#ifndef __VALUES_H
#define __VALUES_H

#include <string>

#include "hash.hh"

using namespace std;


void copyPath(string src, string dst);

/* Register a path keyed on its hash. */
Hash registerPath(const string & path, Hash hash = Hash());

/* Return a path whose contents have the given hash.  If outPath is
   not empty, ensure that such a path is realised in outPath (if
   necessary by copying from another location).  If prefix is not
   empty, only return a path that is an descendent of prefix. 

   If no path with the given hash is known to exist in the file
   system, ...
*/
string expandHash(const Hash & hash, const string & outPath = "",
    const string & prefix = "/");

/* Copy a file to the nixStore directory and register it in dbRefs.
   Return the hash code of the value. */
void addToStore(string srcPath, string & dstPath, Hash & hash);

/* Delete a value from the nixStore directory. */
void deleteFromStore(const string & path);


#endif /* !__VALUES_H */