wmake: add "dwim" target

dwim (do what I mean): search up directories tree for Make sub-directory and build the target
    specified in Make/files

wmake/wmake

@@ -50,6 +50,7 @@ The 'target' is a Makefile target:
   e.g., Make/linux64GccDPOpt/fvMesh.o
 
 or a special target:
+  dwim              search up directories tree for Make sub-directory and build
   all               all subdirectories, uses any Allwmake files if they exist
   exe               build statically linked executable
   lib               build statically linked archive lib (.a)
@@ -136,7 +137,7 @@ fi
 
 
 #------------------------------------------------------------------------------
-# check arguments and change to the directory in which to run wmake
+# Check arguments and change to the directory in which to run wmake
 #------------------------------------------------------------------------------
 
 unset dir makeType
@@ -167,6 +168,51 @@ then
 fi
 
 
+#------------------------------------------------------------------------------
+# Search up directories tree for the Make sub-directory and build there
+#------------------------------------------------------------------------------
+
+unset dir
+MakeDir=Make
+
+expandpath()
+{
+    dir=`dirname $1`
+    cwd=$PWD
+    cd $dir
+    exPath=$PWD
+    cd $cwd
+}
+
+find_target()
+{
+    expandpath $1
+
+    if [ "$exPath" = "$WM_PROJECT_DIR" -o "$exPath" = "$HOME" -o "$exPath" = "/" ]; then
+        echo "$Script error: could not find Make directory"
+    elif [ -d "$1/Make" ]; then
+        echo Target $1
+        dir=$1
+    else
+        find_target "$1/.."
+    fi
+}
+
+if [ "$makeType" = dwim ]
+then
+    find_target .
+    makeType=
+
+    if [ "$dir" ]
+    then
+        cd $dir 2>/dev/null || {
+            echo "$Script error: could not change to directory '$dir'" 1>&2
+            exit 1
+        }
+    fi
+fi
+
+
 #------------------------------------------------------------------------------
 # Recurse the application directories tree
 #------------------------------------------------------------------------------
@@ -254,8 +300,9 @@ $make -s -f $WM_DIR/Makefile MAKE_DIR=$MakeDir INCLUDE_DEPS=$OBJECTS_DIR/dontInc
 rc=$?
 [ $rc -eq 0 ] || exit $rc
 
+
 #------------------------------------------------------------------------------
-# make the object files and link
+# Make the object files and link
 #------------------------------------------------------------------------------
 
 cmd="$make -f $WM_DIR/Makefile MAKE_DIR=$MakeDir INCLUDE_DEPS=$OBJECTS_DIR/includeDeps $makeType"