onion theme breaks with front matter

mentioned in merge request !1 (merged)

What is theme:onion here? The beamer-ahf-simple.tex file contains some macros that Pandoc absolutely assumes must be there for its Beamer template to work.

-V theme:onion is how you tell pandoc to pick a different Beamer (or else) theme. Pandoc "knows" about beamer and its themes. It will try to load beamerthemeonion.sty in the built-in template, just like you do in your template:

\usetheme{onion}

... except you don't necessarily need to hack the template to do so.

I guess my point is that the hacks you put in the beamer-ahf-simple.tex template should go in the theme directly. Because you need the theme to have the template work, why not move those into the theme and have the users deploy that instead? It would make it easier to use the theme outside of your repository, for example.

See also:

That is where I got the idea of using colortheme from, in !1 (merged), btw.

mentioned in issue #2 (closed)

This issue has been open for one week and is unlabelled

assigned to @ahf

waaat... we have a triage bot now?!

i looked into this again, and it seems this is triggered only when the title is set in the front matter.

this is the diff between a front matter with just author: anarcat and title: anarcat:

--- test.tex	2021-10-14 15:24:30.000784210 -0400
+++ test-title.tex	2021-10-14 15:23:03.081169605 -0400
@@ -76,7 +76,7 @@
 \IfFileExists{xurl.sty}{\usepackage{xurl}}{} % add URL line breaks if available
 \IfFileExists{bookmark.sty}{\usepackage{bookmark}}{\usepackage{hyperref}}
 \hypersetup{
-  pdfauthor={anarcat},
+  pdftitle={anarcat},
   hidelinks,
   pdfcreator={LaTeX via pandoc}}
 \urlstyle{same} % disable monospaced font for URLs
@@ -86,10 +86,12 @@
   \setlength{\itemsep}{0pt}\setlength{\parskip}{0pt}}
 \setcounter{secnumdepth}{-\maxdimen} % remove section numbering
 
-\author{anarcat}
+\title{anarcat}
+\author{}
 \date{}
 
 \begin{document}
+\frame{\titlepage}
 
 \begin{frame}{Slide one}
 \protect\hypertarget{slide-one}{}

it looks like it's the \frame{\titlepage} that is making latex trip all over itself. maybe we don't have the titlepage set or something?

interestingly, in the ahf template we have:

\begin{frame}[plain,noframenumbering]
    \titlepage
\end{frame}

... instead of plain \frame. so may be that's what's going on...

i should really give up on not using your template, but i can't help it! :)

interestingly, in the ahf template we have:
\begin{frame}[plain,noframenumbering]
    \titlepage
\end{frame}
... instead of plain \frame. so may be that's what's going on...

nah, using that instead of plain \frame doesn't fix the problem. so it's something inside \titlepage. probably somewhere in beamerinnerthemeonion.sty.

i managed to make it not crash with this:

modified   src/tex/beamerinnerthemeonion.sty
@@ -38,7 +38,7 @@
 %%
 \setbeamertemplate{title graphic}{%
     \vbox to 0pt {
-        \flushright\inserttitlegraphic%
+      \inserttitlegraphic%
     }
     \nointerlineskip%
 }

but somehow the logo now ends up on every page. :p still digging.

i committed that in my repo, in anarcat/onion-tex@c31ba068

to reproduce the issue, go into src/pandoc/anarcat-tpa-okrs-2021 and hit make.

mentioned in commit anarcat/onion-tex@e999e3ab

a workaround to this is to add a titlegraphic:

titlegraphic: images/color.png

so here's something super odd. i can reproduce here in Debian bullseye, with texlive-full, and the latest commit: anarcat/onion-tex@e999e3ab

but, with the exact same code, @ahf cannot.

i guess i'll have to setup CI now. :p

so i can reproduce in the texlive/texlive Docker container:

https://gitlab.torproject.org/anarcat/presentations/-/jobs/42091

it's specific to pandoc too, if I use your template i don't have that problem.

i've given up on pandoc again and used a plain tex template for now, but i'm really puzzled by those discrepancies.

Hm! I am not so sure I have the mental bandwidth for this project to also handle the templates that aren't part of this repository. Pandoc is already doing a lot of magic that took me a while to wrap my head around just to build the "simple" template that some of the slides uses in the repo.

Personally I am probably going to use the "pure" TeX variant with the onion-tex repo as a submodule much more in the future as I always end up writing more TeX than Markdown :-/ Even though this project had the exact opposite initial focus.

yeah i totally understand. do you mind if i keep this ticket open just to think out loud? maybe I'll just fix it myself eventually! :)

zero expectations from me, i'm happy if i can pick still your brain about latex once in a while though. ;)

Fine with me :-)

unassigned @ahf

assigned to @ahf

onion theme breaks with front matter

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