr --output HDMI-2 --pos 0x420
fi