Update Makefile to build AsciiDoc documentation.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>

.gitignore

@@ -3,6 +3,10 @@ __pycache__
 *.pyc
 *.pyo
 tags
+*.xml
+*.fo
+*.html
+*.xhtml
 *.ps
 *.pdf
 *~

doc/Makefile

@@ -1,12 +1,33 @@
-SRC			:= manual.me
-OBJ			:= $(SRC:.me=.pdf)
-GROFF		:= groff
-PS2PDF		:= ps2pdf
+SRC			:= manual.adoc
+OBJ			:= $(SRC:.adoc=.pdf) $(SRC:.adoc=.html)
+EXTRA_OBJ	:= $(SRC:.adoc=.ps) $(SRC:.adoc=.xhtml)
+EXTRA_OBJ	+= $(SRC:.adoc=.xml) $(SRC:.adoc=.fo)
+ASCIIDOC	:= asciidoctor
+XSLTPROC	:= xsltproc
+FOP			:= fop
+DOCBOOK_XSL := /usr/share/xml/docbook/stylesheet/docbook-xsl-ns
+DOCBOOK_FO  := $(DOCBOOK_XSL)/fo/docbook.xsl
 
 all: $(OBJ)
 
-%.ps: %.me
-	$(GROFF) -me -Tps $< > $@
+clean:
+	$(RM) $(OBJ)
+	$(RM) $(EXTRA_OBJ)
 
-%.pdf: %.ps
-	$(PS2PDF) $^ $@
+%.html: %.adoc
+	$(ASCIIDOC) -b html5 -o $@ $<
+
+%.xhtml: %.adoc
+	$(ASCIIDOC) -b xhtml5 -o $@ $<
+
+%.xml: %.adoc
+	$(ASCIIDOC) -b docbook5 -o $@ $<
+
+%.fo: %.xml
+	$(XSLTPROC) -o $@ $(DOCBOOK_FO) $<
+
+%.pdf: %.fo
+	$(FOP) -fo $< -pdf $@
+
+%.ps: %.fo
+	$(FOP) -fo $< -ps $@