notruby

#!/usr/bin/env ruby -s
# NotRuby interpreter
$:.unshift File.expand_path('..', __FILE__)

require 'interpreter'
require 'readline'
require 'pp'
require 'readline_history'

if $h # -h option
  abort <<USAGE
Usage:

  ./notruby # start REPL
  ./notruby file.rb
  ./notruby -e='code'

USAGE
end

# Eval some code
# $e = # -e option
if $e
  Interpreter.new.eval($e)
elsif ARGV.first
  Interpreter.new.eval(File.read(ARGV.first))
# Start the REPL, read-eval-print-loop, or interactive interpreter
else
  ReadlineHistory::load_history

  puts "NotRuby REPL, 'quit' to quit"
  
  interpreter = Interpreter.new

  loop do
    begin
      line = Readline.readline(">> ") 
    rescue Interrupt    # CTRL-C aborts only the current line being read. Should use 'quit' to quit the REPL.
      next
    end

    next if line.empty?
    
    Readline::HISTORY.push(line) unless Readline::HISTORY.to_a[-1] == line

    case line
      when 'quit'
        break
      when 'show'
        puts '=====  Constants ===== '
        pp Context.constants.map { |k, v| k }
        # puts "\n===== Locals ====="
        # pp Runtime.locals.map { |k, v| { k }
        # puts "\n===== Current self ====="
        # pp Runtime.current_self
        # puts "\n===== Current class ====="
        # pp Runtime.current_class
      else
        begin
          result = (r = interpreter.eval(line)).respond_to?(:ruby_value) ? r.ruby_value : r
          puts "=> #{result.inspect}"
        rescue => error
          puts error
        end
    end
  end
end