virtualenv for golang

goenv.sh

#!/usr/bin/env bash
mkdir $1
echo '# This file must be used with "source activate" or ". activate"
function deactivate() {
  if [ -n "$GOENVNAME" ]; then
    unset GOENVNAME
  fi
  if [ -n "$_OLD_GOROOT" ]; then
    export GOROOT="$_OLD_GOROOT"
    unset _OLD_GOROOT
  fi
  if [ -n "$_OLD_PS1" ]; then
    export PS1="$_OLD_PS1"
    unset _OLD_PS1
  fi
  if [ -n "$_OLD_PATH" ]; then
    export PATH="$_OLD_PATH"
    unset _OLD_PATH
  fi
  if [ -n "$_OLD_GOPATH" ]; then
    export GOPATH="$_OLD_GOPATH"
    export GOBIN="$_OLD_GOPATH"/bin
    unset _OLD_GOPATH
  fi
  if [ "$1" != "init" ]; then
    unset -f deactivate
  fi
}
deactivate init
export _OLD_PATH="$PATH"
export _OLD_GOPATH="$GOPATH"
export _OLD_GOROOT="$GOROOT"
export _OLD_PS1="$PS1"
export GOENVNAME='$1'
export PS1="(go:$GOENVNAME) $_OLD_PS1"
export GOPATH=$(pwd)/$GOENVNAME
export GOBIN=$GOPATH/bin
export PATH="$GOBIN":$PATH' > $1/activate2