Watches packages' directories for changes and executes a command when detecting a change.

watchpackages.sh

#!/bin/sh
#
# Requires inotify-tools to be installed.

usage(){
	echo "Watches packages' directories for changes and executes"
	echo 'a command when detecting a change.'
	echo
	echo 'This script requires inotify-tools to be installed.'
	echo
	echo "Usage: $0 <command> <packages...>"
	echo
	echo 'arguments:'
	echo '  <command>  The command to execute when detecting a change.'
	echo '  <packages> Packages (registered to ~/.package.yml) to'
	echo '             watch.'
	echo
	echo 'example:'
	echo "  $0 'packager build More/* > more.js' Core More"
}

if [ "$1" == '-h' -o "$1" == '--help' -o -z "$1" ]; then
	usage
	exit
fi

getpackagedirs(){
	for PACKAGE in "$@"; do
		PKG=`sed -n "/^$PACKAGE:/ { s/^$PACKAGE://; />$/n; s/^ \+//; p }" ~/.packages.yml`
		if [ -f "$PKG" ]; then
			PKG=`dirname "$PKG"`
		fi
		if [ -d "$PKG" ]; then
			echo "$PKG"
		fi
	done
}

COMMAND=$1

shift

DIRS=`getpackagedirs "$@"`

echo -e "Watching directories:\n$DIRS\nPress ctrl-c to stop." >&2

while true; do
	inotifywait -r --exclude '.*(\.sw\w+|~)$' -e close_write -e move -e create -e delete $DIRS >&2 2> /dev/null
	sh -c "$COMMAND"
done