autoscroll

#!/bin/bash
# Autoscroll (Full)

enableverticalscroll=1
enablehorizontalscroll=1
enableclickscroll=0
clickdelay=0.2 #The grace period for you to release the middle mouse button to activate clickscrolling before it assumes you're holding it down (in seconds), it is inadvisable to set this setting much higher than this.
paddingtop=50 #The closest the cursor can go (in pixels) to the top of your screen before being stopped. May need to be optimized based on your screen resolution.
paddingbot=40 #The closest your cursor can go (in pixels) to the bottom of before being stopped. May need to be optimized based on your screen resolution.

middlemousebutton=2
mousescrollup=4
mousescrolldown=5
mousescrollleft=6
mousescrollright=7

## Danger below :D

filename=`basename "$0"` #Required for autoscroll
echo -n | xsel -n -i
eval $(xdotool getmouselocation --shell)
starty=$Y
startx=$X
toggle=$middlemousebutton
firstloop=1

#A horrible hack to find the device ID of your mouse and screen height which are required to create the workaround to prevent accidental tab and toolbar scrolling.
devcount=$(xinput | sed '/keyboard/d' | sed '/Virtual/d'| wc -l)
for i in $(seq 1 $devcount)
do
    mouseid=$(xinput | sed '/keyboard/d' | sed '/Virtual/d'|cut -d '=' -f2 | cut -d '[' -f1 | head -n $i | tail -1)
    buffer=$(xinput --list $mouseid | grep -i -m 1 "Button state:" | grep -o "[$middlemousebutton]\+")
    if [ "$buffer" = "$middlemousebutton" ]
    then
        break
    fi
done
screenheight=$(( $(xrandr | grep '*' | awk '{ print $1 }' | cut -d 'x' -f2) - $paddingbot ))

if [ "$(pidof -x $filename | wc -w)" -gt "2" ]
then
    xinput set-prop $mouseid "Coordinate Transformation Matrix" 1 0 0 0 1 0 0 0 1
    pkill autoscroll #Disables autoscrolling on second click when clickscrolling is enabled.
fi


while [ "$toggle" = "$middlemousebutton" ]
do
    eval $(xdotool getmouselocation --shell)
    curry=$Y
    currx=$X
    if [ $curry -lt $paddingtop ] #Prevent accidental browsertab scroll
    then
    xinput set-prop $mouseid "Coordinate Transformation Matrix" 0 0 0 0 0 0 0 0 100000
    xdotool mousemove_relative 0 $paddingtop
    elif [ $curry -gt $screenheight ] #Prevent accidental taskbar scroll
    then
    xinput set-prop $mouseid "Coordinate Transformation Matrix" 0 0 0 0 0 0 0 0 100000
    xdotool mousemove_relative 0 -$paddingbot
    fi
    if [ $enableverticalscroll -eq 1 ]
    then
        if [ $curry -gt $starty ]
        then
            speedy=$(expr $curry / 100 - $starty / 100)
            if [ $speedy -gt 0 ]
            then
                xdotool click --repeat $speedy --delay 1 $mousescrolldown
            fi
        else
            speedy=$(expr $curry / 100  - $starty / 100  | sed 's:-::')
            if [ $speedy -gt 0 ]
            then
                xdotool click --repeat $speedy --delay 1 $mousescrollup
            fi
        fi
    fi

    if [ $enablehorizontalscroll -eq 1 ]
    then
        if [ $currx -gt $startx ]
        then
            speedx=$(expr $currx / 100 - $startx / 100)
            if [ $speedx -gt 0 ]
            then
                xdotool click --repeat $speedx --delay 1 $mousescrollright
            fi
        else
            speedx=$(expr $currx / 100  - $startx / 100  | sed 's:-::')
            if [ $speedx -gt 0 ]
            then
                xdotool click --repeat $speedx --delay 1 $mousescrollleft
            fi
        fi
    fi
    if [ $firstloop = 1 ]
    then
        sleep $clickdelay
        firstloop=0
    fi
    if [ $enableclickscroll -eq 1 ] && [ -z $(xinput --list "Virtual core pointer" | grep -i -m 1 "Button state:" | grep -o "[$middlemousebutton]\+") ]
    then
        if [ $(xinput --query-state $mouseid | grep 'button\[' | sort | grep -c down) -gt 0 ] #Enables mouse buttons other than middle mouse to stop clickscrolls.
        then
            xinput set-prop $mouseid "Coordinate Transformation Matrix" 1 0 0 0 1 0 0 0 1
            exit
        fi
    else
        enableclickscroll=0
        toggle=$(xinput --list "Virtual core pointer" | grep -i -m 1 "Button state:" | grep -o "[$middlemousebutton]\+")
    fi
    sleep 0.02
done
xinput set-prop $mouseid "Coordinate Transformation Matrix" 1 0 0 0 1 0 0 0 1