#!/usr/bin/env sh

set -o errexit -o nounset

DIR=/tmp/getch-master
PATH=${PATH}:/tmp/ruby/bin

# last snapshot https://www.ruby-lang.org/en/downloads/
compile_ruby() {
  PN=ruby
  PV=2.7
  [ -f /tmp/$PN_$PV.tar.gz ] || curl -s -L -o /tmp/$PN_$PV.tar.gz https://cache.ruby-lang.org/pub/ruby/snapshot/snapshot-$PN_$PV.tar.gz
  [ -d /tmp/snapshot-$PN_$PV ] || {
    cd /tmp
    tar xvf $PN_$PV.tar.gz
  }
  cd snapshot-$PN_$PV
  ./configure --prefix=/tmp/$PN
  make
  make install
}

search_ruby() {
  if hash ruby 2>/dev/null ; then
    echo "Ruby $(ruby -v | awk '{print $2}') found"
  else
    echo "Install ruby"
    if hash pacman 2>/dev/null ; then
      pacman -Syy
      pacman -S --needed ruby
    elif hash emerge 2>/dev/null ; then
      emerge -av dev-lang/ruby
    elif hash apt-get 2>/dev/null ; then
      apt-get install ruby
    else
      compile_ruby
    fi
  fi
}

get_getch() {
  cd /tmp
  [ -f ./getch.tar.gz ] && rm ./getch.tar.gz
  [ -d ./getch-master ] && rm -rf ./getch-master

  curl -s -L -o getch.tar.gz https://github.com/szorfein/getch/archive/master.tar.gz
  tar xzf getch.tar.gz
}

main() {
  get_getch
  search_ruby
  cd $DIR \
    && ruby -I lib bin/getch
}

main "$@"