Merge pull request #714 from redstrate/cmark

38 files changed, 104 insertions, 5987 deletions

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 77e934e1..5d4004d0 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -136,6 +136,7 @@ jobs:
             quazip-qt6:p
             ccache:p
             qt6-5compat:p
+            cmark:p
 
       - name: Force newer ccache
         if: runner.os == 'Windows' && matrix.msystem == '' && inputs.build_type == 'Debug'
diff --git a/.gitmodules b/.gitmodules
index 95274f15..87703fee 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -16,3 +16,6 @@
 [submodule "libraries/extra-cmake-modules"]
 	path = libraries/extra-cmake-modules
 	url = https://github.com/KDE/extra-cmake-modules
+[submodule "libraries/cmark"]
+	path = libraries/cmark
+	url = https://github.com/commonmark/cmark.git
diff --git a/CMakeLists.txt b/CMakeLists.txt
index c7ba9e9f..2194317b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -266,6 +266,9 @@ if(NOT Launcher_FORCE_BUNDLED_LIBS)
 
     # Find ghc_filesystem
     find_package(ghc_filesystem QUIET)
+
+    # Find cmark
+    find_package(cmark QUIET)
 endif()
 
 include(ECMQtDeclareLoggingCategory)
@@ -374,7 +377,6 @@ option(NBT_BUILD_TESTS "Build NBT library tests" OFF) #FIXME: fix unit tests.
 add_subdirectory(libraries/libnbtplusplus)
 
 add_subdirectory(libraries/systeminfo) # system information library
-add_subdirectory(libraries/hoedown) # markdown parser
 add_subdirectory(libraries/launcher) # java based launcher part for Minecraft
 add_subdirectory(libraries/javacheck) # java compatibility checker
 if(NOT ZLIB_FOUND)
@@ -408,6 +410,16 @@ if(NOT tomlplusplus_FOUND)
 else()
     message(STATUS "Using system tomlplusplus")
 endif()
+if(NOT cmark_FOUND)
+    message(STATUS "Using bundled cmark")
+    set(CMARK_STATIC ON CACHE BOOL "Build static libcmark library" FORCE)
+    set(CMARK_SHARED OFF CACHE BOOL "Build shared libcmark library" FORCE)
+    set(CMARK_TESTS OFF CACHE BOOL "Build cmark tests and enable testing" FORCE)
+    add_subdirectory(libraries/cmark EXCLUDE_FROM_ALL) # Markdown parser
+    add_library(cmark::cmark ALIAS cmark_static)
+else()
+    message(STATUS "Using system cmark")
+endif()
 add_subdirectory(libraries/katabasis) # An OAuth2 library that tried to do too much
 add_subdirectory(libraries/gamemode)
 add_subdirectory(libraries/murmur2) # Hash for usage with the CurseForge API
diff --git a/COPYING.md b/COPYING.md
index 75a5c0eb..79290654 100644
--- a/COPYING.md
+++ b/COPYING.md
@@ -156,23 +156,34 @@
     the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     Boston, MA 02110-1301, USA.
 
-## Hoedown
-
-    Copyright (c) 2008, Natacha Porté
-    Copyright (c) 2011, Vicent Martí
-    Copyright (c) 2014, Xavier Mendez, Devin Torres and the Hoedown authors
-
-    Permission to use, copy, modify, and distribute this software for any
-    purpose with or without fee is hereby granted, provided that the above
-    copyright notice and this permission notice appear in all copies.
-
-    THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-    WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-    MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-    ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
-    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+## cmark
+
+    Copyright (c) 2014, John MacFarlane
+
+    All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions are met:
+
+        * Redistributions of source code must retain the above copyright
+        notice, this list of conditions and the following disclaimer.
+
+        * Redistributions in binary form must reproduce the above
+        copyright notice, this list of conditions and the following
+        disclaimer in the documentation and/or other materials provided
+        with the distribution.
+
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+    A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+    OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+    SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+    LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+    OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 ## Batch icon set
 
diff --git a/flatpak/org.prismlauncher.PrismLauncher.yml b/flatpak/org.prismlauncher.PrismLauncher.yml
index fca306d7..071772c6 100644
--- a/flatpak/org.prismlauncher.PrismLauncher.yml
+++ b/flatpak/org.prismlauncher.PrismLauncher.yml
@@ -39,6 +39,7 @@ modules:
     sources:
         - type: dir
           path: ../
+    builddir: true
   - name: openjdk
     buildsystem: simple
     build-commands:
diff --git a/launcher/CMakeLists.txt b/launcher/CMakeLists.txt
index 74b7b212..eec6c787 100644
--- a/launcher/CMakeLists.txt
+++ b/launcher/CMakeLists.txt
@@ -631,7 +631,7 @@ SET(LAUNCHER_SOURCES
     DesktopServices.cpp
     VersionProxyModel.h
     VersionProxyModel.cpp
-    HoeDown.h
+    Markdown.h
 
     # Super secret!
     KonamiCode.h
@@ -1053,7 +1053,7 @@ target_link_libraries(Launcher_logic
 )
 target_link_libraries(Launcher_logic
     QuaZip::QuaZip
-    hoedown
+    cmark::cmark
     LocalPeer
     Launcher_rainbow
 )
diff --git a/launcher/HoeDown.h b/launcher/HoeDown.h
deleted file mode 100644
index cb62de6c..00000000
--- a/launcher/HoeDown.h
+++ /dev/null
@@ -1,76 +0,0 @@
-/* Copyright 2013-2021 MultiMC Contributors
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#pragma once
-#include <hoedown/html.h>
-#include <hoedown/document.h>
-#include <QString>
-#include <QByteArray>
-
-/**
- * hoedown wrapper, because dealing with resource lifetime in C is stupid
- */
-class HoeDown
-{
-public:
-    class buffer
-    {
-    public:
-        buffer(size_t unit = 4096)
-        {
-            buf = hoedown_buffer_new(unit);
-        }
-        ~buffer()
-        {
-            hoedown_buffer_free(buf);
-        }
-        const char * cstr()
-        {
-            return hoedown_buffer_cstr(buf);
-        }
-        void put(QByteArray input)
-        {
-            hoedown_buffer_put(buf, reinterpret_cast<uint8_t *>(input.data()), input.size());
-        }
-        const uint8_t * data() const
-        {
-            return buf->data;
-        }
-        size_t size() const
-        {
-            return buf->size;
-        }
-        hoedown_buffer * buf;
-    } ib, ob;
-    HoeDown()
-    {
-        renderer = hoedown_html_renderer_new((hoedown_html_flags) 0,0);
-        document = hoedown_document_new(renderer, (hoedown_extensions) 0, 8);
-    }
-    ~HoeDown()
-    {
-        hoedown_document_free(document);
-        hoedown_html_renderer_free(renderer);
-    }
-    QString process(QByteArray input)
-    {
-        ib.put(input);
-        hoedown_document_render(document, ob.buf, ib.data(), ib.size());
-        return ob.cstr();
-    }
-private:
-    hoedown_document * document;
-    hoedown_renderer * renderer;
-};
diff --git a/launcher/Markdown.h b/launcher/Markdown.h
new file mode 100644
index 00000000..f115dd57
--- /dev/null
+++ b/launcher/Markdown.h
@@ -0,0 +1,34 @@
+// SPDX-License-Identifier: GPL-3.0-only
+/*
+ *  Prism Launcher - Minecraft Launcher
+ *  Copyright (C) 2023 Joshua Goins <josh@redstrate.com>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, version 3.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <QString>
+#include <cmark.h>
+
+static QString markdownToHTML(const QString& markdown)
+{
+    const QByteArray markdownData = markdown.toUtf8();
+    char* buffer = cmark_markdown_to_html(markdownData.constData(), markdownData.length(), CMARK_OPT_NOBREAKS | CMARK_OPT_UNSAFE);
+
+    QString htmlStr(buffer);
+
+    free(buffer);
+
+    return htmlStr;
+}
\ No newline at end of file
diff --git a/launcher/modplatform/modrinth/ModrinthPackIndex.cpp b/launcher/modplatform/modrinth/ModrinthPackIndex.cpp
index ae45e096..aec45a73 100644
--- a/launcher/modplatform/modrinth/ModrinthPackIndex.cpp
+++ b/launcher/modplatform/modrinth/ModrinthPackIndex.cpp
@@ -87,7 +87,7 @@ void Modrinth::loadExtraPackData(ModPlatform::IndexedPack& pack, QJsonObject& ob
         pack.extraData.donate.append(donate);
     }
 
-    pack.extraData.body = Json::ensureString(obj, "body");
+    pack.extraData.body = Json::ensureString(obj, "body").remove("<br>");
 
     pack.extraDataLoaded = true;
 }
diff --git a/launcher/ui/dialogs/AboutDialog.cpp b/launcher/ui/dialogs/AboutDialog.cpp
index a36e4a3d..76e3d8ed 100644
--- a/launcher/ui/dialogs/AboutDialog.cpp
+++ b/launcher/ui/dialogs/AboutDialog.cpp
@@ -39,12 +39,11 @@
 #include <QIcon>
 #include "Application.h"
 #include "BuildConfig.h"
+#include "Markdown.h"
 
 #include <net/NetJob.h>
 #include <qobject.h>
 
-#include "HoeDown.h"
-
 namespace {
 QString getLink(QString link, QString name) {
     return QString("&lt;<a href='%1'>%2</a>&gt;").arg(link).arg(name);
@@ -114,10 +113,9 @@ QString getCreditsHtml()
 
 QString getLicenseHtml()
 {
-    HoeDown hoedown;
     QFile dataFile(":/documents/COPYING.md");
     dataFile.open(QIODevice::ReadOnly);
-    QString output = hoedown.process(dataFile.readAll());
+    QString output = markdownToHTML(dataFile.readAll());
     return output;
 }
 
diff --git a/launcher/ui/dialogs/ModUpdateDialog.cpp b/launcher/ui/dialogs/ModUpdateDialog.cpp
index cedd4a96..2704243e 100644
--- a/launcher/ui/dialogs/ModUpdateDialog.cpp
+++ b/launcher/ui/dialogs/ModUpdateDialog.cpp
@@ -7,6 +7,7 @@
 
 #include "FileSystem.h"
 #include "Json.h"
+#include "Markdown.h"
 
 #include "tasks/ConcurrentTask.h"
 
@@ -17,7 +18,6 @@
 #include "modplatform/flame/FlameCheckUpdate.h"
 #include "modplatform/modrinth/ModrinthCheckUpdate.h"
 
-#include <HoeDown.h>
 #include <QTextBrowser>
 #include <QTreeWidgetItem>
 
@@ -369,14 +369,7 @@ void ModUpdateDialog::appendMod(CheckUpdateTask::UpdatableMod const& info)
     QString text = info.changelog;
     switch (info.provider) {
         case ModPlatform::Provider::MODRINTH: {
-            HoeDown h;
-            // HoeDown bug?: \n aren't converted to <br>
-            text = h.process(info.changelog.toUtf8());
-
-            // Don't convert if there's an HTML tag right after (Qt rendering weirdness)
-            text.remove(QRegularExpression("(\n+)(?=<)"));
-            text.replace('\n', "<br>");
-
+            text = markdownToHTML(info.changelog.toUtf8());
             break;
         }
         default:
diff --git a/launcher/ui/dialogs/UpdateDialog.cpp b/launcher/ui/dialogs/UpdateDialog.cpp
index 9e82531a..349d768f 100644
--- a/launcher/ui/dialogs/UpdateDialog.cpp
+++ b/launcher/ui/dialogs/UpdateDialog.cpp
@@ -41,7 +41,7 @@
 #include <Json.h>
 
 #include "BuildConfig.h"
-#include "HoeDown.h"
+#include "Markdown.h"
 
 UpdateDialog::UpdateDialog(bool hasUpdate, QWidget *parent) : QDialog(parent), ui(new Ui::UpdateDialog)
 {
@@ -89,8 +89,7 @@ void UpdateDialog::loadChangelog()
 
 QString reprocessMarkdown(QByteArray markdown)
 {
-    HoeDown hoedown;
-    QString output = hoedown.process(markdown);
+    QString output = markdownToHTML(markdown);
 
     // HACK: easier than customizing hoedown
     output.replace(QRegularExpression("GH-([0-9]+)"), "<a href=\"https://github.com/PrismLauncher/PrismLauncher/issues/\\1\">GH-\\1</a>");
diff --git a/launcher/ui/pages/instance/ManagedPackPage.cpp b/launcher/ui/pages/instance/ManagedPackPage.cpp
index 4de80468..8d56d894 100644
--- a/launcher/ui/pages/instance/ManagedPackPage.cpp
+++ b/launcher/ui/pages/instance/ManagedPackPage.cpp
@@ -9,14 +9,13 @@
 #include <QProxyStyle>
 #include <QStyleFactory>
 
-#include <HoeDown.h>
-
 #include "Application.h"
 #include "BuildConfig.h"
 #include "InstanceImportTask.h"
 #include "InstanceList.h"
 #include "InstanceTask.h"
 #include "Json.h"
+#include "Markdown.h"
 
 #include "modplatform/modrinth/ModrinthPackManifest.h"
 
@@ -263,8 +262,7 @@ void ModrinthManagedPackPage::suggestVersion()
     auto index = ui->versionsComboBox->currentIndex();
     auto version = m_pack.versions.at(index);
 
-    HoeDown md_parser;
-    ui->changelogTextBrowser->setHtml(md_parser.process(version.changelog.toUtf8()));
+    ui->changelogTextBrowser->setHtml(markdownToHTML(version.changelog.toUtf8()));
 
     ManagedPackPage::suggestVersion();
 }
diff --git a/launcher/ui/pages/modplatform/ModPage.cpp b/launcher/ui/pages/modplatform/ModPage.cpp
index 75be25b2..0f30689e 100644
--- a/launcher/ui/pages/modplatform/ModPage.cpp
+++ b/launcher/ui/pages/modplatform/ModPage.cpp
@@ -43,13 +43,11 @@
 #include <QRegularExpression>
 #include <memory>
 
-#include <HoeDown.h>
-
 #include "minecraft/MinecraftInstance.h"
 #include "minecraft/PackProfile.h"
 #include "ui/dialogs/ModDownloadDialog.h"
 #include "ui/widgets/ProjectItem.h"
-
+#include "Markdown.h"
 
 ModPage::ModPage(ModDownloadDialog* dialog, BaseInstance* instance, ModAPI* api)
     : QWidget(dialog)
@@ -427,11 +425,6 @@ void ModPage::updateUi()
 
     text += "<hr>";
 
-    HoeDown h;
-
-    // hoedown bug: it doesn't handle markdown surrounded by block tags (like center, div) so strip them
-    current.extraData.body.remove(QRegularExpression("<[^>]*(?:center|div)\\W*>"));
-
-    ui->packDescription->setHtml(text + (current.extraData.body.isEmpty() ? current.description : h.process(current.extraData.body.toUtf8())));
+    ui->packDescription->setHtml(text + (current.extraData.body.isEmpty() ? current.description : markdownToHTML(current.extraData.body)));
     ui->packDescription->flush();
 }
diff --git a/launcher/ui/pages/modplatform/ftb/FtbPage.cpp b/launcher/ui/pages/modplatform/ftb/FtbPage.cpp
index b08f3bc4..7d59a6ae 100644
--- a/launcher/ui/pages/modplatform/ftb/FtbPage.cpp
+++ b/launcher/ui/pages/modplatform/ftb/FtbPage.cpp
@@ -43,7 +43,7 @@
 #include "ui/dialogs/NewInstanceDialog.h"
 #include "modplatform/modpacksch/FTBPackInstallTask.h"
 
-#include "HoeDown.h"
+#include "Markdown.h"
 
 FtbPage::FtbPage(NewInstanceDialog* dialog, QWidget *parent)
         : QWidget(parent), ui(new Ui::FtbPage), dialog(dialog)
@@ -175,8 +175,7 @@ void FtbPage::onSelectionChanged(QModelIndex first, QModelIndex second)
 
     selected = filterModel->data(first, Qt::UserRole).value<ModpacksCH::Modpack>();
 
-    HoeDown hoedown;
-    QString output = hoedown.process(selected.description.toUtf8());
+    QString output = markdownToHTML(selected.description.toUtf8());
     ui->packDescription->setHtml(output);
 
     // reverse foreach, so that the newest versions are first
diff --git a/launcher/ui/pages/modplatform/modrinth/ModrinthPage.cpp b/launcher/ui/pages/modplatform/modrinth/ModrinthPage.cpp
index 8ab2ad1d..0bb11d83 100644
--- a/launcher/ui/pages/modplatform/modrinth/ModrinthPage.cpp
+++ b/launcher/ui/pages/modplatform/modrinth/ModrinthPage.cpp
@@ -42,11 +42,10 @@
 #include "BuildConfig.h"
 #include "InstanceImportTask.h"
 #include "Json.h"
+#include "Markdown.h"
 
 #include "ui/widgets/ProjectItem.h"
 
-#include <HoeDown.h>
-
 #include <QComboBox>
 #include <QKeyEvent>
 #include <QPushButton>
@@ -280,8 +279,7 @@ void ModrinthPage::updateUI()
 
     text += "<hr>";
 
-    HoeDown h;
-    text += h.process(current.extra.body.toUtf8());
+    text += markdownToHTML(current.extra.body.toUtf8());
 
     ui->packDescription->setHtml(text + current.description);
     ui->packDescription->flush();
diff --git a/libraries/README.md b/libraries/README.md
index ac5a3618..95be8740 100644
--- a/libraries/README.md
+++ b/libraries/README.md
@@ -18,11 +18,13 @@ See [github repo](https://github.com/FeralInteractive/gamemode).
 
 BSD-3-Clause licensed
 
-## hoedown
+## cmark
 
-Hoedown is a revived fork of Sundown, the Markdown parser based on the original code of the Upskirt library by Natacha Porté.
+The C reference implementation of CommonMark, a standardized Markdown spec.
 
-See [github repo](https://github.com/hoedown/hoedown).
+See [github_repo](https://github.com/commonmark/cmark).
+
+BSD2 licensed.
 
 ## javacheck
 
diff --git a/libraries/cmark b/libraries/cmark
new file mode 160000
+Subproject a8da5a2f252b96eca60ae8bada1a9ba059a3840
diff --git a/libraries/hoedown/CMakeLists.txt b/libraries/hoedown/CMakeLists.txt
deleted file mode 100644
index 7902e734..00000000
--- a/libraries/hoedown/CMakeLists.txt
+++ /dev/null
@@ -1,26 +0,0 @@
-# hoedown 3.0.2 - https://github.com/hoedown/hoedown/archive/3.0.2.tar.gz
-project(hoedown LANGUAGES C VERSION 3.0.2)
-
-set(HOEDOWN_SOURCES
-include/hoedown/autolink.h
-include/hoedown/buffer.h
-include/hoedown/document.h
-include/hoedown/escape.h
-include/hoedown/html.h
-include/hoedown/stack.h
-include/hoedown/version.h
-src/autolink.c
-src/buffer.c
-src/document.c
-src/escape.c
-src/html.c
-src/html_blocks.c
-src/html_smartypants.c
-src/stack.c
-src/version.c
-)
-
-# Include self.
-add_library(hoedown STATIC ${HOEDOWN_SOURCES})
-
-target_include_directories(hoedown PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/include)
diff --git a/libraries/hoedown/LICENSE b/libraries/hoedown/LICENSE
deleted file mode 100644
index 4e75de4d..00000000
--- a/libraries/hoedown/LICENSE
+++ /dev/null
@@ -1,15 +0,0 @@
-Copyright (c) 2008, Natacha Porté
-Copyright (c) 2011, Vicent Martí
-Copyright (c) 2014, Xavier Mendez, Devin Torres and the Hoedown authors
-
-Permission to use, copy, modify, and distribute this software for any
-purpose with or without fee is hereby granted, provided that the above
-copyright notice and this permission notice appear in all copies.
-
-THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
-OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
diff --git a/libraries/hoedown/README.md b/libraries/hoedown/README.md
deleted file mode 100644
index abe2b6ca..00000000
--- a/libraries/hoedown/README.md
+++ /dev/null
@@ -1,9 +0,0 @@
-Hoedown
-=======
-
-This is Hoedown 3.0.2, taken from [the hoedown github repo](https://github.com/hoedown/hoedown).
-
-`Hoedown` is a revived fork of [Sundown](https://github.com/vmg/sundown),
-the Markdown parser based on the original code of the
-[Upskirt library](http://fossil.instinctive.eu/libupskirt/index)
-by Natacha Porté.
diff --git a/libraries/hoedown/include/hoedown/autolink.h b/libraries/hoedown/include/hoedown/autolink.h
deleted file mode 100644
index 953e7807..00000000
--- a/libraries/hoedown/include/hoedown/autolink.h
+++ /dev/null
@@ -1,46 +0,0 @@
-/* autolink.h - versatile autolinker */
-
-#ifndef HOEDOWN_AUTOLINK_H
-#define HOEDOWN_AUTOLINK_H
-
-#include "buffer.h"
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-
-/*************
- * CONSTANTS *
- *************/
-
-typedef enum hoedown_autolink_flags {
-    HOEDOWN_AUTOLINK_SHORT_DOMAINS = (1 << 0)
-} hoedown_autolink_flags;
-
-
-/*************
- * FUNCTIONS *
- *************/
-
-/* hoedown_autolink_is_safe: verify that a URL has a safe protocol */
-int hoedown_autolink_is_safe(const uint8_t *data, size_t size);
-
-/* hoedown_autolink__www: search for the next www link in data */
-size_t hoedown_autolink__www(size_t *rewind_p, hoedown_buffer *link,
-    uint8_t *data, size_t offset, size_t size, hoedown_autolink_flags flags);
-
-/* hoedown_autolink__email: search for the next email in data */
-size_t hoedown_autolink__email(size_t *rewind_p, hoedown_buffer *link,
-    uint8_t *data, size_t offset, size_t size, hoedown_autolink_flags flags);
-
-/* hoedown_autolink__url: search for the next URL in data */
-size_t hoedown_autolink__url(size_t *rewind_p, hoedown_buffer *link,
-    uint8_t *data, size_t offset, size_t size, hoedown_autolink_flags flags);
-
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /** HOEDOWN_AUTOLINK_H **/
diff --git a/libraries/hoedown/include/hoedown/buffer.h b/libraries/hoedown/include/hoedown/buffer.h
deleted file mode 100644
index 062d86ce..00000000
--- a/libraries/hoedown/include/hoedown/buffer.h
+++ /dev/null
@@ -1,134 +0,0 @@
-/* buffer.h - simple, fast buffers */
-
-#ifndef HOEDOWN_BUFFER_H
-#define HOEDOWN_BUFFER_H
-
-#include <stdio.h>
-#include <stddef.h>
-#include <stdarg.h>
-#include <stdint.h>
-#include <stdlib.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#if defined(_MSC_VER)
-#define __attribute__(x)
-#define inline __inline
-#define __builtin_expect(x,n) x
-#endif
-
-
-/*********
- * TYPES *
- *********/
-
-typedef void *(*hoedown_realloc_callback)(void *, size_t);
-typedef void (*hoedown_free_callback)(void *);
-
-struct hoedown_buffer {
-    uint8_t *data;    /* actual character data */
-    size_t size;    /* size of the string */
-    size_t asize;    /* allocated size (0 = volatile buffer) */
-    size_t unit;    /* reallocation unit size (0 = read-only buffer) */
-
-    hoedown_realloc_callback data_realloc;
-    hoedown_free_callback data_free;
-    hoedown_free_callback buffer_free;
-};
-
-typedef struct hoedown_buffer hoedown_buffer;
-
-
-/*************
- * FUNCTIONS *
- *************/
-
-/* allocation wrappers */
-void *hoedown_malloc(size_t size) __attribute__ ((malloc));
-void *hoedown_calloc(size_t nmemb, size_t size) __attribute__ ((malloc));
-void *hoedown_realloc(void *ptr, size_t size) __attribute__ ((malloc));
-
-/* hoedown_buffer_init: initialize a buffer with custom allocators */
-void hoedown_buffer_init(
-    hoedown_buffer *buffer,
-    size_t unit,
-    hoedown_realloc_callback data_realloc,
-    hoedown_free_callback data_free,
-    hoedown_free_callback buffer_free
-);
-
-/* hoedow