Generic test watcher / hot reload function for zsh and bash shells (depends on inotify-tools).

shell-watcher.sh

alias watch="run_on_change"; run_on_change() {
    color_command(){
        # Modify these values to change behavior
        pass_terms="pass|ok"
        fail_terms="fail|failed"
        pass_color=$'\e[1;32m'
        fail_color=$'\e[1;31m'
        reset_color=$'\e[0m'

        colored_pass_terms="✅ ${pass_color}&${reset_color}"
        colored_fail_terms="❌ ${fail_color}&${reset_color}"

        # Use sed to parse output and color it
        "$@" | sed \
            -Ee "s/${pass_terms}/${colored_pass_terms}/I" \
            -Ee "s/${fail_terms}/${colored_fail_terms}/I"
    }

    # Run command once
    color_command "$@"
    # Loop and use inotify-tools to re-run on change
    while true; do
        inotifywait -qq -r -e create,modify,move,delete ./ &&
        printf "\n[ . . . Re-running command . . . ]\n" &&
        color_command "$@"
    done
}