pandoc custom template condition: looking for variable with certain value (yaml metadata)

pandoc custom template condition: looking for variable with certain value (yaml metadata)

[Jan Kröger]

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Hi,

as long as I understood, it is possible to set a pandoc template condition 
which asks if a variable's value is not zero.
But want I need is to create a condition which asks for a variable with a 
certain value.
Is that possible?

An example: I want pandoc to write some yaml metadata (contributors names) 
to the epub's titlepage to give the different contributors their 
credentials (put a label in front of the name). 

I have set them in yaml metadata block like:
contributor:
- role: edt
 text: Person1
- role: pfr
 text: Person2
- role: pht
 text: Person3
- role: trl
 text:

What works is a simple list of different contributors, set in my custom 
template:
$for(contributor)$
$contributor.text$$sep$,
$endfor$

so with:
pandoc metadata.yaml book-content.md -t epub3 -o book.epub

I got a list of all contributors written to the title page:
Person1, Person2, Person3

But what I want instead is this:
Editor: Person1
Proofreader: Person2
Photographer: Person3

So what I am missing is the possibility to set e.g.:
$for(contributor)$
$if(contributor.role)==edt$
<p>Editor: $contributor.text$</p>
$endif$
$if(contributor.role)==pfr$
<p>Proofreader: $contributor.text$</p>
$endif$
$if(contributor.role)==pht$
<p>Photographer: $contributor.text$</p>
$endif$
$endfor$
(Which can't work because it seems this syntax is not implemented.)

How can that be done as long as I use standard conform yaml metadata? I use 
latest pandoc 1.13.2.

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Re: pandoc custom template condition: looking for variable with certain value (yaml metadata)

[John MacFarlane]

+++ Jan Kröger [Mar 09 15 02:44 ]:
>Hi,
>
>as long as I understood, it is possible to set a pandoc template condition
>which asks if a variable's value is not zero.
>But want I need is to create a condition which asks for a variable with a
>certain value.
>Is that possible?

No.

>An example: I want pandoc to write some yaml metadata (contributors names)
>to the epub's titlepage to give the different contributors their
>credentials (put a label in front of the name).
>
>I have set them in yaml metadata block like:
>contributor:
>- role: edt
> text: Person1
>- role: pfr
> text: Person2
>- role: pht
> text: Person3
>- role: trl
> text:
>
>What works is a simple list of different contributors, set in my custom
>template:
>$for(contributor)$
>$contributor.text$$sep$,
>$endfor$
>
>so with:
>pandoc metadata.yaml book-content.md -t epub3 -o book.epub
>
>I got a list of all contributors written to the title page:
>Person1, Person2, Person3
>
>But what I want instead is this:
>Editor: Person1
>Proofreader: Person2
>Photographer: Person3
>
>So what I am missing is the possibility to set e.g.:
>$for(contributor)$
>$if(contributor.role)==edt$
><p>Editor: $contributor.text$</p>
>$endif$
>$if(contributor.role)==pfr$
><p>Proofreader: $contributor.text$</p>
>$endif$
>$if(contributor.role)==pht$
><p>Photographer: $contributor.text$</p>
>$endif$
>$endfor$
>(Which can't work because it seems this syntax is not implemented.)
>
>How can that be done as long as I use standard conform yaml metadata? I use
>latest pandoc 1.13.2.

Two possibilities.  1) Just use the word "Editor" instead of "edt" in
your metadata.  2)  Create a filter that modifies these metadata fields,
changing "edt" to "Editor" etc.

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Re: pandoc custom template condition: looking for variable with certain value (yaml metadata)

[Jan Kröger]

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Will try. Thnx, John!

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