* Started implementing the new evaluation model.

* Lots of refactorings.
* Unit tests.

src/values.hh

@@ -0,0 +1,24 @@
+#ifndef __VALUES_H
+#define __VALUES_H
+
+#include <string>
+
+#include "hash.hh"
+
+using namespace std;
+
+
+/* Copy a value to the nixValues directory and register it in dbRefs.
+   Return the hash code of the value. */
+Hash addValue(string pathName);
+
+
+/* Obtain the path of a value with the given hash.  If a file with
+   that hash is known to exist in the local file system (as indicated
+   by the dbRefs database), we use that.  Otherwise, we attempt to
+   fetch it from the network (using dbNetSources).  We verify that the
+   file has the right hash. */
+string queryValuePath(Hash hash);
+
+
+#endif /* !__VALUES_H */