attract/gulp

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#!/bin/bash -ex
GULP=./node_modules/.bin/gulp
function install() {
npm install
touch $GULP # installer doesn't always touch this after a build, so we do.
}
# Rebuild Gulp if missing or outdated.
[ -e $GULP ] || install
[ gulpfile.js -nt $GULP ] && install
if [ "$1" == "watch" ]; then
# Treat "gulp watch" as "gulp && gulp watch"
$GULP
fi
exec $GULP "$@"