deferred savegame collection for faster startup

src/net/torvald/terrarum/SavegameCollection.kt

@@ -26,10 +26,10 @@ import kotlin.math.roundToInt
 /**
  * Created by minjaesong on 2023-06-24.
  */
-class SavegameCollection(files0: List<DiskSkimmer>) {
+class SavegameCollection(files0: List<DiskSkimmer>, prefiltered: Boolean) {
 
     /** Sorted in reverse by the last modified time of the files, index zero being the most recent */
-    val files = files0.sortedBy { it.diskFile.name }.sortedByDescending {
+    val files = if (prefiltered) files0 else files0.sortedBy { it.diskFile.name }.sortedByDescending {
         it.getLastModifiedTime().shl(2) or
         it.diskFile.extension.matches(Regex("^[abc]${'$'}")).toLong(1) or
         it.diskFile.extension.isBlank().toLong(0)
@@ -40,19 +40,28 @@ class SavegameCollection(files0: List<DiskSkimmer>) {
     val manualSaves = files.filter { !it.diskFile.extension.matches(Regex("[a-z]")) }
 
     init {
+        printdbg(this, "Rebuilding skimmers (${files.size})")
+//        files.forEach { it.rebuild() }
+    }
+
+    fun rebuildLoadable() {
+        loadable().rebuild()
+    }
+
+    fun rebuildAll() {
         files.forEach { it.rebuild() }
     }
 
     companion object {
         fun collectFromBaseFilename(skimmers: List<DiskSkimmer>, name: String): SavegameCollection {
-            return SavegameCollection(skimmers)
+            return SavegameCollection(skimmers, true)
         }
 
 
         fun collectFromBaseFilename(dir: File, name: String): SavegameCollection {
             val files = dir.listFiles().filter { it.name.startsWith(name) }
                 .mapNotNull { try { DiskSkimmer(it, true) } catch (e: Throwable) { null } }
-            return SavegameCollection(files)
+            return SavegameCollection(files, false)
         }
     }
 

src/net/torvald/terrarum/Terrarum.kt

@@ -799,7 +799,7 @@ fun AppUpdateListOfSavegames() {
             null
         }
     }.sortedByDescending { it.getLastModifiedTime() }
-    val filteringResults = arrayListOf<List<DiskSkimmer>>()
+    val filteringResults = arrayListOf<List<DiskSkimmer>>() // first element of the list is always file with no suffix
     worldsDirLs.forEach {
         val li = arrayListOf(it)
         listOf(".1",".2",".3",".a",".b",".c").forEach { suffix ->
@@ -818,6 +818,8 @@ fun AppUpdateListOfSavegames() {
 
         printdbg("ListSavegames", "    collecting...")
         val collection = SavegameCollection.collectFromBaseFilename(list, it.diskFile.name)
+        printdbg("ListSavegames", "    disk rebuilding...")
+        collection.rebuildLoadable()
         printdbg("ListSavegames", "    get UUID...")
         val worldUUID = collection.getUUID()
 
@@ -862,6 +864,8 @@ fun AppUpdateListOfSavegames() {
 
         printdbg("ListSavegames", "    collecting...")
         val collection = SavegameCollection.collectFromBaseFilename(list, it.diskFile.name)
+        printdbg("ListSavegames", "    disk rebuilding...")
+        collection.rebuildLoadable()
         printdbg("ListSavegames", "    get UUID...")
         val playerUUID = collection.getUUID()
 

src/net/torvald/terrarum/modulebasegame/ui/UILoadDemoSavefiles.kt

@@ -523,6 +523,7 @@ class UIItemPlayerCells(
         val loadable = App.savegamePlayers[playerUUID]!!.loadable()
         printdbg(this, "UUID: ${playerUUID}")
         printdbg(this, "File: ${loadable.diskFile.absolutePath}")
+        loadable.rebuild()
         loadable.getFile(SAVEGAMEINFO)?.bytes?.let {
             var lastPlayTime0 = 0L
 

src/net/torvald/terrarum/modulebasegame/ui/UILoadManage.kt

@@ -68,6 +68,7 @@ class UILoadManage(val full: UILoadSavegame) : UICanvas() {
 
             if (altDown && savegameIsNotNew) {
                 mode = MODE_PREV_SAVES
+                loadPrevGameInfo()
             }
             else {
                 if (full.loadables.saveAvaliable()) {
@@ -242,19 +243,20 @@ class UILoadManage(val full: UILoadSavegame) : UICanvas() {
         super.show()
     }
 
-    internal fun loadSavegameInfo() {
+    private fun loadPrevGameInfo() {
         val players = App.savegamePlayers[full.playerButtonSelected!!.playerUUID]!!.files
         val worlds = App.savegameWorlds[full.playerButtonSelected!!.worldUUID]!!.files
-
         val playerSavesInfo = players.map { it.getSavegameMeta() }
         val worldSavesInfo = worlds.map { it.getSavegameMeta() }
+
         sortedPlayerWorldList = getChronologicalPair(playerSavesInfo, worldSavesInfo)
 
         px48 = playerModTextboxX + (modulesTextboxW - tbw48) / 2
         wx48 = worldModTextboxX + (modulesTextboxW - tbw48) / 2
         totalTBH48 = sortedPlayerWorldList.size * 32
+    }
 
-
+    internal fun loadSavegameInfo() {
         playerName = App.savegamePlayersName[full.playerButtonSelected!!.playerUUID] ?: "Player"
 
         loadOrderPlayer =
@@ -437,6 +439,7 @@ class UILoadManage(val full: UILoadSavegame) : UICanvas() {
     }
 
     private fun DiskSkimmer.getSavegameMeta(): SavegameMeta {
+        if (!this.initialised) this.rebuild()
         this.getFile(SAVEGAMEINFO)!!.bytes.let {
             var lastPlayTime = 0L
             var versionString = ""