pkgs: let /* Building an engine or out-of-tree mod is very similar, but different enough not to be able to build them with the same package definition, so instaed we define what is common between them in a separate file. Although `callPackage` could be used, it would require undoing `makeOverridable`, because `common.nix` does not define a package, but just an attribute set, which is directly passed as part of the argument to the engines and mods `callPackage`, so either the attributes added by `makeOverridable` have to be removed or the engine and mod package definitions will need to add `...` to the argument list. */ common = let f = import ./common.nix; in f (builtins.intersectAttrs (builtins.functionArgs f) pkgs // { lua = pkgs.lua5_1; # It is not necessary to run the game, but it is nicer to be given an error dialog in the case of failure, # rather than having to look to the logs why it is not starting. inherit (pkgs.gnome) zenity; }); /* Building a set of engines or mods requires some dependencies as well, so the sets will actually be defined as a function instead, requiring the dependencies and returning the actual set. Not all dependencies for defining a engine or mod set are shared, so additional arguments can be passed as well. The builders for engines and mods allow to delay specifying the name, by returning a function that expects a name, which we use, in this case, to base the name on the attribute name instead, preventing the need to specify the name twice if the attribute name and engine/mod name are equal. */ buildOpenRASet = f: args: builtins.mapAttrs (name: value: if builtins.isFunction value then value name else value) (f ({ inherit (pkgs) fetchFromGitHub; postFetch = '' sed -i 's/curl/curl --insecure/g' $out/thirdparty/{fetch-thirdparty-deps,noget}.sh $out/thirdparty/fetch-thirdparty-deps.sh ''; } // args)); in rec { # The whole attribute set is destructered to ensure those (and only those) attributes are given # and to provide defaults for those that are optional. buildOpenRAEngine = { name ? null, version, description, homepage, mods, src, installExperimental ? "" }@engine: # Allow specifying the name at a later point if no name has been given. let builder = name: pkgs.callPackage ./engine.nix (common // { engine = engine // { inherit name installExperimental; }; }); in if name == null then builder else builder name; # See `buildOpenRAEngine`. buildOpenRAMod = { name ? null, version, title, description, homepage, src, engine }@mod: ({ version, mods ? [], src }@engine: let builder = name: pkgs.callPackage ./mod.nix (common // { mod = mod // { inherit name; }; engine = engine // { inherit mods; }; }); in if name == null then builder else builder name) engine; # See `buildOpenRASet`. engines = buildOpenRASet (import ./engines.nix) { inherit buildOpenRAEngine; }; mods = buildOpenRASet (import ./mods.nix) { inherit buildOpenRAMod; }; }