On 14/05/07, Christopher L Conway
For example, here's the "Hello, world" example from the tutorial, with the indentation induced by pounding Tab in haskell-mode.
test.hs: module Test where
import IO
main = do putStrLn "Hello, world"
Prelude> :l test [1 of 1] Compiling Test ( test.hs, interpreted )
Are you learning from YAHT, by any chance? That's the only place I've seen the weird convention of placing the 'where' of the 'module X' bit on a separate line. By far the most common convention in normal Haskell is to do as follows: module X where [rest of module] Things should work better if you follow this convention. What you describe still sounds like a bug, though.
Again, if I hit tab on the "then" or "else" lines, emacs reports "Sole indentation". But if I manually change the indentation, it works.
This too looks like a bug. As you remark, if statements within do-blocks have different indentation to everywhere else, confusingly.
Does haskell-mode support code layout? Are there conventions I need to know about to make it behave properly? I have haskell-mode version 2.1-1 installed from the Ubuntu feisty repository.
You should install 2.3 from the haskell-mode page [1]. Isaac Jones, maintainer of the Debian haskell-mode package has been contacted in order to get the latest version in the Debian repository, so it should happen soon, but in the mean time you could download and install the latest version yourself. It features quite a few bugfixes and new features that I imagine are documented on the aforementioned page. haskell-mode's indentation engine is still one thing I'm yet to get my head around, and its being written in Emacs Lisp doesn't help the matter! Still, it's on my todo list. [1]: http://haskell.org/haskell-mode -- -David House, dmhouse@gmail.com