Brainfuck to Ruby/C++ CLI

require 'optparse'
require 'colorize'

opt = {}
OptionParser.new do |opts|
  opts.banner = "Usage: example.rb [options]"

  opts.on("-c", "--compile FILE", "Specify input file [else from STDIN]") do |v|
    opt[:input] = v
  end
  opts.on("-o", "--output FILE", "Specify output file [else from STDOUT]") do |v|
    opt[:output] = v
  end
  opts.on("-t", "--type TYPE", "Specify output file type [ruby, cxx supported]") do |v|
    opt[:type] = v
  end
  opts.on("-?", "--help", "This help") do
    puts opts
    exit 0
  end
end.parse!

code = nil

if opt[:input]
    code = IO.read opt[:input]
else
    code = $stdin.read
end

unless opt[:type] == 'cxx' or opt[:type] == 'ruby'
    puts "#" + "HALT Wrong type, using Ruby".colorize(:background => :red).colorize(:white)
    opt[:type] = 'ruby'
end

rubyc = "\tbuf = [ ]\n\ti = 0\n\tbuf[0] = 0; "
cppc = "#include <bits/stdc++.h>\nusing namespace std; int main() { vector < long long > buf; buf.resize(1000000); size_t i = 0; char timex; "

code.split('').each { |ch|
    if ch == '>'
        rubyc += "i += 1; unless buf[i]; buf[i] = 0; end; "
        cppc += "i++; "
    end
    if ch == '<'
        rubyc += "i -= 1; unless buf[i]; buf[i] = 0; end; "
        cppc += "i--; "
    end
    if ch == '+'
        rubyc += "buf[i] += 1; "
        cppc += "buf[i]++; "
    end
    if ch == '-'
        rubyc += "buf[i] -= 1; "
        cppc += "buf[i]--; "
    end
    if ch == '.'
        rubyc += "print buf[i].chr; "
        cppc += "cout << (char)buf[i]; "
    end
    if ch == ','
        rubyc += "buf[i] = getc ; "
        cppc += "cin >> timex; buf[i] = timex; "
    end
    if ch == '['
        rubyc += "while buf[i] != 0; "
        cppc += "while(buf[i]) { "
    end
    if ch == ']'
        rubyc += "end; "
        cppc += "} "
    end
}

cppc += "}"
rescode = (opt[:type] == 'cxx' ? cppc : rubyc)

if opt[:output]
    IO.write opt[:output], rescode
else
    puts rescode
end