Remove unsightly widows by adding a non-breaking space between the last two words in a string.

Widon't XSLT

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">

<!--
    	 Name: Widon't XSLT
    	 Version: 1.0
    	 Author: Oleg Kurapov
    	 URL: http://www.2sheds.ru/blog/2007/06/widont-in-xslt-dont-be-a-widow-maker/

    	 Description:
    	 Remove unsightly widows by adding a non-breaking space between the last two words in a string.

    	 Apply the template with param named `text` and use `normalize space` to remove any extra space at the end of the string.

	     <xsl:call-template name="widont-title">
	          <xsl:with-param name="text" select="normalize-space(fields/title)" />
	     </xsl:call-template>

    	 If the combined length of two last words is longer than the character length defined in the `maxlen` parameter, the non-breaking space is not added. This prevents the opposite of widows: orphans. Feel free to adjust that parameter.

    	 Credit:
    	 Based on Shaun Inman's Wordpress plugin. http://shauninman.com/archive/2006/12/05/widont_2_wordpress_plugin
-->

    <xsl:template name="widont-title">
        <xsl:param name="temp"/>
        <xsl:param name="text"/>
        <xsl:param name="maxlen" select="35"/>
        
        <xsl:choose>
            <xsl:when test="contains($text, ' ')">
                <xsl:variable name="prev" select="substring-before($text,' ')"/>
                <xsl:variable name="before" select="concat($temp,' ',$prev)"/>
                <xsl:variable name="after" select="substring-after($text, ' ')"/>
                
                <xsl:choose>
                    <xsl:when test="contains($after, ' ')">
                        <xsl:call-template name="widont-title">
                            <xsl:with-param name="temp" select="$before"/>
                            <xsl:with-param name="text" select="$after"/>
                        </xsl:call-template>
                    </xsl:when>
                    <xsl:when test="not(contains($after, ' ')) and string-length(concat($prev,$after)) &lt; $maxlen">
                        <xsl:value-of select="concat($before, '&#160;', $after)" />
                    </xsl:when>
                    <xsl:otherwise>
                        <xsl:value-of select="concat($before, ' ', $after)" />
                    </xsl:otherwise>
                </xsl:choose>
            </xsl:when>
            
            <xsl:otherwise>
                <xsl:value-of select="$text"/>
            </xsl:otherwise>
        </xsl:choose>
    </xsl:template>
</xsl:stylesheet>

Nice !