"Simon Peyton-Jones"
| What about my idea? Can't there be a module, say called | *interpreter* which | you can add and remove definitions from on-the-fly? | Something that would put you tighter in the loop. Without | having to go back | to the editor edit stuff, reload from interpreter, choke on | error, see what | went wrong, etc. Just scratch some code on the CLI, see what | you've defined | so far, edit the current module, and evaluate what you want | to.
So the CLI would have to have a way to show you what the current "interpreter" module was, and let you edit it. How does that differ from an editor? This smells like a tarpit to me: once you provide a basic editor, everyone will want more features. Better, surely, to use an existing editor?
Definitely. An environment like this is pretty trivial todo in Emacs. In fact, the Emacs Haskell mode does most of that already anyway. Manuel