Split out InstallableFlake and InstallableAttrPath

src/libcmd/installable-flake.hh

@@ -0,0 +1,50 @@
+#pragma once
+
+#include "installable-value.hh"
+
+namespace nix {
+
+struct InstallableFlake : InstallableValue
+{
+    FlakeRef flakeRef;
+    Strings attrPaths;
+    Strings prefixes;
+    ExtendedOutputsSpec extendedOutputsSpec;
+    const flake::LockFlags & lockFlags;
+    mutable std::shared_ptr<flake::LockedFlake> _lockedFlake;
+
+    InstallableFlake(
+        SourceExprCommand * cmd,
+        ref<EvalState> state,
+        FlakeRef && flakeRef,
+        std::string_view fragment,
+        ExtendedOutputsSpec extendedOutputsSpec,
+        Strings attrPaths,
+        Strings prefixes,
+        const flake::LockFlags & lockFlags);
+
+    std::string what() const override { return flakeRef.to_string() + "#" + *attrPaths.begin(); }
+
+    std::vector<std::string> getActualAttrPaths();
+
+    Value * getFlakeOutputs(EvalState & state, const flake::LockedFlake & lockedFlake);
+
+    DerivedPathsWithInfo toDerivedPaths() override;
+
+    std::pair<Value *, PosIdx> toValue(EvalState & state) override;
+
+    /* Get a cursor to every attrpath in getActualAttrPaths()
+       that exists. However if none exists, throw an exception. */
+    std::vector<ref<eval_cache::AttrCursor>>
+    getCursors(EvalState & state) override;
+
+    std::shared_ptr<flake::LockedFlake> getLockedFlake() const;
+
+    FlakeRef nixpkgsFlakeRef() const override;
+};
+
+ref<eval_cache::EvalCache> openEvalCache(
+    EvalState & state,
+    std::shared_ptr<flake::LockedFlake> lockedFlake);
+
+}