From aaa56a814faedfeefc6e5daae4919b979e76a6c6 Mon Sep 17 00:00:00 2001
From: Bastian Wagner <github@baswag.de>
Date: Mon, 8 Apr 2024 04:17:41 +0200
Subject: [PATCH] CreDocument: support added 'identifier' metadata (#11628)

Currently not exposed in Book information.
---
 frontend/document/credocument.lua | 1 +
 frontend/document/document.lua    | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/frontend/document/credocument.lua b/frontend/document/credocument.lua
index 2748b5a68..25b057ca7 100644
--- a/frontend/document/credocument.lua
+++ b/frontend/document/credocument.lua
@@ -38,6 +38,7 @@ local CreDocument = Document:extend{
         authors      = "doc.authors",
         series       = "doc.series.name",
         series_index = "doc.series.number",
+        identifiers  = "doc.identifiers",
     },
 
     -- Reasons for the fallback font ordering:
diff --git a/frontend/document/document.lua b/frontend/document/document.lua
index 269cfe59a..687f1c976 100644
--- a/frontend/document/document.lua
+++ b/frontend/document/document.lua
@@ -201,6 +201,7 @@ function Document:getProps(cached_doc_metadata)
     local language = makeNilIfEmpty(props.language or props.Language)
     local keywords = makeNilIfEmpty(props.keywords or props.Keywords)
     local description = makeNilIfEmpty(props.description or props.Description or props.subject)
+    local identifiers = makeNilIfEmpty(props.identifiers)
     return {
         title        = title,
         authors      = authors,
@@ -209,6 +210,7 @@ function Document:getProps(cached_doc_metadata)
         language     = language,
         keywords     = keywords,
         description  = description,
+        identifiers  = identifiers,
     }
 end