1 files changed, 134 insertions, 0 deletions
diff --git a/libraries/launcher/org/prismlauncher/utils/logging/Log.java b/libraries/launcher/org/prismlauncher/utils/logging/Log.java
new file mode 100644
index 00000000..e1961991
--- /dev/null
+++ b/libraries/launcher/org/prismlauncher/utils/logging/Log.java
@@ -0,0 +1,134 @@
+// SPDX-License-Identifier: GPL-3.0-only
+/*
+ *  PolyMC - Minecraft Launcher
+ *  Copyright (C) 2022 TheKodeToad <TheKodeToad@proton.me>
+ *
+ *  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/>.
+ */
+
+package org.prismlauncher.utils.logging;
+
+import java.io.PrintStream;
+
+/**
+ * Used to print messages with different levels used to colourise the output.
+ * Used instead of a logging framework, as the launcher knows how to parse these
+ * messages.
+ */
+public final class Log {
+
+    private static final PrintStream ERROR_PREFIX = new PrintStream(System.err) {
+        @Override
+        public void println(String x) {
+            error(x);
+        }
+
+        @Override
+        public void println(Object x) {
+            error(String.valueOf(x));
+        }
+    }, FATAL_PREFIX = new PrintStream(System.err) {
+        @Override
+        public void println(String x) {
+            fatal(x);
+        }
+
+        @Override
+        public void println(Object x) {
+            fatal(String.valueOf(x));
+        }
+    };
+
+    private static final boolean DEBUG = Boolean.getBoolean("org.prismlauncher.debug");
+
+    private Log() {
+    }
+
+    public static void blankLine() {
+        System.out.println();
+    }
+
+    public static void launcher(String message) {
+        log(message, Level.LAUNCHER);
+    }
+
+    public static void error(String message) {
+        log(message, Level.ERROR);
+    }
+
+    public static void debug(String message) {
+        if (!DEBUG)
+            return;
+
+        log(message, Level.DEBUG);
+    }
+
+    public static void info(String message) {
+        log(message, Level.INFO);
+    }
+
+    public static void warning(String message) {
+        log(message, Level.WARNING);
+    }
+
+    public static void error(String message, Throwable e) {
+        error(message);
+        e.printStackTrace(ERROR_PREFIX);
+    }
+
+    public static void fatal(String message) {
+        log(message, Level.FATAL);
+    }
+
+    public static void fatal(String message, Throwable e) {
+        fatal(message);
+        e.printStackTrace(FATAL_PREFIX);
+    }
+
+    /**
+     * Logs a message with the prefix !![LEVEL]!.
+     *
+     * @param message The message
+     * @param level   The level
+     */
+    public static void log(String message, Level level) {
+        String prefix = "!![" + level.name + "]!";
+        // prefix first line
+        message = prefix + message;
+        // prefix subsequent lines
+        message = message.replace("\n", "\n" + prefix);
+
+        if (level.stderr)
+            System.err.println(message);
+        else
+            System.out.println(message);
+    }
+
+}