feat(tools/emacs-pkgs): Add new builder for internal packages r/2503

Adds a new internal builder that makes it possible to override the
`emacsPackages` passed to our Emacs packages, which in turn makes it
possible to inject them into the emacsPackages fixpoint and use them
with features like Emacs native compilation.

Change-Id: I80dad57115c83cf5693ae6ba4e4cf3105d103d5e
Reviewed-on: https://cl.tvl.fyi/c/depot/+/3003
Tested-by: BuildkiteCI
Reviewed-by: adisbladis <adisbladis@gmail.com>
Reviewed-by: grfn <grfn@gws.fyi>

1 files changed, 3 insertions, 5 deletions

diff --git a/tools/emacs-pkgs/tvl/default.nix b/tools/emacs-pkgs/tvl/default.nix
index d191c6b6f79e..5dcc184bb521 100644
--- a/tools/emacs-pkgs/tvl/default.nix
+++ b/tools/emacs-pkgs/tvl/default.nix
@@ -1,10 +1,8 @@
-{ pkgs, ... }:
+{ depot, ... }:
 
-with pkgs.emacsPackages;
-
-trivialBuild rec {
+depot.tools.emacs-pkgs.buildEmacsPackage {
   pname = "tvl";
   version = "1.0";
   src = ./tvl.el;
-  packageRequires = [ magit s ];
+  externalRequires = (epkgs: with epkgs; [ magit s ]);
 }