1 files changed, 164 insertions, 0 deletions
diff --git a/libraries/launcher/org/prismlauncher/EntryPoint.java b/libraries/launcher/org/prismlauncher/EntryPoint.java
new file mode 100644
index 00000000..9144e1f1
--- /dev/null
+++ b/libraries/launcher/org/prismlauncher/EntryPoint.java
@@ -0,0 +1,164 @@
+// SPDX-License-Identifier: GPL-3.0-only
+/*
+ *  PolyMC - Minecraft Launcher
+ *  Copyright (C) 2022 icelimetea, <fr3shtea@outlook.com>
+ *
+ *  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, version 3.
+ *
+ *  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.
+ *
+ *  Linking this library statically or dynamically with other modules is
+ *  making a combined work based on this library. Thus, the terms and
+ *  conditions of the GNU General Public License cover the whole
+ *  combination.
+ *
+ *  As a special exception, the copyright holders of this library give
+ *  you permission to link this library with independent modules to
+ *  produce an executable, regardless of the license terms of these
+ *  independent modules, and to copy and distribute the resulting
+ *  executable under terms of your choice, provided that you also meet,
+ *  for each linked independent module, the terms and conditions of the
+ *  license of that module. An independent module is a module which is
+ *  not derived from or based on this library. If you modify this
+ *  library, you may extend this exception to your version of the
+ *  library, but you are not obliged to do so. If you do not wish to do
+ *  so, delete this exception statement from your version.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ * This file incorporates work covered by the following copyright and
+ * permission notice:
+ *
+ *      Copyright 2013-2021 MultiMC Contributors
+ *
+ *      Licensed under the Apache License, Version 2.0 (the "License");
+ *      you may not use this file except in compliance with the License.
+ *      You may obtain a copy of the License at
+ *
+ *          http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *      Unless required by applicable law or agreed to in writing, software
+ *      distributed under the License is distributed on an "AS IS" BASIS,
+ *      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *      See the License for the specific language governing permissions and
+ *      limitations under the License.
+ */
+
+package org.prismlauncher;
+
+import org.prismlauncher.exception.ParseException;
+import org.prismlauncher.utils.Parameters;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.nio.charset.StandardCharsets;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+public final class EntryPoint {
+
+    private static final Logger LOGGER = Logger.getLogger("EntryPoint");
+
+    private final Parameters params = new Parameters();
+
+    public static void main(String[] args) {
+        EntryPoint listener = new EntryPoint();
+
+        int retCode = listener.listen();
+
+        if (retCode != 0) {
+            LOGGER.info("Exiting with " + retCode);
+
+            System.exit(retCode);
+        }
+    }
+
+    private Action parseLine(String inData) throws ParseException {
+        String[] tokens = inData.split("\\s+", 2);
+
+        if (tokens.length == 0)
+            throw new ParseException("Unexpected empty string!");
+
+        switch (tokens[0]) {
+            case "launch": {
+                return Action.Launch;
+            }
+
+            case "abort": {
+                return Action.Abort;
+            }
+
+            default: {
+                if (tokens.length != 2)
+                    throw new ParseException("Error while parsing:" + inData);
+
+                params.add(tokens[0], tokens[1]);
+
+                return Action.Proceed;
+            }
+        }
+    }
+
+    public int listen() {
+        Action action = Action.Proceed;
+
+        try (BufferedReader reader = new BufferedReader(new InputStreamReader(
+                System.in,
+                StandardCharsets.UTF_8
+        ))) {
+            String line;
+
+            while (action == Action.Proceed) {
+                if ((line = reader.readLine()) != null) {
+                    action = parseLine(line);
+                } else {
+                    action = Action.Abort;
+                }
+            }
+        } catch (IOException | ParseException e) {
+            LOGGER.log(Level.SEVERE, "Launcher ABORT due to exception:", e);
+
+            return 1;
+        }
+
+        // Main loop
+        if (action == Action.Abort) {
+            LOGGER.info("Launch aborted by the launcher.");
+
+            return 1;
+        }
+
+        try {
+            Launcher launcher =
+                    LauncherFactory
+                            .getInstance()
+                            .createLauncher(params);
+
+            launcher.launch();
+
+            return 0;
+        } catch (IllegalArgumentException e) {
+            LOGGER.log(Level.SEVERE, "Wrong argument.", e);
+
+            return 1;
+        } catch (Exception e) {
+            LOGGER.log(Level.SEVERE, "Exception caught from launcher.", e);
+
+            return 1;
+        }
+    }
+
+    private enum Action {
+        Proceed,
+        Launch,
+        Abort
+    }
+
+}