goenv.sh

#!/bin/bash

# Apparently this doesn't work. :((((((((((((
_path_remove ()  { export PATH=`echo -n $PATH | awk -v RS=: -v ORS=: '$0 != "'$1'"' | sed 's/:$//'`; }

goenv() {
  new_env=${1:-`pwd`}
  old_env=$GOPATH
  
  if [[ -z $old_env ]]; then
    _path_remove $old_env/bin
  fi
  
  export GOPATH=$new_env
  export PATH="$PATH:$new_env/bin"
}

goenv.zsh

# This works happily.
function goenv() {
  case $1 in
    "list")
      echo "-> gopath=$GOPATH"
    ;;
    *)
      _set_goenv $@ 
    ;;
  esac
}

function _set_goenv() {
  new_env=$1
  old_env=$GOPATH
  
  if [[ -n $old_env ]]; then
    old_bin_path=${old_env}/bin
    path=(${path#$old_bin_path})
  fi

  if [[ -z $new_env ]]; then
    new_env=$(pwd)
  fi

  path+=($new_env/bin)
  GOPATH=$new_env
}