Re: Re-use metadata variables in header-includes?

[Indy Singh <singh400-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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Question is nicely formatted here: https://github.com/jgm/pandoc/issues/8919

On Monday, 26 June 2023 at 21:43:36 UTC+1 Indy Singh wrote:

> Question is nicely formatted here, but a copy and paste:-
>
> Given this as input.md:-
>
> ```markdown
> ---
> title: Strings Are Evil
> subtitle: Reducing memory allocations from 7.5GB to 32KB
> header-includes: |
>     <meta name="og:type"                property="og:type" 
> content="website">
>
>     <meta name="title"                  property="title" 
> content="{{title}}" />
>     <meta name="description"            property="description" 
> content="{{subtitle}}" />
>     
>     <meta name="og:title"               property="og:title" 
> content="{{title}}" />
>     <meta name="og:description"         property="og:description" 
> content="{{subtitle}}" />
>
>     <meta name="twitter:title"          property="twitter:title" 
> content="{{title}}" />
>     <meta name="twitter:description"    property="twitter:description" 
> content="{{subtitle}}" />
> ---
> rest of the blog
> ```
>
> Produce this output:-
>
> ```html
> <meta name="og:type"                property="og:type" content="website">
> <meta name="title"                  property="title" content="Strings Are 
> Evil" />
> <meta name="description"            property="description" 
> content="Reducing memory allocations from 7.5GB to 32KB" />
> <meta name="og:title"               property="og:title" content="Strings 
> Are Evil" />
> <meta name="og:description"         property="og:description" 
> content="Reducing memory allocations from 7.5GB to 32KB" />
> <meta name="twitter:title"          property="twitter:title" 
> content="Strings Are Evil" />
> <meta name="twitter:description"    property="twitter:description" 
> content="Reducing memory allocations from 7.5GB to 32KB" />
> ```
>
> I did try 
> https://pandoc.org/lua-filters.html#replacing-placeholders-with-their-metadata-value 
> and played about with 
> https://github.com/jgm/pandoc/issues/1950#issuecomment-74613325 but I 
> could never get it to work inside the markdown meta block.
>
> I've tried various incarnations of `{.thing}` too.
>
> Cheers,
> Indy
>

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