1 files changed, 32 insertions, 3 deletions

diff --git a/src/nix/command.hh b/src/nix/command.hh
index 27c3ab7f2..34affc43d 100644
--- a/src/nix/command.hh
+++ b/src/nix/command.hh
@@ -11,6 +11,18 @@ struct Command : virtual Args
     virtual std::string name() = 0;
     virtual void prepare() { };
     virtual void run() = 0;
+
+    struct Example
+    {
+        std::string description;
+        std::string command;
+    };
+
+    typedef std::list<Example> Examples;
+
+    virtual Examples examples() { return Examples(); }
+
+    void printHelp(const string & programName, std::ostream & out) override;
 };
 
 class Store;
@@ -18,13 +30,30 @@ class Store;
 /* A command that require a Nix store. */
 struct StoreCommand : virtual Command
 {
-    bool reserveSpace;
-    StoreCommand(bool reserveSpace = true)
-        : reserveSpace(reserveSpace) { };
+    std::string storeUri;
+    StoreCommand();
     void run() override;
     virtual void run(ref<Store>) = 0;
 };
 
+/* A command that operates on zero or more store paths. */
+struct StorePathsCommand : public StoreCommand
+{
+private:
+
+    Paths storePaths;
+    bool recursive = false;
+    bool all = false;
+
+public:
+
+    StorePathsCommand();
+
+    virtual void run(ref<Store> store, Paths storePaths) = 0;
+
+    void run(ref<Store> store) override;
+};
+
 typedef std::map<std::string, ref<Command>> Commands;
 
 /* An argument parser that supports multiple subcommands,