[Haskell-cafe] Haskell syntax/indentation for vim

[Erlend Hamberg]

Hi,

I wrote a Haskell indenter for Haskell for the Kate editor a few years ago,
which – if I remember correctly – worked quite well. It's quite simple and
doesn't try to bee *too* clever, but has some logic for when it should
dedent. Not sure if it's helpful, but you could have a look (it's
well-commented javascript):

https://projects.kde.org/projects/kde/kde-baseapps/kate/repository/revisions/master/entry/part/script/data/indentation/haskell.js

Erlend


On 4 March 2013 09:40, Tristan Ravitch <travitch at cs.wisc.edu> wrote:

> I like automatic "outdenting" too, but I only came up with three cases
> where I felt like I could do it reliably:
>
>  * With let/in as you described
>  * After a catchall case:
>
>    case ... of
>      C1 -> ...
>      C2 -> ...
>      _ -> ...
>    -- dedent back to here
>
>  * And similarly after a do block ending in a return
>
> Even that last one is slightly questionable, I feel, but probably works
> for almost all cases.  Are there any others?
>
> On Mon, Mar 04, 2013 at 12:20:12PM -0500, Dan Doel wrote:
> > I hadn't seen this before, but I tried it out, and the parts I'm
> interested
> > in are nice. The indenting is less flaky than what I was using before
> > (comments had issues).
> >
> > If you're rewriting things, though, it'd be nice to be able to customize
> > indentation a little more. For instance, I like laying out ifs like:
> >
> >     if foo
> >       then bar
> >       else baz
> >
> > But I like to lay out wheres as:
> >
> >     foo = ...
> >      where
> >      bar = ...
> >
> > But both the indents here are based on shiftwidth, so they're tied
> together.
> >
> > Another 'nice to have' would be some intelligent outdenting. For
> instance,
> > if you type a let block right now:
> >
> >     let foo = zig
> >         bar = zag
> >         in ...
> >
> > That's what you'll get. It'd be nice if typing the 'in' snapped back to
> the
> > let. I know it's possible to implement something like this, because the
> > scala indentation mode I use frequently outdents when I type '=>' (which
> > annoys the hell out of me, because it's almost never correct), but I
> don't
> > know if it can be done intelligently enough to be useful (which would be
> > important). Something to keep in mind, though.
> >
> > -- Dan
> >
> >
> > On Sun, Mar 3, 2013 at 9:48 AM, dag.odenhall at gmail.com <
> > dag.odenhall at gmail.com> wrote:
> >
> > > I see now in your README that you have seen vim2hs.  I'd love to hear
> what
> > > you disliked about it, especially given my plan to rewrite the whole
> thing
> > > [1]! :)
> > >
> > > [1] https://github.com/dag/vim2hs/issues/45
> > >
> > >
> > > On Sun, Mar 3, 2013 at 3:38 PM, dag.odenhall at gmail.com <
> > > dag.odenhall at gmail.com> wrote:
> > >
> > >> Hi
> > >>
> > >> Have you seen vim2hs?
> > >>
> > >> https://github.com/dag/vim2hs
> > >>
> > >>
> > >> On Sat, Mar 2, 2013 at 9:11 PM, Tristan Ravitch <travitch at cs.wisc.edu
> >wrote:
> > >>
> > >>> Cafe,
> > >>>
> > >>> I've recently been playing with vim and wasn't quite satisfied with
> the
> > >>> existing syntax highlighting and indentation, so I thought I'd try my
> > >>> hand at a new Haskell mode:
> > >>>
> > >>> https://github.com/travitch/hasksyn
> > >>>
> > >>> It is minimal in that it doesn't provide support for running external
> > >>> commands over code or anything fancy.  It just does syntax
> highlighting
> > >>> and reasonably-smart indentation.  There is no support for literate
> > >>> Haskell since supporting both with one mode is very tricky.
> > >>>
> > >>> It might be useful to some people.  Comments, bug reports, and
> > >>> suggestions
> > >>> welcome.
> > >>>
> > >>> _______________________________________________
> > >>> Haskell-Cafe mailing list
> > >>> Haskell-Cafe at haskell.org
> > >>> http://www.haskell.org/mailman/listinfo/haskell-cafe
> > >>>
> > >>>
> > >>
> > >
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> > >
> > >
>
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>


-- 
Erlend Hamberg
ehamberg at gmail.com
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