Re: filter module's inline command and supressed spacing

[Aditya Mahajan <adityam@umich.edu>]

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On Tue, 30 Dec 2014, Piotr Kopszak wrote:

> Hello list,
>
> It looks like a bug in the filter module, but maybe I'm doing
> something wrong. Any help will be greatly appreciated. When using the
> \inlinepandoc command in the first paragraph below the space at the
> end of the paragraph in "życiaA. Mickiewicza" is supressed when it
> should be "życia A. Mickiewicza". This does not happen when using
> pandoc environment. If you want to run the minimal example you have to
> make sure you got the recent pandoc which supports twiki input format
> and create the "output" subdirectory in your working directory.
>
> Best
>
> Piotr
> ----------------------------------------------------------------------------
> \usemodule[filter]
> \defineexternalfilter
>  [pandoc]
>  [
>    filter={pandoc -f \externalfilterparameter{format} -t context
>                   -o \externalfilteroutputfile},
>    format=twiki,
>    directory=output,
>  ]
> \starttext
> Inne tyt.: Wizyta pana Franciszka Grzymały, Exegi monumentum aere
> perennius....  Powst. Paryż, na autografie podpis: "Paryż, 12 marca
> 1833. Wiersze natchnione wizytą Fr. Grzymały".   Pdr: {\it Czas} 1859
> nr nr 118 s. 2.  (\inlinepandoc{w artykule L*** (E.
> Januszkiewicza)  "Notatki wspomnień z życia A. Mickiewicza"}).
>
> \startpandoc
> Inne tyt.: Wizyta pana Franciszka Grzymały, Exegi monumentum aere
> perennius....  Powst. Paryż, na autografie podpis: "Paryż, 12 marca
> 1833. Wiersze natchnione wizytą Fr. Grzymały".   Pdr: {\it Czas} 1859
> nr nr 118 s. 2.  (w artykule L*** (E. Januszkiewicza)
> "Notatki wspomnień z życia A. Mickiewicza").
> \stoppandoc
> \stoptext

Sorry for the late reply.

Short answer: Change \defineexternalfilter to (add --no-wrap):

fineexternalfilter
   [pandoc]
   [
     filter={pandoc --no-wrap -f \externalfilterparameter{format} -t 
context
                    -o \externalfilteroutputfile},
     format=twiki,
     directory=output,
   ]


Long answer: This is what is happening.

Normally, when an external filter like pandoc creates an output, it adds a 
`\n` at the end of the last line. This leads to an empty line when the 
file is read back in ConTeXt. To prevent that I set \endlinechar=-1 in the 
inline mode.

However, this also means that the linebreak at the end of every line is 
ignored. Typically this is not a problem because you expect \inline<...> 
snippets to be short.

But pandoc formats its output to 80 characters. So, the example that you 
gave is formatted as:

-----
w artykule L*** (E.Januszkiewicza) \quotation{Notatki wspomnień z życia
A. Mickiewicza}
----

When reading it, the space at the end of 'zycia' is ignored.

I can try not setting \endlinechar=-1, and adding \removeunwantedspaces 
after reading a file, but this will require some extensive testing. An 
easier solution is to add --no-wrap option to pandoc, so that pandoc does 
not wrap the lines in the first place.

Aditya

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