Documentation: add XSLT to fix DocBook for Texinfo

There are two ways to create a section in a reference document (i.e.,
manpage) in DocBook 4: refsection elements and refsect, refsect2, and
refsect3 elements.  Either form is acceptable as of DocBook 4.2, but
they cannot be mixed.  Prior to DocBook 4.2, only the numbered forms
were acceptable.

docbook2texi only accepts the numbered forms, and this has not generally
been a problem, since AsciiDoc produces the numbered forms.
Asciidoctor, on the other hand, uses a shared backend for DocBook 4 and
5, and uses the unnumbered refsection elements instead.

If we don't convert the unnumbered form to the numbered form,
docbook2texi omits section headings, which is undesirable.  Add an XSLT
stylesheet to transform the unnumbered forms to the numbered forms
automatically, and preprocess the DocBook XML as part of the
transformation to Texinfo format.

Note that this transformation is only necessary for Texinfo, since
docbook2texi provides its own stylesheets.  The DocBook stylesheets,
which we use for other formats, provide the full range of DocBook 4 and
5 compatibility, and don't have this issue.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/Makefile b/Documentation/Makefile
index 5e32bbe9137c9aa5b0483da5c30181f9f54b7381..eecc27aba29af3c7a258ef6e17aadb912db5512f 100644 (file)
--- a/Documentation/Makefile
+++ b/Documentation/Makefile
@@ -371,10 +371,11 @@ user-manual.pdf: user-manual.xml
        $(DBLATEX) -o $@+ -p $(ASCIIDOC_DBLATEX_DIR)/asciidoc-dblatex.xsl -s $(ASCIIDOC_DBLATEX_DIR)/asciidoc-dblatex.sty $< && \
        mv $@+ $@
 
-gitman.texi: $(MAN_XML) cat-texi.perl
+gitman.texi: $(MAN_XML) cat-texi.perl texi.xsl
        $(QUIET_DB2TEXI)$(RM) $@+ $@ && \
-       ($(foreach xml,$(sort $(MAN_XML)),$(DOCBOOK2X_TEXI) --encoding=UTF-8 \
-               --to-stdout $(xml) &&) true) > $@++ && \
+       ($(foreach xml,$(sort $(MAN_XML)),xsltproc -o $(xml)+ texi.xsl $(xml) && \
+               $(DOCBOOK2X_TEXI) --encoding=UTF-8 --to-stdout $(xml)+ && \
+               rm $(xml)+ &&) true) > $@++ && \
        $(PERL_PATH) cat-texi.perl $@ <$@++ >$@+ && \
        rm $@++ && \
        mv $@+ $@

diff --git a/Documentation/texi.xsl b/Documentation/texi.xsl
new file mode 100644 (file)
index 0000000..0f8ff07
--- /dev/null
+++ b/Documentation/texi.xsl
@@ -0,0 +1,26 @@
+<!-- texi.xsl:
+     convert refsection elements into refsect elements that docbook2texi can
+     understand -->
+<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+               version="1.0">
+
+<xsl:output method="xml"
+           encoding="UTF-8"
+           doctype-public="-//OASIS//DTD DocBook XML V4.5//EN"
+           doctype-system="http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" />
+
+<xsl:template match="//refsection">
+       <xsl:variable name="element">refsect<xsl:value-of select="count(ancestor-or-self::refsection)" /></xsl:variable>
+       <xsl:element name="{$element}">
+               <xsl:apply-templates select="@*|node()" />
+       </xsl:element>
+</xsl:template>
+
+<!-- Copy all other nodes through. -->
+<xsl:template match="node()|@*">
+       <xsl:copy>
+               <xsl:apply-templates select="@*|node()" />
+       </xsl:copy>
+</xsl:template>
+
+</xsl:stylesheet>