File backups in development builds

build.gradle

@@ -6,7 +6,7 @@ plugins {
 allprojects {
     apply plugin: "java"
 
-    version = "2.2.1-dev1"
+    version = "2.2.1-dev2"
 
     sourceCompatibility = 8
     [compileJava, compileTestJava]*.options*.encoding = 'UTF-8'

src/client/java/minicraft/core/Game.java

@@ -25,7 +25,7 @@ protected Game() {
 
 	public static final String NAME = "Minicraft Plus"; // This is the name on the application window.
 
-	public static final Version VERSION = new Version("2.2.1-dev1");
+	public static final Version VERSION = new Version("2.2.1-dev2");
 
 	public static InputHandler input; // Input used in Game, Player, and just about all the *Menu classes.
 	public static Player player;

src/client/java/minicraft/saveload/Load.java

@@ -62,6 +62,7 @@
 import minicraft.screen.SignDisplay;
 import minicraft.screen.SkinDisplay;
 import minicraft.screen.TutorialDisplayHandler;
+import minicraft.screen.WorldSelectDisplay;
 import minicraft.screen.entry.ListEntry;
 import minicraft.screen.entry.StringEntry;
 import minicraft.util.AdvancementElement;
@@ -128,6 +129,87 @@ public Load(String worldname, boolean loadGame) {
 
 		if (!loadGame) return;
 
+		// Is dev build
+		if (Game.VERSION.isDev() && worldVer.compareTo(Game.VERSION) < 0) {
+			Logging.SAVELOAD.info("Old world detected, backup prompting...");
+			ArrayList<ListEntry> entries = new ArrayList<>();
+			entries.addAll(Arrays.asList(StringEntry.useLines(Color.WHITE, false,
+				Localization.getLocalized("minicraft.displays.save.popup_display.world_backup_prompt.msg",
+					worldVer, Game.VERSION))));
+			entries.addAll(Arrays.asList(StringEntry.useLines("minicraft.display.popup.escape_cancel")));
+
+			AtomicBoolean acted = new AtomicBoolean(false);
+			AtomicBoolean continues = new AtomicBoolean(false);
+			AtomicBoolean doBackup = new AtomicBoolean(false);
+
+			ArrayList<PopupDisplay.PopupActionCallback> callbacks = new ArrayList<>();
+			callbacks.add(new PopupDisplay.PopupActionCallback("EXIT", m -> {
+				Game.exitDisplay();
+				acted.set(true);
+				return true;
+			}));
+
+			callbacks.add(new PopupDisplay.PopupActionCallback("ENTER|Y", m -> {
+				Game.exitDisplay();
+				continues.set(true);
+				doBackup.set(true);
+				acted.set(true);
+				return true;
+			}));
+
+			callbacks.add(new PopupDisplay.PopupActionCallback("N", m -> {
+				Game.exitDisplay();
+				continues.set(true);
+				acted.set(true);
+				return true;
+			}));
+
+			Game.setDisplay(new PopupDisplay(new PopupDisplay.PopupConfig(
+					"minicraft.displays.save.popup_display.world_backup_prompt", callbacks, 2),
+					entries.toArray(new ListEntry[0])));
+
+			while (true) {
+				if (acted.get()) {
+					if (continues.get()) {
+						if (doBackup.get()) {
+							Logging.SAVELOAD.info("Performing world backup...");
+							int i = 0;
+							String filename = worldname;
+							File f = new File(location + "/saves/", filename);
+							while (f.exists()) { // Increments world name if world exists
+								i++;
+								filename = worldname + " (" + i + ")";
+								f = new File(location + "/saves/", filename);
+							}
+							f.mkdirs();
+							try {
+								FileHandler.copyFolderContents(Paths.get(location, "saves", worldname),
+									f.toPath(), FileHandler.SKIP, false);
+							} catch (IOException e) {
+								Logging.SAVELOAD.error(e, "Error occurs while performing world backup, loading aborted");
+								throw new RuntimeException(new InterruptedException("World loading interrupted."));
+							}
+
+							Logging.SAVELOAD.info("World backup \"{}\" is created.", filename);
+							WorldSelectDisplay.updateWorlds();
+						} else
+							Logging.SAVELOAD.warn("World backup is skipped.");
+						Logging.SAVELOAD.debug("World loading continues...");
+					} else {
+						Logging.SAVELOAD.info("User cancelled world loading, loading aborted.");
+						throw new RuntimeException(new InterruptedException("World loading interrupted."));
+					}
+
+					break;
+				}
+
+				try {
+					//noinspection BusyWait
+					Thread.sleep(10);
+				} catch (InterruptedException ignored) {}
+			}
+		}
+
 		if (worldVer.compareTo(new Version("1.9.2")) < 0)
 			new LegacyLoad(worldname);
 		else {
@@ -198,6 +280,11 @@ public Load(String worldname, boolean loadGame) {
 
 						break;
 					}
+
+					try {
+						//noinspection BusyWait
+						Thread.sleep(10);
+					} catch (InterruptedException ignored) {}
 				}
 			}
 		}

src/client/java/minicraft/saveload/Save.java

@@ -48,6 +48,7 @@
 
 import java.io.BufferedWriter;
 import java.io.File;
+import java.io.FileNotFoundException;
 import java.io.FileWriter;
 import java.io.IOException;
 import java.util.ArrayList;
@@ -119,6 +120,36 @@ public Save(String worldname) {
 	 */
 	public Save() {
 		this(new File(Game.gameDir + "/"));
+
+		if (Game.VERSION.isDev()) { // Is dev build
+			Logging.SAVELOAD.debug("In dev build: Searching for old preferences...");
+			Version prefVer;
+			File prefFile = new File(location, "Preferences.json"); // Only this is checked when checking existence.
+			File unlocFile = new File(location, "Unlocks.json");
+			try {
+				JSONObject json = new JSONObject(Load.loadFromFile(location + "Preferences.json", false));
+				prefVer = new Version(json.getString("version"));
+			} catch (FileNotFoundException e) {
+				Logging.SAVELOAD.debug("Preferences.json is not found, ignoring...");
+				prefVer = null;
+			} catch (IOException e) {
+				Logging.SAVELOAD.error(e, "Unable to load Preferences.json, saving aborted");
+				return;
+			}
+
+			if (prefVer != null && prefVer.compareTo(Game.VERSION) < 0) {
+				Logging.SAVELOAD.info("Old preferences detected, backup performing...");
+				File prefBackupFile = new File(location + "Preferences.json.bak");
+				if (prefBackupFile.exists()) Logging.SAVELOAD.info("Overwriting old Preferences.json backup...");
+				if (prefBackupFile.delete()) Logging.SAVELOAD.trace("Preferences.json.bak is deleted.");
+				if (prefFile.renameTo(prefBackupFile)) Logging.SAVELOAD.trace("Preferences.json is renamed to Preferences.json.bak");
+				File unlocBackupFile = new File(location + "Unlocks.json.bak");
+				if (unlocBackupFile.exists()) Logging.SAVELOAD.info("Overwriting old Unlocks.json backup...");
+				if (unlocBackupFile.delete()) Logging.SAVELOAD.trace("Unlocks.json.bak is deleted.");
+				if (unlocFile.renameTo(unlocBackupFile)) Logging.SAVELOAD.trace("Unlocks.json is renamed to Unlocks.json.bak");
+			}
+		}
+
 		Logging.SAVELOAD.debug("Writing preferences and unlocks...");
 		writePrefs();
 		writeUnlocks();

src/client/java/minicraft/saveload/Version.java

@@ -80,6 +80,10 @@ public int compareTo(@NotNull Version ov, boolean ignoreDev) {
 		return 0; // The versions are equal.
 	}
 
+	public boolean isDev() {
+		return dev != 0;
+	}
+
 	@Override
 	public String toString() {
 		return make + "." + major + "." + minor + (dev == 0 ? "" : "-dev" + dev);

src/client/resources/assets/localization/en-us.json

@@ -356,6 +356,8 @@
   "minicraft.displays.resource_packs.display.help.position": "SHIFT-[LEFT|RIGHT|UP|DOWN] to move packs. ",
   "minicraft.displays.resource_packs.display.help.select": "%s to examine.",
   "minicraft.displays.resource_packs.display.title": "Resource Packs",
+  "minicraft.displays.save.popup_display.world_backup_prompt": "World Backup Prompt",
+  "minicraft.displays.save.popup_display.world_backup_prompt.msg": "The world is on version %s while you are on version %s. You are advised to perform a backup in case of irreversible world corruption. Should you like to perform a backup before continuing? (Y|N)",
   "minicraft.displays.skin": "Skins",
   "minicraft.displays.skin.display.help.move": "Use %s and %s to move.",
   "minicraft.displays.skin.display.help.select": "%s to select, and %s to cancel.",