feat: add logToStderr method

lib/picocli-logback-level-mixin/CHANGELOG.md

@@ -0,0 +1,14 @@
+# 0.0.3
+
+* log to stderr
+
+# 0.0.2 - `2026-07-08T10:26:32-04:00`
+
+* publish to maven central
+
+# 0.0.1
+
+* able to set verbosity as [picocli][picocli] mixin
+* move code here 
+
+[picocli]: https://picocli.info

lib/picocli-logback-level-mixin/src/main/java/info/ankin/projects/picocli/logback/verbosity/LogbackVerbosityMixin.java

@@ -3,6 +3,8 @@
 import ch.qos.logback.classic.Level;
 import ch.qos.logback.classic.Logger;
 import ch.qos.logback.classic.LoggerContext;
+import ch.qos.logback.classic.spi.ILoggingEvent;
+import ch.qos.logback.core.ConsoleAppender;
 import lombok.*;
 import lombok.experimental.Accessors;
 import org.slf4j.LoggerFactory;
@@ -14,9 +16,9 @@
 @Accessors(chain = true)
 @ToString(onlyExplicitlyIncluded = true)
 @EqualsAndHashCode(onlyExplicitlyIncluded = true)
 public class LogbackVerbosityMixin {
     public static final List<Level> LEVELS = List.of(Level.OFF, Level.ERROR, Level.WARN, Level.INFO, Level.DEBUG, Level.TRACE);
     public static final int DEFAULT_LEVEL = 2;
 
     @Getter(AccessLevel.NONE)
     @Setter(AccessLevel.NONE)
@@ -27,20 +29,28 @@
     @Setter(AccessLevel.NONE)
     int verbosity;
 
     public LogbackVerbosityMixin() {
         this(LEVELS.get(DEFAULT_LEVEL));
     }
 
     public LogbackVerbosityMixin(Level defaultLevel) {
         rootLogger = ((LoggerContext) LoggerFactory.getILoggerFactory()).getLogger(Logger.ROOT_LOGGER_NAME);
         rootLogger.setLevel(defaultLevel);
     }
 
+    public static void logToStderr() {
+        ((LoggerContext) LoggerFactory.getILoggerFactory()).getLogger(Logger.ROOT_LOGGER_NAME).iteratorForAppenders().forEachRemaining(a -> {
+            if (a instanceof ConsoleAppender<ILoggingEvent> c) {
+                c.setOutputStream(System.err);
+            }
+        });
+    }
+
     @CommandLine.Option(
             names = {"-v", "--verbose"},
             description = "Increase verbosity. Specify multiple times to increase (-vvv)."
     )
     public void verbosity(boolean[] verbosity) {
         // default is warn, for every other one, set it
         int delta = 0;
         for (boolean b : verbosity) {
@@ -50,7 +60,7 @@
         setVerbosity(delta);
     }
 
     public void setVerbosity(int verbosity) {
         this.verbosity = verbosity;
         int newLevel = DEFAULT_LEVEL + verbosity;
         int legalNewLevel = newLevel < 0

lib/picocli-logback-level-mixin/version.txt

@@ -1 +1 @@
-0.0.2
+0.0.3-SNAPSHOT