# This is a small REPL for Nila to test out nila code and do bug fixes

require 'readline'

require 'fs'

require 'sys'

exec = require('child_process').exec

file_name = "#{__dirname}/my_file.nila"

output_file_name = "#{__dirname}/my_file.js"

stream = fs.createWriteStream(file_name)

stream.once 'open', do |fd|

 stream.write("# REPL Session #{new Date().to_s}\n\n")
 
end

rl = readline.createInterface(process.stdin, process.stdout)

rl.setPrompt('nila> ')

rl.prompt()

read = rl.on 'line', do |line|
  stream.write("puts (#{line})\n\n")
  exec 'nilac -c my_file.nila', do |error,stdout,stderr|
    if error != nil
      sys.print("error: #{error}")
    end
    if stdout.strip == "Compilation is successful!"
      exec output_file_name, do |error,stdout,stderr|
        if error != nil
          sys.print(error + "\n")
        else
          sys.print(stdout + "\n")
        end
      end
    end
  end
  rl.prompt()
end

read.on 'close', do 
  stream.end()
  fs.unlink file_name, do |err|
    puts "Nila file couldn't be deleted!"
  end
  fs.unlink output_file_name, do |err|
    puts "Output js file couldn't be deleted!"
  end
  puts "\n\nThanks for trying out Nila!\n"
  puts "You can learn more about Nila at http://adhithyan15.github.io/nila\n"
  process.exit(0)
end