added LogWriter class

ExtremelySimpleLogger/LogWriter.cs

@@ -0,0 +1,82 @@
+using System;
+using System.IO;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ExtremelySimpleLogger {
+    /// <summary>
+    /// Implementation of a <see cref="TextWriter"/> that writes to a <see cref="Logger"/>.
+    /// </summary>
+    public class LogWriter : TextWriter {
+
+        /// <summary>
+        /// The log level that this log writer should write with.
+        /// </summary>
+        public LogLevel Level {
+            get {
+                lock (this.logger)
+                    return this.level;
+            }
+            set {
+                lock (this.logger)
+                    this.level = value;
+            }
+        }
+
+        /// <inheritdoc />
+        public override Encoding Encoding => Encoding.UTF8;
+
+        private readonly StringBuilder line = new StringBuilder();
+        private readonly Logger logger;
+
+        private LogLevel level;
+
+        /// <summary>
+        /// Creates a new log writer with the given settings.
+        /// </summary>
+        /// <param name="logger">The logger to write to.</param>
+        /// <param name="level">The log level to write with.</param>
+        public LogWriter(Logger logger, LogLevel level = LogLevel.Info) {
+            this.logger = logger;
+            this.level = level;
+        }
+
+        /// <inheritdoc />
+        public override void Write(char value) {
+            lock (this.logger)
+                this.line.Append(value);
+        }
+
+        /// <inheritdoc />
+        public override void Write(char[] buffer, int index, int count) {
+            lock (this.logger)
+                this.line.Append(buffer, index, count);
+        }
+
+        /// <inheritdoc />
+        public override void Write(string value) {
+            lock (this.logger)
+                this.line.Append(value);
+        }
+
+        /// <inheritdoc />
+        public override void WriteLine(string value) {
+            this.Write(value);
+            this.WriteLine();
+        }
+
+        /// <inheritdoc />
+        public override void WriteLine() {
+            this.Flush();
+        }
+
+        /// <inheritdoc />
+        public override void Flush() {
+            lock (this.logger) {
+                this.logger.Log(this.level, this.line);
+                this.line.Clear();
+            }
+        }
+
+    }
+}

Sample/Program.cs

@@ -39,6 +39,12 @@ namespace Sample {
             logger.Log(LogLevel.Trace, "This is a message that only the file sink will receive, since its minimum level is lower.");
             logger.Log(LogLevel.Info, "The program finished.");
 
+            // we can also use a writer to write to the log
+            Console.SetError(new LogWriter(logger, LogLevel.Warn));
+            Console.Error.WriteLine("This is an error written through serr! Oh no!");
+            Console.Error.Write("This is another error, but ");
+            Console.Error.WriteLine("written in multiple parts!");
+
             // Once we're done using the logger, we can dispose it so that our FileSink instances free their files
             logger.Dispose();
         }