[mm-common] Create Devhelp chapters only for existing content

[Daniel Elstner <daniel src gnome org>]

commit cb406024b3a8269bfb5e931db36162552469abd9
Author: Daniel Elstner <danielk openismus com>
Date:   Thu Sep 3 18:25:11 2009 +0200

    Create Devhelp chapters only for existing content
    
    * util/tagfile-to-devhelp2.xsl (chapters): Output the <sub> elements
    only if they will have at least one child node.  This way, there will
    be no broken chapter link in the Devhelp documentation if the module
    does not define any Doxygen groups, for instance.

 util/tagfile-to-devhelp2.xsl |   29 +++++++++++++++++++++++------
 1 files changed, 23 insertions(+), 6 deletions(-)
---
diff --git a/util/tagfile-to-devhelp2.xsl b/util/tagfile-to-devhelp2.xsl
index f534074..f834051 100644
--- a/util/tagfile-to-devhelp2.xsl
+++ b/util/tagfile-to-devhelp2.xsl
@@ -29,21 +29,38 @@
     <book title="{$book_title}" name="{$book_name}" base="{$book_base}"
           link="index.html" version="2" language="c++">
       <chapters>
-        <sub name="Modules" link="modules.html">
+        <xsl:variable name="modules">
           <xsl:apply-templates select="tagfile/compound[ kind='group']" mode="module">
             <xsl:sort lang="en" select="title"/>
           </xsl:apply-templates>
-        </sub>
-        <sub name="Namespaces" link="namespaces.html">
+        </xsl:variable>
+        <xsl:if test="$modules">
+          <sub name="Modules" link="modules.html">
+            <xsl:copy-of select="$modules"/>
+          </sub>
+        </xsl:if>
+
+        <xsl:variable name="namespaces">
           <xsl:apply-templates select="tagfile/compound[ kind='namespace']" mode="sub">
             <xsl:sort lang="en" case-order="upper-first" select="name"/>
           </xsl:apply-templates>
-        </sub>
-        <sub name="Classes" link="classes.html">
+        </xsl:variable>
+        <xsl:if test="$namespaces">
+          <sub name="Namespaces" link="namespaces.html">
+            <xsl:copy-of select="$namespaces"/>
+          </sub>
+        </xsl:if>
+
+        <xsl:variable name="classes">
           <xsl:apply-templates select="tagfile/compound[ kind='class' or @kind='struct']" mode="sub">
             <xsl:sort lang="en" case-order="upper-first" select="name"/>
           </xsl:apply-templates>
-        </sub>
+        </xsl:variable>
+        <xsl:if test="$classes">
+          <sub name="Classes" link="classes.html">
+            <xsl:copy-of select="$classes"/>
+          </sub>
+        </xsl:if>
       </chapters>
       <functions>
         <xsl:apply-templates select="tagfile/compound" mode="compound">