Documentation: add Docbook external references support

When writing technical documentation, it is often necessary to cross
reference to other information. When that other information is not in the
current document, additional support is needed, namely <olink>.

A new feature with version 1.7 of xorg-sgml-doctools adds references to
other documents within or outside this package.

This patch adds technical support for this feature but does not change
the content of the documentation as seen by the end user.

Each book or article must generate a database containing the href
of sections that can be referred to from another document. This database
is installed in DATAROOTDIR/sgml/X11/dbs. There is a requirement that
the value of DATAROOTDIR for xorg-sgml-doctools and for the package
documentation is the same. This forms a virtual document tree.

This database is consulted by other documents while they are being generated
in order to fulfill the missing information for linking.
Refer to the xorg-sgml-doctools for further technical information.

Co-authored-by: Matt Dew <marcoz@osource.org>

Signed-off-by: Gaetan Nadon <memsize@videotron.ca>

1 files changed, 95 insertions, 0 deletions

diff --git a/docbook.am b/docbook.am
new file mode 100644
index 0000000..3cf21e8
--- /dev/null
+++ b/docbook.am
@@ -0,0 +1,95 @@
+#
+# Generate output formats for a single DocBook/XML with/without chapters
+#
+# Variables set by the calling Makefile:
+# shelfdir: the location where the docs/specs are installed. Typically $(docdir)
+# 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 Users Documentation and Functional Specifications.
+# Do not use for Developer Documentation which is not installed and does not require olink.
+# Refer to http://www.x.org/releases/X11R7.6/doc/xorg-docs/ReleaseNotes.html#id2584393
+# for an explanation on documents classification.
+#
+
+# DocBook/XML generated output formats to be installed
+shelf_DATA =
+
+# DocBook/XML file with chapters, appendix and images it includes
+dist_shelf_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
+sgmldbsdir = $(XORG_SGML_PATH)/X11/dbs
+masterdb = "$(sgmldbsdir)/masterdb$(suffix $@).xml"
+XMLTO_FLAGS =							\
+	--searchpath "$(XORG_SGML_PATH)/X11"			\
+	--stringparam target.database.document=$(masterdb)	\
+	--stringparam current.docid="$(<:.xml=)"		\
+	--stringparam collect.xref.targets="no"
+
+XMLTO_XHTML_FLAGS = \
+	-x $(STYLESHEET_SRCDIR)/xorg-xhtml.xsl \
+	--stringparam html.stylesheet=$(STYLESHEET_SRCDIR)/xorg.css
+
+XMLTO_FO_FLAGS = \
+	-x $(STYLESHEET_SRCDIR)/xorg-fo.xsl
+endif HAVE_STYLESHEETS
+
+shelf_DATA += $(docbook:.xml=.html)
+%.html: %.xml  $(chapters)
+	$(AM_V_GEN)$(XMLTO) $(XMLTO_FLAGS) $(XMLTO_XHTML_FLAGS) xhtml-nochunks $<
+
+if HAVE_FOP
+shelf_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
+shelf_DATA += $(docbook:.xml=.txt)
+%.txt: %.xml $(chapters)
+	$(AM_V_GEN)$(XMLTO) $(XMLTO_FLAGS) $(XMLTO_XHTML_FLAGS) txt $<
+endif HAVE_XMLTO_TEXT
+
+#
+# Generate documents cross-reference target databases
+#
+
+# This is only possible if the xorg-sgml-doctools package is installed
+if HAVE_STYLESHEETS
+if HAVE_XSLTPROC
+
+# DocBook/XML generated document cross-reference database
+sgmldbs_DATA = $(docbook:.xml=.html.db) $(docbook:.xml=.fo.db)
+
+# Generate DocBook/XML document cross-reference database
+# Flags for the XSL Transformation processor generating xref target databases
+XSLTPROC_FLAGS =					\
+	--path "$(XORG_SGML_PATH)/X11"			\
+	--stringparam targets.filename "$@"		\
+	--stringparam collect.xref.targets "only"	\
+	--nonet --xinclude
+
+%.html.db: %.xml  $(chapters)
+	$(AM_V_GEN)$(XSLTPROC) $(XSLTPROC_FLAGS) \
+	http://docbook.sourceforge.net/release/xsl/current/xhtml/docbook.xsl $<
+
+%.fo.db: %.xml $(chapters)
+	$(AM_V_GEN)$(XSLTPROC) $(XSLTPROC_FLAGS) \
+	http://docbook.sourceforge.net/release/xsl/current/fo/docbook.xsl $<
+
+endif HAVE_XSLTPROC
+endif HAVE_STYLESHEETS
+
+CLEANFILES = $(shelf_DATA) $(sgmldbs_DATA)