Mac fswatch file change propagation daemon

fsync.sh

#!/bin/bash

code=0
if [[ ! "$1" ]] || [[ "$1" && ! -d "$1" && "-h" != "$1" && "--help" != "$1" ]] || [[ "$2" && ! -d "$2" ]] ; then
    code=1
fi

if [[ ! "$2" || $code -gt 0 || "-h" = "$1" || "--help" = "$1" ]] ; then
    echo Propagates file changes from one directory into another
    echo usage:
    echo "  $0 <source_dir> <dest_dir>"
    exit $code
fi

if [[ "$3" ]] ; then
    TARG=`php -r "echo(substr('$3',1+strlen(realpath('$1'))));"`
    DIR=`php -r "echo(dirname('$TARG'));"`
    if [[ ! -f $1/$TARG ]] ; then
        [[ ! -f "$2/$TARG" ]] && exit
        echo -- $2/$TARG
        rm -f "$2/$TARG"
        exit
    fi
    if [[ ! -d $2/$DIR ]] ; then
        echo +d $2/$DIR
        mkdir -p "$2/$DIR"
    fi
    if [[ ! -f $2/$TARG ]] ; then
        echo ++ $2/$TARG
    else
        echo ~~ $2/$TARG
    fi
    cp "$1/$TARG" "$2/$TARG"
    exit
fi

echo propragating changes from $1 into $2...

fswatch $1 | xargs -n1 $0 $1 $2