ENH: writeObjects: add flag to report registered objects

Co-authored-by: Kutalmis Bercin <kutalmis.bercin@esi-group.com>

src/functionObjects/utilities/writeObjects/writeObjects.C

@@ -58,6 +58,7 @@ Foam::functionObjects::writeObjects::writeOptionNames_
     { writeOption::NO_WRITE, "noWrite" },
     { writeOption::AUTO_WRITE, "autoWrite" },
     { writeOption::ANY_WRITE, "anyWrite" },
+    { writeOption::LOG, "log" },
 });
 
 const Foam::objectRegistry& setRegistry
@@ -99,7 +100,10 @@ Foam::functionObjects::writeObjects::writeObjects
 
 bool Foam::functionObjects::writeObjects::read(const dictionary& dict)
 {
-    functionObject::read(dict);
+    if (!functionObject::read(dict))
+    {
+        return false;
+    }
 
     if (dict.found("field"))
     {
@@ -134,6 +138,31 @@ bool Foam::functionObjects::writeObjects::execute()
 
 bool Foam::functionObjects::writeObjects::write()
 {
+    if (writeOption_ == writeOption::LOG)
+    {
+        const auto& classes = obr_.classes();
+
+        Log << "Registered objects:\n";
+
+        forAllConstIters(classes, classInfo)
+        {
+            const word& className = classInfo.key();
+            const wordHashSet& objectSet = classInfo();
+
+            Log << "    " << className << ":\n";
+
+            for (const auto& objectName : objectSet)
+            {
+                Log << "        " << objectName << "\n";
+            }
+            Log << nl;
+        }
+
+        Log << endl;
+
+        return true;
+    }
+
     Log << type() << " " << name() << " write:" << nl;
 
     if (!obr_.time().writeTime())

src/functionObjects/utilities/writeObjects/writeObjects.H

@@ -34,49 +34,55 @@ Description
     Allows specification of different writing frequency of objects registered
     to the database.
 
-    It has similar functionality as the main time database through the
-    \c writeControl setting:
-      - timeStep
-      - writeTime
-      - adjustableRunTime
-      - runTime
-      - clockTime
-      - cpuTime
-
-    It also has the ability to write the selected objects that were defined
-    with the respective write mode for the requested \c writeOption, namely:
-    \vartable
-        autoWrite | objects set to write at output time
-        noWrite   | objects set to not write by default
-        anyWrite  | any option of the previous two
-    \endvartable
-
 Usage
-    Example of function object specification:
+    Minimal example by using \c system/controlDict.functions:
     \verbatim
     writeObjects1
     {
-        type        writeObjects;
+        // Mandatory entries
-        libs        (utilityFunctionObjects);
+        type          writeObjects;
+        libs          (utilityFunctionObjects);
+
+        // Optional entries
+        writeOption   <word>;
+
+        // Conditional entries
+
+            // Option-1
+            field     <word>;
+
+            // Option-2
+            fields    (<wordRes>);
+
+            // Option-3
+            objects   (<wordRes>);
+
+        // Inherited entries
         ...
-        objects     (obj1 obj2);
-        writeOption anyWrite;
     }
     \endverbatim
 
-    Where the entries comprise:
+    where the entries mean:
     \table
-        Property     | Description             | Required     | Default value
+      Property   | Description               | Type | Reqd    | Deflt
-        type         | type name: writeObjects | yes          |
+      type       | Type name: writeObjects   | word | yes     | -
-        objects      | objects to write        | yes          |
+      libs       | Library name: utilityFunctionObjects | word | yes  | -
-        writeOption  | only those with this write option | no | anyWrite
+      writeOption | Select objects with the specified write mode | no | anyWrite
+      field      | Name of field to write    | word | no      | -
+      fields     | Names of fields to write  | wordRes | no   | -
+      objects    | Names of objects to write | wordRes | no   | -
     \endtable
 
-    Note: Regular expressions can also be used in \c objects.
+    Options for the \c writeOption entry:
+    \vartable
+      autoWrite | Objects set to write at output time
+      noWrite   | Objects set to not write by default
+      anyWrite  | Any option of the previous two
+      log       | Only report registered objects without writing objects
+    \endvartable
 
-See also
+    The inherited entries are elaborated in:
-    Foam::functionObject
+      - \link functionObject.H \endlink
-    Foam::functionObjects::timeControl
 
 SourceFiles
     writeObjects.C
@@ -119,9 +125,11 @@ public:
         {
             NO_WRITE,
             AUTO_WRITE,
-            ANY_WRITE
+            ANY_WRITE,
+            LOG
         };
 
+        //- Names for writeOption
         static const Enum<writeOption> writeOptionNames_;
 
 private:

tutorials/incompressible/pisoFoam/RAS/cavity/system/FOs/FOwriteObjects

@@ -0,0 +1,36 @@
+/*--------------------------------*- C++ -*----------------------------------*\
+| =========                 |                                                 |
+| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
+|  \\    /   O peration     | Version:  v2406                                 |
+|   \\  /    A nd           | Website:  www.openfoam.com                      |
+|    \\/     M anipulation  |                                                 |
+\*---------------------------------------------------------------------------*/
+
+writeObjects1
+{
+    // Mandatory entries
+    type            writeObjects;
+    libs            (utilityFunctionObjects);
+
+    // Optional entries
+    writeOption     log;
+
+    // Conditional entries
+    // field        U;
+    // fields       ( ".*" );
+    objects         ( ".*" );
+
+    // Inherited entries
+    region          region0;
+    enabled         true;
+    log             true;
+    timeStart       0;
+    timeEnd         1000;
+    executeControl  timeStep;
+    executeInterval -1;
+    writeControl    onEnd;
+    writeInterval   -1;
+}
+
+
+// ************************************************************************* //

tutorials/incompressible/pisoFoam/RAS/cavity/system/controlDict

@@ -94,6 +94,7 @@ functions
     #include "FOs/FOwallShearStress"
     #include "FOs/FOwriteCellCentres"
     #include "FOs/FOwriteCellVolumes"
+    #include "FOs/FOwriteObjects"
     #include "FOs/FOyPlus"
     #include "FOs/FOzeroGradient"
     #include "FOs/FOnorm"