push sheeet

pkgs/development/compilers/chicken/4/fetchegg/builder.sh

@@ -0,0 +1,5 @@
+echo "exporting egg ${eggName} (version $version) into $out"
+
+mkdir -p $out
+chicken-install -r "${eggName}:${version}"
+cp -r ${eggName}/* $out/

pkgs/development/compilers/chicken/4/fetchegg/default.nix

@@ -0,0 +1,33 @@
+# Fetches a chicken egg from henrietta using `chicken-install -r'
+# See: http://wiki.call-cc.org/chicken-projects/egg-index-4.html
+
+{
+  lib,
+  stdenvNoCC,
+  chicken,
+}:
+{
+  name,
+  version,
+  md5 ? "",
+  sha256 ? "",
+}:
+
+if md5 != "" then
+  throw "fetchegg does not support md5 anymore, please use sha256"
+else
+  stdenvNoCC.mkDerivation {
+    name = "chicken-${name}-export-${version}";
+    builder = ./builder.sh;
+    nativeBuildInputs = [ chicken ];
+
+    outputHashAlgo = "sha256";
+    outputHashMode = "recursive";
+    outputHash = sha256;
+
+    inherit version;
+
+    eggName = name;
+
+    impureEnvVars = lib.fetchers.proxyImpureEnvVars;
+  }