new savegame loading wip

src/net/torvald/terrarum/SavegameCollection.kt

@@ -0,0 +1,37 @@
+package net.torvald.terrarum
+
+import net.torvald.terrarum.savegame.DiskSkimmer
+import java.io.File
+
+/**
+ * Created by minjaesong on 2023-06-24.
+ */
+class SavegameCollection(files0: List<DiskSkimmer>) {
+
+    /** Sorted in reverse by the last modified time of the files, index zero being the most recent */
+    val files = files0.sortedByDescending { it.getLastModifiedTime() }
+    /** Sorted in reverse by the last modified time of the files, index zero being the most recent */
+    val autoSaves = files.filter { it.diskFile.extension.matches(Regex("[a-z]")) }
+    /** Sorted in reverse by the last modified time of the files, index zero being the most recent */
+    val manualSaves = files.filter { !it.diskFile.extension.matches(Regex("[a-z]")) }
+
+    init {
+        files.forEach { it.rebuild() }
+    }
+
+    companion object {
+        fun collectFromBaseFilename(basedir: File, name: String): SavegameCollection {
+            val files = basedir.listFiles().filter { it.name.startsWith(name) }
+                .mapNotNull { try { DiskSkimmer(it, true) } catch (e: Throwable) { null } }
+            return SavegameCollection(files)
+        }
+    }
+
+    /**
+     * Returns the most recent not-corrupted file
+     */
+    fun loadable(): DiskSkimmer {
+        return files.first()
+    }
+
+}