Re: Haskell org-mode problems redux

[Lawrence Bottorff <borgauf@gmail.com>]

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Gosh, it worked. So I wasn't crazy or remiss, rather, I just didn't know
how deep the rabbit hole was. Thanks! One odd thing still. I tried to run

#+begin_src haskell
:set prompt-cont ""
#+end_src

and like other times before trying to run Haskell blocks it complained
saying

executing Haskell code block...
org-babel-script-escape: ‘org-babel-script-escape’ expects a string

so I add :results output to the #+begin line and it works. Would anyone
know what that is about?


On Thu, May 30, 2019 at 3:25 PM Bruno Barbier <brubar.cs@gmail.com> wrote:

>
> Hi Lawrence,
>
>
> Lawrence Bottorff <borgauf@gmail.com> writes:
>
> > I've been trying to get Haskell to work in babel code blocks for a long
> > time. A year or so ago I tried and eventually gave up. I tried again
> > recently . . . same old problems, i.e., the code block is evaluated
> > exclusively by the ghci REPL, which doesn't understand or play well with
> an
> > org babel code block.
> >
> ...
> > Soooo, any ideas?
>
> I'm using the header arguments:
>
>
>     :prologue ":{\n" :epilogue ":}\n"
>
>
>
> to request org to insert those multiline tags :{ :}
> (so, I'm not using ":set +m").
>
> I'm defining these header args as headline properties (so that I don't
> have to enter them again and again).  Something like that:
>
>   #+begin_example
>     ,** A title
>        :PROPERTIES:
>        :header-args:haskell: :prologue ":{\n" :epilogue ":}\n"
>        :END:
>   #+end_example
>
> I'm telling ghci to not insert a prompt, when waiting for the end of a
> multiline.
>
> #+begin_src haskell
> :set prompt-cont ""
> #+end_src
>
>
> Configured like this, it seems to be working quite well for me (great
> job org and GHC teams!).
>
>
> #+begin_src haskell
>   doubleSmallNumber x =
>       if x > 10
>           then x
>           else x * 2
> #+end_src
>
> No error.
>
> #+begin_src haskell
> let
>     showMe :: Int -> [String]
>     showMe x = [show x, show $ doubleSmallNumber x]
> in
>   [ ["x", "doubleSmallNumber x"]
>   , showMe 3
>   , showMe 13
>   ]
> #+end_src
>
> #+RESULTS:
>     |  x | doubleSmallNumber x |
>     |  3 |                   6 |
>     | 13 |                  13 |
>
>
>
> My config:
>
>     | ghci  | 8.6.3 |
>     | emacs |  26.1 |
>     | org   | 9.2.3 |
>     | OS    | linux |
>
>
> If it doesn't work for you on GNU/Linux, post the example and I will try
> it on my computer (sorry, I won't be able to help you with Microsoft
> Windows though).
>
>
>
> Bruno
>
>
> > LB
>

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