I wish to have an editor that ran GHC[I] every few seconds or so, and underlined sites of syntax errors in red. This would save me a lot of back-and-forth. If an editor did this, I would switch (from kate) in a heartbeat.
in vim, that's called quickfix mode, and vim is certainly not the only editor to provide such a feature. you need to specify the format of GHC error messages, and how to call GHCi, then ':make' will call GHCi on the current file, store and parse any error messages, and provide them in a quickfix window (:help quickfix). from each error, you can jump directly to the corresponding source location, or you can jump through the list or errors, with the current error message shown in the quickfix window. http://vimdoc.sourceforge.net/htmldoc/quickfix.html#quickfix i wouldn't recommend running that kind of check automatically at arbitrary moments in your editing process, but you can if you want, using autocommands (:help :autocmd), and since the list of error locations is available (:help getqflist()), you could highlight them directly in the source as well if you wanted to.. claus