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>

2 files changed, 7 insertions, 52 deletions

diff --git a/doc/.gitignore b/doc/.gitignore
index 6fa5c31..92946c9 100644
--- a/doc/.gitignore
+++ b/doc/.gitignore
@@ -2,3 +2,4 @@
 *.ps
 *.pdf
 *.txt
+*.db
diff --git a/doc/Makefile.am b/doc/Makefile.am
index ea304a2..32e9345 100644
--- a/doc/Makefile.am
+++ b/doc/Makefile.am
@@ -1,61 +1,15 @@
-#
-# Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
-#
-# Permission is hereby granted, free of charge, to any person obtaining a
-# copy of this software and associated documentation files (the "Software"),
-# to deal in the Software without restriction, including without limitation
-# the rights to use, copy, modify, merge, publish, distribute, sublicense,
-# and/or sell copies of the Software, and to permit persons to whom the
-# Software is furnished to do so, subject to the following conditions:
-#
-# The above copyright notice and this permission notice (including the next
-# paragraph) shall be included in all copies or substantial portions of the
-# Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
-# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
-# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
-# DEALINGS IN THE SOFTWARE.
-#
 
 if ENABLE_DOCS
-doc_sources = SMlib.xml xsmp.xml
-dist_doc_DATA = $(doc_sources)
-
 if HAVE_XMLTO
-doc_DATA = $(doc_sources:.xml=.html)
-
-if HAVE_FOP
-doc_DATA += $(doc_sources:.xml=.ps) $(doc_sources:.xml=.pdf)
-endif
-
-if HAVE_XMLTO_TEXT
-doc_DATA += $(doc_sources:.xml=.txt)
-endif
-
-if HAVE_STYLESHEETS
-XMLTO_FLAGS = -m $(XSL_STYLESHEET) \
-	--stringparam html.stylesheet=$(STYLESHEET_SRCDIR)/xorg.css
-endif
-
-CLEANFILES = $(doc_DATA)
-
-SUFFIXES = .xml .ps .pdf .txt .html
-
-.xml.txt:
-	$(AM_V_GEN)$(XMLTO) $(XMLTO_FLAGS) txt $<
 
-.xml.html:
-	$(AM_V_GEN)$(XMLTO) $(XMLTO_FLAGS) xhtml-nochunks $<
+# Main DocBook/XML files (DOCTYPE book)
+docbook = SMlib.xml xsmp.xml
 
-.xml.pdf:
-	$(AM_V_GEN)$(XMLTO) $(XMLTO_FLAGS) --with-fop pdf $<
+# The location where the DocBook/XML files and their generated formats are installed
+shelfdir = $(docdir)
 
-.xml.ps:
-	$(AM_V_GEN)$(XMLTO) $(XMLTO_FLAGS) --with-fop ps $<
+# Generate DocBook/XML output formats with or without stylesheets
+include $(top_srcdir)/docbook.am
 
 endif HAVE_XMLTO
 endif ENABLE_DOCS