Failing to convert epub to pdf with typst engine.

[StructSeeker]

I am not sure if i am doing it the wrong way. With x.epub in current directory. I run

pandoc -f 'epub' -t 'pdf' -o 'x.pdf' --split-level=1 --pdf-engine=typst --standalone x.epub
error: file not found (searched at \\?\C:\Users\xxx\dir\Images\cover.jpg)
    ┌─ \\?\C:\Users\xxx\dir\toP5D8.html:133:11
    │
133 │ #box(image("Images/cover.jpg"))
    │            ^^^^^^^^^^^^^^^^^^

Error producing PDF.

Relevant Info: I am using win11 with pandoc version:

> pandoc --version
pandoc.exe 3.7.0.2
Features: +server +lua
Scripting engine: Lua 5.4
User data directory: C:\Users\StructSeeker\AppData\Roaming\pandoc
Copyright (C) 2006-2024 John MacFarlane. Web: https://pandoc.org
This is free software; see the source for copying conditions. There is no
warranty, not even for merchantability or fitness for a particular purpose.
> typst --version
typst 0.13.1 (8ace67d9)

How should i fix the problem?

[jgm]

It's hard to diagnose this without more detail. Can you upload a (redacted, simplified) version of the epub that suffices to reproduce the problem?

[StructSeeker]

It's hard to diagnose this without more detail. Can you upload a (redacted, simplified) version of the epub that suffices to reproduce the problem?
A simpified epub file can be found here among other sample epub

[StructSeeker]

It's hard to diagnose this without more detail. Can you upload a (redacted, simplified) version of the epub that suffices to reproduce the problem?

I've encountered the same problem using that sample epub in previous link.

[jgm]

The file pandoc can't find is the epub cover image. It seems there is code in the EPUB reader that is meant to ensure that this is included in the document's MediaBag:
https://github.com/jgm/pandoc/blob/main/src/Text/Pandoc/Readers/EPUB.hs#L76-L78
I'll need to investigate further to see what is going wrong here.

[jgm]

Putting a trace on links at line 106 shows images/cover.png.
It is also being found by getEntry.
I can also verify that it is in the MediaBag after l. 79.

[jgm]

Also, going to PDF via LaTeX works. So the problem is not in the EPUB reader, but (probably) T.P.PDF, the function for typst. Is it fetching things from the MediaBag?

[StructSeeker]

@jgm currently, the problem seem to be the typst fallback font being empty?

> pandoc -f 'epub' -t 'pdf' -o 'x.pdf' --split-level=1 --pdf-engine=typst --standalone x.epub
error: font fallback list must not be empty
   ┌─ \\?\C:\Users\struc\Downloads\toreduce\toP81A5.typ:81:17
   │
81 │            font: font,
   │                  ^^^^

help: error occurred in this call of function `conf`
    ┌─ \\?\C:\Users\struc\Downloads\toreduce\toP81A5.typ:145:14
    │
145 │   #show: doc => conf(
    │ ╭───────────────^
146 │ │   title: [A Textbook of Sources for Teachers and Teacher-Training ClassesChildren's Literature],
147 │ │   authors: (
148 │ │     ( name: [Erle Elsworth Clippinger],
    · │
159 │ │   doc,
160 │ │ )
    │ ╰─^

Error producing PDF.

Edit: The above is the error for pandoc 3.8, for current latest verison

~\Downloads\toreduce> pandoc -v
pandoc 3.9.0.2
Features: +server +lua
Scripting engine: Lua 5.4
User data directory: C:\Users\struc\AppData\Roaming\pandoc
Copyright (C) 2006-2025 John MacFarlane. Web:  https://pandoc.org
This is free software; see the source for copying conditions. There is no
warranty, not even for merchantability or fitness for a particular purpose.
~\Downloads\toreduce> pandoc -f 'epub' -t 'pdf' -o 'x.pdf' --split-level=1 --pdf-engine=typst --standalone x.epub
error: label `<nav.xhtml_toc>` does not exist in the document
    ┌─ \\?\C:\Users\struc\Downloads\toreduce\toPFD84.typ:167:3
    │
167 │ + #link(<nav.xhtml_toc>)[Table of Contents]
    │    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: label `<s04.xhtml_s04-a01>` does not exist in the document
    ┌─ \\?\C:\Users\struc\Downloads\toreduce\toPFD84.typ:912:18
    │
912 │ detail how \"The #link(<s04.xhtml_s04-a01>)[Emperor\'s] New Clothes\"
    │                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: label `<s04.xhtml_s04-a03>` does not exist in the document
     ┌─ \\?\C:\Users\struc\Downloads\toreduce\toPFD84.typ:4497:1
     │
4497 │ #link(<s04.xhtml_s04-a03>)[Dryad] stepped quickly out.
     │  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: label `<s04.xhtml_s04-a02>` does not exist in the document
     ┌─ \\?\C:\Users\struc\Downloads\toreduce\toPFD84.typ:2365:26
     │
2365 │ Farewell, farewell, thou #link(<s04.xhtml_s04-a02>)[warrior] brave, For
     │                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Error producing PDF.

shall i post it to issue as a bug? (note that, currenly, typst don't support cross file label reference, the standard way to manage label cross-reference in multiple document is to use #document element multiple times in one file (maybe via include) and thus allow cross-document label citing.

[jgm]

It wouldn't really be a cross-file reference anyway, because just one typst document is produced. The problem is that the anchor is never being produced. You can add a bug for this.