Re: Filter with arguments

[John MacFarlane <jgm-TVLZxgkOlNX2fBVCVOL8/A@public.gmane.org>]

This is a pretty common request.  A couple of complications:

1.  Pandoc calls each filter with one argument, the name of
the output format.  (Filters thus have access to this.)
If we allowed `-F "pantable -t csv"`, how would this work?
Would pandoc call `pantable latex -t csv`?  Would the filter
be expecting this?

2.  We'd get a quoted argument like `"pantable -t csv"` as a
single string from the environment.  So pandoc would have to
do its own parsing of this string into a command, options and
arguments.  This is tricky.  Maybe some people are already
using filters with spaces in them, like `-F "My Cool Filter.py".
This kind of thing would break if pandoc assumed that the
command was "My" and "Cool" an argument.

+++ Kolen Cheung [Jan 05 17 20:32 ]:
>   Currently, if one need to pass arguments to a filter, one need to pipe
>   it through.
>
>   It would be convenient in some cases to allow passing argument to
>   filters. e.g.
>pandoc -F "pantable -t csv" -s -o example.tex example.md
># which is equiv. to
>pandoc -t json -s example.md | pantable -t csv | pandoc -f json -s -o example.te
>x
>
>   To elaborate a little bit further: I want to write a filter that at the
>   same time do:
>    1. convert code block to table
>    2. convert pandoc tables to code block, potentially with different
>       output code formats (e.g. csv, yaml, json, etc. or even other kinds
>       e.g. HTML, Div with CSS table, etc.)
>    3. standalone cli. i.e. not a filter
>
>   Right now (1) and (2) are mutually exclusive and has to be split into 2
>   filters. (1) and (3) can potentially be written in the same executable,
>   but it is uglier and pointless to do so without including (2).
>   ​
>
>   --
>   You received this message because you are subscribed to the Google
>   Groups "pandoc-discuss" group.
>   To unsubscribe from this group and stop receiving emails from it, send
>   an email to [1]pandoc-discuss+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
>   To post to this group, send email to
>   [2]pandoc-discuss-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
>   To view this discussion on the web visit
>   [3]https://groups.google.com/d/msgid/pandoc-discuss/e8cf9c92-7aa7-4841-
>   85d0-7464c771cf6e%40googlegroups.com.
>   For more options, visit [4]https://groups.google.com/d/optout.
>
>References
>
>   1. mailto:pandoc-discuss+unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
>   2. mailto:pandoc-discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
>   3. https://groups.google.com/d/msgid/pandoc-discuss/e8cf9c92-7aa7-4841-85d0-7464c771cf6e-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org?utm_medium=email&utm_source=footer
>   4. https://groups.google.com/d/optout

-- 
You received this message because you are subscribed to the Google Groups "pandoc-discuss" group.
To unsubscribe from this group and stop receiving emails from it, send an email to pandoc-discuss+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To post to this group, send email to pandoc-discuss-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To view this discussion on the web visit https://groups.google.com/d/msgid/pandoc-discuss/20170106114647.GG791%40Administrateurs-iMac-3.local.
For more options, visit https://groups.google.com/d/optout.