支持愚人节模式

HMCL/src/main/java/org/jackhuang/hmcl/Launcher.java

@@ -31,15 +31,12 @@
 import org.jackhuang.hmcl.setting.ConfigHolder;
 import org.jackhuang.hmcl.setting.SambaException;
 import org.jackhuang.hmcl.ui.FXUtils;
-import org.jackhuang.hmcl.util.FileSaver;
+import org.jackhuang.hmcl.util.*;
 import org.jackhuang.hmcl.task.AsyncTaskExecutor;
 import org.jackhuang.hmcl.task.Schedulers;
 import org.jackhuang.hmcl.ui.Controllers;
 import org.jackhuang.hmcl.upgrade.UpdateChecker;
 import org.jackhuang.hmcl.upgrade.UpdateHandler;
-import org.jackhuang.hmcl.util.CrashReporter;
-import org.jackhuang.hmcl.util.Lang;
-import org.jackhuang.hmcl.util.StringUtils;
 import org.jackhuang.hmcl.util.io.JarUtils;
 import org.jackhuang.hmcl.util.platform.Architecture;
 import org.jackhuang.hmcl.util.platform.CommandBuilder;

HMCL/src/main/java/org/jackhuang/hmcl/setting/Config.java

@@ -237,6 +237,21 @@ public void setDisableAutoShowUpdateDialog(boolean disableAutoShowUpdateDialog)
         this.disableAutoShowUpdateDialog.set(disableAutoShowUpdateDialog);
     }
 
+    @SerializedName("disableAprilFools")
+    private final BooleanProperty disableAprilFools = new SimpleBooleanProperty(false);
+
+    public BooleanProperty disableAprilFoolsProperty() {
+        return disableAprilFools;
+    }
+
+    public boolean isDisableAprilFools() {
+        return disableAprilFools.get();
+    }
+
+    public void setDisableAprilFools(boolean disableAprilFools) {
+        this.disableAprilFools.set(disableAprilFools);
+    }
+
     @SerializedName("shownTips")
     private final ObservableMap<String, Object> shownTips = FXCollections.observableHashMap();
 

HMCL/src/main/java/org/jackhuang/hmcl/ui/Controllers.java

@@ -225,6 +225,8 @@ public static void onApplicationStop() {
     public static void initialize(Stage stage) {
         LOG.info("Start initializing application");
 
+        LOG.info("April Fools: " + AprilFools.isEnabled());
+
         if (System.getProperty("prism.lcdtext") == null) {
             String fontAntiAliasing = globalConfig().getFontAntiAliasing();
             if ("lcd".equalsIgnoreCase(fontAntiAliasing)) {

HMCL/src/main/java/org/jackhuang/hmcl/ui/main/SettingsPage.java

@@ -45,6 +45,7 @@
 import org.jackhuang.hmcl.upgrade.UpdateChannel;
 import org.jackhuang.hmcl.upgrade.UpdateChecker;
 import org.jackhuang.hmcl.upgrade.UpdateHandler;
+import org.jackhuang.hmcl.util.AprilFools;
 import org.jackhuang.hmcl.util.StringUtils;
 import org.jackhuang.hmcl.util.i18n.I18n;
 import org.jackhuang.hmcl.util.i18n.SupportedLocale;
@@ -224,6 +225,14 @@ public SettingsPage() {
                 settingsPane.getContent().add(disableAutoShowUpdateDialogPane);
             }
 
+            if (AprilFools.isStartInAprilFoolsDay()) {
+                LineToggleButton disableAprilFools = new LineToggleButton();
+                disableAprilFools.setTitle("不启用愚人节功能");
+                // disableAprilFools.setSubtitle("在愚人节当天，HMCL会自动启动一个特殊的版本，以庆祝愚人节。");
+                disableAprilFools.selectedProperty().bindBidirectional(config().disableAprilFoolsProperty());
+                settingsPane.getContent().add(disableAprilFools);
+            }
+
             {
                 MultiFileItem<EnumCommonDirectory> fileCommonLocation = new MultiFileItem<>();
                 fileCommonLocation.loadChildren(Arrays.asList(

HMCL/src/main/java/org/jackhuang/hmcl/util/AprilFools.java

@@ -0,0 +1,54 @@
+/*
+ * Hello Minecraft! Launcher
+ * Copyright (C) 2026 huangyuhui <huanghongxun2008@126.com> and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package org.jackhuang.hmcl.util;
+
+import org.jackhuang.hmcl.setting.ConfigHolder;
+
+import java.time.LocalDate;
+import java.time.Month;
+
+public final class AprilFools {
+
+    private static final boolean START_IN_APRIL_FOOLS_DAY;
+    private static final boolean ENABLED;
+
+    static {
+        var date = LocalDate.now();
+        START_IN_APRIL_FOOLS_DAY = date.getMonth() == Month.APRIL && date.getDayOfMonth() == 1;
+
+        String value = System.getProperty("hmcl.april_fools", System.getenv("HMCL_APRIL_FOOLS"));
+        if ("true".equalsIgnoreCase(value)) {
+            ENABLED = true;
+        } else if ("false".equalsIgnoreCase(value) || ConfigHolder.config().isDisableAprilFools()) {
+            ENABLED = false;
+        } else {
+            ENABLED = START_IN_APRIL_FOOLS_DAY;
+        }
+    }
+
+    public static boolean isStartInAprilFoolsDay() {
+        return START_IN_APRIL_FOOLS_DAY;
+    }
+
+    public static boolean isEnabled() {
+        return ENABLED;
+    }
+
+    private AprilFools() {
+    }
+}