#!/bin/bash
# Install Erlang 19.1 & Elixir 1.3.4 on Ubuntu box (tested on 14.04)
#
# sudo apt-get update
# sudo apt-get -y install build-essential libncurses5-dev openssl libssl-dev fop xsltproc unixodbc-dev

set -e

export ERLANG_VERSION="19.1"
export ELIXIR_VERSION="v1.3.4"

export ERLENV_PATH="$HOME/.erlenv"
export ERLANG_PATH="$ERLENV_PATH/otp_src_$ERLANG_VERSION"
export ELIXIR_PATH="$ERLENV_PATH/elixir_$ELIXIR_VERSION"

mkdir -p $ERLENV_PATH
cd $ERLENV_PATH

# Install erlang
if [ ! -e $ERLANG_PATH/bin/erl ]; then
  curl -OL http://www.erlang.org/download/otp_src_$ERLANG_VERSION.tar.gz
  tar xzf otp_src_$ERLANG_VERSION.tar.gz
  cd $ERLANG_PATH
  ./configure --enable-smp-support \
              --enable-m64-build \
              --disable-native-libs \
              --disable-sctp \
              --enable-threads \
              --enable-kernel-poll \
              --disable-hipe \
              --without-javac
  make

  ln -sf $ERLANG_PATH $ERLENV_PATH/erlang
fi

export PATH="$ERLANG_PATH/bin:$PATH"

# Install elixir
if [ ! -e $ELIXIR_PATH/bin/elixir ]; then
  git clone https://github.com/elixir-lang/elixir $ELIXIR_PATH
  cd $ELIXIR_PATH
  git checkout $ELIXIR_VERSION
  make

  ln -sf $ELIXIR_PATH $ERLENV_PATH/elixir
fi

export PATH="$ERLANG_PATH/bin:$ELIXIR_PATH/bin:$PATH"

# Install package tools
if [ ! -e $HOME/.mix/rebar ]; then
  LC_ALL=en_GB.UTF-8 mix local.hex --force
  LC_ALL=en_GB.UTF-8 mix local.rebar --force
fi

exit 0