#!/bin/bash
set -o errexit -o pipefail

[[ "$GOROOT" ]]  ||  export GOROOT="$HOME/golang"
[[ "$GOPATH" ]]  ||  export GOPATH="$HOME/go"
PKG_VER="1.4.2"

gimme \
	curl \
	git \
	mercurial

#TODO: might eventually make these two more similar
if ! has go; then
	if [[ "$OS" = "Darwin" ]]; then

		GOROOT="" gimme_pkg go --with-cc-common

	else

		if ! [[ -d "$GOROOT" ]]; then
			PKG_URL="https://storage.googleapis.com/golang/go${PKG_VER}.linux-amd64.tar.gz"
			mkdir -p "$GOROOT.$PKG_VER"
			curl -k -fsSL "$PKG_URL" | tar -xz -C "$GOROOT.$PKG_VER"
			mv -v "$GOROOT.$PKG_VER/go" "$GOROOT"
			rm -fr "$GOROOT.$PKG_VER"
		else
			echo "# FAIL: Unable to install 'go' to the GOROOT=$GOROOT directory because it already exists."
			exit 123
		fi

	fi

fi