docbook-xsl: fix infinite recursion for e.g. samba

Closes: https://trac.macports.org/ticket/72362

textproc/docbook-xsl/Portfile

@@ -37,7 +37,7 @@ if {${subport} eq ${name}} {
 }
 
 subport ${name}-nons {
-    revision        0
+    revision        1
     description     Non-namespaced version of the DocBook XSL stylesheets
     distname        ${subport}-${version}
     checksums       rmd160  63bae43e79c3b8bc3dac66711eb8c9e5ae3e4a32 \
@@ -46,7 +46,7 @@ subport ${name}-nons {
 }
 
 subport ${name}-ns {
-    revision        0
+    revision        1
     description     Namespaced version of the DocBook XSL stylesheets
     distname        ${name}-${version}
     checksums       rmd160  425ca8723443bcd45c23d33df26e13b930b2ce42 \
@@ -55,7 +55,7 @@ subport ${name}-ns {
 }
 
 subport ${name}-docs {
-    revision        0
+    revision        1
     description     Documentation for the DocBook XSL stylesheets
     distname        ${name}-doc-${version}
     worksrcdir      ${name}-${version}
@@ -76,6 +76,10 @@ use_configure       no
 build               {}
 
 if {${subport} in [list "${name}-nons" "${name}-ns"]} {
+    # Non-recursive string.subst that doesn't kill smb.conf.5 generation
+    # See: https://trac.macports.org/ticket/72362
+    patchfiles-append   patch-libxsl.diff
+
     xml.catalog     ${prefix}/${instxsldir}/catalog.xml \
                     ${prefix}/${instxsldir}/catalog.sf.xml
 

textproc/docbook-xsl/files/patch-libxsl.diff

@@ -0,0 +1,30 @@
+Description: use EXSLT "replace" function when available
+ A recursive implementation  of string.subst is problematic,
+ long strings with many matches will cause stack overflows.
+Author: Peter De Wachter <pdewacht@gmail.com>
+Bug-Debian: https://bugs.debian.org/750593
+
+--- lib/lib.xsl.orig
++++ lib/lib.xsl
+@@ -6,7 +6,10 @@
+ 
+      This module implements DTD-independent functions
+ 
+-     ******************************************************************** --><xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
++     ******************************************************************** --><xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
++                xmlns:str="http://exslt.org/strings"
++                exclude-result-prefixes="str"
++                version="1.0">
+ 
+ <xsl:template name="dot.count">
+   <!-- Returns the number of "." characters in a string -->
+@@ -52,6 +56,9 @@
+   <xsl:param name="replacement"/>
+ 
+   <xsl:choose>
++    <xsl:when test="function-available('str:replace')">
++      <xsl:value-of select="str:replace($string, string($target), string($replacement))"/>
++    </xsl:when>
+     <xsl:when test="contains($string, $target)">
+       <xsl:variable name="rest">
+         <xsl:call-template name="string.subst">