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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