#!/usr/bin/env ruby

require 'optparse'

require File.join(File.expand_path(File.dirname(__FILE__)), '/../lib/p-lang')

options = OptionParser.new do|opts|
  opts.banner = "Usage: p-lang [option]"
  opts.version = "0.2.0"

  opts.on("-e", "-e 'COMMAND'", "interp one line of script.") do |command|
    sa = PLang::Parser::SyntaxAnalyser.new(command)
    vm = PLang::VM::Interpreter.new(sa.parse)
    vm.execute!
  end

  opts.on("-i", "-i", "interactive p shell.") do
    shell = PLang::IPS::Shell.new
    shell.start
  end

  opts.on("-f", "-f FILE", "interp a script file.") do |file|
    begin
      program = File.readlines(file).join("")
    rescue
      puts "No such file (LoadError)"
      exit
    end
    begin
      sa = PLang::Parser::SyntaxAnalyser.new program
      vm = PLang::VM::Interpreter.new(sa.parse)
      vm.execute!
    rescue Exception => e
      puts "#{file}:#{e}"
    end
  end
end

argv = ARGV
begin
  if ARGV.length > 0
    if options.parse!(ARGV).length > 0
      options.parse!(["-f" + ARGV[0]])
    end
  else
    # without arguments
    options.parse!(["-i"])
  end
rescue
  puts "p-lang: unrecognized option"
end