focus-switch.sh

#!/usr/bin/env bash

function is_browser {
    local path=$1
    local basename=$(basename $path)
    
    if [[ $basename = "chromium-browser" ]]; then
        return 1
    fi

    return 0
}

browser=0

while true; do
    filename=$(inotifywait -qre modify -e create -e move -e delete --format %f .)

    printf "%s changed, awaiting switch to browser" $filename
    echo ""

    while [[ $browser = "0" ]]; do
        current_process=$(ps -p $(xprop -id $(xprop -root _NET_ACTIVE_WINDOW | awk '{print $5}') _NET_WM_PID | awk '{print $3}') -o command= | awk '{print $1}')

        is_browser $current_process

        if [[ $? -eq 1 ]]; then
            if [[ $browser = "0" ]]; then
                browser=1
                echo "Switched to browser..."
                # Execute program here...
                echo "Done."
            fi
        fi

        sleep 1
    done
    
    browser=0
done