Allow selecting derivation outputs using 'installable!outputs'

E.g. 'nixpkgs#glibc^dev,static' or 'nixpkgs#glibc^*'.

1 files changed, 16 insertions, 0 deletions

diff --git a/src/libstore/path-with-outputs.cc b/src/libstore/path-with-outputs.cc
index 078c117bd..7d180a0f6 100644
--- a/src/libstore/path-with-outputs.cc
+++ b/src/libstore/path-with-outputs.cc
@@ -1,6 +1,8 @@
 #include "path-with-outputs.hh"
 #include "store-api.hh"
 
+#include <regex>
+
 namespace nix {
 
 std::string StorePathWithOutputs::to_string(const Store & store) const
@@ -68,4 +70,18 @@ StorePathWithOutputs followLinksToStorePathWithOutputs(const Store & store, std:
     return StorePathWithOutputs { store.followLinksToStorePath(path), std::move(outputs) };
 }
 
+std::pair<std::string, OutputsSpec> parseOutputsSpec(const std::string & s)
+{
+    static std::regex regex(R"((.*)\^((\*)|([a-z]+(,[a-z]+)*)))");
+
+    std::smatch match;
+    if (!std::regex_match(s, match, regex))
+        return {s, DefaultOutputs()};
+
+    if (match[3].matched)
+        return {match[1], AllOutputs()};
+
+    return {match[1], tokenizeString<OutputNames>(match[4].str(), ",")};
+}
+
 }