performance: Cache used command value

The detected command does not change once CLI2::analysis has been
performed. Cache the value of the command to avoid the need to
re-discover the correct value each time we're interested in it.

src/CLI2.cpp

@@ -523,6 +523,9 @@ void CLI2::analyze ()
   // Determine arg types: FILTER, MODIFICATION, MISCELLANEOUS.
   categorizeArgs ();
   parenthesizeOriginalFilter ();
+
+  // Cache frequently looked up items
+  _command = getCommand ();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
@@ -752,6 +755,10 @@ std::string CLI2::getBinary () const
 ////////////////////////////////////////////////////////////////////////////////
 std::string CLI2::getCommand (bool canonical) const
 {
+  // Shortcut if analysis has been finalized
+  if (_command != "")
+    return _command;
+
   for (const auto& a : _args)
     if (a.hasTag ("CMD"))
       return a.attribute (canonical ? "canonical" : "raw");

src/CLI2.h

@@ -116,7 +116,8 @@ public:
 
   std::vector <std::pair <std::string, std::string>> _id_ranges            {};
   std::vector <std::string>                          _uuid_list            {};
-  bool                                               _context_added {false};
+  std::string                                        _command            {""};
+  bool                                               _context_added   {false};
 };
 
 #endif