Re: C bindings

[Matthew Pickering <matthewtpickering-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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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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