1 files changed, 9 insertions, 0 deletions
diff --git a/src/libutil/args.hh b/src/libutil/args.hh
index fdd036f9a..84866f12b 100644
--- a/src/libutil/args.hh
+++ b/src/libutil/args.hh
@@ -25,6 +25,8 @@ public:
     /* Return a short one-line description of the command. */
     virtual std::string description() { return ""; }
 
+    virtual bool forceImpureByDefault() { return false; }
+
     /* Return documentation about this command, in Markdown format. */
     virtual std::string doc() { return ""; }
 
@@ -146,6 +148,11 @@ protected:
        argument (if any) have been processed. */
     virtual void initialFlagsProcessed() {}
 
+    /* Called after the command line has been processed if we need to generate
+       completions. Useful for commands that need to know the whole command line
+       in order to know what completions to generate. */
+    virtual void completionHook() { }
+
 public:
 
     void addFlag(Flag && flag);
@@ -221,6 +228,8 @@ public:
 
     bool processArgs(const Strings & args, bool finish) override;
 
+    void completionHook() override;
+
     nlohmann::json toJSON() override;
 };