epub3 group-position

[bin101]

I would like to migrate from calibre-web but I have a large epub collection with many series and I don't want to break my series by applying random series indices.

The group-position in most of my series is part of the epub3 standard (https://www.w3.org/TR/epub-33/#sec-group-position) and it would be nice to support it during reading the metadata from the internal opf file of an epub

[bin101]

Should be pretty easy, sth like that w/o testing:

diff --git a/komga/src/main/kotlin/org/gotson/komga/infrastructure/metadata/epub/EpubMetadataProvider.kt b/komga/src/main/kotlin/org/gotson/komga/infrastructure/metadata/epub/EpubMetadataProvider.kt
index 0a7b93d5..aacd2d83 100644
--- a/komga/src/main/kotlin/org/gotson/komga/infrastructure/metadata/epub/EpubMetadataProvider.kt
+++ b/komga/src/main/kotlin/org/gotson/komga/infrastructure/metadata/epub/EpubMetadataProvider.kt
@@ -79,2 +79,6 @@ class EpubMetadataProvider(
 
+      val seriesIndex = opf.selectFirst("metadata > *|meta[property=belongs-to-collection]")?.attr("id")?.let { id ->
+        opf.selectFirst("metadata > *|meta[refines=$id][property=group-position]")
+      }?.text()
+
       return BookMetadataPatch(
@@ -85,2 +89,4 @@ class EpubMetadataProvider(
         isbn = isbn,
+        number = seriesIndex?.ifBlank { null },
+        numberSort = seriesIndex?.toFloatOrNull(),
       )

[gotson]

closed in #1656