circle for elixir builds

circle.yml

dependencies:
  pre:
    - config/circleci/prepare.sh
  cache_directories:
    - ~/dependencies
    - ~/.mix
    - _build
    - deps

test:
  override:
    - config/circleci/tests.sh

prepare.sh

#!/bin/bash

set -e

export ERLANG_VERSION="18.1"
export ELIXIR_VERSION="v1.2.2"

# If you have a elixir_buildpack.config, do this instead:
#export ERLANG_VERSION=$(cat elixir_buildpack.config | grep erlang_version | tr "=" " " | awk '{ print $2 }')
#export ELIXIR_VERSION=v$(cat elixir_buildpack.config | grep elixir_version | tr "=" " " | awk '{ print $2 }')

export INSTALL_PATH="$HOME/dependencies"

export ERLANG_PATH="$INSTALL_PATH/otp_src_$ERLANG_VERSION"
export ELIXIR_PATH="$INSTALL_PATH/elixir_$ELIXIR_VERSION"

mkdir -p $INSTALL_PATH
cd $INSTALL_PATH

# Install erlang
if [ ! -e $ERLANG_PATH/bin/erl ]; then
  rm -f otp_src_$ERLANG_VERSION.tar.gz
  curl -O -J -L 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

  # Symlink to make it easier to setup PATH to run tests
  ln -sf $ERLANG_PATH $INSTALL_PATH/erlang
fi

# Install elixir
export PATH="$ERLANG_PATH/bin:$PATH"

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
fi
rm -rf $INSTALL_PATH/elixir
# Symlink to make it easier to setup PATH to run tests
ln -sf $ELIXIR_PATH $INSTALL_PATH/elixir

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

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

# Fetch and compile dependencies and application code (and include testing tools)
export MIX_ENV="circle"
cd $HOME/$CIRCLE_PROJECT_REPONAME
mix do deps.get, deps.compile, compile

tests.sh

#!/bin/bash

export MIX_ENV="circle"
export PATH="$HOME/dependencies/erlang/bin:$HOME/dependencies/elixir/bin:$PATH"

elixir -v
mix test