foamDictionary: Improved parallel operation

When running in parallel the decomposed dictionary files are read from the
case directory in either un-collated or collated format and changed dictionaries
written in the form specified by the selected fileHandler.

The instance directory of the dictionary file is obtained from the file path
argument, e.g.

    mpirun -np 4 foamDictionary 0.5/U \
        -entry boundaryField.movingWall.value \
        -set "uniform (2 0 0)" -parallel

applications/utilities/miscellaneous/foamDictionary/foamDictionary.C

@@ -27,11 +27,14 @@ Application
 Description
     Interrogates and manipulates dictionaries.
 
+    Supports parallel operation for decomposed dictionary files associated with
+    a case.  These may be mesh or field files or any other decomposed
+    dictionaries.
+
 Usage
     \b foamDictionary [OPTION] dictionary
       - \par -case \<dir\>
-        Select a case directory,
-        required to process decomposed fields in parallel cases
+        Select a case directory
 
       - \par -parallel
         Specify case as a parallel job
@@ -105,7 +108,7 @@ Usage
 
       - Change bc parameter in parallel:
         \verbatim
-           mpirun -np 4 foamDictionary -case . 0/U \
+           mpirun -np 4 foamDictionary 0.5/U \
              -entry boundaryField.movingWall.value \
              -set "uniform (2 0 0)" -parallel
         \endverbatim
@@ -316,7 +319,9 @@ int main(int argc, char *argv[])
     writeInfoHeader = false;
 
     argList::addNote("manipulates dictionaries");
+
     argList::validArgs.append("dictionary file");
+
     argList::addBoolOption("keywords", "list keywords");
     argList::addOption("entry", "name", "report/select the named entry");
     argList::addBoolOption
@@ -389,7 +394,7 @@ int main(int argc, char *argv[])
         entry::disableFunctionEntries = true;
     }
 
-    const fileName dictFileName(args[1]);
+    const fileName dictPath(args[1]);
 
     Time* runTimePtr = nullptr;
     localIOdictionary* localDictPtr = nullptr;
@@ -397,9 +402,9 @@ int main(int argc, char *argv[])
     dictionary* dictPtr = nullptr;
     IOstream::streamFormat dictFormat = IOstream::ASCII;
 
-    // If the case option is specified read the dictionary as a
-    // case localIOdictionary supporting parallel operation and file handlers
-    if (args.optionFound("case"))
+    // When running in parallel read the dictionary as a case localIOdictionary
+    // supporting file handlers
+    if (Pstream::parRun())
     {
         if (!args.checkRootCase())
         {
@@ -408,6 +413,28 @@ int main(int argc, char *argv[])
 
         runTimePtr = new Time(Time::controlDictName, args);
 
+        const wordList dictPathComponents(dictPath.components());
+
+        if (dictPathComponents.size() == 1)
+        {
+            FatalErrorInFunction
+                << "File name " << dictPath
+                << " does not contain an instance path needed in parallel"
+                << exit(FatalError, 1);
+        }
+
+        const word instance = dictPathComponents[0];
+        const fileName dictFileName
+        (
+            SubList<word>(dictPathComponents, dictPathComponents.size() - 1, 1)
+        );
+
+        scalar time;
+        if (readScalar(instance.c_str(), time))
+        {
+            runTimePtr->setTime(time, 0);
+        }
+
         const word oldTypeName = localIOdictionary::typeName;
         const_cast<word&>(localIOdictionary::typeName) = word::null;
 
@@ -416,6 +443,7 @@ int main(int argc, char *argv[])
             IOobject
             (
                 dictFileName,
+                instance,
                 *runTimePtr,
                 IOobject::MUST_READ,
                 IOobject::NO_WRITE,
@@ -428,7 +456,7 @@ int main(int argc, char *argv[])
     else
     {
         dictPtr = new dictionary;
-        dictFormat = readDict(*dictPtr, dictFileName);
+        dictFormat = readDict(*dictPtr, dictPath);
     }
 
     dictionary& dict = localDictPtr ? *localDictPtr : *dictPtr;
@@ -442,7 +470,7 @@ int main(int argc, char *argv[])
     else if (args.optionFound("expand"))
     {
         IOobject::writeBanner(Info)
-            <<"//\n// " << dictFileName << "\n//\n";
+            <<"//\n// " << dictPath << "\n//\n";
         dict.dictionary::write(Info, false);
         IOobject::writeDivider(Info);
 
@@ -656,7 +684,7 @@ int main(int argc, char *argv[])
         }
         else if (dictPtr)
         {
-            OFstream os(dictFileName, dictFormat);
+            OFstream os(dictPath, dictFormat);
             IOobject::writeBanner(os);
             dictPtr->write(os, false);
             IOobject::writeEndDivider(os);