use dev.dirs to calculate terasology directories

the library works according to the XDG standard, and offers translations
for linux, macosx, windows. see for details:

https://github.com/dirs-dev/directories-jvm

fixes #5281.

engine/build.gradle.kts

@@ -61,6 +61,7 @@ dependencies {
     api("com.google.guava:guava:31.0-jre")
     api("com.google.code.gson:gson:2.8.6")
     api("net.sf.trove4j:trove4j:3.0.3")
+    implementation("dev.dirs:directories:26")
     implementation("io.netty:netty-all:4.1.77.Final")
     implementation("com.google.protobuf:protobuf-java:3.22.0")
     implementation("org.lz4:lz4-java:1.8.0")

engine/src/main/java/org/terasology/engine/core/PathManager.java

@@ -4,8 +4,7 @@
 package org.terasology.engine.core;
 
 import com.google.common.collect.ImmutableList;
-import com.sun.jna.platform.win32.KnownFolders;
-import com.sun.jna.platform.win32.Shell32Util;
+import dev.dirs.ProjectDirectories;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.terasology.engine.context.Context;
@@ -33,15 +32,14 @@
  */
 public final class PathManager {
     private static final Logger LOGGER = LoggerFactory.getLogger(PathManager.class);
-    private static final String TERASOLOGY_FOLDER_NAME = "Terasology";
-    private static final Path LINUX_HOME_SUBPATH = Paths.get(".local", "share", "terasology");
-
+    private static final ProjectDirectories projDirs = ProjectDirectories.from("org", "terasology", "terasology");
+    private static final Path PROJECT_PATH = Paths.get(projDirs.dataDir);
     private static final String SAVED_GAMES_DIR = "saves";
     private static final String RECORDINGS_LIBRARY_DIR = "recordings";
-    private static final String LOG_DIR = "logs";
-    private static final String SHADER_LOG_DIR = "shaders";
+    private static final String LOG_DIR = projDirs.dataLocalDir + "/logs";
+    private static final String SHADER_LOG_DIR = projDirs.dataLocalDir + "/shaders";
     private static final String MODULE_DIR = "modules";
-    private static final String MODULE_CACHE_DIR = "cachedModules";
+    private static final String MODULE_CACHE_DIR = projDirs.cacheDir + "/cachedModules";
     private static final String SCREENSHOT_DIR = "screenshots";
     private static final String NATIVES_DIR = "natives";
     private static final String CONFIGS_DIR = "configs";
@@ -67,7 +65,7 @@ public final class PathManager {
 
     private PathManager() {
         installPath = findInstallPath();
-        homePath = installPath;
+        homePath = PROJECT_PATH;
     }
 
     private static Path findInstallPath() {
@@ -159,7 +157,11 @@ static PathManager setInstance(PathManager pathManager) {
     }
 
     /**
-     * Uses the given path as the home instead of the default home path.
+     * Uses the given path as the home instead of the default home path. Especially interesting for unit tests, as java>17 does not
+     * make it easy to set environment variables. see: https://www.baeldung.com/java-unit-testing-environment-variables .
+     *
+     * Currently LOG_DIR and LOG_SHADER_DIR are not affected here, as not based on homePath.
+     *
      * @param rootPath Path to use as the home path.
      * @throws IOException Thrown when required directories cannot be accessed.
      */
@@ -173,33 +175,8 @@ public void useOverrideHomePath(Path rootPath) throws IOException {
      * @throws IOException Thrown when required directories cannot be accessed.
      */
     public void useDefaultHomePath() throws IOException {
-        switch (OS.get()) {
-            case LINUX:
-                homePath = Paths.get(System.getProperty("user.home")).resolve(LINUX_HOME_SUBPATH);
-                break;
-            case MACOSX:
-                homePath = Paths.get(System.getProperty("user.home"), "Library", "Application Support", TERASOLOGY_FOLDER_NAME);
-                break;
-            case WINDOWS:
-                String savedGamesPath = Shell32Util
-                    .getKnownFolderPath(KnownFolders.FOLDERID_SavedGames);
-                if (savedGamesPath == null) {
-                    savedGamesPath = Shell32Util
-                        .getKnownFolderPath(KnownFolders.FOLDERID_Documents);
-                }
-                Path rawPath;
-                if (savedGamesPath != null) {
-                    rawPath = Paths.get(savedGamesPath);
-                } else {
-                    rawPath = new JFileChooser().getFileSystemView().getDefaultDirectory()
-                        .toPath();
-                }
-                homePath = rawPath.resolve(TERASOLOGY_FOLDER_NAME);
-                break;
-            default:
-                homePath = Paths.get(System.getProperty("user.home")).resolve(LINUX_HOME_SUBPATH);
-                break;
-        }
+        // use datadir, .local/share for linux e.g.
+        homePath = PROJECT_PATH;
         updateDirs();
     }
 
@@ -316,8 +293,8 @@ public Path getSandboxPath() {
     private void updateDirs() throws IOException {
         savesPath = homePath.resolve(SAVED_GAMES_DIR);
         recordingsPath = homePath.resolve(RECORDINGS_LIBRARY_DIR);
-        logPath = homePath.resolve(LOG_DIR);
-        shaderLogPath = logPath.resolve(SHADER_LOG_DIR);
+        logPath = Paths.get(LOG_DIR);
+        shaderLogPath = Paths.get(SHADER_LOG_DIR);
         screenshotPath = homePath.resolve(SCREENSHOT_DIR);
         nativesPath = installPath.resolve(NATIVES_DIR);
         configsPath = homePath.resolve(CONFIGS_DIR);

engine/src/main/java/org/terasology/engine/core/TerasologyEngine.java

@@ -270,6 +270,7 @@ private void logEnvironmentInfo() {
         logger.info("{}", TerasologyVersion.getInstance());
         logger.info("Home path: {}", PathManager.getInstance().getHomePath());
         logger.info("Install path: {}", PathManager.getInstance().getInstallPath());
+        logger.info("Log path: {}", PathManager.getInstance().getLogPath());
         logger.info("Java: {} in {}", System.getProperty("java.version"), System.getProperty("java.home"));
         logger.info("Java VM: {}, version: {}", System.getProperty("java.vm.name"), System.getProperty("java.vm" +
                 ".version"));

facades/PC/src/main/java/org/terasology/engine/Terasology.java

@@ -274,14 +274,7 @@ private void handleLaunchArguments() throws IOException {
             setMemoryLimit(maxDataSize);
         }
 
-        if (homeDir != null) {
-            logger.info("homeDir is {}", homeDir);
-            PathManager.getInstance().useOverrideHomePath(homeDir);
-            // TODO: what is this?
-            //   PathManager.getInstance().chooseHomePathManually();
-        } else {
-            PathManager.getInstance().useDefaultHomePath();
-        }
+        PathManager.getInstance().useDefaultHomePath();
 
         if (isHeadless) {
             crashReportEnabled = false;