Watches for changes in JavaScript and Sass-folders

watch

#!/bin/sh

JS_PATH="_js"
FINAL_JS="scripts.js"

SASS_PATH="_sass"
FINAL_CSS="."

sha=0
previous_sha=0

update_sha()
{
    sha=`ls -lRT $JS_PATH $SASS_PATH | gsha1sum`
}

build () {
    # Build/make commands here
    rm $FINAL_JS
    touch $FINAL_JS
    cat $JS_PATH/*.js >> $FINAL_JS
    echo "  \033[0;32m$FINAL_JS\033[0m"
    sass --update $SASS_PATH:$FINAL_CSS
}

changed () {
    echo " ≫ Change detected. Rebuilding..."
    build
    previous_sha=$sha
}

compare () {
    update_sha
    if [[ $sha != $previous_sha ]] ; then changed; fi
}

run () {
    update_sha
    previous_sha=$sha
    while true; do

        compare

        read -s -t 1 && (
            echo " ≫ Forced rebuild..."
            build
        )

    done
}

echo " ≫ Watching for changes. Press Ctrl-C to stop. Press enter to force rebuild."

run