Add MarkdownViewer

QuickLook.Plugin/QuickLook.Plugin.MarkdownViewer/Plugin.cs

@@ -0,0 +1,67 @@
+using System;
+using System.IO;
+using System.Windows;
+using QuickLook.Plugin.HtmlViewer;
+
+namespace QuickLook.Plugin.MarkdownViewer
+{
+    public class Plugin : IViewer
+    {
+        private WebkitPanel _panel;
+
+        public int Priority => int.MaxValue;
+
+        public bool CanHandle(string path)
+        {
+            if (Directory.Exists(path))
+                return false;
+
+            switch (Path.GetExtension(path).ToLower())
+            {
+                case ".md":
+                    return true;
+
+                default:
+                    return false;
+            }
+        }
+
+        public void Prepare(string path, ContextObject context)
+        {
+            context.PreferredSize = new Size(800, 800);
+
+            context.Focusable = true;
+        }
+
+        public void View(string path, ContextObject context)
+        {
+            _panel = new WebkitPanel();
+            context.ViewerContent = _panel;
+            context.Title = Path.IsPathRooted(path) ? Path.GetFileName(path) : path;
+
+            _panel.LoadHtml(GenerateMarkdownHtml(path), path);
+
+            context.IsBusy = false;
+        }
+
+        public void Dispose()
+        {
+            GC.SuppressFinalize(this);
+
+            _panel?.Dispose();
+        }
+
+        ~Plugin()
+        {
+            Dispose();
+        }
+
+        private string GenerateMarkdownHtml(string path)
+        {
+            var md = File.ReadAllText(path);
+            var html = Resources.md2html.Replace("{{content}}", md);
+
+            return html;
+        }
+    }
+}