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#ifndef __NORMALISE_H
#define __NORMALISE_H
#include "storeexpr.hh"
/* Normalise a store expression. That is, if the expression is a
derivation, a path containing an equivalent closure expression is
returned. This requires that the derivation is performed, unless a
successor is known. */
Path normaliseStoreExpr(const Path & nePath, PathSet pending = PathSet());
/* Realise a closure store expression in the file system.
The pending paths are those that are already being realised. This
prevents infinite recursion for paths realised through a substitute
(since when we build the substitute, we would first try to realise
its output paths through substitutes... kaboom!). */
void realiseClosure(const Path & nePath, PathSet pending = PathSet());
/* Ensure that a path exists, possibly by instantiating it by
realising a substitute. */
void ensurePath(const Path & path, PathSet pending = PathSet());
/* Read a store expression, after ensuring its existence through
ensurePath(). */
StoreExpr storeExprFromPath(const Path & path, PathSet pending = PathSet());
/* Get the list of root (output) paths of the given store
expression. */
PathSet storeExprRoots(const Path & nePath);
/* Get the list of paths that are required to realise the given store
expression. For a derive expression, this is the union of
requisites of the inputs; for a closure expression, it is the path
of each element in the closure. If `includeExprs' is true, include
the paths of the store expressions themselves. If
`includeSuccessors' is true, include the requisites of
successors. */
PathSet storeExprRequisites(const Path & nePath,
bool includeExprs, bool includeSuccessors);
/* Return the list of the paths of all known store expressions whose
output paths are completely contained in the set `outputs'. */
PathSet findGenerators(const PathSet & outputs);
#endif /* !__NORMALISE_H */
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