Interpolate a value defined in metadata without a template

Interpolate a value defined in metadata without a template

[Shiwei Weng]

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Hi all,

I am new to pandoc. I am trying to render from a markdown file to a html 
file.

I wonder if it's possible to interpolate a field in the metadata e.g. 
if the meta has `foo=MY_FOO` , in the markdown I write `$(foo)` and I hope 
the result html has `MY_FOO` without using a template.

best,
Shiwei

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Re: Interpolate a value defined in metadata without a template

[William Lupton]

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I think this requires a filter. There's a very simple example at
https://pandoc.org/lua-filters.html#macro-substitution (that illustrates
how to expand '{{foo}}') and I have written my own that uses '%foo%'
syntax. I could share an outline of my filter if you like. W.

On Wed, 9 Feb 2022 at 01:55, Shiwei Weng <arbipher-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:

> Hi all,
>
> I am new to pandoc. I am trying to render from a markdown file to a html
> file.
>
> I wonder if it's possible to interpolate a field in the metadata e.g.
> if the meta has `foo=MY_FOO` , in the markdown I write `$(foo)` and I hope
> the result html has `MY_FOO` without using a template.
>
> best,
> Shiwei
>
> --
> 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
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> https://groups.google.com/d/msgid/pandoc-discuss/986f8e0f-9bf8-44ba-aae9-678315f1da94n%40googlegroups.com
> <https://groups.google.com/d/msgid/pandoc-discuss/986f8e0f-9bf8-44ba-aae9-678315f1da94n%40googlegroups.com?utm_medium=email&utm_source=footer>
> .
>

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Re: Interpolate a value defined in metadata without a template

[Joost]

On Wed, 9 Feb 2022, at 10:13, William Lupton wrote:
> I think this requires a filter. There's a very simple example at 
> https://pandoc.org/lua-filters.html#macro-substitution (that 
> illustrates how to expand '{{foo}}') and I have written my own that 
> uses '%foo%' syntax. I could share an outline of my filter if you like. 
> W.

FWIW this example filter may be even better:

https://pandoc.org/lua-filters.html#replacing-placeholders-with-their-metadata-value

Since it seems to discuss the OP's exact use case: fill in place holders with information from the metadata.

-- 
Joost Kremers
Life has its moments

Re: Interpolate a value defined in metadata without a template

[William Lupton]

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Oops yes, definitely! I forgot about that one (which is probably what
caused me to use '%' for my filter!). Sorry for the spam...

On Wed, 9 Feb 2022 at 09:20, Joost <joostkremers-97jfqw80gc6171pxa8y+qA@public.gmane.org> wrote:

> On Wed, 9 Feb 2022, at 10:13, William Lupton wrote:
> > I think this requires a filter. There's a very simple example at
> > https://pandoc.org/lua-filters.html#macro-substitution (that
> > illustrates how to expand '{{foo}}') and I have written my own that
> > uses '%foo%' syntax. I could share an outline of my filter if you like.
> > W.
>
> FWIW this example filter may be even better:
>
>
> https://pandoc.org/lua-filters.html#replacing-placeholders-with-their-metadata-value
>
> Since it seems to discuss the OP's exact use case: fill in place holders
> with information from the metadata.
>
> --
> Joost Kremers
> Life has its moments
>
> --
> You received this message because you are subscribed to the Google Groups
> "pandoc-discuss" group.
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> https://groups.google.com/d/msgid/pandoc-discuss/525b4bf5-4db1-4040-baaf-b4fea3be6a01%40www.fastmail.com
> .
>

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Re: Interpolate a value defined in metadata without a template

[Shiwei Weng]

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Thank you all. I will try it later.

I thought the pandoc was similar to Jekyll that I could do templating 
things in the input markdown (and having both HTML and pdf results).
Now I see it.

It seems I may also need lua-filter's helps if I would do loop for lists in 
meta block e.g. ${foo (list-in-meta)} 
<https://pandoc.org/MANUAL.html#for-loops> .



On Wednesday, February 9, 2022 at 4:36:02 AM UTC-5 William Lupton wrote:

> Oops yes, definitely! I forgot about that one (which is probably what 
> caused me to use '%' for my filter!). Sorry for the spam...
>
> On Wed, 9 Feb 2022 at 09:20, Joost <joostk...-97jfqw80gc6171pxa8y+qA@public.gmane.org> wrote:
>
>> On Wed, 9 Feb 2022, at 10:13, William Lupton wrote:
>> > I think this requires a filter. There's a very simple example at 
>> > https://pandoc.org/lua-filters.html#macro-substitution (that 
>> > illustrates how to expand '{{foo}}') and I have written my own that 
>> > uses '%foo%' syntax. I could share an outline of my filter if you like. 
>> > W.
>>
>> FWIW this example filter may be even better:
>>
>>
>> https://pandoc.org/lua-filters.html#replacing-placeholders-with-their-metadata-value
>>
>> Since it seems to discuss the OP's exact use case: fill in place holders 
>> with information from the metadata.
>>
>> -- 
>> Joost Kremers
>> Life has its moments
>>
>> -- 
>> 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-discus...-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
>>
> To view this discussion on the web visit 
>> https://groups.google.com/d/msgid/pandoc-discuss/525b4bf5-4db1-4040-baaf-b4fea3be6a01%40www.fastmail.com
>> .
>>
>

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AW: Interpolate a value defined in metadata without a template

[denis.maier-NSENcxR/0n0]

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Von: pandoc-discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org <pandoc-discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org> Im Auftrag von Shiwei Weng
Gesendet: Mittwoch, 9. Februar 2022 15:47
An: pandoc-discuss <pandoc-discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org>
Betreff: Re: Interpolate a value defined in metadata without a template

Thank you all. I will try it later.

I thought the pandoc was similar to Jekyll that I could do templating things in the input markdown (and having both HTML and pdf results).
Now I see it.



There are also preprocessors that do such things.

Denis

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Re: Interpolate a value defined in metadata without a template

[Shiwei Weng]

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I found this discussed in one github 
[issue](https://github.com/jgm/pandoc/issues/1950#issuecomment-74613325) 
with the example provided by jgm

```shell
% pandoc my.md --template my.md | pandoc -t html
<p>Hello world.</p>
```

On Wednesday, February 9, 2022 at 9:49:32 AM UTC-5 denis...-NSENcxR/0n0@public.gmane.org wrote:

>  
>
> *Von:* pandoc-...-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org <pandoc-...-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org> *Im 
> Auftrag von *Shiwei Weng
> *Gesendet:* Mittwoch, 9. Februar 2022 15:47
> *An:* pandoc-discuss <pandoc-...-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org>
> *Betreff:* Re: Interpolate a value defined in metadata without a template
>
>  
>
> Thank you all. I will try it later.
>
> I thought the pandoc was similar to Jekyll that I could do templating 
> things in the input markdown (and having both HTML and pdf results).
>
> Now I see it.
>
>  
>
>  
>
>  
>
> There are also preprocessors that do such things. 
>
>  
>
> Denis
>

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