Switch the layout of the connected monitors

switch-screenlayout.sh

#!/bin/bash
#
#  ╔═════╗ ╔═══╗
#  ║    S     ║ ║  V  ║  Screen Layout Switcher
#  ╚═════╝ ║       ║
#  ╔═════╗ ╚═══╝  Handle switching the layout of the connected monitors:
#  ║    P     ║              (S)econdary, (V)ertical, and (P)rimary
#  ╚═════╝               Usage: ./switch-screenlayout.sh [1-4]

# Debug options
# set -euxo pipefail

SELECTION=${1}
[[ ! ${SELECTION} ]] && echo "Pass a number from 1 to 4" && exit 1

MONITORS=$(xrandr | grep " connected")
PRIMARY=$(echo "$MONITORS" | grep primary | awk '{print $1}')
SECONDARY=$(echo "$MONITORS" | head -n2 | tail -n1 | awk '{print $1}')
VERTICAL=$(echo "$MONITORS" | tail -n1 | awk '{print $1}')

NAMES=(" " "Small Single" "Double" "Triple" "Big Single")
[[ $(command -v notify-send) ]] \
  && notify-send "Screen layout: ${NAMES[${SELECTION}]}"

LAYOUT1=("--pos 0x0       " "--off              " "--off")                 # Small Single
LAYOUT2=("--pos 0x1331" "--pos 0x131" "--off")                 # Double
LAYOUT3=("--pos 0x1331" "--pos 0x131" "--pos 1920x0") # Triple
LAYOUT4=("--off                " "--pos 0x131" "--off")                  # Big Single

# Source:
# https://stackoverflow.com/questions/4582137/bash-indirect-array-addressing
declare -n LAYOUT="LAYOUT${SELECTION}"

toggle_monitor() {
  local STATE; STATE=${1}
  local RES; RES=${2}
  [[ "${STATE}" == "--off"* ]] && echo "--off" || echo "--mode ${RES} ${STATE}"
}

xrandr \
  --output ${PRIMARY} $(toggle_monitor "${LAYOUT[0]}" 1920x1080) \
  --output ${SECONDARY} $(toggle_monitor "${LAYOUT[1]}" 1920x1200) \
  --output ${VERTICAL} $(toggle_monitor "${LAYOUT[2]}" 1920x1200) --rotate left

nitrogen --restore 

To be used in i3:

bindsym $mod+$alt+1 --release exec --no-startup-id switch-screenlayout.sh 1
bindsym $mod+$alt+2 --release exec --no-startup-id switch-screenlayout.sh 2
bindsym $mod+$alt+3 --release exec --no-startup-id switch-screenlayout.sh 3
bindsym $mod+$alt+4 --release exec --no-startup-id switch-screenlayout.sh 4