ENH: support bzip2 compression for foamPack*

bin/foamPackBin

@@ -59,6 +59,7 @@ cat <<USAGE 1>&2
 Usage: ${0##*/} [OPTION] <archOptions>
        ${0##*/} [OPTION] -current
 options:
+  -b, -bzip2            use bzip2 instead of gzip compression
   -c, -current          use current value of \$WM_OPTIONS
   -o, -output <dir>     specify alternative output directory
 
@@ -73,6 +74,7 @@ USAGE
 
 
 unset archOptions outputDir
+packExt=tgz
 
 # parse options
 while [ "$#" -gt 0 ]
@@ -81,6 +83,10 @@ do
     -h | -help)
         usage
         ;;
+    -b | -bzip2)
+        packExt=tbz
+        shift
+        ;;
     -c | -current)      # use $WM_OPTIONS - eg, 'linux64GccDPOpt'
         archOptions="$WM_OPTIONS"
         shift
@@ -110,7 +116,6 @@ fi
 
 #------------------------------------------------------------------------------
 timeStamp=$(date +%Y-%m-%d)
-packExt=tgz
 packBase=${packDir}.${archOptions}_${timeStamp}
 
 # add optional output directory
@@ -137,11 +142,20 @@ else
     exit 1
 fi
 
+# bzip2 or gzip compression
+case "$packFile" in
+*tbz)
+    tarOpt=cpjf
+    ;;
+*)
+    tarOpt=cpzf
+    ;;
+esac
 
 # Clean up on Ctrl-C
 trap 'rm -f $packFile 2>/dev/null' INT
 
-tar cpzf $packFile $dirList
+tar $tarOpt $packFile $dirList
 if [ $? -eq 0 ]
 then
     echo "Finished packing file $packFile" 1>&2