Lua filters: accessing Images's 'fig:' attribute?

Lua filters: accessing Images's 'fig:' attribute?

[Julien Dutant]

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Hi,

Pandoc's markdown `implicit_figures` extension parses blocks consisting of 
a single image as figures. This shows up in the `native` output as `fig:` 
attribute after the source. Compare without caption:

% pandoc -t native

![](file.jpg)

[ Para [ Image ( "" , [] , [] ) [] ( "file.jpg" , "" ) ] ]
And with:

![caption](file.jpg)

[ Para
    [ Image
        ( "" , [] , [] ) [ Str "caption" ] ( "file.jpg" , "fig:" )
    ]
]
We can't look up this attribute in Lua filters. Any reason not too? Is it 
not part of the Pandoc AST, or doesn't fit neatly in current Lua types? 

I'd like my filter to be aware of whether an image is treated as figure or 
inline (e.g., to wrap the latter, but not the former, in a LaTeX center 
environment). Perhaps others need this too. Atm my best bet is to redo 
Pandoc's figure detection, i.e. (a) check if we're reading from markdown 
with the implicit_headers extension,  (b) filter Para elements looking if 
they contain only one Image with caption and if so tag it with some 
`.is-a-figure` class, and then (c) make my Image filter aware of the 
`.is-a-figure` class, and perhaps (d) clean up by removing the class. 

J

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Re: Lua filters: accessing Images's 'fig:' attribute?

[William Lupton]

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I think that the 'fig:' goes into the image's title attribute?

On Tue, 26 Apr 2022 at 18:42, Julien Dutant <julien.dutant-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:

> Hi,
>
> Pandoc's markdown `implicit_figures` extension parses blocks consisting of
> a single image as figures. This shows up in the `native` output as `fig:`
> attribute after the source. Compare without caption:
>
> % pandoc -t native
>
> ![](file.jpg)
>
> [ Para [ Image ( "" , [] , [] ) [] ( "file.jpg" , "" ) ] ]
> And with:
>
> ![caption](file.jpg)
>
> [ Para
>     [ Image
>         ( "" , [] , [] ) [ Str "caption" ] ( "file.jpg" , "fig:" )
>     ]
> ]
> We can't look up this attribute in Lua filters. Any reason not too? Is it
> not part of the Pandoc AST, or doesn't fit neatly in current Lua types?
>
> I'd like my filter to be aware of whether an image is treated as figure or
> inline (e.g., to wrap the latter, but not the former, in a LaTeX center
> environment). Perhaps others need this too. Atm my best bet is to redo
> Pandoc's figure detection, i.e. (a) check if we're reading from markdown
> with the implicit_headers extension,  (b) filter Para elements looking if
> they contain only one Image with caption and if so tag it with some
> `.is-a-figure` class, and then (c) make my Image filter aware of the
> `.is-a-figure` class, and perhaps (d) clean up by removing the class.
>
> J
>
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> .
>

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Re: Lua filters: accessing Images's 'fig:' attribute?

[jmuc...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org]

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Some discussion on a similar issue (not showing the fig label in beamer 
while keeping the image centered) in the GitHub repo issues here 
<https://github.com/jgm/pandoc/issues/7988>.

I don't write too many filters, but isn't the "fig." bit stored in 
`img.title` for lua?
On Tuesday, 26 April 2022 at 13:41:57 UTC-4 Julien Dutant wrote:

> Hi,
>
> Pandoc's markdown `implicit_figures` extension parses blocks consisting of 
> a single image as figures. This shows up in the `native` output as `fig:` 
> attribute after the source. Compare without caption:
>
> % pandoc -t native
>
> ![](file.jpg)
>
> [ Para [ Image ( "" , [] , [] ) [] ( "file.jpg" , "" ) ] ]
> And with:
>
> ![caption](file.jpg)
>
> [ Para
>     [ Image
>         ( "" , [] , [] ) [ Str "caption" ] ( "file.jpg" , "fig:" )
>     ]
> ]
> We can't look up this attribute in Lua filters. Any reason not too? Is it 
> not part of the Pandoc AST, or doesn't fit neatly in current Lua types? 
>
> I'd like my filter to be aware of whether an image is treated as figure or 
> inline (e.g., to wrap the latter, but not the former, in a LaTeX center 
> environment). Perhaps others need this too. Atm my best bet is to redo 
> Pandoc's figure detection, i.e. (a) check if we're reading from markdown 
> with the implicit_headers extension,  (b) filter Para elements looking if 
> they contain only one Image with caption and if so tag it with some 
> `.is-a-figure` class, and then (c) make my Image filter aware of the 
> `.is-a-figure` class, and perhaps (d) clean up by removing the class. 
>
> J
>

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Re: Lua filters: accessing Images's 'fig:' attribute?

[Julien Dutant]

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Thanks both, you're right, I missed that: this is actually the title field. 

![caption](file.jpg 'mytitle')

[ Para
    [ Image
        ( "" , [] , [] ) [ Str "caption" ] ( "file.jpg" , "fig:mytitle" )
    ]
]
in Lua, "if img.title:match('^fig:') then..." is all that's needed to check 
that it's a figure. That's very helpful and good news, thanks!

J

On Tuesday, April 26, 2022 at 8:03:41 PM UTC+1 jmuc...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org wrote:

> Some discussion on a similar issue (not showing the fig label in beamer 
> while keeping the image centered) in the GitHub repo issues here 
> <https://github.com/jgm/pandoc/issues/7988>.
>
> I don't write too many filters, but isn't the "fig." bit stored in 
> `img.title` for lua?
> On Tuesday, 26 April 2022 at 13:41:57 UTC-4 Julien Dutant wrote:
>
>> Hi,
>>
>> Pandoc's markdown `implicit_figures` extension parses blocks consisting 
>> of a single image as figures. This shows up in the `native` output as 
>> `fig:` attribute after the source. Compare without caption:
>>
>> % pandoc -t native
>>
>> ![](file.jpg)
>>
>> [ Para [ Image ( "" , [] , [] ) [] ( "file.jpg" , "" ) ] ]
>> And with:
>>
>> ![caption](file.jpg)
>>
>> [ Para
>>     [ Image
>>         ( "" , [] , [] ) [ Str "caption" ] ( "file.jpg" , "fig:" )
>>     ]
>> ]
>> We can't look up this attribute in Lua filters. Any reason not too? Is it 
>> not part of the Pandoc AST, or doesn't fit neatly in current Lua types? 
>>
>> I'd like my filter to be aware of whether an image is treated as figure 
>> or inline (e.g., to wrap the latter, but not the former, in a LaTeX center 
>> environment). Perhaps others need this too. Atm my best bet is to redo 
>> Pandoc's figure detection, i.e. (a) check if we're reading from markdown 
>> with the implicit_headers extension,  (b) filter Para elements looking if 
>> they contain only one Image with caption and if so tag it with some 
>> `.is-a-figure` class, and then (c) make my Image filter aware of the 
>> `.is-a-figure` class, and perhaps (d) clean up by removing the class. 
>>
>> J
>>
>

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