Re:

[Uwe Brauer <oub-YB6e1s5WF/He5aOfsHch1g@public.gmane.org>]

>>> "John" == John MACFARLANE <jgm-TVLZxgkOlNX2fBVCVOL8/A@public.gmane.org> writes:

   > +++ Uwe Brauer [Aug 23 17 16:13 ]:
   >> I wouldn't mind to download and compile the dev version of pandoc.
   >> But how am I supposed to do it with that version?

   > With dev pandoc,

   > pandoc -t native -f latex
   > \label{hi}
   > [Para [Span ("hi",[],[("label","hi")]) [Str "[hi]"]]]

   > So your filter could pattern match on a Span with
   > label attribute:

   > go (Math _ _) = Str "FORMULA"
   > go (Span (_,_,[("label",_)]) _) = Str "LABEL"
   > go x = x

I just found out that I have a compiled version from march this year.

,----
| pandoc 1.19.2.1
| Compiled with pandoc-types 1.17.0.4, texmath 0.9, skylighting 0.1.1.4
| Default user data directory: /home/oub/.pandoc
| Copyright (C) 2006-2016 John MacFarlane
| Web:  http://pandoc.org
| This is free software; see the source for copying conditions.
| There is no warranty, not even for merchantability or fitness
| for a particular purpose.
`----

So I hoped this is recent enough.
I now considered the following stripmath.hs file
,----
| import Text.Pandoc.JSON
|     
| main = toJSONFilter stripmath
|     where stripmath (Math _ _) = Str "FORMULA"
|           stripmath x = x
| go (Math _ _) = Str "FORMULA"
| go (Span (_,_,[("label",_)]) _) = Str "LABEL"
| go x = x
`----
then I did
ghc --make stripmath.hs

And after compilation

/home/oub/.local/bin/pandoc eulerpoisson.tex -t json | /home/oub/scripts/Strip2/stripmath | pandoc -f json -t plain -o euler-grammar.tex

But I obtainedstripmath: Error in $: expected product (:*:), encountered Object
pandoc: Error in $: not enough input

Sorry for this elementary question.

Uwe Brauer