doc: use common makefile for developers documentation

The user/specs docs now have external references support.
Developers doc are not installed so they do not participate.
However, using a similar makefile shared amongst developers
document reduces maintenance and is forward looking.

Man pages being out of here, reorg developers docs under the same roof.
Drop the obsolete sgml subdir.

Reviewed-by Jeremy Huddleston <jeremyhu@apple.com>
Signed-off-by: Gaetan Nadon <memsize@videotron.ca>
Signed-off-by: Keith Packard <keithp@keithp.com>

devbook.am

@@ -0,0 +1,62 @@
+#
+# Generate output formats for a single DocBook/XML with/without chapters
+#
+# Variables set by the calling Makefile:
+# noinst_DATA: developers docs are not installed
+# docbook:  the main DocBook/XML file, no chapters, appendix or image files
+# chapters: all files pulled in by an XInclude statement and images.
+#
+
+#
+# This makefile is intended for Developers Documentation and is not installed.
+# Do not use for Users docs or Specs which need to be installed and require olink support
+# Refer to http://www.x.org/releases/X11R7.6/doc/xorg-docs/ReleaseNotes.html#id2584393
+# for an explanation on documents classification.
+#
+
+# Developers documnetation is not installed
+noinst_DATA =
+
+# DocBook/XML file with chapters, appendix and images it includes
+dist_noinst_DATA = $(docbook) $(chapters)
+
+#
+# Generate DocBook/XML output formats with or without stylesheets
+#
+
+# Stylesheets are available if the package xorg-sgml-doctools is installed
+if HAVE_STYLESHEETS
+
+# The location where all cross reference databases are installed
+XMLTO_FLAGS =						\
+	--searchpath "$(XORG_SGML_PATH)/X11"		\
+	--searchpath "$(abs_top_builddir)/doc/xml"	\
+	--stringparam current.docid="$(<:.xml=)"
+
+XMLTO_XHTML_FLAGS = \
+	-m $(STYLESHEET_SRCDIR)/xorg-xhtml.xsl \
+	--stringparam html.stylesheet=$(STYLESHEET_SRCDIR)/xorg.css
+
+XMLTO_FO_FLAGS = \
+	-m $(STYLESHEET_SRCDIR)/xorg-fo.xsl
+endif HAVE_STYLESHEETS
+
+noinst_DATA += $(docbook:.xml=.html)
+%.html: %.xml  $(chapters)
+	$(AM_V_GEN)$(XMLTO) $(XMLTO_FLAGS) $(XMLTO_XHTML_FLAGS) xhtml-nochunks $<
+
+if HAVE_FOP
+noinst_DATA += $(docbook:.xml=.pdf) $(docbook:.xml=.ps)
+%.pdf: %.xml $(chapters)
+	$(AM_V_GEN)$(XMLTO) $(XMLTO_FLAGS) $(XMLTO_FO_FLAGS) --with-fop pdf $<
+%.ps: %.xml $(chapters)
+	$(AM_V_GEN)$(XMLTO) $(XMLTO_FLAGS) $(XMLTO_FO_FLAGS) --with-fop ps $<
+endif HAVE_FOP
+
+if HAVE_XMLTO_TEXT
+noinst_DATA += $(docbook:.xml=.txt)
+%.txt: %.xml $(chapters)
+	$(AM_V_GEN)$(XMLTO) $(XMLTO_FLAGS) $(XMLTO_XHTML_FLAGS) txt $<
+endif HAVE_XMLTO_TEXT
+
+CLEANFILES = $(noinst_DATA)