#!/bin/sh
set -eu

version_go=1.13

dir_download="$PWD/download"
mkdir -p build; cd build
dir_install="$PWD/install-go"

# Prepare source
mkdir -p "go$version_go"
tar xf "$dir_download/go$version_go.src.tar.gz" -C "go$version_go" --strip-components 1
cd "go$version_go"

# Build and install
(cd src; GOROOT_BOOTSTRAP="$PWD/../../install-bootstrap" ./make.bash)
rm -rf pkg/obj src/cmd src/builtin
find src -type f \( ! -name "*.go" -a ! -name "*.s" -a ! -name "*.h" \) -delete
find src -type f \( -name "*_test.go" -o -name "*_test_*.go" \) -delete
find src -type d -name "testdata" -exec rm -r {} +
find src -type d -empty -delete
mkdir -p "$dir_install"
cp -at "$dir_install" bin pkg src