Re: C bindings

[Shahbaz Youssefi <shabbyx-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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As far as I could figure out, it's ReaderOptions and WriterOptions that
need to be derived from Data and Typeable.

Thanks a lot!

P.S. Please let me know the commit that adds this. I'm curious to know how
you make WriterOptions derive from Data.

On Fri, Feb 27, 2015 at 12:02 AM, Matthew Pickering <
matthewtpickering-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:

> Could you perhaps give me a list of what we are currently missing and I
> can add them in. There's no reason for us not to derive them as they can be
> derived for all types..
>
> On Thu, Feb 26, 2015 at 6:56 PM, Shahbaz Youssefi <shabbyx-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> wrote:
>
>> @Matthew, so is that what's going to happen? Should I just wait for the
>> next release of pandoc and those types would be derived?
>>
>> On Tue, Feb 24, 2015 at 4:00 PM, Shahbaz Youssefi <shabbyx-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
>> wrote:
>>
>>> P.S. libpandoc derives LibPandocSettings from those types because it
>>> uses a Data.Generics.Rep.toRep function on it.
>>>
>>> On Tue, Feb 24, 2015 at 3:51 PM, Shahbaz Youssefi <shabbyx-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
>>> wrote:
>>>
>>>> I would imagine it would. I can't say I really understand what they
>>>> are, but bottom line is that [`LibPandocSettings` in the libpandoc
>>>> implementation](
>>>> https://github.com/ShabbyX/libpandoc/blob/master/src/LibPandoc/Settings.hs#L10)
>>>> contains `ReaderOptions` and `WriterOptions` and wants `deriving (Data,
>>>> Typeable)`.
>>>>
>>>> Again, I wouldn't know why `LibPandocSettings` wants to be derived from
>>>> those two types. I'll try to play around in the meantime, see if I can just
>>>> remove this requirement.
>>>>
>>>> On Tue, Feb 24, 2015 at 3:44 PM, Matthew Pickering <
>>>> matthewtpickering-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>>>>
>>>>> Would it just be easier if we derived Data and Typeable instances in
>>>>> pandoc?
>>>>>
>>>>> On Tue, Feb 24, 2015 at 2:39 PM, Shahbaz Youssefi <shabbyx-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
>>>>> wrote:
>>>>>
>>>>>> Hi,
>>>>>>
>>>>>> I'm updating libpandoc to align with pandoc 1.13, but I'm currently
>>>>>> having a compilation issue that is beyond my understanding.
>>>>>>
>>>>>> In [LibPandoc/Instances.hs](
>>>>>> https://github.com/ShabbyX/libpandoc/blob/master/src/LibPandoc/Instances.hs),
>>>>>> there is the following code, that had been working with pandoc 1.11:
>>>>>>
>>>>>>     {-# LANGUAGE TemplateHaskell #-}
>>>>>>
>>>>>>     module LibPandoc.Instances where
>>>>>>
>>>>>>     import Data.Data
>>>>>>     import Data.DeriveTH
>>>>>>     import Text.Pandoc
>>>>>>     import Text.Pandoc.Shared
>>>>>>     import Text.Highlighting.Kate.Types
>>>>>>
>>>>>>     $( derive makeTypeable ''ReaderOptions )
>>>>>>     $( derive makeData ''ReaderOptions )
>>>>>>     $( derive makeTypeable ''WriterOptions )
>>>>>>     $( derive makeData ''WriterOptions )
>>>>>>     ...
>>>>>>
>>>>>> From what I understand, `derive makeData` does some magic, so that
>>>>>> later one could say `deriving (Data)` for a type that contains
>>>>>> `ReaderOptions` and `WriterOptions`.  With newer pandoc, it seems that some
>>>>>> types were added.  With `TrackChanges` used in `ReaderOptions`, I can add
>>>>>> similar `derive makeTypeable/makeData` lines and everything is ok.  With
>>>>>> `MediaBag` used in `WriterOptions` however, I can't do this.
>>>>>>
>>>>>> Without `derive makeData` for `MediaBag`, I get the following error
>>>>>> for `$( derive makeData WriterOptions )`:
>>>>>>
>>>>>>     No instance for (Data MediaBag) arising from a use of `k'
>>>>>>     Possible fix: add an instance declaration for (Data MediaBag)
>>>>>>     In the expression:
>>>>>>         ... A VERY LONG EXPRESSION WITH A LOT OF `k` INFIX CALLS ...
>>>>>>
>>>>>> If I add `$( derive makeData MediaBag)` before, I get this error on
>>>>>> it:
>>>>>>
>>>>>>     Not in scope: data constructor `MediaBag'
>>>>>>
>>>>>> I have `import Text.Pandoc.MediaBag`.
>>>>>>
>>>>>> From what I could make out, the reason is probably that others, such
>>>>>> as `TrackChanges` are defined with the `data` keyword, but `MediaBag` is
>>>>>> defined with the `newtype` keyword.  Is that so? How then, can I make `$(
>>>>>> derive makeData ''MediaBag)` work? If not possible, how can I make `$(
>>>>>> derive makeData ''WriterOptions )` work?
>>>>>>
>>>>>> Thanks for the help,
>>>>>> Shahbaz
>>>>>>
>>>>>> On Sunday, June 30, 2013 at 8:30:37 PM UTC+2, fiddlosopher wrote:
>>>>>>>
>>>>>>> Thanks for doing this.  I've updated pandoc-extras.
>>>>>>>
>>>>>>> +++ Shahbaz Youssefi [Jun 30 13 13:04 ]:
>>>>>>> >    Hi again,
>>>>>>> >    I updated libpandoc (for C bindings) to the current version of
>>>>>>> pandoc
>>>>>>> >    and made some improvements. I sent a pull request to toyvo, but
>>>>>>> it has
>>>>>>> >    been left unanswered (he's probably not so active on github).
>>>>>>> In the
>>>>>>> >    meantime, you could
>>>>>>> >    [refer]([1]https://github.com/jgm/pandoc/wiki/Pandoc-Extras)
>>>>>>> to my fork
>>>>>>> >    at:
>>>>>>> >    [2]https://github.com/ShabbyX/libpandoc
>>>>>>> >    Have a nice day,
>>>>>>> >    Shahbaz
>>>>>>> >
>>>>>>>
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