Merge pull request #7543 from obsidiansystems/typed-string-context

Parse string context elements properly

1 files changed, 32 insertions, 0 deletions

diff --git a/src/libstore/outputs-spec.hh b/src/libstore/outputs-spec.hh
new file mode 100644
index 000000000..e2cf1d12b
--- /dev/null
+++ b/src/libstore/outputs-spec.hh
@@ -0,0 +1,32 @@
+#pragma once
+
+#include <variant>
+
+#include "util.hh"
+
+#include "nlohmann/json_fwd.hpp"
+
+namespace nix {
+
+typedef std::set<std::string> OutputNames;
+
+struct AllOutputs {
+    bool operator < (const AllOutputs & _) const { return false; }
+};
+
+struct DefaultOutputs {
+    bool operator < (const DefaultOutputs & _) const { return false; }
+};
+
+typedef std::variant<DefaultOutputs, AllOutputs, OutputNames> OutputsSpec;
+
+/* Parse a string of the form 'prefix^output1,...outputN' or
+   'prefix^*', returning the prefix and the outputs spec. */
+std::pair<std::string, OutputsSpec> parseOutputsSpec(const std::string & s);
+
+std::string printOutputsSpec(const OutputsSpec & outputsSpec);
+
+void to_json(nlohmann::json &, const OutputsSpec &);
+void from_json(const nlohmann::json &, OutputsSpec &);
+
+}