Cache online mod list for fast load

.gitignore

@@ -144,6 +144,7 @@ android/release/
 
 # Transient Unciv files
 android/assets/GameSettings.json
+/android/assets/ModListCache.json
 android/assets/lasterror.txt
 android/assets/fonts/
 android/assets/maps/

core/src/com/unciv/logic/files/UncivFiles.kt

@@ -22,6 +22,7 @@ import com.unciv.models.metadata.GameSettings
 import com.unciv.models.metadata.doMigrations
 import com.unciv.models.metadata.isMigrationNecessary
 import com.unciv.models.ruleset.RulesetCache
+import com.unciv.ui.screens.modmanager.ModUIData
 import com.unciv.ui.screens.savescreens.Gzip
 import com.unciv.utils.Concurrency
 import com.unciv.utils.Log
@@ -34,6 +35,7 @@ private const val SAVE_FILES_FOLDER = "SaveFiles"
 private const val MULTIPLAYER_FILES_FOLDER = "MultiplayerGames"
 private const val AUTOSAVE_FILE_NAME = "Autosave"
 const val SETTINGS_FILE_NAME = "GameSettings.json"
+const val MOD_LIST_CACHE_FILE_NAME = "ModListCache.json"
 
 class UncivFiles(
     /**
@@ -142,14 +144,6 @@ class UncivFiles(
         return deleteSave(getSave(gameName))
     }
 
-    /**
-     * @return `true` if successful.
-     * @throws SecurityException when delete access was denied
-     */
-    fun deleteMultiplayerSave(gameName: String): Boolean {
-        return deleteSave(getMultiplayerSave(gameName))
-    }
-
     /**
      * Only use this with a [FileHandle] obtained by one of the methods of this class!
      *
@@ -162,6 +156,7 @@ class UncivFiles(
     }
 
     //endregion
+    
     //region Saving
 
     fun saveGame(game: GameInfo, gameName: String, saveCompletionCallback: (Exception?) -> Unit = { if (it != null) throw it }): FileHandle {
@@ -253,9 +248,6 @@ class UncivFiles(
         return gameInfoFromString(gameData)
     }
 
-    fun loadGamePreviewByName(gameName: String) =
-            loadGamePreviewFromFile(getMultiplayerSave(gameName))
-
     fun loadGamePreviewFromFile(gameFile: FileHandle): GameInfoPreview {
         return json().fromJson(GameInfoPreview::class.java, gameFile) ?: throw emptyFile(gameFile)
     }
@@ -296,6 +288,7 @@ class UncivFiles(
 
 
     //endregion
+    
     //region Settings
 
     private fun getGeneralSettingsFile(): FileHandle {
@@ -357,6 +350,34 @@ class UncivFiles(
         return game
     }
 
+    //endregion
+    
+    //region Mod caching
+    fun saveModCache(modDataList: List<ModUIData>){
+        val file = getLocalFile(MOD_LIST_CACHE_FILE_NAME)
+        try {
+            json().toJson(modDataList, file)
+        }
+        catch (ex: Exception){ // Not a huge deal if this fails
+            Log.error("Error saving mod cache", ex)
+        }
+    }
+
+
+    fun loadModCache(): List<ModUIData>{
+        val file = getLocalFile(MOD_LIST_CACHE_FILE_NAME)
+        if (!file.exists()) return emptyList()
+        try {
+            return json().fromJsonFile(Array<ModUIData>::class.java, file)
+                .toList()
+        }
+        catch (ex: Exception){ // Not a huge deal if this fails
+            Log.error("Error loading mod cache", ex)
+            return emptyList()
+        }
+    }
+
+
     //endregion
 
     companion object {

core/src/com/unciv/ui/screens/modmanager/ModManagementScreen.kt

@@ -109,8 +109,8 @@ class ModManagementScreen private constructor(
 
     // Enable re-sorting and syncing entries in 'installed' and 'repo search' ScrollPanes
     // Keep metadata and buttons in separate pools
-    private val installedModInfo = previousInstalledMods ?: HashMap(10) // HashMap<String, ModUIData> inferred
-    private val onlineModInfo = previousOnlineMods ?: HashMap(90) // HashMap<String, ModUIData> inferred
+    private val installedModInfo = previousInstalledMods ?: HashMap(10)
+    private val onlineModInfo = previousOnlineMods ?: HashMap(game.files.loadModCache().associateBy { it.name })
     private val modButtons: HashMap<ModUIData, ModDecoratedButton> = HashMap(100)
 
     // cleanup - background processing needs to be stopped on exit and memory freed
@@ -349,6 +349,10 @@ class ModManagementScreen private constructor(
             onlineModsTable.add(getCachedModButton(mod)).row()
         }
 
+        Concurrency.run("Cache mod list"){
+            game.files.saveModCache(onlineModInfo.values.toList())
+        }
+
         // Now the tasks after the 'page' of search results has been fully processed
         // The search has reached the last page!
         if (repoSearch.items.size < amountPerPage) {

core/src/com/unciv/ui/screens/modmanager/ModUIData.kt

@@ -12,14 +12,17 @@ import com.unciv.ui.components.fonts.Fonts
  *  (This is important on resize - ModUIData are passed to the new screen)
  *  Note it is guaranteed either ruleset or repo are non-null, never both.
  */
-internal class ModUIData private constructor(
+class ModUIData private constructor(
     val name: String,
     val description: String,
-    val ruleset: Ruleset?,
-    val repo: GithubAPI.Repo?,
+    val ruleset: Ruleset? = null,
+    val repo: GithubAPI.Repo? = null,
     var isVisual: Boolean = false,
     var hasUpdate: Boolean = false
 ) {
+    // For deserialization from cache file 
+    constructor():this("","")
+    
     constructor(ruleset: Ruleset, isVisual: Boolean): this (
         ruleset.name,
         ruleset.getSummary().let {
@@ -46,7 +49,7 @@ internal class ModUIData private constructor(
         else -> ""
     }
 
-    fun matchesFilter(filter: ModManagementOptions.Filter): Boolean = when {
+    internal fun matchesFilter(filter: ModManagementOptions.Filter): Boolean = when {
         !matchesCategory(filter) -> false
         filter.text.isEmpty() -> true
         name.contains(filter.text, true) -> true