Cleanup parent folders when deleting downloaded chapters (#776)

Currently, the download folder never gets cleaned up which leads to having a lot of empty folders (sources, mangas folders)

server/src/main/kotlin/suwayomi/tachidesk/manga/impl/download/fileProvider/impl/ArchiveProvider.kt

@@ -7,14 +7,21 @@ import org.apache.commons.compress.archivers.zip.ZipArchiveEntry
 import org.apache.commons.compress.archivers.zip.ZipArchiveInputStream
 import org.apache.commons.compress.archivers.zip.ZipArchiveOutputStream
 import org.apache.commons.compress.archivers.zip.ZipFile
+import org.kodein.di.DI
+import org.kodein.di.conf.global
+import org.kodein.di.instance
 import suwayomi.tachidesk.manga.impl.download.fileProvider.ChaptersFilesProvider
 import suwayomi.tachidesk.manga.impl.download.model.DownloadChapter
 import suwayomi.tachidesk.manga.impl.util.getChapterCachePath
 import suwayomi.tachidesk.manga.impl.util.getChapterCbzPath
 import suwayomi.tachidesk.manga.impl.util.getMangaDownloadDir
+import suwayomi.tachidesk.manga.impl.util.storage.FileDeletionHelper
+import suwayomi.tachidesk.server.ApplicationDirs
 import java.io.File
 import java.io.InputStream
 
+private val applicationDirs by DI.global.instance<ApplicationDirs>()
+
 class ArchiveProvider(mangaId: Int, chapterId: Int) : ChaptersFilesProvider(mangaId, chapterId) {
     override fun getImageImpl(index: Int): Pair<InputStream, String> {
         val cbzPath = getChapterCbzPath(mangaId, chapterId)
@@ -67,8 +74,13 @@ class ArchiveProvider(mangaId: Int, chapterId: Int) : ChaptersFilesProvider(mang
 
     override fun delete(): Boolean {
         val cbzFile = File(getChapterCbzPath(mangaId, chapterId))
-        if (cbzFile.exists()) return cbzFile.delete()
-        return false
+        if (!cbzFile.exists()) {
+            return true
+        }
+
+        val cbzDeleted = cbzFile.delete()
+        FileDeletionHelper.cleanupParentFoldersFor(cbzFile, applicationDirs.mangaDownloadsRoot)
+        return cbzDeleted
     }
 
     private fun handleExistingCbzFile(

server/src/main/kotlin/suwayomi/tachidesk/manga/impl/download/fileProvider/impl/FolderProvider.kt

@@ -1,14 +1,21 @@
 package suwayomi.tachidesk.manga.impl.download.fileProvider.impl
 
 import kotlinx.coroutines.CoroutineScope
+import org.kodein.di.DI
+import org.kodein.di.conf.global
+import org.kodein.di.instance
 import suwayomi.tachidesk.manga.impl.download.fileProvider.ChaptersFilesProvider
 import suwayomi.tachidesk.manga.impl.download.model.DownloadChapter
 import suwayomi.tachidesk.manga.impl.util.getChapterCachePath
 import suwayomi.tachidesk.manga.impl.util.getChapterDownloadPath
+import suwayomi.tachidesk.manga.impl.util.storage.FileDeletionHelper
+import suwayomi.tachidesk.server.ApplicationDirs
 import java.io.File
 import java.io.FileInputStream
 import java.io.InputStream
 
+private val applicationDirs by DI.global.instance<ApplicationDirs>()
+
 /*
 * Provides downloaded files when pages were downloaded into folders
 * */
@@ -42,18 +49,14 @@ class FolderProvider(mangaId: Int, chapterId: Int) : ChaptersFilesProvider(manga
     }
 
     override fun delete(): Boolean {
-        val chapterDir = getChapterDownloadPath(mangaId, chapterId)
-        return File(chapterDir).deleteRecursively()
-    }
+        val chapterDirPath = getChapterDownloadPath(mangaId, chapterId)
+        val chapterDir = File(chapterDirPath)
+        if (!chapterDir.exists()) {
+            return true
+        }
 
-    private fun isExistingFile(
-        folder: File,
-        fileName: String,
-    ): Boolean {
-        val existingFile =
-            folder.listFiles { file ->
-                file.isFile && file.name.startsWith(fileName)
-            }?.firstOrNull()
-        return existingFile?.exists() == true
+        val chapterDirDeleted = chapterDir.deleteRecursively()
+        FileDeletionHelper.cleanupParentFoldersFor(chapterDir, applicationDirs.mangaDownloadsRoot)
+        return chapterDirDeleted
     }
 }

server/src/main/kotlin/suwayomi/tachidesk/manga/impl/util/storage/FileDeletionHelper.kt

@@ -0,0 +1,29 @@
+package suwayomi.tachidesk.manga.impl.util.storage
+
+import java.io.File
+
+object FileDeletionHelper {
+    /**
+     * Recursively deletes all parent folders for the given deleted file until the parent folder is not empty, or it's the root folder
+     */
+    fun cleanupParentFoldersFor(
+        file: File,
+        rootPath: String,
+    ) {
+        val folder = file.parentFile
+        if (!folder.isDirectory) {
+            return
+        }
+
+        if (folder.absolutePath == rootPath) {
+            return
+        }
+
+        if (folder.listFiles()?.isEmpty() != true) {
+            return
+        }
+
+        folder.delete()
+        cleanupParentFoldersFor(folder, rootPath)
+    }
+}