generateSplicesForMkScope: Support dot in attribute path

  makeScopeWithSplicing' = lib.makeScopeWithSplicing' { inherit splicePackages; inherit (pkgs) newScope; };

  # generate 'otherSplices' for 'makeScopeWithSplicing'

  generateSplicesForMkScope = attr:

  generateSplicesForMkScope = attrs:

    let

      split = X: lib.splitString "." "${X}.${attr}";

      split = X: [ X ] ++ (

        if builtins.isList attrs

          then attrs

        else if builtins.isString attrs

          then lib.splitString "." attrs

        else throw "generateSplicesForMkScope must be passed a list of string or string"

      );

      bad = throw "attribute should be found";

    in

    {

      # nulls should never be reached

      selfBuildBuild = lib.attrByPath (split "pkgsBuildBuild") null pkgs;

      selfBuildHost = lib.attrByPath (split "pkgsBuildHost") null pkgs;

      selfBuildTarget = lib.attrByPath (split "pkgsBuildTarget") null pkgs;

      selfHostHost = lib.attrByPath (split "pkgsHostHost") null pkgs;

      selfHostTarget = lib.attrByPath (split "pkgsHostTarget") null pkgs;

      selfBuildBuild = lib.attrByPath (split "pkgsBuildBuild") bad pkgs;

      selfBuildHost = lib.attrByPath (split "pkgsBuildHost") bad pkgs;

      selfBuildTarget = lib.attrByPath (split "pkgsBuildTarget") bad pkgs;

      selfHostHost = lib.attrByPath (split "pkgsHostHost") bad pkgs;

      selfHostTarget = lib.attrByPath (split "pkgsHostTarget") bad pkgs;

      selfTargetTarget = lib.attrByPath (split "pkgsTargetTarget") { } pkgs;

    };