From 18f0f0b0d03fe7780cd2b76909a64f2a6b952591 Mon Sep 17 00:00:00 2001
From: Bob Stayton <bobs@sagehill.net>
Date: Sun, 2 Dec 2012 20:06:41 +0000
Subject: [PATCH] Add force.blank.pages parameter to allow turning off blank
 pages in double.sided output.

---
 xsl/fo/pagesetup.xsl | 86 ++++++++++++++++++++++++++++++--------------
 xsl/fo/param.ent     |  1 +
 xsl/fo/param.xweb    |  2 ++
 3 files changed, 62 insertions(+), 27 deletions(-)

diff --git a/xsl/fo/pagesetup.xsl b/xsl/fo/pagesetup.xsl
index d2f2e0dd1..95008c7d1 100644
--- a/xsl/fo/pagesetup.xsl
+++ b/xsl/fo/pagesetup.xsl
@@ -2117,8 +2117,10 @@
       <fo:repeatable-page-master-alternatives>
         <fo:conditional-page-master-reference master-reference="blank"
                                               blank-or-not-blank="blank"/>
-        <fo:conditional-page-master-reference master-reference="titlepage-first"
-                                              page-position="first"/>
+        <xsl:if test="$force.blank.pages != 0">
+          <fo:conditional-page-master-reference master-reference="titlepage-first"
+                                                page-position="first"/>
+        </xsl:if>
         <fo:conditional-page-master-reference master-reference="titlepage-odd"
                                               odd-or-even="odd"/>
         <fo:conditional-page-master-reference 
@@ -2138,8 +2140,10 @@
       <fo:repeatable-page-master-alternatives>
         <fo:conditional-page-master-reference master-reference="blank"
                                               blank-or-not-blank="blank"/>
-        <fo:conditional-page-master-reference master-reference="lot-first"
-                                              page-position="first"/>
+        <xsl:if test="$force.blank.pages != 0">
+          <fo:conditional-page-master-reference master-reference="lot-first"
+                                                page-position="first"/>
+        </xsl:if>
         <fo:conditional-page-master-reference master-reference="lot-odd"
                                               odd-or-even="odd"/>
         <fo:conditional-page-master-reference 
@@ -2159,8 +2163,10 @@
       <fo:repeatable-page-master-alternatives>
         <fo:conditional-page-master-reference master-reference="blank"
                                               blank-or-not-blank="blank"/>
-        <fo:conditional-page-master-reference master-reference="front-first"
-                                              page-position="first"/>
+        <xsl:if test="$force.blank.pages != 0">
+          <fo:conditional-page-master-reference master-reference="front-first"
+                                                page-position="first"/>
+        </xsl:if>
         <fo:conditional-page-master-reference master-reference="front-odd"
                                               odd-or-even="odd"/>
         <fo:conditional-page-master-reference 
@@ -2180,8 +2186,10 @@
       <fo:repeatable-page-master-alternatives>
         <fo:conditional-page-master-reference master-reference="blank"
                                               blank-or-not-blank="blank"/>
-        <fo:conditional-page-master-reference master-reference="body-first"
-                                              page-position="first"/>
+        <xsl:if test="$force.blank.pages != 0">
+          <fo:conditional-page-master-reference master-reference="body-first"
+                                                page-position="first"/>
+        </xsl:if>
         <fo:conditional-page-master-reference master-reference="body-odd"
                                               odd-or-even="odd"/>
         <fo:conditional-page-master-reference 
@@ -2201,8 +2209,10 @@
       <fo:repeatable-page-master-alternatives>
         <fo:conditional-page-master-reference master-reference="blank"
                                               blank-or-not-blank="blank"/>
-        <fo:conditional-page-master-reference master-reference="back-first"
-                                              page-position="first"/>
+        <xsl:if test="$force.blank.pages != 0">
+          <fo:conditional-page-master-reference master-reference="back-first"
+                                                page-position="first"/>
+        </xsl:if>
         <fo:conditional-page-master-reference master-reference="back-odd"
                                               odd-or-even="odd"/>
         <fo:conditional-page-master-reference 
@@ -2222,8 +2232,10 @@
       <fo:repeatable-page-master-alternatives>
         <fo:conditional-page-master-reference master-reference="blank"
                                               blank-or-not-blank="blank"/>
-        <fo:conditional-page-master-reference master-reference="index-first"
-                                              page-position="first"/>
+        <xsl:if test="$force.blank.pages != 0">
+          <fo:conditional-page-master-reference master-reference="index-first"
+                                                page-position="first"/>
+        </xsl:if>
         <fo:conditional-page-master-reference master-reference="index-odd"
                                               odd-or-even="odd"/>
         <fo:conditional-page-master-reference 
@@ -2244,8 +2256,10 @@
         <fo:repeatable-page-master-alternatives>
           <fo:conditional-page-master-reference master-reference="blank-draft"
                                                 blank-or-not-blank="blank"/>
-          <fo:conditional-page-master-reference master-reference="titlepage-first-draft"
-                                                page-position="first"/>
+          <xsl:if test="$force.blank.pages != 0">
+            <fo:conditional-page-master-reference master-reference="titlepage-first-draft"
+                                                  page-position="first"/>
+          </xsl:if>
           <fo:conditional-page-master-reference master-reference="titlepage-odd-draft"
                                                 odd-or-even="odd"/>
           <fo:conditional-page-master-reference 
@@ -2265,8 +2279,10 @@
         <fo:repeatable-page-master-alternatives>
           <fo:conditional-page-master-reference master-reference="blank-draft"
                                                 blank-or-not-blank="blank"/>
-          <fo:conditional-page-master-reference master-reference="lot-first-draft"
-                                                page-position="first"/>
+          <xsl:if test="$force.blank.pages != 0">
+            <fo:conditional-page-master-reference master-reference="lot-first-draft"
+                                                  page-position="first"/>
+          </xsl:if>
           <fo:conditional-page-master-reference master-reference="lot-odd-draft"
                                                 odd-or-even="odd"/>
           <fo:conditional-page-master-reference 
@@ -2286,8 +2302,10 @@
         <fo:repeatable-page-master-alternatives>
           <fo:conditional-page-master-reference master-reference="blank-draft"
                                                 blank-or-not-blank="blank"/>
-          <fo:conditional-page-master-reference master-reference="front-first-draft"
-                                                page-position="first"/>
+          <xsl:if test="$force.blank.pages != 0">
+            <fo:conditional-page-master-reference master-reference="front-first-draft"
+                                                  page-position="first"/>
+          </xsl:if>
           <fo:conditional-page-master-reference master-reference="front-odd-draft"
                                                 odd-or-even="odd"/>
           <fo:conditional-page-master-reference 
@@ -2307,8 +2325,10 @@
         <fo:repeatable-page-master-alternatives>
           <fo:conditional-page-master-reference master-reference="blank-draft"
                                                 blank-or-not-blank="blank"/>
-          <fo:conditional-page-master-reference master-reference="body-first-draft"
-                                                page-position="first"/>
+          <xsl:if test="$force.blank.pages != 0">
+            <fo:conditional-page-master-reference master-reference="body-first-draft"
+                                                  page-position="first"/>
+          </xsl:if>
           <fo:conditional-page-master-reference master-reference="body-odd-draft"
                                                 odd-or-even="odd"/>
           <fo:conditional-page-master-reference 
@@ -2328,8 +2348,10 @@
         <fo:repeatable-page-master-alternatives>
           <fo:conditional-page-master-reference master-reference="blank-draft"
                                                 blank-or-not-blank="blank"/>
-          <fo:conditional-page-master-reference master-reference="back-first-draft"
-                                                page-position="first"/>
+          <xsl:if test="$force.blank.pages != 0">
+            <fo:conditional-page-master-reference master-reference="back-first-draft"
+                                                  page-position="first"/>
+          </xsl:if>
           <fo:conditional-page-master-reference master-reference="back-odd-draft"
                                                 odd-or-even="odd"/>
           <fo:conditional-page-master-reference 
@@ -2349,8 +2371,10 @@
         <fo:repeatable-page-master-alternatives>
           <fo:conditional-page-master-reference master-reference="blank-draft"
                                                 blank-or-not-blank="blank"/>
-          <fo:conditional-page-master-reference master-reference="index-first-draft"
-                                                page-position="first"/>
+          <xsl:if test="$force.blank.pages != 0">
+            <fo:conditional-page-master-reference master-reference="index-first-draft"
+                                                  page-position="first"/>
+          </xsl:if>
           <fo:conditional-page-master-reference master-reference="index-odd-draft"
                                                 odd-or-even="odd"/>
           <fo:conditional-page-master-reference 
@@ -3258,6 +3282,12 @@
   <xsl:param name="element" select="local-name(.)"/>
   <xsl:param name="master-reference" select="''"/>
 
+  <xsl:variable name="first">
+    <xsl:choose>
+      <xsl:when test="$force.blank.pages = 0">auto</xsl:when>
+      <xsl:otherwise>auto-odd</xsl:otherwise>
+    </xsl:choose>
+  </xsl:variable>
   <!-- Select the first content that the stylesheet places
        after the TOC -->
   <xsl:variable name="first.book.content" 
@@ -3276,11 +3306,11 @@
     <!-- double-sided output -->
     <xsl:when test="$double.sided != 0">
       <xsl:choose>
-        <xsl:when test="$element = 'toc'">auto-odd</xsl:when>
+        <xsl:when test="$element = 'toc'"><xsl:value-of select="$first"/></xsl:when>
         <xsl:when test="$element = 'book'">1</xsl:when>
         <!-- preface typically continues TOC roman numerals -->
         <!-- Change page.number.format if not -->
-        <xsl:when test="$element = 'preface'">auto-odd</xsl:when>
+        <xsl:when test="$element = 'preface'"><xsl:value-of select="$first"/></xsl:when>
         <xsl:when test="($element = 'dedication' or $element = 'article') 
                     and not(preceding::chapter
                             or preceding::preface
@@ -3291,7 +3321,7 @@
                             or parent::reference)">1</xsl:when>
         <xsl:when test="generate-id($first.book.content) =
                         generate-id(.)">1</xsl:when>
-        <xsl:otherwise>auto-odd</xsl:otherwise>
+        <xsl:otherwise><xsl:value-of select="$first"/></xsl:otherwise>
       </xsl:choose>
     </xsl:when>
 
@@ -3322,6 +3352,8 @@
   <xsl:param name="master-reference" select="''"/>
 
   <xsl:choose>
+    <!-- no automatic even blank pages at end of chapters -->
+    <xsl:when test="$force.blank.pages = 0">no-force</xsl:when>
     <!-- double-sided output -->
     <xsl:when test="$double.sided != 0">end-on-even</xsl:when>
     <!-- single-sided output -->
diff --git a/xsl/fo/param.ent b/xsl/fo/param.ent
index 6ee9ad27a..8c0fb9801 100644
--- a/xsl/fo/param.ent
+++ b/xsl/fo/param.ent
@@ -359,3 +359,4 @@
 <!ENTITY table.caption.properties SYSTEM "../params/table.caption.properties.xml">
 <!ENTITY para.properties SYSTEM "../params/para.properties.xml">
 <!ENTITY activate.external.olinks SYSTEM "../params/activate.external.olinks.xml">
+<!ENTITY force.blank.pages SYSTEM "../params/force.blank.pages.xml">
diff --git a/xsl/fo/param.xweb b/xsl/fo/param.xweb
index 0f0f8a85c..81eb46f00 100644
--- a/xsl/fo/param.xweb
+++ b/xsl/fo/param.xweb
@@ -377,6 +377,7 @@ zero by default, so this is simply the page-master margin-right.
 &page.width.portrait;
 &paper.type;
 &double.sided;
+&force.blank.pages;
 &body.margin.bottom;
 &body.margin.top;
 &body.margin.inner;
@@ -668,6 +669,7 @@ around all these parameters.</para>
 <src:fragref linkend="footnote.sep.leader.properties.frag"/>
 <src:fragref linkend="fop.extensions.frag"/>
 <src:fragref linkend="fop1.extensions.frag"/>
+<src:fragref linkend="force.blank.pages.frag"/>
 <src:fragref linkend="formal.object.properties.frag"/>
 <src:fragref linkend="formal.procedures.frag"/>
 <src:fragref linkend="formal.title.placement.frag"/>
-- 
2.40.0