#!/bin/bash

#-----------
# VARIABLES
#-----------

ERLANG_VERSION=${ERLANG_VERSION-23.2-1}
ELIXIR_VERSION=${ELIXIR_VERSION-1.11.4}
LINUX_DISTRIBUTION=${LINUX_DISTRIBUTION-$(lsb_release -cs)}

#-----------
# HELPERS
#-----------

set_env()
{
  KEY=$1
  VAL=$2
  echo "export $KEY=$VAL" >> $HOME/.bash_aliases
}

#-----------
# INSTALLER
#-----------

if [ "$(which brew)" == "" ]; then
  ERLANG_VERSION=${ERLANG_VERSION} LINUX_DISTRIBUTION=${LINUX_DISTRIBUTION} bits install-if erlang
  INSTALL_DIR=${INSTALL_DIR-/opt}

  locale-gen en_US.UTF-8
  set_env ELIXIR_VERSION $ELIXIR_VERSION
  source $HOME/.bash_aliases

  set_env LC_ALL en_US.UTF-8
  set_env LANG en_US.UTF-8
  set_env LANGUAGE en_US.UTF-8
  set_env PATH "${INSTALL_DIR}/elixir/elixir-$ELIXIR_VERSION/bin:node_modules/.bin:\$PATH"
  source $HOME/.bash_aliases

  bits install inotify # for watching file changes
  SWAP_SIZE=8G bits install swap # installs 8G of swap space

  mkdir -p ${INSTALL_DIR}/elixir && cd ${INSTALL_DIR}/elixir
  wget https://github.com/elixir-lang/elixir/archive/v$ELIXIR_VERSION.tar.gz
  tar zxf v$ELIXIR_VERSION.tar.gz
  cd ${INSTALL_DIR}/elixir/elixir-$ELIXIR_VERSION
  make clean
  make install
else
  ERLANG_VERSION=$ERLANG_VERSION LINUX_DISTRIBUTION=${LINUX_DISTRIBUTION} bits install-if erlang
  brew install elixir
fi