Help with indentation in haskell
reddit / emacs

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patrickaldis · 2022-11-06 10:18

I'm trying to switch from vscode, but I'm having a few problems with
indentation.

The smart indent doesn't seem to recognise the correct number of
spaces.

https://reddit.com/link/ynmdap/video/pz2uwvgv1by91/player

Is this the correct behaviour for haskell files?

Thanks for any help :)

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pwnedary · 2022-11-06 12:35

Instead of `o` type `A<RET>` to continue on the next line, when in
Evil Normal mode. That way it runs the haskell-mode `newline-and-
indent` function which is "more contextual" instead of opening a new
line and then attempting to indent that new line universally. I guess
you could override `o` to do just that when editing Haskell files.

And as you likely already know, you can hit `<Tab>` to cycle between
possible indentation levels.

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patrickaldis · 2022-11-06 12:48

Thanks so much! Didn't realise evil indented differently. That's a bit
of a pain

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SasukeUchiha231 · 2022-11-06 13:48

you have to set evil-auto-indent t, for evil to auto indent.

(setq evil-auto-indent t)

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pwnedary · 2022-11-06 14:27

That variable defaults to `t`.

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yordanm · 2022-11-06 15:55

Stop being evil.

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fatfingerdeathcrunch · 2022-11-06 16:51

Evil is doing indentation, but based on a strange variable. Can‘t look
it up right now. Check the function bound to `o` with `C-h-k o` maybe
it is already in its doc.

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fatfingerdeathcrunch · 2022-11-06 17:30

Ah sorry, mixed that up. It was a different case for me. I had to set
\`sh-basic-offset\`. In your case, evil is calling \`evil-open-below\`
which is calling \`indent-according-to-mode\`:

>Indent line in proper way for current major mode. Normally, this is
done by calling the function specified by the variable \`indent-line-
function'.  However, if the value of that variable is present in the
\`indent-line-ignored-functions' variable, handle it specially (since
those functions are used for tabbing); in that case, indent by
aligning to the previous non-blank line.