Make "nix-build -A <derivation>.<output>" do the right thing

For example, given a derivation with outputs "out", "man" and "bin":

  $ nix-build -A pkg

produces ./result pointing to the "out" output;

  $ nix-build -A pkg.man

produces ./result-man pointing to the "man" output;

  $ nix-build -A pkg.all

produces ./result, ./result-man and ./result-bin;

  $ nix-build -A pkg.all -A pkg2

produces ./result, ./result-man, ./result-bin and ./result-2.

1 files changed, 9 insertions, 0 deletions

diff --git a/src/libstore/derivations.hh b/src/libstore/derivations.hh
index 7d38e60c0fe6..6b7c3e6ab189 100644
--- a/src/libstore/derivations.hh
+++ b/src/libstore/derivations.hh
@@ -79,4 +79,13 @@ typedef std::map<Path, Hash> DrvHashes;
 
 extern DrvHashes drvHashes;
 
+/* Split a string specifying a derivation and a set of outputs
+   (/nix/store/hash-foo!out1,out2,...) into the derivation path and
+   the outputs. */
+typedef std::pair<string, std::set<string> > DrvPathWithOutputs;
+DrvPathWithOutputs parseDrvPathWithOutputs(const string & s);
+
+Path makeDrvPathWithOutputs(const Path & drvPath, std::set<string> outputs);
+
+
 }