wycats: Handy interactive console that can switch between JS and Ruby.

.gitignore

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+Makefile
+mkmf.log
+spidermonkey.o
+spidermonkey.so

interactive.rb

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+require "spidermonkey"
+require "readline"
+# require "#{File.dirname(__FILE__)}/env/env"
+
+def copy_history
+  new_history = []
+  until Readline::HISTORY.empty?
+    new_history.push(Readline::HISTORY.pop)
+  end
+  new_history
+end
+
+def paste_history(old_history)
+  until old_history.empty?
+    Readline::HISTORY << old_history.pop
+  end
+end
+
+class SpiderMonkey::Value
+
+  def method_missing(meth, *args)
+    if val = meth.to_s.match(/^(.*)=$/)
+      set_property(val[1], *args)
+    elsif !args.empty?
+      call_function(meth.to_s, *args)
+    else
+      get_property(meth.to_s)      
+    end
+  end
+
+  alias_method :[], :get_property
+  alias_method :[]=, :set_property
+
+end
+
+CX = cx = SpiderMonkey::Context.new
+
+global = cx.global
+
+cx.global.function("print") {|x| puts x}
+
+local_binding = binding
+
+ruby_readline = []
+
+loop do
+  input = Readline.readline("js> ", true)
+  break if input == "exit"
+  if input == "ruby"
+    js_readline = copy_history
+    paste_history(ruby_readline)
+    loop do
+      input = Readline.readline("rb> ", true)
+      break if input == "done"
+      exit if input == "exit"
+      begin
+        puts "=> " + eval(input, local_binding).inspect
+      rescue Object => e
+        puts e.message
+        puts e.backtrace
+      end
+    end
+    ruby_readline = copy_history
+    paste_history(js_readline)
+    next
+  end
+  begin
+    puts "=> " + cx.eval(input).inspect
+  rescue Object => e
+    puts e.message
+    puts e.backtrace
+  end
+end