# Builder for depot-internal Emacs packages. Packages built using this
# builder are added into the Emacs packages fixpoint under
# `emacsPackages.tvlPackages`, which in turn makes it possible to use
# them with special Emacs features like native compilation.
#
# Arguments passed to the builder are the same as
# emacsPackages.trivialBuild, except:
#
# * packageRequires is not used
#
# * externalRequires takes a selection function for packages from
#   emacsPackages
#
# * internalRequires takes other depot packages
{ pkgs, ... }:

buildArgs:

pkgs.callPackage({ emacsPackages }:

let
  # Select external dependencies from the emacsPackages set
  externalDeps = (buildArgs.externalRequires or (_: [])) emacsPackages;

  # Override emacsPackages for depot-internal packages
  internalDeps = map (p: p.override { inherit emacsPackages; })
                     (buildArgs.internalRequires or []);

  trivialBuildArgs = builtins.removeAttrs buildArgs [
    "externalRequires" "internalRequires"
  ] // {
    packageRequires = externalDeps ++ internalDeps;
  };
in emacsPackages.trivialBuild trivialBuildArgs) {}