Before, setting {option}`programs.steam.package` would result in a steam without
the {option}`hardware.opengl.package`, {option}`hardware.opengl.extraPackages`
etc. You had to manually add them yourself.
Additionally, overlaying `steam = prev.steam.override { extraLibraries = [ ... ]; }`
resulted in those extra libraries not actually being put into the fhsenv because
they'd be fully overridden by the option's default.
Now, the user can supply a custom steam to {option}`programs.steam.package` with
its own list of extraLibraries which will not be overridden and overlays work as
expected too.
conversions were done using https://github.com/pennae/nix-doc-munge
using (probably) rev f34e145 running
nix-doc-munge nixos/**/*.nix
nix-doc-munge --import nixos/**/*.nix
the tool ensures that only changes that could affect the generated
manual *but don't* are committed, other changes require manual review
and are discarded.
the conversion procedure is simple:
- find all things that look like options, ie calls to either `mkOption`
or `lib.mkOption` that take an attrset. remember the attrset as the
option
- for all options, find a `description` attribute who's value is not a
call to `mdDoc` or `lib.mdDoc`
- textually convert the entire value of the attribute to MD with a few
simple regexes (the set from mdize-module.sh)
- if the change produced a change in the manual output, discard
- if the change kept the manual unchanged, add some text to the
description to make sure we've actually found an option. if the
manual changes this time, keep the converted description
this procedure converts 80% of nixos options to markdown. around 2000
options remain to be inspected, but most of those fail the "does not
change the manual output check": currently the MD conversion process
does not faithfully convert docbook tags like <code> and <package>, so
any option using such tags will not be converted at all.
