Use regex for checking for the presence of plugin tags

src/main/java/com/github/games647/colorconsole/bukkit/ColorPluginAppender.java

@@ -37,11 +37,6 @@ public class ColorPluginAppender extends ColorAppender {
     @Override
     public LogEvent onAppend(LogEvent logEvent) {
         String oldMessage = logEvent.getMessage().getFormattedMessage();
-        if (logEvent.getLoggerName().isEmpty()) {
-            // ignore non logging messages like command output
-            return logEvent;
-        }
-
         String prefix = '[' + logEvent.getLoggerName() + "] ";
 
         //PaperSpigot append prefix

src/main/java/com/github/games647/colorconsole/bungee/ColorPluginAppender.java

@@ -27,11 +27,6 @@ public class ColorPluginAppender extends ColorAppender {
     public LogEvent onAppend(LogEvent logEvent) {
         String message = logEvent.getMessage().getFormattedMessage();
         String loggerName = logEvent.getLoggerName();
-        if (logEvent.getLoggerName().isEmpty()) {
-            // ignore non logging messages like command output
-            return logEvent;
-        }
-
         //old message + potential prefix and color codes
         StringBuilder msgBuilder = new StringBuilder(message.length() + loggerName.length() + 10);
         if (!PROXY_PREFIX.equals(loggerName)) {

src/main/java/com/github/games647/colorconsole/common/CommonFormatter.java

@@ -10,6 +10,7 @@ import java.util.Arrays;
 import java.util.Collection;
 import java.util.Map;
 import java.util.Set;
+import java.util.regex.Pattern;
 
 import org.fusesource.jansi.Ansi;
 import org.fusesource.jansi.Ansi.Attribute;
@@ -21,7 +22,10 @@ public class CommonFormatter {
     //copied from AnsiEscape in order to provide compatibility with older Minecraft versions
     private static final String CSI = "\u001b[";
     private static final char SUFFIX = 'm';
-    private final String reset = Ansi.ansi().a(Ansi.Attribute.RESET).toString();
+
+    private static final Pattern TAG_PATTERN = Pattern.compile("^\\[.+\\].*$");
+
+    private final String reset = Ansi.ansi().a(Attribute.RESET).toString();
 
     private final Set<String> ignoreMessages;
     private final boolean truncateColor;
@@ -63,6 +67,9 @@ public class CommonFormatter {
 
     public String colorizePluginTag(String message) {
         String newMessage = message;
+        if (!TAG_PATTERN.matcher(message).matches()) {
+            return newMessage;
+        }
 
         String startingColorCode = "";
         if (message.startsWith(CSI)) {

src/test/java/com/github/games647/colorconsole/common/CommonFormatterTest.java

@@ -39,6 +39,33 @@ public class CommonFormatterTest {
         assertThat(formatter.colorizePluginTag("[TestPlugin] msg"), is(expected));
     }
 
+    @Test
+    public void testColorizePluginTagNotPresentRight() {
+        loadPluginColors();
+
+        // unmodified
+        String msg = "[TestPlugin msg";
+        assertThat(formatter.colorizePluginTag(msg), is(msg));
+    }
+
+    @Test
+    public void testColorizePluginTagNotPresentLeft() {
+        loadPluginColors();
+
+        // unmodified
+        String msg = "TestPlugin] msg";
+        assertThat(formatter.colorizePluginTag(msg), is(msg));
+    }
+
+    @Test
+    public void testColorizePluginTagWrongOrder() {
+        loadPluginColors();
+
+        // unmodified
+        String msg = "]TestPlugin[ msg";
+        assertThat(formatter.colorizePluginTag(msg), is(msg));
+    }
+
     @Test
     public void testColorizeNameDefault() {
         loadPluginColors();