ENH: support writeControl 'none' (#1448)

- for special cases when normal writing is to be completely disabled
  and replaced with alternate means (eg, via a function object).

- support "adjustable" as "adjustableRunTime" alias to reduce typing
  for writeControl or outputControl

src/OpenFOAM/db/Time/Time.C

@@ -53,8 +53,7 @@ Foam::Time::stopAtControlNames
     { stopAtControls::saNoWriteNow, "noWriteNow" },
     { stopAtControls::saWriteNow, "writeNow" },
     { stopAtControls::saNextWrite, "nextWrite" },
-    // NOTE: stopAtControls::saUnknown is left untabulated here so that it can
-    // be used as fallback value to flag unknown settings
+    // Leave saUnknown untabulated - fallback to flag unknown settings
 });
 
 
@@ -64,11 +63,14 @@ const Foam::Enum
 >
 Foam::Time::writeControlNames
 ({
+    { writeControls::wcNone, "none" },
     { writeControls::wcTimeStep, "timeStep" },
     { writeControls::wcRunTime, "runTime" },
+    { writeControls::wcAdjustableRunTime, "adjustable" },
     { writeControls::wcAdjustableRunTime, "adjustableRunTime" },
     { writeControls::wcClockTime, "clockTime" },
     { writeControls::wcCpuTime, "cpuTime" },
+    // Leave wcUnknown untabulated - fallback to flag unknown settings
 });
 
 
@@ -1170,6 +1172,10 @@ Foam::Time& Foam::Time::operator++()
 
         switch (writeControl_)
         {
+            case wcNone:
+            case wcUnknown:
+            break;
+
             case wcTimeStep:
                 writeTime_ = !(timeIndex_ % label(writeInterval_));
             break;

src/OpenFOAM/db/Time/Time.H

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2016-2018 OpenCFD Ltd.
+    \\  /    A nd           | Copyright (C) 2016-2019 OpenCFD Ltd.
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
                             | Copyright (C) 2011-2017 OpenFOAM Foundation
@@ -83,11 +83,13 @@ public:
         //- Write control options
         enum writeControls
         {
+            wcNone,                 //!< "none"
             wcTimeStep,             //!< "timeStep"
             wcRunTime,              //!< "runTime"
-            wcAdjustableRunTime,    //!< "adjustableRunTime"
+            wcAdjustableRunTime,    //!< "adjustable" / "adjustableRunTime"
             wcClockTime,            //!< "clockTime"
-            wcCpuTime               //!< "cpuTime"
+            wcCpuTime,              //!< "cpuTime"
+            wcUnknown               //!< Dummy no-op
         };
 
         //- Stop-run control options, which are primarily used when

src/OpenFOAM/db/functionObjects/timeControl/timeControl.C

@@ -39,6 +39,7 @@ Foam::timeControl::timeControlNames_
     { timeControl::ocTimeStep, "timeStep" },
     { timeControl::ocWriteTime, "writeTime" },
     { timeControl::ocOutputTime, "outputTime" },
+    { timeControl::ocAdjustableRunTime, "adjustable" },
     { timeControl::ocAdjustableRunTime, "adjustableRunTime" },
     { timeControl::ocRunTime, "runTime" },
     { timeControl::ocClockTime, "clockTime" },