#!/bin/bash

set -e
set -x
set -o pipefail

ELIXIR_VERSION=$1

if test -z "$ELIXIR_VERSION"
then
  echo "Cannot proceed without Elixir version!" >> /dev/stderr
  exit 1
else
  echo "Elixir: $ELIXIR_VERSION"
fi

# Download and install Elixir
ELIXIR_DOWNLOAD_URL="https://github.com/elixir-lang/elixir/archive/v${ELIXIR_VERSION}.tar.gz"
ELIXIR_ARCHIVE="elixir-${ELIXIR_VERSION}.tar.gz"
wget -q -O $ELIXIR_ARCHIVE "$ELIXIR_DOWNLOAD_URL"
grep $ELIXIR_ARCHIVE shasums | sha256sum -c -
ELIXIR_TOP="/usr/local/src/elixir-${ELIXIR_VERSION}"
mkdir -p $ELIXIR_TOP
tar -xzC $ELIXIR_TOP --strip-components=1 -f $ELIXIR_ARCHIVE
rm $ELIXIR_ARCHIVE
( cd $ELIXIR_TOP && make install clean )
rm -rf $ELIXIR_TOP