Re: Determining that a Pandoc Variable is the Empty String

[John MacFarlane <fiddlosopher-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

Try

tags: []

in your YAML if you don't want the for loop to be executed.

> On Mar 7, 2023, at 8:41 PM, S. Manning <scriptor-aFO/2INALiozYggVrLCuDg@public.gmane.org> wrote:
> 
> I would like to add a tag system to my static site which I generate with Pandoc templates.  Adding a tags: variable in myPage.yaml is easy, but then I want to add links from pages with the tag to the page for that tag.  Code like:
> 
> $for(tags)$
> <a href="https://mysite.org/tags/$tags$.html">⇐ back to $tags$</a>&nbsp;
> $endfor$
> 
> adds a link even if the tags variable is empty ("tags: " in the YAML file).
> 
> How can I check that the tag is not empty or a null string or however Pandoc defines it?
> 
> https://pandoc.org/MANUAL.html#interpolated-variables alludes to variable types such as string and list, but does not define them or explain how to get the attributes of complex variables such as lists.
> 
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