CmdConfig: Extract write context validation into a separate method

src/commands/CmdContext.cpp

@@ -106,6 +106,39 @@ std::string CmdContext::joinWords (const std::vector <std::string>& words, unsig
   return value;
 }
 
+////////////////////////////////////////////////////////////////////////////////
+// Validate the context as valid for writing and fail the write context definition
+// A valid write context:
+//   - does not contain any operators except AND
+//   - does not use modifiers
+//
+// Returns True if the context is a valid write context. If the context is
+// invalid due to a wrong modifier use, the modifier string will contain the
+// first invalid modifier.
+bool CmdContext::validateWriteContext (const std::vector <A2>& lexedArgs, std::string& modifier_token)
+{
+  bool contains_or = false;
+  bool contains_modifier = false;
+
+  for (auto &arg: lexedArgs) {
+    if (arg._lextype == Lexer::Type::op)
+      if (arg.attribute ("raw") == "or")
+        contains_or = true;
+
+    if (arg._lextype == Lexer::Type::pair) {
+      auto modifier = arg.attribute ("modifier");
+      if (modifier != "" && modifier != "is" && modifier != "equals")
+      {
+        contains_modifier = true;
+        modifier_token = arg.attribute ("raw");
+        break;
+      }
+    }
+  }
+
+  return not contains_or and not contains_modifier;
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // Returns all user defined contexts.
 //
@@ -177,38 +210,14 @@ void CmdContext::defineContext (const std::vector <std::string>& words, std::str
           ! confirm (format ("The filter '{1}' matches 0 pending tasks. Do you wish to continue?", value)))
         throw std::string ("Context definition aborted.");
 
-    // Validate the context as valid for writing and fail the write context definition
+    std::string modifier_token = "";
-    // A valid write context:
+    bool valid_write_context = CmdContext::validateWriteContext (lexedArgs, modifier_token);
-    //   - does not contain any operators except AND
-    //   - does not use modifiers
-    bool contains_or = false;
-    bool contains_modifier = false;
-    std::string modifier_token;
-
-    for (auto &arg: lexedArgs) {
-      if (arg._lextype == Lexer::Type::op)
-        if (arg.attribute ("raw") == "or")
-          contains_or = true;
-
-      if (arg._lextype == Lexer::Type::pair) {
-        auto modifier = arg.attribute ("modifier");
-        if (modifier != "" && modifier != "is" && modifier != "equals")
-        {
-          contains_modifier = true;
-          modifier_token = arg.attribute ("raw");
-          out << "The modifier value is '" << modifier << "'.\n";
-          break;
-        }
-      }
-    }
-
-    bool valid_write_context = not contains_or and not contains_modifier;
 
     if (! valid_write_context)
     {
       std::stringstream warning;
       warning << format ("The filter '{1}' is not a valid modification string, because it contains ", value)
-              << ( contains_or ? "the OR operator." : format ("an attribute modifier ({1}).", modifier_token) )
+              << ( modifier_token.empty () ? "the OR operator." : format ("an attribute modifier ({1}).", modifier_token) )
               << "\nAs such, value for the write context cannot be set (context will not apply on task add / task log).\n\n"
               << format ("Please use 'task config context.{1}.write <default mods>' to set default attribute values for new tasks in this context manually.\n\n", words[1]);
       out << colorizeFootnote (warning.str ());

src/commands/CmdContext.h

@@ -29,6 +29,7 @@
 
 #include <string>
 #include <Command.h>
+#include <CLI2.h>
 
 class CmdContext : public Command
 {
@@ -36,6 +37,7 @@ public:
   CmdContext ();
   int execute (std::string&);
   std::string joinWords (const std::vector <std::string>&, unsigned int, unsigned int = 0);
+  bool validateWriteContext (const std::vector <A2>&, std::string&);
   static std::vector <std::string> getContexts ();
   void defineContext (const std::vector <std::string>&, std::stringstream&);
   void deleteContext (const std::vector <std::string>&, std::stringstream&);