updated foamClearPolyMesh

* now removes the same files as Foam::polyMesh::removeFiles()
  * accepts -case option

bin/foamClearPolyMesh

@@ -27,20 +27,94 @@
 #     foamClearPolyMesh
 #
 # Description
-#     
+#    Remove the contents of the constant/polyMesh directory
+#    as per the Foam::polyMesh::removeFiles() method.
+#
 #------------------------------------------------------------------------------
+usage() {
+   while [ "$#" -ge 1 ]; do echo "$1" 1>&2; shift; done
+   cat <<USAGE 1>&2
 
-if [ -d constant/polyMesh ]; then
-    echo "there is constant/polyMesh";
-    cd constant/polyMesh
+usage: ${0##*/} [-case dir]
 
-elif [ -d polyMesh ]; then
-    echo "there is polyMesh";
-    cd polyMesh
-else
-    echo "in polyMesh directory";
+    Remove the contents of the constant/polyMesh directory
+    as per the Foam::polyMesh::removeFiles() method.
+
+USAGE
+   exit 1
+}
+
+unset caseDir
+unset meshDir
+
+# parse options
+if [ "$#" -gt 0 ]; then
+   case "$1" in
+   -h | -help)
+      usage
+      ;;
+   -case)
+      shift
+      caseDir=$1
+      [ "$#" -ge 1 ] || usage "'-case' option requires an argument"
+      cd "$caseDir" 2>/dev/null || usage "directory does not exist:  '$caseDir'"
+      meshDir="constant/polyMesh"
+      ;;
+   *)
+      usage "unknown option/argument: '$*'"
+      ;;
+   esac
 fi
 
-rm -f pointFaces pointEdges pointCells faceEdges edges edgeFaces edgeCells cellEdges cellCells owner neighbour losort faceCentres faceAreas cellVolumes cellCentres
+# meshDir is only set if -case was specified: insist upon 'constant/polyMesh'
+if [ -n "$meshDir" ]
+then
+   if [ ! -d "$meshDir" ]
+   then
+      echo "Error: no '$meshDir' in $caseDir" 1>&2
+      exit 1
+   fi
+else
+   if [ -d constant/polyMesh ]
+   then
+      # use constant/polyMesh
+      meshDir=constant/polyMesh
+   elif [ -d polyMesh ]
+   then
+      # likely already in constant/
+      meshDir=polyMesh
+   elif [ "${PWD##*/}" = polyMesh ]
+   then
+      # apparently already within polyMesh/
+      meshDir=.
+   else
+      echo "Error: no appropriate 'polyMesh/' directory found" 1>&2
+      exit 1
+   fi
+fi
+
+
+#
+# remove files and subdirectories
+#
+echo "Clearing ${caseDir:-.}/$meshDir" 1>&2
+
+for i in \
+   points \
+   faces \
+   owner \
+   neighbour \
+   cells \
+   boundary \
+   pointZones \
+   faceZones \
+   cellZones \
+   meshModifiers \
+   parallelData \
+   sets \
+;
+do
+   rm -rf $meshDir/$i
+done
 
 #------------------------------------------------------------------------------