Switch between two different installations of Go

goswitch

#!/bin/sh

#
# Switch between two different installations of Go:
# 
#  source goswitch dev
#  ^ makes GOROOT ~/Sources/go
#
#  source goswitch prod
#  ^ makes GOROOT ~/go
#
#  source goswitch
#  ^ sets whatever the last version was
#

VERSION_FILE=$HOME/.goversion

function set_environment {
	export GOOS=darwin
	export GOARCH=amd64
	export GOROOT=$1
	export PATH=$1/bin:$PATH
	echo "GOROOT is now $1"
}

function set_version {
	case $1 in
	dev ) 
		GOPATH="$HOME/Sources/go"
		;;
	prod ) 
		GOPATH="$HOME/go"
		;;

	* )
		return 1
	esac
	set_environment "$GOPATH"
	echo "** Switched to $1 version **"
	echo "$1" > $VERSION_FILE
	return 0
}

set_version $1
if [ $? -eq "1" ]; then
	if [ -e $VERSION_FILE ]; then
		set_version $(cat $VERSION_FILE)
	fi
fi