Add support for rendering exceptions

src/Spectre.Console/Extensions/AnsiConsoleExtensions.Exceptions.cs

@@ -0,0 +1,21 @@
+using System;
+
+namespace Spectre.Console
+{
+    /// <summary>
+    /// Contains extension methods for <see cref="IAnsiConsole"/>.
+    /// </summary>
+    public static partial class AnsiConsoleExtensions
+    {
+        /// <summary>
+        /// Writes an exception to the console.
+        /// </summary>
+        /// <param name="console">The console.</param>
+        /// <param name="exception">The exception to write to the console.</param>
+        /// <param name="format">The exception format options.</param>
+        public static void WriteException(this IAnsiConsole console, Exception exception, ExceptionFormats format = ExceptionFormats.None)
+        {
+            Render(console, exception.GetRenderable(format));
+        }
+    }
+}

src/Spectre.Console/Extensions/AnsiConsoleExtensions.Rendering.cs

@@ -27,10 +27,9 @@ namespace Spectre.Console
             }
 
             var options = new RenderContext(console.Encoding, console.Capabilities.LegacyConsole);
-            var segments = renderable.Render(options, console.Width).Where(x => !(x.Text.Length == 0 && !x.IsLineBreak)).ToArray();
+            var segments = renderable.Render(options, console.Width).ToArray();
             segments = Segment.Merge(segments).ToArray();
 
-            var current = Style.Plain;
             foreach (var segment in segments)
             {
                 if (string.IsNullOrEmpty(segment.Text))

src/Spectre.Console/Extensions/ExceptionExtensions.cs

@@ -0,0 +1,22 @@
+using System;
+using Spectre.Console.Rendering;
+
+namespace Spectre.Console
+{
+    /// <summary>
+    /// Contains extension methods for <see cref="Exception"/>.
+    /// </summary>
+    public static class ExceptionExtensions
+    {
+        /// <summary>
+        /// Gets a <see cref="IRenderable"/> representation of the exception.
+        /// </summary>
+        /// <param name="exception">The exception to format.</param>
+        /// <param name="format">The exception format options.</param>
+        /// <returns>A <see cref="IRenderable"/> representing the exception.</returns>
+        public static IRenderable GetRenderable(this Exception exception, ExceptionFormats format = ExceptionFormats.None)
+        {
+            return ExceptionFormatter.Format(exception, format);
+        }
+    }
+}

src/Spectre.Console/Extensions/StringExtensions.cs

@@ -0,0 +1,26 @@
+namespace Spectre.Console
+{
+    /// <summary>
+    /// Contains extension methods for <see cref="string"/>.
+    /// </summary>
+    public static class StringExtensions
+    {
+        /// <summary>
+        /// Converts the string to something that is safe to
+        /// use in a markup string.
+        /// </summary>
+        /// <param name="text">The text to convert.</param>
+        /// <returns>A string that is safe to use in a markup string.</returns>
+        public static string SafeMarkup(this string text)
+        {
+            if (text == null)
+            {
+                return string.Empty;
+            }
+
+            return text
+                .Replace("[", "[[")
+                .Replace("]", "]]");
+        }
+    }
+}