Bug #956

- Prevent any verbose information to be printed with the 'ids', 'uuids' and
  helper subcommands.
- Unit tests.
- Precise this behavior in the man pages.

src/Context.cpp

@@ -365,6 +365,8 @@ int Context::dispatch (std::string &out)
   {
     updateXtermTitle ();
 
+    updateVerbosity ();
+
     Command* c = commands[command];
 
     // GC is invoked prior to running any command that displays task IDs, if
@@ -688,6 +690,23 @@ void Context::updateXtermTitle ()
   }
 }
 
+////////////////////////////////////////////////////////////////////////////////
+// This function allows a clean output if the command is a helper subcommand or
+// a command aimed at being used by an external script.
+void Context::updateVerbosity ()
+{
+  std::string command;
+  a3.find_command (command);
+
+  if (command[0] == '_'  ||
+      command == "ids"   ||
+      command == "uuids")
+  {
+    verbosity.clear ();
+    verbosity.push_back ("nothing");
+  }
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 void Context::header (const std::string& input)
 {