feat: delete empty read lists and collections

closes #551

komga/src/main/kotlin/org/gotson/komga/domain/persistence/ReadListRepository.kt

@@ -37,5 +37,6 @@ interface ReadListRepository {
   fun delete(readListId: String)
 
   fun deleteAll()
+  fun deleteEmpty()
   fun existsByName(name: String): Boolean
 }

komga/src/main/kotlin/org/gotson/komga/domain/persistence/SeriesCollectionRepository.kt

@@ -37,5 +37,6 @@ interface SeriesCollectionRepository {
   fun delete(collectionId: String)
 
   fun deleteAll()
+  fun deleteEmpty()
   fun existsByName(name: String): Boolean
 }

komga/src/main/kotlin/org/gotson/komga/domain/service/LibraryContentLifecycle.kt

@@ -6,7 +6,10 @@ import org.gotson.komga.domain.model.Library
 import org.gotson.komga.domain.model.Media
 import org.gotson.komga.domain.persistence.BookRepository
 import org.gotson.komga.domain.persistence.MediaRepository
+import org.gotson.komga.domain.persistence.ReadListRepository
+import org.gotson.komga.domain.persistence.SeriesCollectionRepository
 import org.gotson.komga.domain.persistence.SeriesRepository
+import org.gotson.komga.infrastructure.configuration.KomgaProperties
 import org.springframework.stereotype.Service
 import java.nio.file.Paths
 import java.time.temporal.ChronoUnit
@@ -22,6 +25,9 @@ class LibraryContentLifecycle(
   private val bookLifecycle: BookLifecycle,
   private val mediaRepository: MediaRepository,
   private val seriesLifecycle: SeriesLifecycle,
+  private val collectionRepository: SeriesCollectionRepository,
+  private val readListRepository: ReadListRepository,
+  private val komgaProperties: KomgaProperties,
   private val taskReceiver: TaskReceiver,
 ) {
 
@@ -116,6 +122,16 @@ class LibraryContentLifecycle(
           }
         }
       }
+
+      if (komgaProperties.deleteEmptyCollections) {
+        logger.info { "Deleting empty collections" }
+        collectionRepository.deleteEmpty()
+      }
+
+      if (komgaProperties.deleteEmptyReadLists) {
+        logger.info { "Deleting empty read lists" }
+        readListRepository.deleteEmpty()
+      }
     }.also { logger.info { "Library updated in $it" } }
   }
 }

komga/src/main/kotlin/org/gotson/komga/infrastructure/configuration/KomgaProperties.kt

@@ -16,6 +16,10 @@ class KomgaProperties {
 
   var librariesScanDirectoryExclusions: List<String> = emptyList()
 
+  var deleteEmptyReadLists: Boolean = true
+
+  var deleteEmptyCollections: Boolean = true
+
   var rememberMe = RememberMe()
 
   var nativeWebp: Boolean = true

komga/src/main/kotlin/org/gotson/komga/infrastructure/jooq/ReadListDao.kt

@@ -209,6 +209,18 @@ class ReadListDao(
     }
   }
 
+  override fun deleteEmpty() {
+    dsl.deleteFrom(rl)
+      .where(
+        rl.ID.`in`(
+          dsl.select(rl.ID)
+            .from(rl)
+            .leftJoin(rlb).on(rl.ID.eq(rlb.READLIST_ID))
+            .where(rlb.READLIST_ID.isNull)
+        )
+      ).execute()
+  }
+
   override fun existsByName(name: String): Boolean =
     dsl.fetchExists(
       dsl.selectFrom(rl)

komga/src/main/kotlin/org/gotson/komga/infrastructure/jooq/SeriesCollectionDao.kt

@@ -209,6 +209,18 @@ class SeriesCollectionDao(
     }
   }
 
+  override fun deleteEmpty() {
+    dsl.deleteFrom(c)
+      .where(
+        c.ID.`in`(
+          dsl.select(c.ID)
+            .from(c)
+            .leftJoin(cs).on(c.ID.eq(cs.COLLECTION_ID))
+            .where(cs.COLLECTION_ID.isNull)
+        )
+      ).execute()
+  }
+
   override fun existsByName(name: String): Boolean =
     dsl.fetchExists(
       dsl.selectFrom(c)

komga/src/main/resources/application-dev.yml

@@ -9,6 +9,8 @@ komga:
     file: ":memory:"
   cors.allowed-origins:
     - http://localhost:8081
+#  delete-empty-collections: true
+#  delete-empty-read-lists: true
 spring:
   artemis:
     embedded: