Mark files that failed to download with an 'x' in the progress window. Also modified the legend to emphasize the fact that the file will again be tried to download during the next run.

src/main/kotlin/de/fabianonline/telegram_backup/CommandLineDownloadProgress.kt

@@ -51,7 +51,7 @@ internal class CommandLineDownloadProgress : DownloadProgressInterface {
 		println("'S' - Sticker       'A' - Audio         'G' - Geolocation")
 		println("'.' - Previously downloaded file        'e' - Empty file")
 		println("' ' - Ignored media type (weblinks or contacts, for example)")
-		println("'x' - File skipped because of timeout errors")
+		println("'x' - File skipped because of errors - will be tried again at next run")
 		println("" + count + " Files to check / download")
 	}
 

src/main/kotlin/de/fabianonline/telegram_backup/DownloadManager.kt

@@ -364,8 +364,12 @@ class DownloadManager(internal var client: TelegramClient?, p: DownloadProgressI
 				prog!!.onMediaAlreadyPresent(m)
 			} else {
 				try {
-					m.download()
-					prog!!.onMediaDownloaded(m)
+					val result = m.download()
+					if (result) {
+						prog!!.onMediaDownloaded(m)
+					} else {
+						prog!!.onMediaSkipped()
+					}
 				} catch (e: TimeoutException) {
 					// do nothing - skip this file
 					prog!!.onMediaSkipped()

src/main/kotlin/de/fabianonline/telegram_backup/mediafilemanager/AbstractMediaFileManager.kt

@@ -78,7 +78,7 @@ abstract class AbstractMediaFileManager(protected var message: TLMessage, protec
 	abstract val name: String
 	abstract val description: String
 	@Throws(RpcErrorException::class, IOException::class, TimeoutException::class)
-	abstract fun download()
+	abstract fun download(): Boolean
 
 	protected fun extensionFromMimetype(mime: String): String {
 		when (mime) {

src/main/kotlin/de/fabianonline/telegram_backup/mediafilemanager/DocumentFileManager.kt

@@ -97,9 +97,10 @@ open class DocumentFileManager(msg: TLMessage, user: UserManager, client: Telegr
 	}
 
 	@Throws(RpcErrorException::class, IOException::class, TimeoutException::class)
-	override fun download() {
+	override fun download(): Boolean {
 		if (doc != null) {
 			DownloadManager.downloadFile(targetPathAndFilename, size, doc!!.getDcId(), doc!!.getId(), doc!!.getAccessHash())
 		}
+		return true
 	}
 }

src/main/kotlin/de/fabianonline/telegram_backup/mediafilemanager/GeoFileManager.kt

@@ -72,11 +72,11 @@ class GeoFileManager(msg: TLMessage, user: UserManager, client: TelegramClient)
 	}
 
 	@Throws(IOException::class)
-	override fun download() {
+	override fun download(): Boolean {
 		val url = "https://maps.googleapis.com/maps/api/staticmap?" +
 			"center=" + geo.getLat() + "," + geo.getLong() + "&" +
 			"zoom=14&size=300x150&scale=2&format=png&" +
 			"key=" + Config.SECRET_GMAPS
-		DownloadManager.downloadExternalFile(targetPathAndFilename, url)
+		return DownloadManager.downloadExternalFile(targetPathAndFilename, url)
 	}
 }

src/main/kotlin/de/fabianonline/telegram_backup/mediafilemanager/PhotoFileManager.kt

@@ -77,9 +77,10 @@ class PhotoFileManager(msg: TLMessage, user: UserManager, client: TelegramClient
 	}
 
 	@Throws(RpcErrorException::class, IOException::class, TimeoutException::class)
-	override fun download() {
-		if (isEmpty) return
+	override fun download(): Boolean {
+		if (isEmpty) return true
 		val loc = photo_size.getLocation() as TLFileLocation
 		DownloadManager.downloadFile(targetPathAndFilename, size, loc.getDcId(), loc.getVolumeId(), loc.getLocalId(), loc.getSecret())
+		return true
 	}
 }

src/main/kotlin/de/fabianonline/telegram_backup/mediafilemanager/StickerFileManager.kt

@@ -95,16 +95,16 @@ class StickerFileManager(msg: TLMessage, user: UserManager, client: TelegramClie
 		get() = "Sticker"
 
 	@Throws(RpcErrorException::class, IOException::class, TimeoutException::class)
-	override fun download() {
+	override fun download(): Boolean {
 		val old_file = Config.FILE_BASE + File.separatorChar + Config.FILE_STICKER_BASE + File.separatorChar + targetFilename
 
 		logger.trace("Old filename exists: {}", File(old_file).exists())
 
 		if (File(old_file).exists()) {
 			Files.copy(Paths.get(old_file), Paths.get(targetPathAndFilename), StandardCopyOption.REPLACE_EXISTING)
-			return
+			return true
 		}
-		super.download()
+		return super.download()
 	}
 
 	companion object {

src/main/kotlin/de/fabianonline/telegram_backup/mediafilemanager/UnsupportedFileManager.kt

@@ -54,5 +54,5 @@ class UnsupportedFileManager(msg: TLMessage, user: UserManager, client: Telegram
 	override val letter = " "
 	override val description = "Unsupported / non-downloadable Media"
 
-	override fun download() {}
+	override fun download(): Boolean = true
 }