Re: Customize Conversion for Identifiers in Code Blocks

[Ranjit Jhala <rjhala-fWt/sZ2FBdz2fBVCVOL8/A@public.gmane.org>]

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Thanks! I tried that and the filter indeed compiles but converting a single 
`CodeBlock` into a list of `CodeBlock` and `latex` blocks 
has the unfortunate effect of introducing line breaks everywhere (I think 
this is because a line break is introduced wherever a code block ends, 
right?)


On Saturday, January 17, 2015 at 4:45:54 PM UTC-8, Matthew Pickering wrote:
>
> f :: Maybe Format -> Block -> [Block] should work fine. 
>
>
> https://hackage.haskell.org/package/pandoc-types-1.12.2.1/docs/Text-Pandoc-JSON.html 
>
> On Sun, Jan 18, 2015 at 12:44 AM, Ranjit Jhala <rjh...-fWt/sZ2FBdz2fBVCVOL8/A@public.gmane.org 
> <javascript:>> wrote: 
> > Hi Matthew, 
> > 
> > The catch is that there's a bunch of other stuff in the `Block`. 
> > 
> > That is, the special token is some substring of `s` 
> > 
> > f :: Block -> Block 
> > f (CodeBlock _ s) = RawBlock (Format "latex")  ("\\MySpecialToken{" ++ s 
> ++ 
> > "}") 
> > f b = b 
> > 
> > and I don't want to lose that. So I can write a function 
> > 
> >     f :: Block -> [Block] 
> > 
> > where each CodeBlock is expanded into a list of : 
> > 
> >   `RawBlock (Format "latex")` of the kind above, 
> >   and the remaining, unchanged CodeBlock 
> > 
> > But that causes problems with toJSONFilter as I can't pass in a 
> > transformation of the form 
> > 
> >    [Block] -> [Block] 
> > 
> > Because there is no instance of Walkable for [Block] ... :( 
> > 
> > On Saturday, January 17, 2015 at 3:06:04 PM UTC-8, Matthew Pickering 
> wrote: 
> >> 
> >> You can write a filter ... f :: Block -> Block and have something like 
> >> the following. 
> >> 
> >> f :: Block -> Block 
> >> f (CodeBlock _ s) = RawBlock (Format "latex")  ("\\MySpecialToken{" ++ 
> s 
> >> ++ "}") 
> >> f b = b 
> >> 
> >> Do you also plan to output to other formats? If so then "toJSONFilter" 
> >> can take a function of type "f :: Maybe Format -> Block -> Block" 
> >> where the first argument is the output format. 
> >> 
> >> Does that make sense? 
> >> 
> >> On Sat, Jan 17, 2015 at 9:05 PM, Ranjit Jhala <rjh...-fWt/sZ2FBdz2fBVCVOL8/A@public.gmane.org> 
> wrote: 
> >> > Hi, 
> >> > 
> >> > I'd like to write a filter that runs on `CodeBlock` such that each 
> >> > identifier that begins 
> >> > with (say) "$$$mytoken" gets rendered in latex not as a 
> >> > 
> >> >     \NormalTok{$$$mytoken} 
> >> > 
> >> > but as 
> >> > 
> >> >     \MySpecialToken{$$$mytoken} 
> >> > 
> >> > Can anyone give me a hint as to how to proceed? The stumbling block 
> is 
> >> > that 
> >> > it seems like 
> >> > the filter should "preserve" the type, so I can write a 
> >> > 
> >> >     myFilter :: CodeBlock -> CodeBlock 
> >> > 
> >> > But the `CodeBlock` type only allows strings -- presumably just 
> >> > replacing 
> >> > (substrings) of the form 
> >> > 
> >> >     $$$mytoken 
> >> > 
> >> > with 
> >> > 
> >> >    \MySpecialToken{$$$mytoken} 
> >> > 
> >> > will only cause the latter to then get "escaped" out during the final 
> >> > latex 
> >> > conversion? 
> >> > 
> >> > Any pointers would be most welcome! 
> >> > 
> >> > Thanks! 
> >> > 
> >> > - Ranjit. 
> >> > 
> >> > -- 
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