No indentation suggested for case clauses

[dzhus]

I'm experiencing broken indentation for case keyword clauses with haskell-mode version 13.15-git (/home/dzhus/.emacs.d/elpa/haskell-mode-20150729.316/)

Minimal example:

f x =
  case x of
    Just 5 -> return ()

When I hit TAB on the line with Just, it suggests to line it up with case:

f x =
  case x of
  Just 5 -> return ()

Here's an illustration of the problem with «Show indentations» option switched on:

The rest of the options in haskell-indentation group are set to standard.

[gracjan]

Hmm, technically this is correct in current implementation of haskell-indentation. The point is that clause after of may be empty and Just may start a new statement. haskell-indentation does not look past the first token on the line you are indenting.

I see how this might be confusing though... just not sure how to improve given current indentation design.

[dzhus]

Thanks for the explanation. However, a there's an equal possibility that there is a clause after the case line (and this is usually the case in the wild with actual Haskell code). It should be possible to cycle through indentation options with TAB.

haskell-indentation does not look past the first token on the line you are indenting.

I believe in this case we should look at the line before the current line? And how is this different from case line being indented after f x?

[gracjan]

Hmm, I think I misunderstood your comment.

To clarify: I get BOTH indentation points proposed. Do you get something else?

[dzhus]

Yes, I am only suggested to have my Just 5 aligned on the same column as case. I cannot cycle with TAB to actually indent the Just 5 line.

[gracjan]

That is interesting. Are you using haskell-indentation or something else? The latest github version or other version?

[gracjan]

To my best knowledge this is working correctly. Reopen if you check against latest github version of haskell-indentation mode and it does not work.