all-pixels.sh

#!/bin/bash

declare -i SCREEN_WIDTH_POSITION=7
declare -i SCREEN_HEIGHT_POSITION=9
declare -i MINIMUM_SCREEN_WIDTH=1
declare -i MAXIMUM_SCREEN_WIDTH=3840
declare -i MINIMUM_SCREEN_HEIGHT=1
declare -i MAXIMUM_SCREEN_HEIGHT=2160
declare -i MOUSE_DELAY=100
declare -i numberOfXArguments=
declare -i screenHeight=
declare -i screenWidth=
declare -i heightIndex=
declare -i widthIndex=
declare -i userReplied=0
declare -i noWidth=0
declare -i noHeight=0
declare screenHeightRaw=
declare userEnteredWidth=
declare userEnteredHeight=

regEx='^[0-9]+$'

trap 'echo "Caught signal, exiting"; exit 0' 1 2 3 18
trap 'echo "Thanks! See you later!";' EXIT

echo "Hello! Press CTRL+C at any point to quit"

returnString=$(xrandr | grep current)
read -r -a argumentArray <<< "$returnString"
declare -i numberOfXArguments=$((${#argumentArray[*]}))

if [[ $((numberOfXArguments)) -eq 0 ]]; then
    echo "Something went wrong with xrandr, exiting."
    exit 1
fi

screenHeightRaw=${argumentArray[ $((SCREEN_HEIGHT_POSITION)) ]}
screenWidth=$(( ${argumentArray[ $((SCREEN_WIDTH_POSITION)) ]} ))
screenHeight=$(( ${screenHeightRaw:0:${#screenHeightRaw}-1} ))

echo "Your current resolution is $((screenWidth))x$((screenHeight))"
while [[ $userReplied -eq 0 ]]; do
    read -p "Is this correct? [Y/n]" userReply
    case $userReply in
        y|Y) echo "Great. Here we go! (Press CTRL+C at any time to quit)"; userReplied=1 ;;
        "") continue ;;
        *) noWidth=1; noHeight=1; userReplied=1 ;;
    esac
done

if [[ $((noWidth)) -eq 1 ]]; then
    screenWidth=0
    while [[ $((screenWidth)) -eq 0 ]]; do
        read -p "Enter your screen width in pixels: " userEnteredWidth
        if ! [[ $userEnteredWidth =~ $regEx ]]; then
           echo "Error: $userEnteredWidth is not a number"
        elif [[ $((userEnteredWidth)) -lt $((MINIMUM_SCREEN_WIDTH)) ]]; then
            echo "Error: $((userEnteredWidth)) is smaller than the minimum screen width of ($((MINIMUM_SCREEN_WIDTH))) pixels"
        elif [[ $((userEnteredWidth)) -ge $((MAXIMUM_SCREEN_WIDTH)) ]]; then
            echo "Error: $((userEnteredWidth)) is larger than the maximum screen width of ($((MAXIMUM_SCREEN_WIDTH))) pixels"
        else
            screenWidth=$((userEnteredWidth))
        fi
    done 
fi

if [[ $((noHeight)) -eq 1 ]]; then
    screenHeight=0
    while [[ $((screenHeight)) -eq 0 ]]; do
        read -p "Enter your screen height in pixels: " userEnteredHeight
        if ! [[ $userEnteredHeight =~ $regEx ]]; then
            echo "Error: $userEnteredHeight is not a number"
        elif [[ $((userEnteredHeight)) -lt $((MINIMUM_SCREEN_HEIGHT)) ]]; then
            echo "Error: $((userEnteredHeight)) is smaller than the minimum screen height of ($((MINIMUM_SCREEN_HEIGHT))) pixels"
        elif [[ $((userEnteredHeight)) -ge $((MAXIMUM_SCREEN_HEIGHT)) ]]; then
            echo "Error: $((userEnteredHeight)) is larger than the maximum screen height ($((MAXIMUM_SCREEN_HEIGHT))) pixels"
        else
            screenHeight=$((userEnteredHeight))
        fi
    done
fi

while(true); do
    for ((heightIndex = 0; heightIndex < screenHeight; heightIndex++)); do
        for ((widthIndex = 0; widthIndex < screenWidth; widthIndex++)); do
            xdotool mousemove $((widthIndex)) $((heightIndex))
            echo -ne "currentPixel: ($((widthIndex)),$((heightIndex)))\r"
        done
        echo -ne "\r\033[K\r"
    done
done