add doxypypy support to Subzero doxygen

docs/Doxyfile

@@ -876,7 +876,7 @@ INPUT_FILTER           = "awk '                                                \
 # filters are used. If the FILTER_PATTERNS tag is empty or if none of the
 # patterns match the file name, INPUT_FILTER is applied.
 
-FILTER_PATTERNS        =
+FILTER_PATTERNS        = *.py=./py_filter
 
 # If the FILTER_SOURCE_FILES tag is set to YES, the input filter (if set using
 # INPUT_FILTER ) will also be used to filter the input files that are used for

docs/Makefile.standalone

 .PHONY: all
 
-all:
+all::
 	mkdir -p ../build
 	doxygen Doxyfile
 	@echo See file://`pwd`/../build/docs/html/index.html
+
+DOXYPYPY := $(shell which doxypypy)
+
+ifeq ("$(DOXYPYPY)", "")
+all::
+	$(info Warning: ......................................)
+	$(info To get best Doxygen output for Python code, the)
+	$(info Python doxypypy package should be installed, e.g.)
+	$(info   'sudo pip install doxypypy')
+	$(info  ... or ... )
+	$(info   'easy_install doxypypy')
+	$(info see https://github.com/Feneric/doxypypy)
+endif

docs/py_filter

+#!/bin/bash
+x=`which doxypypy`
+if [ "$x" == "" ]; then
+  cat $1
+else
+  doxypypy -a -c $1
+fi