#!/bin/bash
# Copyright 2012 The Go Authors.  All rights reserved.
# Use of this source code is governed by a BSD-style
# license that can be found in the LICENSE file.

# Run this script in your app root directory, the one containing
# the app.yaml file.  Then point appcfg.py or dev_appserver.py
# at './tmp' instead of '.'.
#
# It creates a symlink forest in a subdirectory named 'tmp' that
# includes all the files from packages under your app root as
# well as any packages from your $GOPATH that are needed by
# the app packages.  This makes deployment to App Engine
# bring in just the packages you need, without manual chasing
# of dependencies.  Perhaps some day appcfg.py and dev_appserver.py
# will work this way by default.

set -e
rm -rf tmp
dirs=$(find . -type d)
mkdir tmp

for i in *
do
	case "$i" in
	tmp | *.go)
		;;
	*)
		ln -s ../$i tmp/$i
	esac
done

# Like App Engine
export GOOS=linux
export GOARCH=amd64

mkdir tmp/_go_top
cp $(go list -f '{{range .GoFiles}}{{.}} {{end}}') tmp/_go_top

dirs=$(go list -e -f '{{if not .Standard}}{{.ImportPath}} {{end}}' $(go list -f '{{range .Deps}}{{.}} {{end}}' $dirs))
for import in $dirs
do
	case "$import" in
	appengine | appengine/*)
		;;
	*)
		mkdir -p tmp/$import
		files=$(go list -f '{{range .GoFiles}}{{$.Dir}}/{{.}} {{end}}' $import)
		ln -s $files tmp/$import 2>&1 | grep -v 'is a directory' || true  # ignore subdirectory warnings
	esac
done