#!/bin/bash
# Description: The Erlang programming language
set -e

PREFIX=${HOME}/.local

__OTP_VERSION=25.2
__OTP_PATH=${PREFIX}/lib/otp

_recipe _path

function _kerl_build {
    local version=$1
    if ! kerl list builds | grep -q "^${version},${version}\$"; then
        _run "[kerl] Building OTP ${version}" kerl build "${version}"
    else
        echo "[kerl] OTP ${version} is already built, skipping."
    fi
}

function _kerl_install {
    local version=$1
    _kerl_build $1
    if ! kerl list installations | grep -q "^${version} "; then
        mkdir -p "${__OTP_PATH}"
        _run "[kerl] Installing OTP ${version}" kerl install "${version}" "${__OTP_PATH}/${version}"
    else
        echo "[kerl] OTP ${version} is already installed, skipping."
    fi
}

mkdir -p ${PREFIX}/bin

_run "[erlang] Download kerl" \
    curl https://raw.githubusercontent.com/kerl/kerl/master/kerl \
    -o ${PREFIX}/bin/kerl \
    && chmod +x ${PREFIX}/bin/kerl

_run "[erlang] Download rebar3" \
    curl https://s3.amazonaws.com/rebar3/rebar3 \
    -o ${PREFIX}/bin/rebar3 \
    && chmod +x ${PREFIX}/bin/rebar3
_run "Add ${PREFIX}/bin to PATH" _path_high ${PREFIX}/bin

_kerl_install $__OTP_VERSION
_profile "source ${__OTP_PATH}/${__OTP_VERSION}/activate"