[PATCH] Documentation: Add asciidoc.conf file and gitlink: macro

Introduce an asciidoc.conf file with the purpose of adding a gitlink:
macro which will improve the manpage output.

Original cogito patch by Jonas Fonseca <fonseca@diku.dk>;
asciidoc.conf from that patch was further enhanced to use the proper
DocBook tag <citerefentry> for references to man pages.
Signed-off-by: NSergey Vlasov <vsu@altlinux.ru>
Signed-off-by: NJunio C Hamano <junkio@cox.net>

Documentation/Makefile

@@ -57,13 +57,13 @@ clean:
 	rm -f *.xml *.html *.1 *.7 howto-index.txt howto/*.html
 
 %.html : %.txt
-	asciidoc -b xhtml11 -d manpage $<
+	asciidoc -b xhtml11 -d manpage -f asciidoc.conf $<
 
 %.1 %.7 : %.xml
 	xmlto man $<
 
 %.xml : %.txt
-	asciidoc -b docbook -d manpage $<
+	asciidoc -b docbook -d manpage -f asciidoc.conf $<
 
 git.html: git.txt ../README
 

Documentation/asciidoc.conf

+## gitlink: macro
+#
+# Usage: gitlink:command[manpage-section]
+#
+# Note, {0} is the manpage section, while {target} is the command.
+#
+# Show GIT link as: <command>(<section>); if section is defined, else just show
+# the command.
+
+ifdef::backend-docbook[]
+[gitlink-inlinemacro]
+{0%{target}}
+{0#<citerefentry>}
+{0#<refentrytitle>{target}</refentrytitle><manvolnum>{0}</manvolnum>}
+{0#</citerefentry>}
+endif::backend-docbook[]
+
+ifdef::backend-xhtml11[]
+[gitlink-inlinemacro]
+<a href="{target}.html">{target}{0?({0})}</a>
+endif::backend-xhtml11[]