push sheeet

pkgs/top-level/pkg-config/defaultPkgConfigPackages.nix

@@ -0,0 +1,48 @@
+/*
+  A set of aliases to be used in generated expressions.
+
+  In case of ambiguity, this will pick a sensible default.
+
+  This was initially based on cabal2nix's mapping.
+
+  It'd be nice to generate this mapping, based on a set of derivations.
+  It can not be fully automated, so it should be a expression or tool
+  that makes suggestions about which pkg-config module names can be added.
+*/
+pkgs:
+
+let
+  inherit (pkgs) lib;
+  inherit (lib)
+    all
+    flip
+    mapAttrs
+    mapAttrsToList
+    getAttrFromPath
+    importJSON
+    ;
+
+  data = importJSON ./pkg-config-data.json;
+  inherit (data) modules;
+
+  platform = pkgs.stdenv.hostPlatform;
+
+  isSupported =
+    moduleData:
+    moduleData ? supportedWhenPlatformAttrsEqual
+    -> all (x: x) (
+      mapAttrsToList (
+        k: v: platform ? ${k} && platform.${k} == v
+      ) moduleData.supportedWhenPlatformAttrsEqual
+    );
+
+  modulePkgs = flip mapAttrs modules (
+    _moduleName: moduleData:
+    if moduleData ? attrPath && isSupported moduleData then
+      getAttrFromPath moduleData.attrPath pkgs
+    else
+      null
+  );
+
+in
+modulePkgs