watch-node

#!/bin/bash

trap     ctrl_c INT TERM KILL
function ctrl_c () { kill -KILL $pid $$; }

path=$@
watchfolder=$(dirname $1)
command="node $path"

# echo
# echo if you want to understand what this script is doing, un-comment the line below.
# echo [watch-node $$] running $command and daemonizing, watching folder $watchfolder every 2 secs.
# echo

$command &
pid=$!
while [[ true ]]; do

    if [[ `uname` == "Darwin" ]]; then
      files=`find -L $watchfolder -type f -mtime -2s | grep -v "\.test\." | grep -v "models\.json"`
    else
      files=`find -L $watchfolder -type f -mmin $(echo 2/60 | bc -l) | grep -v "\.test\." | grep -v "models\.json"`
    fi

    if [[ $files != "" ]]
    then
        echo [watch-node $$] files changed [$files] killing $pid $command
        kill -KILL $pid > /dev/null
        echo [watch-node $$] new pid is $pid
    fi
    if ! ( ps -p $pid > /dev/null ); then
        $command &
        pid=$!
        echo "[watch-node $$] process (re)started new pid $pid cmd: $command"
    fi
    sleep 2
done