dotfiles/home-manager/utils/nixGLWrap.nix

# Call once on import to load global context
{ pkgs, config }:
# Wrap a single package
pkg:
if config.nixGLPrefix == "" then
  pkg
else
  # Wrap the package's binaries with nixGL, while preserving the rest of
  # the outputs and derivation attributes.
  (pkg.overrideAttrs (old: {
    name = "nixGL-${pkg.name}";
    buildCommand = ''
      set -eo pipefail

      ${
        # Heavily inspired by https://stackoverflow.com/a/68523368/6259505
        pkgs.lib.concatStringsSep "\n" (
          map (outputName: ''
            echo "Copying output ${outputName}"
            set -x
            cp -rs --no-preserve=mode "${pkg.${outputName}}" "''$${outputName}"
            set +x
          '') (old.outputs or [ "out" ])
        )
      }

      rm -rf $out/bin/*
      shopt -s nullglob # Prevent loop from running if no files
      for file in ${pkg.out}/bin/*; do
        echo "#!${pkgs.bash}/bin/bash" > "$out/bin/$(basename $file)"
        echo "exec -a \"\$0\" ${config.nixGLPrefix} $file \"\$@\"" >> "$out/bin/$(basename $file)"
        chmod +x "$out/bin/$(basename $file)"
      done
      shopt -u nullglob # Revert nullglob back to its normal default state
    '';
  }))