* Working evaluator.

* Mutually recursive attribute sets.
* Print evaluator efficiency statistics.

src/fix-ng/primops.hh

@@ -0,0 +1,22 @@
+#ifndef __PRIMOPS_H
+#define __PRIMOPS_H
+
+#include "eval.hh"
+
+
+/* Load and evaluate an expression from path specified by the
+   argument. */ 
+Expr primImport(EvalState & state, Expr arg);
+
+
+/* Construct (as a unobservable) side effect) a Nix derivation
+   expression that performs the derivation described by the argument
+   set.  Returns the original set extended with the following
+   attributes: `outPath' containing the primary output path of the
+   derivation; `drvPath' containing the path of the Nix expression;
+   and `type' set to `derivation' to indicate that this is a
+   derivation. */
+Expr primDerivation(EvalState & state, Expr args);
+
+
+#endif /* !__PRIMOPS_H */