Generate the release cycle chart directly as SVG by encukou · Pull Request #1034 · python/devguide

Instead of Mermaid, use jinja2. Sphinx uses jinja for templating as well,
so it might be possible to integrate this more tightly,
but an include file works nicely for now.
(It's actually easy to generate this chart just with f-strings,
but I don't want to set a bad example for people who shouldn't fully
trust their input. Jinja has autoescaping to prevent SVG injections.)

Styling is done from the main stylesheet, and is bit more straightforward.
I've adjusted the colours to be a bit friendlier to colour-blind people.

There are vertical lines for all years now -- Mermaid's skipping of
every other year was pretty confusing. Year labels have been shortened.
This should work for another 10 years.

The caption is removed; it was redundant in our case.

Precise sizing is hard to do with SVG, but the font family, size and
line height should nearly match the main text on big screens. At least
in the current theme.

In the code, `sorted_versions` is now a list, and the dicts in it have
some extra generated info.

hugovk changed the title Generate the release cycle chart directly as SVG Infra: Generate the release cycle chart directly as SVG

hugovk changed the title Infra: Generate the release cycle chart directly as SVG Generate the release cycle chart directly as SVG