add a cool lua repl

lib/lua-repl/IDEAS.md

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+  * plugins
+    * replace /^=/ with 'return'
+    * handle locals
+    * override debug.debug
+    * supple (http://cgit.gitano.org.uk/supple.git)
+  * handle locals (debug.sethook?)
+    * debug.sethook, catch return of our chunk and grab its locals
+    * rewrite source code/bytecode before evaluation
+    * custom interpreter patch to "pcall and get bindings"
+    * custom module that dips into internals to "pcall and get bindings"
+  * some sort of debugger?
+  * don't contaminate globals
+  * tab completion (\_\_complete metamethod)
+    * "safe" evaluation (don't allow calling of C functions, except for those in a whitelist?)
+  * displaystack instead of displayerror(err)? (should xpcall return false, stack\_table?)
+  * visual REPL (like Factor; being able to print multi-colored/multi-sized text, images, etc)
+  * syntax highlighting
+  * paren/brace matching?
+  * snippets?
+  * code navigation (go to definition?)
+  * repls that "attach" to different objects (ie. inspect a single object; self is that object.  completions happen against that object?)
+  * browsable/searchable REPL history
+    * not entirely sure what I mean here...
+  * safe termination of evaluated code (if I Control-C during an evaluation)
+  * store stdout/stderr output in a variable somewhere?
+  * persistence (pluto-based image)
+
+hooks
+=====
+
+  * what to do when we encounter an incomplete Lua fragment
+  * processing a line
+  * something for debug.debug...
+
+Implementations
+===============
+
+  * Console
+  * GUI
+  * Web
+  * IRC
+    * safety hooks
+  * Awesome