add logo building to Makefile

Author: jbweston

docs/Makefile

@@ -14,7 +14,14 @@ help:
 
 .PHONY: help Makefile
 
+source/_static/logo_docs.png: logo.py
+	python logo.py
+
+# Fake target to avoid the catch-all target
+logo.py:
+	@echo "never executed"
+
 # Catch-all target: route all unknown targets to Sphinx using the new
 # "make mode" option.  $(O) is meant as a shortcut for $(SPHINXOPTS).
-%: Makefile
+%: Makefile source/_static/logo_docs.png
 	@$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)

docs/logo.py

@@ -1,3 +1,8 @@
+import os
+import sys
+
+sys.path.insert(0, os.path.abspath('..'))  # to get adaptive on the path
+
 import adaptive
 import holoviews
 import matplotlib.pyplot as plt