Add a global make docs target

.gitignore

@@ -3,3 +3,4 @@ build/cluster/*
 build/sphere/*
 build/trapping/*
 doc/build/*
+

src/Makefile

 SUBDIRS := cluster sphere trapping
 SRCDIR=$(PWD)
 BUILDDIR=$(SRCDIR)/../build
+DOCSDIR=$(SRCDIR)/../doc
 
 all: $(SUBDIRS)
 
+docs:
+	cd $(DOCSDIR)/src; doxygen config.dox
+
 $(SUBDIRS):
 	$(MAKE) -C $@
 
@@ -16,5 +20,7 @@ wipe:
 	rm -f $(BUILDDIR)/cluster/*
 	rm -f $(BUILDDIR)/sphere/*
 	rm -f $(BUILDDIR)/trapping/*
+	if [ -d $(DOCSDIR)/build/html ]; then rm -r $(DOCSDIR)/build/html; fi
+	if [ -d $(DOCSDIR)/build/latex ]; then rm -r $(DOCSDIR)/build/latex; fi
 
 .PHONY: all $(SUBDIRS)