Addition of Logger.getAll() method as discussed in #970

lib/winston/container.js

@@ -65,6 +65,19 @@ module.exports = class Container {
     return this.add(id, options);
   }
 
+  /**
+   * Retreives all `winston.Logger` instances for the specified `regex`.
+   * @param {!string} regex - The regex for filtering the Loggers to get.
+   * @returns {Map<Logger>} - A Map of Logger instances matching the regex.
+   */
+  getAll(regex) {
+    if (regex) {
+      return new Map([...this.loggers].filter(([key]) => key.match(regex)));
+    }
+
+    return this.loggers;
+  }
+
   /**
    * Check if the container has a logger with the id.
    * @param {?string} id - The id of the Logger instance to find.

test/unit/winston/container.test.js

@@ -23,6 +23,29 @@ describe('Container', function () {
       assume(container.get('default-test')).equals(defaultTest);
     });
 
+    it('.getAll(default-test)', function () {
+      container.add('appLogger');
+      container.add('serviceLogger');
+
+      var allLogger = container.getAll();
+      var appLogger = container.getAll(/^app/);
+      var matchLogg = container.getAll(/Logger$/);
+      var emptyLogg = container.getAll(/Library/);
+
+      assume(allLogger.size).equals(3);
+      assume(allLogger.has('appLogger')).true();
+      assume(allLogger.has('serviceLogger')).true();
+
+      assume(appLogger.size).equals(1);
+      assume(appLogger.has('appLogger')).true();
+
+      assume(matchLogg.size).equals(2);
+      assume(matchLogg.has('appLogger')).true();
+      assume(matchLogg.has('serviceLogger')).true();
+
+      assume(emptyLogg.size).equals(0);
+    });
+
     it('.has(default-test)', function () {
       assume(container.has('default-test')).true();
     });