From f463fec1b519938ed77276c5a5eeaf3e1f940f0d Mon Sep 17 00:00:00 2001
From: Andres Freund <andres@anarazel.de>
Date: Wed, 29 Mar 2023 15:34:21 -0700
Subject: [PATCH v4 5/6] docs: load stylesheet via custom.css.source

---
 doc/src/sgml/Makefile                    |  3 +--
 doc/src/sgml/meson.build                 |  2 +-
 doc/src/sgml/stylesheet-html-common.xsl  |  8 ++++++++
 doc/src/sgml/stylesheet-html-nochunk.xsl |  3 +++
 doc/src/sgml/stylesheet.css.xml          |  8 ++++++++
 doc/src/sgml/stylesheet.xsl              | 11 -----------
 6 files changed, 21 insertions(+), 14 deletions(-)
 create mode 100644 doc/src/sgml/stylesheet.css.xml

diff --git a/doc/src/sgml/Makefile b/doc/src/sgml/Makefile
index 11ecdaf717e..71cbef230f3 100644
--- a/doc/src/sgml/Makefile
+++ b/doc/src/sgml/Makefile
@@ -39,7 +39,7 @@ ifndef FOP
 FOP = $(missing) fop
 endif
 
-XMLINCLUDE = --path .
+XMLINCLUDE = --path . --path $(srcdir)
 
 ifdef XMLLINT
 XMLLINT := $(XMLLINT) --nonet
@@ -144,7 +144,6 @@ html: html-stamp
 
 html-stamp: stylesheet.xsl postgres-full.xml $(ALL_IMAGES)
 	$(XSLTPROC) $(XMLINCLUDE) $(XSLTPROCFLAGS) $(XSLTPROC_HTML_FLAGS) $(wordlist 1,2,$^)
-	cp $(srcdir)/stylesheet.css html/
 	touch $@
 
 # single-page HTML
diff --git a/doc/src/sgml/meson.build b/doc/src/sgml/meson.build
index 7719adfc73b..19531ebbcc7 100644
--- a/doc/src/sgml/meson.build
+++ b/doc/src/sgml/meson.build
@@ -96,7 +96,7 @@ if xsltproc_bin.found()
   xsltproc_flags = [
     '--nonet',
     '--stringparam', 'pg.version', pg_version,
-    '--path', '@OUTDIR@',
+    '--path', '@OUTDIR@', '--path', '@CURRENT_SOURCE_DIR@',
   ]
 
   xsltproc = xmltools_wrapper + [
diff --git a/doc/src/sgml/stylesheet-html-common.xsl b/doc/src/sgml/stylesheet-html-common.xsl
index 9df2782ce4f..bb6429ef7cf 100644
--- a/doc/src/sgml/stylesheet-html-common.xsl
+++ b/doc/src/sgml/stylesheet-html-common.xsl
@@ -18,6 +18,14 @@
 <xsl:param name="make.graphic.viewport" select="0"/>
 <xsl:param name="link.mailto.url">pgsql-docs@lists.postgresql.org</xsl:param>
 <xsl:param name="toc.max.depth">2</xsl:param>
+<xsl:param name="website.stylesheet" select="0"/>
+<xsl:param name="custom.css.source">
+  <xsl:if test="$website.stylesheet = 0">stylesheet.css.xml</xsl:if>
+</xsl:param>
+<xsl:param name="html.stylesheet">
+  <xsl:if test="not($website.stylesheet = 0)">https://www.postgresql.org/media/css/docs-complete.css</xsl:if>
+</xsl:param>
+
 
 <!--
   The below allows the stylesheets provided by the website to be applied fully
diff --git a/doc/src/sgml/stylesheet-html-nochunk.xsl b/doc/src/sgml/stylesheet-html-nochunk.xsl
index 8167127b93a..5a0bb4ea08f 100644
--- a/doc/src/sgml/stylesheet-html-nochunk.xsl
+++ b/doc/src/sgml/stylesheet-html-nochunk.xsl
@@ -7,6 +7,9 @@
 <xsl:include href="stylesheet-html-common.xsl" />
 <xsl:include href="stylesheet-speedup-xhtml.xsl" />
 
+<!-- except when referencing the online stylesheet, embed stylesheet -->
+<xsl:param name="generate.css.header" select="$website.stylesheet = 0"/>
+
 <!-- embed SVG images into output file -->
 <xsl:template match="imagedata[@format='SVG']">
   <xsl:variable name="filename">
diff --git a/doc/src/sgml/stylesheet.css.xml b/doc/src/sgml/stylesheet.css.xml
new file mode 100644
index 00000000000..a21fcca576f
--- /dev/null
+++ b/doc/src/sgml/stylesheet.css.xml
@@ -0,0 +1,8 @@
+<!--
+    wrapper around stylesheet.css.xml to allow it to be loaded via docbook-xsl's
+    generate.css.header parameter.
+-->
+<!DOCTYPE style [
+<!ENTITY css SYSTEM "stylesheet.css">
+]>
+<style>&css;</style>
diff --git a/doc/src/sgml/stylesheet.xsl b/doc/src/sgml/stylesheet.xsl
index c492dc38e54..363cc93e6b0 100644
--- a/doc/src/sgml/stylesheet.xsl
+++ b/doc/src/sgml/stylesheet.xsl
@@ -17,17 +17,6 @@
 <xsl:param name="chunk.quietly" select="1"></xsl:param>
 <xsl:param name="admon.style"></xsl:param>  <!-- handled by CSS stylesheet -->
 
-<xsl:param name="website.stylesheet" select="0"/>
-
-<xsl:param name="html.stylesheet">
-  <xsl:choose>
-    <xsl:when test="$website.stylesheet = 0">stylesheet.css</xsl:when>
-    <xsl:otherwise>
-      https://www.postgresql.org/media/css/docs-complete.css
-    </xsl:otherwise>
-  </xsl:choose>
-</xsl:param>
-
 
 <!-- copy images to the output directory, so the output is self contained -->
 <xsl:template match="imageobject">
-- 
2.38.0