#!/usr/bin/env ruby
root = File.expand_path('../..', __FILE__)
%w(lib shen/lib).each do |path|
  full_path = File.join(root, path)
  $LOAD_PATH << full_path unless $LOAD_PATH.include? full_path
end
require 'shen_ruby'

# Leave gracefully if someone hits Control-C during loading
Signal.trap("INT") { puts "\nLeaving..."; exit 1 }

# Load the Shen Envinronment
print "Loading..."
STDOUT.flush
start = Time.now.to_f
shen = ShenRuby::Shen.new
now = Time.now.to_f
puts ". Completed in %0.2f seconds.\n" % (now - start)

# Now that the Shen environment is loaded, repurpose the SIGINT
# handler to interrupt the current execution.
class ReplInterrupt < StandardError; end
Signal.trap("INT") { raise ReplInterrupt }

# Launch the REPL
command = :"shen.shen"
begin
  shen.__eval(Kl::Cons.list([command]))
rescue StandardError => e
  # K Lambda simple errors are already handled by the Shen REPL. Therefore
  # this must be another type of exception. Print it as such and reenter
  # the REPL without re-display the initial credits.
  if e.kind_of? ReplInterrupt
    puts "Execution interrupted. If you are trying to exit the REPL, use (quit)."
  else
    puts "Ruby exception: #{e.message}"
  end
  command = :"shen.loop"
  retry
end