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#!/bin/bash
#
# 1. Downloads, builds and install Golang from source.
#    into $HOME/opt/goXXX where GOROOT is $HOME/opt/go
#    symlink to the current version.
# 2. Install some standard go tools and helpers
# 3. Update $GOPATH built packages with new version of compiler
#

set -e

# 1. Download and extract go source into ~/opt/goXXX
V=${1:-1.4}
GOROOT="${GOROOT:-$HOME/opt/go}"
mkdir -p $(dirname $GOROOT)  # mkdir ~/opt1
cd $(dirname $GOROOT)        # cd ~/opt
mkdir -p go${V}              # mkdir ~/opt/go1.4
ln -sfn $PWD/go${V} $GOROOT  # ln ~/opt/go -> ~/opt/go1.4

# The files in the tar are already in a go/ subdirectory
curl -fsSL https://storage.googleapis.com/golang/go${V}.src.tar.gz | tar zxf -

cd $GOROOT/src

# Build go toolchain for the target we need
for GOOS in darwin linux; do
    for GOARCH in amd64; do
        GOOS=$GOOS GOARCH=$GOARCH ./make.bash --no-clean
    done
done

# 2. Install some standard go tools and helpers
TOOLS=(
golang.org/x/tools/cmd/benchcmp
golang.org/x/tools/cmd/cover
golang.org/x/tools/cmd/eg
golang.org/x/tools/cmd/godex
golang.org/x/tools/cmd/godoc
golang.org/x/tools/cmd/goimports
golang.org/x/tools/cmd/gorename
golang.org/x/tools/cmd/gotype
golang.org/x/tools/cmd/oracle
golang.org/x/tools/cmd/present
golang.org/x/tools/cmd/ssadump
golang.org/x/tools/cmd/vet
golang.org/x/tools/cmd/present
golang.org/x/tools/cmd/stringer
code.google.com/p/rog-go/exp/cmd/godef
github.com/golang/lint/golint
github.com/kisielk/errcheck
github.com/jstemmer/gotags
github.com/nsf/gocode
github.com/tools/godep
github.com/davecheney/gcvis)

export GOPATH="${GOPATH:-$HOME/go}"
export PATH="$GOROOT/bin:$GOPATH/bin:$PATH"
for url in ${TOOLS[@]}; do
        echo go get $url && go get -u $url
done

# 3. Update $GOPATH built packages with new version of compiler
# go get -u all