customize to handle image not exists

customize to handle image not exists

[jiewuza]

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I use pandoc to convert html to pdf with my personal latex documentclass, in which images not exists would be replaced with boxes.

For
```
<img src="not-exists.jpg">
```
if I convert it to latex first, and then to pdf, everything works as expected.

But if I convert it to pdf directly, pandoc reports a warning: could not fetch resource, replacing image with description.

I hope it does what the "html->latex->pdf" process did, without checking the resource. Is this customizable?

-- 

Re: customize to handle image not exists

[John MacFarlane]

No, it isn't customizable.

> On Mar 29, 2023, at 9:12 PM, jiewuza <jiewuza-9Onoh4P/yGk@public.gmane.org> wrote:
> 
> I use pandoc to convert html to pdf with my personal latex documentclass, in which images not exists would be replaced with boxes.
> 
> For
> ```
> <img src="not-exists.jpg">
> ```
> if I convert it to latex first, and then to pdf, everything works as expected.
> 
> But if I convert it to pdf directly, pandoc reports a warning: could not fetch resource, replacing image with description.
> 
> I hope it does what the "html->latex->pdf" process did, without checking the resource. Is this customizable?
> 
> -- 
> 
> 
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Re: customize to handle image not exists

[jiewuza]

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Well, I am still confused about the difference between the two processes. 

In the process "html->latex->pdf",  I use pandoc to convert html to latex first, and call latex engine to produce pdf manually. While in the process "html->pdf", pandoc
does everything by itself. 

I passed the same cli parameters to pandoc during the two processes. The final pdfs are all the same except for the non-existing images. So I guess in "html->pdf" it also generates latex temporary file first before producing pdf, right?
If the answer is yes, it seems an inconsistent behavior of pandoc treating resources, which could surprise users.
IMHO, a warning is enough, but do not modify the content by replacing image with description.

BTW, I did not see the description in the pdf for the non-existing image. Is it a bug?


-- 


John MacFarlane <fiddlosopher-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 写入消息新闻:
> No, it isn't customizable.
> 
>> On Mar 29, 2023, at 9:12 PM, jiewuza <jiewuza-9Onoh4P/yGk-XMD5yJDbdMSQIYZ4X/+iSw@public.gmane.orgrg> wrote:

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Re: customize to handle image not exists

[John MacFarlane]

> On Mar 30, 2023, at 7:51 PM, jiewuza <jiewuza-9Onoh4P/yGk@public.gmane.org> wrote:
> 
> Well, I am still confused about the difference between the two processes. 
> 
> In the process "html->latex->pdf",  I use pandoc to convert html to latex first, and call latex engine to produce pdf manually. While in the process "html->pdf", pandoc
> does everything by itself. 
> 
> I passed the same cli parameters to pandoc during the two processes. The final pdfs are all the same except for the non-existing images. So I guess in "html->pdf" it also generates latex temporary file first before producing pdf, right?

Yes.

> If the answer is yes, it seems an inconsistent behavior of pandoc treating resources, which could surprise users.
> IMHO, a warning is enough, but do not modify the content by replacing image with description.

Well, then the latex process would raise an error, without special custom handling (as you seem to have). I think current behavior is better.

> 
> BTW, I did not see the description in the pdf for the non-existing image. Is it a bug?

Maybe there was no alt text in the input?

Re: customize to handle image not exists

[jiewuza]

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You are right. I removed "alt" in my filter.

But replacing images with description quietly could result in an unwanted document if people neglect the warning and do not check the documeng carefully.
So IMHO an error without generating the document is better, as people definitely would notice the warning and error what are missing. And an option to enable this raplacing behavior would be even better, since people know and agree what may happen when they set it.

-- 


John MacFarlane <fiddlosopher-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 写入消息新闻:
> 
> 
>> On Mar 30, 2023, at 7:51 PM, jiewuza <jiewuza-9Onoh4P/yGk-XMD5yJDbdMSQIYZ4X/+iSw@public.gmane.orgrg> wrote:
>> 
>> Well, I am still confused about the difference between the two processes. 

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