NB: The fetcher from this plugin does not automatically get used when running
nix commands (e.g. `nix build`) in a Pijul repository, since this is hardcoded
for Git and Mercurial in Nix. For this, I have a patch that adds the relevant
code for Pijul, it's available as
[nix-pijul](https://git.sr.ht/~dblsaiko/nix-extras/tree/master/item/packages/nix-pijul.nix)
in my *nix-extras* flake. It replaces the normal Nix installation and can be
used in addition to this plugin.

Add the built pijul.so module to plugin-files in nix.conf.

Add the built pijul.so module to plugin-files in nix.conf. Make sure it is built
for the Nix version you are using it with.

NixOS:

NixOS (with the nix-extras overlay):

{
  nix.settings.plugin-files = "${nix-plugin-pijul}/lib/nix/plugins/pijul.so";

{pkgs, config, ...}: {
  nix.settings.plugin-files = "${pkgs.nix-plugin-pijul.override { nix = config.nix.package; }}/lib/nix/plugins/pijul.so";
  
  # Optional: Use the patched Nix to automatically use Pijul fetcher in local
  # repositories
  nix.package = pkgs.nix-pijul;