Dealing with relative CSS files in chunked output

[Paul Millar <paul@astro.gla.ac.uk>]

[apologies if this is the wrong mailing list]

Hi all,

I noticed an issue with chunked web output and CSS.  I'm using v1.75.2 of the 
style-sheets (the Debian package is docbook-xsl 1.75.2+dfsg-3).

The issue is that, if the CSS file-name is relative and some of the chunked 
output goes into subdirectories then the generated HTML has a broken link to 
the CSS file.  This is because it doesn't take into account that one (or more) 
"../" prefixes are needed.  I searched around but this didn't seem to be a 
known issue, which surprises me.

I've included a rather ugly work-around below that customises the 
output.html.stylesheets template.  It is roughly based on the href.target in 
html/chunk-common.xsl.  This work-around doesn't provide support for multiple 
CSS files and absolute URIs (which is OK for my use), but might be 
insufficient for others.  I include it here in case it's useful for someone.

Cheers,

Paul.

---

  <!-- Work-around issue with chunking and having a relative CSS filename -->
  <xsl:template name="output.html.stylesheets">
    <xsl:variable name="depth">
      <xsl:call-template name="count.uri.path.depth">
	<xsl:with-param name="filename">
	  <xsl:call-template name="href.target.uri">
	    <xsl:with-param name="object" select="."/>
	  </xsl:call-template>
	</xsl:with-param>
      </xsl:call-template>
    </xsl:variable>

    <xsl:variable name="href">
      <xsl:call-template name="copy-string">
	<xsl:with-param name="string" select="'../'"/>
	<xsl:with-param name="count" select="$depth"/>
      </xsl:call-template>
      <xsl:value-of select="$html.stylesheet"/>
    </xsl:variable>

    <link rel="stylesheet" href="{$href}">
      <xsl:if test="$html.stylesheet.type != ''">
	<xsl:attribute name="type">
	  <xsl:value-of select="$html.stylesheet.type"/>
	</xsl:attribute>
      </xsl:if>
    </link>
  </xsl:template>