Haskell indentation doesn't line up function arguments

Question

I'm using Emacs as my main Haskell editor, and as such, I of course use haskell-mode as the main mode for editing Haskell code.

Now for whatever reason, haskell-indentation doesn't offer an indent point for function arguments.

What I mean is that Emacs will consistently do this: (□ is the other indent point(s))

myFunction = maybe arg1
□            arg2
□            arg3

Instead of doing this:

myFunction = maybe arg1
□            □     arg2
□            □     arg3

Sometimes I need to break functions up onto multiple lines due to the lines getting too long, but not having haskell-mode offer the right indent level is bugging me some.

Anything I can do to alleviate this?

Edit

Seeing as I'm not the only one with this issue, I've opened a ticket on the haskell-mode github page [here]

The layout rules (which are all that care about indentation) only come into effect when one of let/do/where/of appears; and even within a layout context, as long as you don't decrease your indent so that arg1 is indented by less than the maybe is, you run no risk of confusing the indentation. — amalloy
– amalloy, Commented Aug 14, 2015 at 19:16
I have the same issues. Usually I temporarily switch to simple indent mode using turn-on-haskell-simple-indent and then do the right level indent. — Sibi
– Sibi, Commented Aug 14, 2015 at 19:57
@amalloy Not true; foo = do maybe arg1\n.........arg2 would be interpreted very differently from foo = do maybe arg1\n...............arg2, even though in neither case does the indentation decrease. (The former would be foo = do { maybe arg1; arg2 } while the latter would correctly be foo = do { maybe arg1 arg2 }. — Daniel Wagner
– Daniel Wagner, Commented Aug 14, 2015 at 23:44
AFAICT, haskell-indent (as opposed to haskell-indentation) gets this one right. — Stefan
– Stefan, Commented Aug 7, 2016 at 14:49
I'm voting to close this question as off-topic because it belongs on the emacs.stackexchange.com site. — bignose
– bignose, Commented Aug 29, 2016 at 4:15

J_H · Accepted Answer · 2017-12-26 17:13:10Z

1

The haskell-indentation haskell-mode issue was closed last year and won't be fixed.

For desired behavior, use haskell-indent.

answered Dec 26, 2017 at 17:13

J_H

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