<xsl:param name="hyphenate.verbatim" select="0"></xsl:param>

Description

If the lines of program listing are too long to fit into one line it is quite common to split them at space and indicite by hook arrow that code continues on the next line. You can turn on this behaviour for programlisting, screen and synopsis elements by using this parameter.

Note that you must also enable line wrapping for verbatim environments and select appropriate hyphenation character (e.g. hook arrow). This can be done using monospace.verbatim.properties attribute set:

<xsl:attribute-set name="monospace.verbatim.properties" 
                   use-attribute-sets="verbatim.properties monospace.properties">
  <xsl:attribute name="wrap-option">wrap</xsl:attribute>
  <xsl:attribute name="hyphenation-character">&#x25BA;</xsl:attribute>
</xsl:attribute-set>

For a list of arrows available in Unicode see http://www.unicode.org/charts/PDF/U2190.pdf and http://www.unicode.org/charts/PDF/U2900.pdf and make sure that selected character is available in the font you are using for verbatim environments.