From aefcd948dbbc5b4014295bf0172312c0c87bcaa8 Mon Sep 17 00:00:00 2001
From: Mark Rotteveel <mark@lawinegevaar.nl>
Date: Sun, 13 Oct 2024 13:10:14 +0200
Subject: [PATCH] Declare canonical URL

---
 doc-extension.groovy                  | 10 +++++++++-
 src/docs/asciidoc/jaybird_manual.adoc |  1 +
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/doc-extension.groovy b/doc-extension.groovy
index 9a9be19..fd7db18 100644
--- a/doc-extension.groovy
+++ b/doc-extension.groovy
@@ -1,7 +1,7 @@
 // Preprocessor for since/until roles in pdf backend (in html5 backed this is handled using CSS)
 preprocessor {
     document, reader ->
-        if (document.options['backend'] != 'pdf') {
+        if (!document.basebackend('pdf')) {
             println 'skipping since/until preprocessor for non-PDF'
             return
         }
@@ -26,4 +26,12 @@ preprocessor {
             }
         }
         reader.restoreLines(replacement)
+}
+docinfo_processor {
+    document -> {
+        if (!document.basebackend('html') || !document.hasAttribute('fb-canonical-html')) {
+            return
+        }
+        return "<link rel=\"canonical\" href=\"${document.getAttribute('fb-canonical-html')}\"/>"
+    }
 }
\ No newline at end of file
diff --git a/src/docs/asciidoc/jaybird_manual.adoc b/src/docs/asciidoc/jaybird_manual.adoc
index d486dda..a0d4341 100644
--- a/src/docs/asciidoc/jaybird_manual.adoc
+++ b/src/docs/asciidoc/jaybird_manual.adoc
@@ -26,6 +26,7 @@ Roman Rokytskyy; Mark Rotteveel
 :jaybird-template-version: {jaybird5-template-version}
 :jna-version: 5.14.0
 :min-support-firebird: 2.5
+:fb-canonical-html: https://firebirdsql.github.io/jaybird-manual/jaybird_manual.html
 :is-snapshot:
 
 ifdef::is-snapshot[]