dotfiles/scswitch at master · adamsinger/dotfiles · GitHub

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#!/bin/bash

TITLE="Scala Switch Script\n-------------------\nhttps://github.com/lieldulev/brew-scala-switcher"
DISCLAMER="\nDISCLAMER: This script assumes you've installed scala versions using brew install scala/scala210/scala29."
HELP="Usage: scswitch [VERSION]\n\nVERSION - Supports versions 2.9.*, 2.10.* and 2.11.*\n\nInstalled Versions:\n"
SWITCHING="Switchd to: "
NOT_FOUND="Version %s not found.\n"
VERSION=$1


function list_versions () {
  list_211
  list_210
  list_29
}

function list_ver {
  local main_scala_version="$1"
  local compare="$2"
  IFS='.' read -a array <<< "$main_scala_version"
  if [ "${array[1]}" = "$compare" ]; then
    printf "${array[0]}.${array[1]}.${array[2]} - Type 'scswitch 2.$compare' to switch to this version.\n"
  fi
}

function list_211 () {
  local ls_res=`ls /usr/local/Cellar/scala/ 2>/dev/null`
  list_ver "${ls_res#\n}" "11"
}

function list_210 () {
  local ls_res=`ls /usr/local/Cellar/scala210/ 2>/dev/null`
  list_ver "${ls_res#\n}" "10"
}

function list_29 () {
  local ls_res=`ls /usr/local/Cellar/scala29/ 2>/dev/null`
  list_ver "${ls_res#\n}" "9"
}

function switch_to {
  local base_path="$1"
  rm "/usr/local/bin/scala"
  rm "/usr/local/bin/scalac"
  rm "/usr/local/bin/scaladoc"
  rm "/usr/local/bin/scalap"
  ln -s "$base_path/bin/scala" "/usr/local/bin/scala"
  ln -s "$base_path/bin/scalac" "/usr/local/bin/scalac"
  ln -s "$base_path/bin/scaladoc" "/usr/local/bin/scaladoc"
  ln -s "$base_path/bin/scalap" "/usr/local/bin/scalap"
  printf "$SWITCHING $base_path\n"
}

function switchto_x {
  local clean="$1"
  if [ "$clean" != "" ]; then
    switch_to "/usr/local/Cellar/$2/$clean"
  else
    printf "$NOT_FOUND\n" "$3"
  fi

}

function switchto_211 {
  local ls_res=`ls /usr/local/Cellar/scala/ 2>/dev/null`
  switchto_x "${ls_res#\n}" "scala" "2.11"
}
function switchto_210 {
  local ls_res=`ls /usr/local/Cellar/scala210/ 2>/dev/null`
  switchto_x "${ls_res#\n}" "scala210" "2.10"
}

function switchto_29 {
  local ls_res=`ls /usr/local/Cellar/scala29/ 2>/dev/null`
  switchto_x "${ls_res#\n}" "scala29" "2.9"
}

# EXCEUTING STARTS HERE:

# Help / List
if [ "$VERSION" = "" ]; then
    printf "\n$TITLE\n"
    printf "\n$HELP\n"
    list_versions
    printf "$DISCLAMER\n"
else # Switch
  if [ "$VERSION" = "2.11" ]; then
    switchto_211
  elif [ "$VERSION" = "2.10" ]; then
    switchto_210
  elif [ "$VERSION" = "2.9" ]; then
    switchto_29
  else
    echo "Unknown version."
  fi
fi