Conditionally setting image in Header in PDF

[Patrick Ben Koetter]

Greetings,

I'm looking for an elegant way to set which image to use in PDF headers
(running content) to indicate which classification a document has.

The simpliest, but not so elegant way I can think of is to specify a dedicated
theme, which sets the correct header like along this concept:

# theme 1
header:
    ...
        recto:
            right:
                content: image:../assets/level1.png[]
        verso:
            left:
                content: $header-recto-right-content

# theme 2
header:
    ...
        recto:
            right:
                content: image:../assets/level2.png[]
        verso:
            left:
                content: $header-recto-right-content

But that will create lots of reduncancy in the themes and only the image would
change with the classification.

Ideally I would set the classification as VAR in the document:

= My Document
:classification: level1
...

And then $SOMETHING would evaluate the condition and set the image associated
with the {classification}.

I thought a simple attribute reference
<https://github.com/asciidoctor/asciidoctor-pdf/blob/master/docs/theming-guide.adoc#attribute-references>
might work, but it won't if I do it like this:

= My Document
:classification: level1
...

header:
    ...
        recto:
            right:
                content: image:../assets/{classification}.png[]
        verso:
            left:
                content: $header-recto-right-content

However if I specify the image name as attribute, the image isn't embedded
whereas if I hardcode it, it will be.

Any ideas what I am doing wrong or a different way to do it?


TIA,

p@rick


--
[*] sys4 AG
 
https://sys4.de, [phone]
Schleißheimer Straße 26/MG,80333 München
 
Sitz der Gesellschaft: München, Amtsgericht München: HRB 199263
Vorstand: Patrick Ben Koetter, Marc Schiffbauer, Wolfgang Stief
Aufsichtsratsvorsitzender: Florian Kirstein
 

[Patrick Ben Koetter]

Anyone?

The documentation at
https://github.com/asciidoctor/asciidoctor-pdf/blob/master/docs/theming-guide.adoc#attribute-references
says:

    "You can use any attribute defined in your AsciiDoc document (such as
    doctitle) in the content of the running header and footer. In addition,
    the following attributes are also available when defining the content keys
    in the footer:"

This is what I have done, but it doesn't work for me.

If I set ":classification: vsnfd" in my AsciiDoc document asciidoctor-pdf
won't use the variable when it renders the document. If I specify attribute
and name on the command line like this "asciidoctor-pdf -v -w -a
classification=vsnfd example.adoc" it doesn't work either.

The moment I hardcode it in my style YML file the image will be embedded into
the PDF:

header:
  height: 2cm
  border-width: 0
  image-vertical-align: 2 # # (1)
  padding: [50, 3, 0, 3]
  recto:
    right:
      #content: image:classification/vsnfd.png[width=100]
      content: image:classification/{classification}.png[width=100]
  verso:
    left:
      content: $header-recto-right-content

Thanks

p@rick


* Patrick Ben Koetter [via Asciidoctor :: Discussion] <[hidden email]>:

>
> = My Document
> :classification: level1
> ...
>
> And then $SOMETHING would evaluate the condition and set the image associated
> with the {classification}.
>
> I thought a simple attribute reference
> <https://github.com/asciidoctor/asciidoctor-pdf/blob/master/docs/theming-guide.adoc#attribute-references>
> might work, but it won't if I do it like this:
>
> = My Document
> :classification: level1
> ...
>
> header:
>     ...
>         recto:
>             right:
>                 content: image:../assets/{classification}.png[]
>         verso:
>             left:
>                 content: $header-recto-right-content
>
> However if I specify the image name as attribute, the image isn't embedded
> whereas if I hardcode it, it will be.
>
> Any ideas what I am doing wrong or a different way to do it?
>
>
> TIA,
>
> p@rick
>
>
> --
> [*] sys4 AG
>  
> https://sys4.de, [phone]
> Schleißheimer Straße 26/MG,80333 München
>  
> Sitz der Gesellschaft: München, Amtsgericht München: HRB 199263
> Vorstand: Patrick Ben Koetter, Marc Schiffbauer, Wolfgang Stief
> Aufsichtsratsvorsitzender: Florian Kirstein
>  
>
>
> _______________________________________________
> If you reply to this email, your message will be added to the discussion below:
> https://discuss.asciidoctor.org/Conditionally-setting-image-in-Header-in-PDF-tp7356.html
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... [show rest of quote]

--
[*] sys4 AG
 
https://sys4.de, [phone]
Schleißheimer Straße 26/MG,80333 München
 
Sitz der Gesellschaft: München, Amtsgericht München: HRB 199263
Vorstand: Patrick Ben Koetter, Marc Schiffbauer, Wolfgang Stief
Aufsichtsratsvorsitzender: Florian Kirstein