From 1b8441c17c5606fb9acc04678d1cd83f3a50285c Mon Sep 17 00:00:00 2001
From: Daniel James <daniel@calamity.org.uk>
Date: Wed, 25 Oct 2017 01:14:54 +0100
Subject: [PATCH] Use object.id in boostbook to docbook conversion

Will generate more consistent ids if generate.consistent.ids is set to 1.
---
 xsl/docbook.xsl | 4 ++++
 xsl/lookup.xsl  | 9 +++++----
 xsl/macro.xsl   | 2 +-
 3 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/xsl/docbook.xsl b/xsl/docbook.xsl
index 12bef90..a862bb1 100644
--- a/xsl/docbook.xsl
+++ b/xsl/docbook.xsl
@@ -9,12 +9,16 @@
 <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                 xmlns:xi="http://www.w3.org/2001/XInclude"
                 version="1.0">
+  <xsl:import href="http://docbook.sourceforge.net/release/xsl/current/common/common.xsl"/>
   <xsl:include href="reference.xsl"/>
 
   <xsl:output method="xml"
     doctype-public="-//OASIS//DTD DocBook XML V4.2//EN"
     doctype-system="http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"/>
 
+  <!-- Generate consistent id values if document is unchanged -->
+  <xsl:param name="generate.consistent.ids" select="0"/>
+
   <!-- The maximum number of columns allowed in preformatted text -->
   <xsl:param name="max-columns" select="78"/>
 
diff --git a/xsl/lookup.xsl b/xsl/lookup.xsl
index efc4e8c..eabfff8 100644
--- a/xsl/lookup.xsl
+++ b/xsl/lookup.xsl
@@ -22,7 +22,7 @@
   </xsl:template>
 
   <xsl:template match="*" mode="generate.id">
-    <xsl:value-of select="generate-id(.)"/>
+    <xsl:call-template name="object.id"/>
     <xsl:text>-bb</xsl:text>
   </xsl:template>
 
@@ -185,7 +185,7 @@
   <xsl:template match="*" mode="preprocess-ids">
     <element>
       <xsl:attribute name="id">
-        <xsl:value-of select="generate-id()"/>
+        <xsl:call-template name="object.id"/>
       </xsl:attribute>
       <xsl:attribute name="part-id">
         <xsl:call-template name="print-id-part"/>
@@ -234,10 +234,11 @@
           translate($part, '.&lt;&gt;;\:*?&quot;| ', '') != $part
         )">
         <xsl:variable name="normalized" select="translate(normalize-space(translate($part, '.&lt;&gt;;\:*?&quot;|_', '            ')), ' ', '_')"/>
+        <xsl:variable name="id"><xsl:call-template name="object.id"/></xsl:variable>
         <xsl:value-of select =
           "concat(
-            substring($normalized, 1, $boost.max.id.part.length - string-length(generate-id(.)) - 1),
-            concat('_', generate-id(.)))"/>
+            substring($normalized, 1, $boost.max.id.part.length - string-length($id) - 1),
+            concat('_', $id))"/>
       </xsl:when>
       <xsl:otherwise>
         <xsl:value-of select="$part"/>
diff --git a/xsl/macro.xsl b/xsl/macro.xsl
index fcd97a2..6d0fd94 100644
--- a/xsl/macro.xsl
+++ b/xsl/macro.xsl
@@ -115,7 +115,7 @@
     <xsl:if test="count(key('named-entities',
         translate(@name, $uppercase-letters, $lowercase-letters)))!=1">
       <xsl:text>_</xsl:text>
-      <xsl:value-of select="generate-id(.)"/>
+      <xsl:call-template name="object.id"/>
     </xsl:if>
   </xsl:template>
 </xsl:stylesheet>