build: don't encode local paths in output

Link instead directly to the github examples, since they aren't
packaged.

The html is an exception, since the examples could be included in
hosting wherever the html is hosted, and the html preserves relative
paths.

Signed-off-by: Daniel Burgener <[email protected]>
[PM: tweak subject line]
Signed-off-by: Paul Moore <[email protected]>

Makefile

@@ -17,6 +17,7 @@ IMAGES = $(SRCDIR)/images
 EXAMPLES = $(SRCDIR)/notebook-examples
 EXAMPLES_EPUB = $(shell echo $(EXAMPLES) | $(SED) 's;/;\\/;g')
 METADATA = $(SRCDIR)/metadata.yaml
+EXAMPLES_GITHUB = $(shell echo https://github.com/SELinuxProject/selinux-notebook/tree/main/src/notebook-examples | $(SED) 's;/;\\/;g')
 
 HTML_OUT = SELinux_Notebook.html
 PDF_OUT = SELinux_Notebook.pdf
@@ -73,6 +74,9 @@ pdf: $(DEP_FILE_LIST) $(METADATA)
 	$(SED) -i 's/](.*\.md#/](#/' $(PDFDIR)/.full_document.md
 	# remove the section file name from all HTML links
 	$(SED) -i 's/href=.*\.md#/href="#/' $(PDFDIR)/.full_document.md
+	# fixup path for examples, directing at the github repo
+	$(SED) -i 's/](.\/notebook-examples/]($(EXAMPLES_GITHUB)/g' \
+		$(PDFDIR)/.full_document.md
 	[ -e $(PDFDIR)/images ] || ln -s $(IMAGES) $(PDFDIR)
 	[ -e $(PDFDIR)/notebook-examples ] || ln -s $(EXAMPLES) $(PDFDIR)
 	(cd $(PDFDIR); $(PANDOC) --pdf-engine=weasyprint $(PANDOC_OPTS) \
@@ -120,8 +124,8 @@ epub: $(DEP_FILE_LIST) $(METADATA)
 	$(SED) -i 's/](.*\.md#/](#/' $(EPUBDIR)/.full_document.md
 	# remove the section file name from all HTML links
 	$(SED) -i 's/href=.*\.md#/href="#/' $(EPUBDIR)/.full_document.md
-	# fixup path for examples, otherwise defaults to file:///EPUB/text
-	$(SED) -i 's/](.\/notebook-examples/](file:\/\/$(EXAMPLES_EPUB)/g' \
+	# fixup path for examples, directing at the github repo
+	$(SED) -i 's/](.\/notebook-examples/]($(EXAMPLES_GITHUB)/g' \
 		$(EPUBDIR)/.full_document.md
 	[ -e $(EPUBDIR)/images ] || ln -s $(IMAGES) $(EPUBDIR)
 	[ -e $(EPUBDIR)/notebook-examples ] || ln -s $(EXAMPLES) $(EPUBDIR)