Auto-detect ansi support for log4j2

move to fml.loading subpackage

Add license header

src/fmllauncher/java/net/minecraftforge/fml/loading/log4j/ForgeHighlight.java

@@ -0,0 +1,73 @@
+/*
+ * Minecraft Forge
+ * Copyright (c) 2016-2020.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation version 2.1
+ * of the License.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+package net.minecraftforge.fml.loading.log4j;
+
+import net.minecrell.terminalconsole.HighlightErrorConverter;
+import net.minecrell.terminalconsole.TerminalConsoleAppender;
+import org.apache.logging.log4j.Logger;
+import org.apache.logging.log4j.core.config.Configuration;
+import org.apache.logging.log4j.core.config.plugins.Plugin;
+import org.apache.logging.log4j.core.pattern.ConverterKeys;
+import org.apache.logging.log4j.core.pattern.HighlightConverter;
+import org.apache.logging.log4j.core.pattern.PatternConverter;
+import org.apache.logging.log4j.status.StatusLogger;
+import org.apache.logging.log4j.util.PerformanceSensitive;
+
+import javax.annotation.Nullable;
+import java.lang.reflect.Method;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+/**
+ * A wrapper for {@link HighlightConverter} that auto-disables ANSI when the terminal doesn't support it.
+ * Ansi support is determined by TerminalConsoleAppender
+ */
+@Plugin(name = "highlightForge", category = PatternConverter.CATEGORY)
+@ConverterKeys("highlightForge")
+@PerformanceSensitive("allocation")
+public class ForgeHighlight {
+    protected static final Logger LOGGER = StatusLogger.getLogger();
+
+    /**
+     * Gets a new instance of the {@link HighlightErrorConverter} with the
+     * specified options.
+     *
+     * @param config The current configuration
+     * @param options The pattern options
+     * @return The new instance
+     */
+    public static @Nullable HighlightConverter newInstance(Configuration config, String[] options) {
+        try {
+            Method method = TerminalConsoleAppender.class.getDeclaredMethod("initializeTerminal");
+            method.setAccessible(true);
+            method.invoke(null);
+        } catch (ReflectiveOperationException e) {
+            LOGGER.warn("Failed to invoke initializeTerminal on TCA", e);
+        }
+        if (!TerminalConsoleAppender.isAnsiSupported() && Arrays.stream(options).noneMatch(s -> s.equals("disableAnsi=true"))) {
+            List<String> optionList = new ArrayList<>();
+            optionList.add(options[0]);
+            optionList.add("disableAnsi=true");
+            options = optionList.toArray(new String[0]);
+        }
+        return HighlightConverter.newInstance(config, options);
+    }
+}

src/fmllauncher/resources/log4j2.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<Configuration status="warn" packages="net.minecrell.terminalconsole,net.minecrell.terminalconsole.util,com.mojang.util,cpw.mods.modlauncher.log" shutdownHook="disable">
+<Configuration status="warn" packages="net.minecrell.terminalconsole,net.minecrell.terminalconsole.util,com.mojang.util,cpw.mods.modlauncher.log,net.minecraftforge.fml.loading.log4j" shutdownHook="disable">
     <filters>
         <ThresholdFilter level="WARN" onMatch="ACCEPT" onMismatch="NEUTRAL"/>
         <MarkerFilter marker="NETWORK_PACKETS" onMatch="${sys:forge.logging.marker.networking:-DENY}" onMismatch="NEUTRAL"/>
@@ -20,10 +20,10 @@
     <Appenders>
         <TerminalConsole name="Console">
             <PatternLayout>
-                <LoggerNamePatternSelector defaultPattern="%highlight{[%d{HH:mm:ss}] [%t/%level] [%c{2.}/%markerSimpleName]: %minecraftFormatting{%msg}%n%tEx}">
+                <LoggerNamePatternSelector defaultPattern="%highlightForge{[%d{HH:mm:ss}] [%t/%level] [%c{2.}/%markerSimpleName]: %minecraftFormatting{%msg}%n%tEx}">
                     <!-- don't include the full logger name for Mojang's logs since they use full class names and it's very verbose -->
-                    <PatternMatch key="net.minecraft." pattern="%highlight{[%d{HH:mm:ss}] [%t/%level] [minecraft/%logger{1}]: %minecraftFormatting{%msg}%n%tEx}"/>
+                    <PatternMatch key="net.minecraft." pattern="%highlightForge{[%d{HH:mm:ss}] [%t/%level] [minecraft/%logger{1}]: %minecraftFormatting{%msg}%n%tEx}"/>
-                    <PatternMatch key="com.mojang." pattern="%highlight{[%d{HH:mm:ss}] [%t/%level] [mojang/%logger{1}]: %minecraftFormatting{%msg}%n%tEx}"/>
+                    <PatternMatch key="com.mojang." pattern="%highlightForge{[%d{HH:mm:ss}] [%t/%level] [mojang/%logger{1}]: %minecraftFormatting{%msg}%n%tEx}"/>
                 </LoggerNamePatternSelector>
             </PatternLayout>
         </TerminalConsole>