PDF of slide output has a few style problems

chirun-ncl / chirun

A Python package providing the command line interface for building flexible and accessible content with Chirun.

https://chirun.org.uk/

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PDF of slide output has a few style problems #186

Closed chrismgraham closed 9 months ago

chrismgraham commented 9 months ago

The PDF looks quite different from the slides. The main things are:

The font is quite a lot smaller than the slides view itself
There's no margin on the page, so the very top headings (name / item title) are pressed right to the edge of the document
Runnable code seems to lose its formatting, although standard code blocks seem OK
My maths equations seem to use white font, so disappear from the document on a white background

christianp commented 9 months ago

The text is indeed smaller, and I can't see why. In print preview in both Chrome and Firefox, it looks OK.

I don't think the maths is white, I think the fonts hadn't loaded at the point the PDF was saved. Last week I put in a check to wait for MathJax to finish, but clearly not a robust one!

I guess the problem with runnable code is that the custom element hasn't loaded. More stuff to wait for!

chrismgraham commented 9 months ago

That makes more sense regarding the maths!

christianp commented 9 months ago

Ahh, the code to render markdown slides to PDF is duplicated, and I didn't add the mathjax code to that!

christianp commented 9 months ago

The runnable code custom element doesn't run because the page is loaded with file://. Now, do we run pyppeteer with security off, or do we start a web server?

christianp commented 9 months ago

Turns out pyppeteer is fixed to use a really old version of Chromium which doesn't support the null coalescing operator ??, among other things. Forcing it to use the latest revision with PYPPETEER_CHROMIUM_REVISION=1181205.

You have to have that environment variable set when you run pyppeteer-install, and then whenever you run chirun. For the docker image, we'll need to take the chromium version as a build arg and then set it as an environment variable in the Dockerfile.