From f1708b3832d03fc4f4d985f93c89329b5efa78a5 Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Sun, 10 May 2020 20:51:35 +0200
Subject: [PATCH] LibWeb: Teach HtmlView how to render Markdown files :^)

---
 Applications/Browser/Makefile   |  2 +-
 Applications/IRCClient/Makefile |  2 +-
 Libraries/LibWeb/HtmlView.cpp   | 12 ++++++++++++
 3 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/Applications/Browser/Makefile b/Applications/Browser/Makefile
index 1cd944c891..6f53cb01d9 100644
--- a/Applications/Browser/Makefile
+++ b/Applications/Browser/Makefile
@@ -8,7 +8,7 @@ OBJS = \
 
 PROGRAM = Browser
 
-LIB_DEPS = Web JS TextCodec GUI Gfx IPC Protocol Core
+LIB_DEPS = Web JS Markdown TextCodec GUI Gfx IPC Protocol Core
 
 main.cpp: ../../Libraries/LibWeb/CSS/PropertyID.h
 ../../Libraries/LibWeb/CSS/PropertyID.h:
diff --git a/Applications/IRCClient/Makefile b/Applications/IRCClient/Makefile
index 693d63ac6f..85cacc569b 100644
--- a/Applications/IRCClient/Makefile
+++ b/Applications/IRCClient/Makefile
@@ -11,6 +11,6 @@ OBJS = \
 
 PROGRAM = IRCClient
 
-LIB_DEPS = Web TextCodec JS GUI Gfx Protocol IPC Thread Pthread Core
+LIB_DEPS = Web TextCodec JS Markdown GUI Gfx Protocol IPC Thread Pthread Core
 
 include ../../Makefile.common
diff --git a/Libraries/LibWeb/HtmlView.cpp b/Libraries/LibWeb/HtmlView.cpp
index 5ed2bb7504..8c0fb19eae 100644
--- a/Libraries/LibWeb/HtmlView.cpp
+++ b/Libraries/LibWeb/HtmlView.cpp
@@ -33,6 +33,7 @@
 #include <LibGUI/Window.h>
 #include <LibGfx/ImageDecoder.h>
 #include <LibJS/Runtime/Value.h>
+#include <LibMarkdown/Document.h>
 #include <LibWeb/DOM/Element.h>
 #include <LibWeb/DOM/ElementFactory.h>
 #include <LibWeb/DOM/HTMLAnchorElement.h>
@@ -321,6 +322,15 @@ void HtmlView::reload()
     load(main_frame().document()->url());
 }
 
+static RefPtr<Document> create_markdown_document(const ByteBuffer& data, const URL& url)
+{
+    Markdown::Document markdown_document;
+    if (!markdown_document.parse(data))
+        return nullptr;
+
+    return parse_html_document(markdown_document.render_to_html(), url);
+}
+
 static RefPtr<Document> create_text_document(const ByteBuffer& data, const URL& url)
 {
     auto document = adopt(*new Document(url));
@@ -420,6 +430,8 @@ void HtmlView::load(const URL& url)
                 document = create_image_document(data, url);
             } else if (url.path().ends_with(".txt")) {
                 document = create_text_document(data, url);
+            } else if (url.path().ends_with(".md")) {
+                document = create_markdown_document(data, url);
             } else {
                 String encoding = "utf-8";