Updated markdown export implementation

- Removed ZIP system for now, until the idea can be fleshed out. - Added testing to cover. - Upgraded used library. - Added custom handling for BookStack callouts. - Added HTML cleanup to better produce output for things like code blocks.
2021-06-22 21:02:18 +01:00 · 2021-06-22 21:02:18 +01:00 · 57ea2e92ec
parent 9af636bd48
commit 57ea2e92ec
10 changed files with 344 additions and 112 deletions
--- a/app/Entities/Models/Chapter.php
+++ b/app/Entities/Models/Chapter.php
@ -5,6 +5,7 @@ use Illuminate\Support\Collection;
 /**
 * Class Chapter
 * @property Collection<Page> $pages
+ * @property mixed description
 */
 class Chapter extends BookChild
 {
--- a/app/Entities/Tools/ExportFormatter.php
+++ b/app/Entities/Tools/ExportFormatter.php
@ -3,13 +3,12 @@
 use BookStack\Entities\Models\Book;
 use BookStack\Entities\Models\Chapter;
 use BookStack\Entities\Models\Page;
+use BookStack\Entities\Tools\Markdown\HtmlToMarkdown;
 use BookStack\Uploads\ImageService;
 use DomPDF;
 use Exception;
 use SnappyPDF;
-use League\HTMLToMarkdown\HtmlConverter;
 use Throwable;
-use ZipArchive;

 class ExportFormatter
 {
@ -231,23 +230,20 @@ class ExportFormatter

    /**
     * Convert a page to a Markdown file.
-     * @throws Throwable
     */
-    public function pageToMarkdown(Page $page)
+    public function pageToMarkdown(Page $page): string
    {
-        if (property_exists($page, 'markdown') && $page->markdown != '') {
+        if ($page->markdown) {
            return "# " . $page->name . "\n\n" . $page->markdown;
-        } else {
-            $converter = new HtmlConverter();
-            return "# " . $page->name . "\n\n" . $converter->convert($page->html);
        }
+
+        return "# " . $page->name . "\n\n" . (new HtmlToMarkdown($page->html))->convert();
    }

    /**
     * Convert a chapter to a Markdown file.
-     * @throws Throwable
     */
-    public function chapterToMarkdown(Chapter $chapter)
+    public function chapterToMarkdown(Chapter $chapter): string
    {
        $text = "# " . $chapter->name . "\n\n";
        $text .= $chapter->description . "\n\n";
@ -265,7 +261,7 @@ class ExportFormatter
        $bookTree = (new BookContents($book))->getTree(false, true);
        $text = "# " . $book->name . "\n\n";
        foreach ($bookTree as $bookChild) {
-            if ($bookChild->isA('chapter')) {
+            if ($bookChild instanceof Chapter) {
                $text .= $this->chapterToMarkdown($bookChild);
            } else {
                $text .= $this->pageToMarkdown($bookChild);
@ -273,27 +269,4 @@ class ExportFormatter
        }
        return $text;
    }
-
-    /**
-     * Convert a book into a zip file.
-     */
-    public function bookToZip(Book $book): string
-    {
-        // TODO: Is not unlinking the file a security risk?
-        $z = new ZipArchive();
-        $z->open("book.zip", \ZipArchive::CREATE | \ZipArchive::OVERWRITE);
-        $bookTree = (new BookContents($book))->getTree(false, true);
-        foreach ($bookTree as $bookChild) {
-            if ($bookChild->isA('chapter')) {
-                $z->addEmptyDir($bookChild->name);
-                foreach ($bookChild->pages as $page) {
-                    $filename = $bookChild->name . "/" . $page->name . ".md";
-                    $z->addFromString($filename, $this->pageToMarkdown($page));
-                }
-            } else {
-                $z->addFromString($bookChild->name . ".md", $this->pageToMarkdown($bookChild));
-            }
-        }
-        return "book.zip";
-    }
 }
--- a/app/Entities/Tools/Markdown/CustomParagraphConverter.php
+++ b/app/Entities/Tools/Markdown/CustomParagraphConverter.php
@ -0,0 +1,17 @@
+<?php namespace BookStack\Entities\Tools\Markdown;
+
+use League\HTMLToMarkdown\Converter\ParagraphConverter;
+use League\HTMLToMarkdown\ElementInterface;
+
+class CustomParagraphConverter extends ParagraphConverter
+{
+    public function convert(ElementInterface $element): string
+    {
+        $class = $element->getAttribute('class');
+        if (strpos($class, 'callout') !== false) {
+            return "<{$element->getTagName()} class=\"{$class}\">{$element->getValue()}</{$element->getTagName()}>\n\n";
+        }
+
+        return parent::convert($element);
+    }
+}
--- a/app/Entities/Tools/Markdown/HtmlToMarkdown.php
+++ b/app/Entities/Tools/Markdown/HtmlToMarkdown.php
@ -0,0 +1,76 @@
+<?php namespace BookStack\Entities\Tools\Markdown;
+
+use League\HTMLToMarkdown\Converter\BlockquoteConverter;
+use League\HTMLToMarkdown\Converter\CodeConverter;
+use League\HTMLToMarkdown\Converter\CommentConverter;
+use League\HTMLToMarkdown\Converter\DivConverter;
+use League\HTMLToMarkdown\Converter\EmphasisConverter;
+use League\HTMLToMarkdown\Converter\HardBreakConverter;
+use League\HTMLToMarkdown\Converter\HeaderConverter;
+use League\HTMLToMarkdown\Converter\HorizontalRuleConverter;
+use League\HTMLToMarkdown\Converter\ImageConverter;
+use League\HTMLToMarkdown\Converter\LinkConverter;
+use League\HTMLToMarkdown\Converter\ListBlockConverter;
+use League\HTMLToMarkdown\Converter\ListItemConverter;
+use League\HTMLToMarkdown\Converter\PreformattedConverter;
+use League\HTMLToMarkdown\Converter\TextConverter;
+use League\HTMLToMarkdown\Environment;
+use League\HTMLToMarkdown\HtmlConverter;
+
+class HtmlToMarkdown
+{
+    protected $html;
+
+    public function __construct(string $html)
+    {
+        $this->html = $html;
+    }
+
+    /**
+     * Run the conversion
+     */
+    public function convert(): string
+    {
+        $converter = new HtmlConverter($this->getConverterEnvironment());
+        $html = $this->prepareHtml($this->html);
+        return $converter->convert($html);
+    }
+
+    /**
+     * Run any pre-processing to the HTML to clean it up manually before conversion.
+     */
+    protected function prepareHtml(string $html): string
+    {
+        // Carriage returns can cause whitespace issues in output
+        $html = str_replace("\r\n", "\n", $html);
+        // Attributes on the pre tag can cause issues with conversion
+        return preg_replace('/<pre .*?>/', '<pre>', $html);
+    }
+
+    /**
+     * Get the HTML to Markdown customized environment.
+     * Extends the default provided environment with some BookStack specific tweaks.
+     */
+    protected function getConverterEnvironment(): Environment
+    {
+        $environment = new Environment(['header_style' => 'atx']);
+
+        $environment->addConverter(new BlockquoteConverter());
+        $environment->addConverter(new CodeConverter());
+        $environment->addConverter(new CommentConverter());
+        $environment->addConverter(new DivConverter());
+        $environment->addConverter(new EmphasisConverter());
+        $environment->addConverter(new HardBreakConverter());
+        $environment->addConverter(new HeaderConverter());
+        $environment->addConverter(new HorizontalRuleConverter());
+        $environment->addConverter(new ImageConverter());
+        $environment->addConverter(new LinkConverter());
+        $environment->addConverter(new ListBlockConverter());
+        $environment->addConverter(new ListItemConverter());
+        $environment->addConverter(new CustomParagraphConverter());
+        $environment->addConverter(new PreformattedConverter());
+        $environment->addConverter(new TextConverter());
+
+        return $environment;
+    }
+}
--- a/app/Http/Controllers/BookExportController.php
+++ b/app/Http/Controllers/BookExportController.php
@ -59,17 +59,7 @@ class BookExportController extends Controller
    public function markdown(string $bookSlug)
    {
        $book = $this->bookRepo->getBySlug($bookSlug);
-        $textContent = $this->exportService->bookToMarkdown($book);
+        $textContent = $this->exportFormatter->bookToMarkdown($book);
        return $this->downloadResponse($textContent, $bookSlug . '.md');
    }
-
-    /**
-     * Export a book as a zip file, made of markdown files.
-     */
-    public function zip(string $bookSlug)
-    {
-        $book = $this->bookRepo->getBySlug($bookSlug);
-        $filename = $this->exportService->bookToZip($book);
-        return response()->download($filename);
-    }
 }
--- a/app/Http/Controllers/ChapterExportController.php
+++ b/app/Http/Controllers/ChapterExportController.php
@ -63,7 +63,7 @@ class ChapterExportController extends Controller
    {
        // TODO: This should probably export to a zip file.
        $chapter = $this->chapterRepo->getBySlug($bookSlug, $chapterSlug);
-        $chapterText = $this->exportService->chapterToMarkdown($chapter);
+        $chapterText = $this->exportFormatter->chapterToMarkdown($chapter);
        return $this->downloadResponse($chapterText, $chapterSlug . '.md');
    }
 }
--- a/app/Http/Controllers/PageExportController.php
+++ b/app/Http/Controllers/PageExportController.php
@ -68,7 +68,7 @@ class PageExportController extends Controller
    public function markdown(string $bookSlug, string $pageSlug)
    {
        $page = $this->pageRepo->getBySlug($bookSlug, $pageSlug);
-        $pageText = $this->exportService->pageToMarkdown($page);
+        $pageText = $this->exportFormatter->pageToMarkdown($page);
        return $this->downloadResponse($pageText, $pageSlug . '.md');
    }
 }
--- a/composer.json
+++ b/composer.json
@ -23,7 +23,7 @@
        "laravel/socialite": "^5.1",
        "league/commonmark": "^1.5",
        "league/flysystem-aws-s3-v3": "^1.0.29",
-        "league/html-to-markdown": "^4.9",
+        "league/html-to-markdown": "^5.0.0",
        "nunomaduro/collision": "^3.1",
        "onelogin/php-saml": "^4.0",
        "predis/predis": "^1.1.6",
--- a/composer.lock
+++ b/composer.lock
@ -4,20 +4,20 @@
        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
        "This file is @generated automatically"
    ],
-    "content-hash": "eb3108f1a3a757df9b9a3a4f82b5db3b",
+    "content-hash": "70a290f0e2112361af4a0abe15148adc",
    "packages": [
        {
            "name": "aws/aws-sdk-php",
-            "version": "3.184.2",
+            "version": "3.184.7",
            "source": {
                "type": "git",
                "url": "https://github.com/aws/aws-sdk-php.git",
-                "reference": "78fe691ab466fecf195209672f6c00c5d4ed219a"
+                "reference": "d5d5fe5fdfca6c7a56f2f8364d09c3100d5c2149"
            },
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-                "reference": "78fe691ab466fecf195209672f6c00c5d4ed219a",
+                "url": "https://api.github.com/repos/aws/aws-sdk-php/zipball/d5d5fe5fdfca6c7a56f2f8364d09c3100d5c2149",
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            "require": {
@ -92,9 +92,9 @@
            "support": {
                "forum": "https://forums.aws.amazon.com/forum.jspa?forumID=80",
                "issues": "https://github.com/aws/aws-sdk-php/issues",
-                "source": "https://github.com/aws/aws-sdk-php/tree/3.184.2"
+                "source": "https://github.com/aws/aws-sdk-php/tree/3.184.7"
            },
-            "time": "2021-06-11T18:20:15+00:00"
+            "time": "2021-06-21T18:37:16+00:00"
        },
        {
            "name": "barryvdh/laravel-dompdf",
@ -229,16 +229,16 @@
        },
        {
            "name": "doctrine/cache",
-            "version": "1.11.3",
+            "version": "2.0.3",
            "source": {
                "type": "git",
                "url": "https://github.com/doctrine/cache.git",
-                "reference": "3bb5588cec00a0268829cc4a518490df6741af9d"
+                "reference": "c9622c6820d3ede1e2315a6a377ea1076e421d88"
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-                "url": "https://api.github.com/repos/doctrine/cache/zipball/3bb5588cec00a0268829cc4a518490df6741af9d",
-                "reference": "3bb5588cec00a0268829cc4a518490df6741af9d",
+                "url": "https://api.github.com/repos/doctrine/cache/zipball/c9622c6820d3ede1e2315a6a377ea1076e421d88",
+                "reference": "c9622c6820d3ede1e2315a6a377ea1076e421d88",
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@ -308,7 +308,7 @@
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            "support": {
                "issues": "https://github.com/doctrine/cache/issues",
-                "source": "https://github.com/doctrine/cache/tree/1.11.3"
+                "source": "https://github.com/doctrine/cache/tree/2.0.3"
            },
            "funding": [
                {
@ -324,35 +324,36 @@
                    "type": "tidelift"
                }
            ],
-            "time": "2021-05-25T09:01:55+00:00"
+            "time": "2021-05-25T09:43:04+00:00"
        },
        {
            "name": "doctrine/dbal",
-            "version": "2.13.1",
+            "version": "2.13.2",
            "source": {
                "type": "git",
                "url": "https://github.com/doctrine/dbal.git",
-                "reference": "c800380457948e65bbd30ba92cc17cda108bf8c9"
+                "reference": "8dd39d2ead4409ce652fd4f02621060f009ea5e4"
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            "require": {
-                "doctrine/cache": "^1.0",
+                "doctrine/cache": "^1.0|^2.0",
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                "doctrine/event-manager": "^1.0",
                "ext-pdo": "*",
                "php": "^7.1 || ^8"
            },
            "require-dev": {
-                "doctrine/coding-standard": "8.2.0",
+                "doctrine/coding-standard": "9.0.0",
                "jetbrains/phpstorm-stubs": "2020.2",
                "phpstan/phpstan": "0.12.81",
-                "phpunit/phpunit": "^7.5.20|^8.5|9.5.0",
+                "phpunit/phpunit": "^7.5.20|^8.5|9.5.5",
                "squizlabs/php_codesniffer": "3.6.0",
+                "symfony/cache": "^4.4",
                "symfony/console": "^2.0.5|^3.0|^4.0|^5.0",
                "vimeo/psalm": "4.6.4"
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@ -415,7 +416,7 @@
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                "issues": "https://github.com/doctrine/dbal/issues",
-                "source": "https://github.com/doctrine/dbal/tree/2.13.1"
+                "source": "https://github.com/doctrine/dbal/tree/2.13.2"
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@ -431,7 +432,7 @@
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-            "time": "2021-04-17T17:30:19+00:00"
+            "time": "2021-06-18T21:48:39+00:00"
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@ -1651,16 +1652,16 @@
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-            "version": "v6.20.27",
+            "version": "v6.20.29",
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-                "reference": "92c0417e60efc39bc556ba5dfc9b20a56f7848fb"
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@ -1800,7 +1801,7 @@
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                "source": "https://github.com/laravel/framework"
            },
-            "time": "2021-05-11T14:00:28+00:00"
+            "time": "2021-06-22T13:41:06+00:00"
        },
        {
            "name": "laravel/socialite",
@ -1873,16 +1874,16 @@
        },
        {
            "name": "league/commonmark",
-            "version": "1.6.2",
+            "version": "1.6.4",
            "source": {
                "type": "git",
                "url": "https://github.com/thephpleague/commonmark.git",
-                "reference": "7d70d2f19c84bcc16275ea47edabee24747352eb"
+                "reference": "c3c8b7217c52572fb42aaf84211abccf75a151b2"
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-                "reference": "7d70d2f19c84bcc16275ea47edabee24747352eb",
+                "url": "https://api.github.com/repos/thephpleague/commonmark/zipball/c3c8b7217c52572fb42aaf84211abccf75a151b2",
+                "reference": "c3c8b7217c52572fb42aaf84211abccf75a151b2",
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            "require": {
@ -1900,7 +1901,7 @@
                "github/gfm": "0.29.0",
                "michelf/php-markdown": "~1.4",
                "mikehaertl/php-shellcommand": "^1.4",
-                "phpstan/phpstan": "^0.12",
+                "phpstan/phpstan": "^0.12.90",
                "phpunit/phpunit": "^7.5 || ^8.5 || ^9.2",
                "scrutinizer/ocular": "^1.5",
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@ -1970,7 +1971,7 @@
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-            "time": "2021-05-12T11:39:41+00:00"
+            "time": "2021-06-19T20:08:14+00:00"
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        {
            "name": "league/flysystem",
@ -2118,6 +2119,95 @@
            },
            "time": "2020-10-08T18:58:37+00:00"
        },
+        {
+            "name": "league/html-to-markdown",
+            "version": "5.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/thephpleague/html-to-markdown.git",
+                "reference": "c4dbebbebe0fe454b6b38e6c683a977615bd7dc2"
+            },
+            "dist": {
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+                "url": "https://api.github.com/repos/thephpleague/html-to-markdown/zipball/c4dbebbebe0fe454b6b38e6c683a977615bd7dc2",
+                "reference": "c4dbebbebe0fe454b6b38e6c683a977615bd7dc2",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-xml": "*",
+                "php": "^7.2.5 || ^8.0"
+            },
+            "require-dev": {
+                "mikehaertl/php-shellcommand": "^1.1.0",
+                "phpstan/phpstan": "^0.12.82",
+                "phpunit/phpunit": "^8.5 || ^9.2",
+                "scrutinizer/ocular": "^1.6",
+                "unleashedtech/php-coding-standard": "^2.7",
+                "vimeo/psalm": "^4.6"
+            },
+            "bin": [
+                "bin/html-to-markdown"
+            ],
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "5.1-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "League\\HTMLToMarkdown\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Colin O'Dell",
+                    "email": "colinodell@gmail.com",
+                    "homepage": "https://www.colinodell.com",
+                    "role": "Lead Developer"
+                },
+                {
+                    "name": "Nick Cernis",
+                    "email": "nick@cern.is",
+                    "homepage": "http://modernnerd.net",
+                    "role": "Original Author"
+                }
+            ],
+            "description": "An HTML-to-markdown conversion helper for PHP",
+            "homepage": "https://github.com/thephpleague/html-to-markdown",
+            "keywords": [
+                "html",
+                "markdown"
+            ],
+            "support": {
+                "issues": "https://github.com/thephpleague/html-to-markdown/issues",
+                "source": "https://github.com/thephpleague/html-to-markdown/tree/5.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://www.colinodell.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://www.paypal.me/colinpodell/10.00",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/colinodell",
+                    "type": "github"
+                },
+                {
+                    "url": "https://www.patreon.com/colinodell",
+                    "type": "patreon"
+                }
+            ],
+            "time": "2021-03-29T01:29:08+00:00"
+        },
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            "name": "league/mime-type-detection",
            "version": "1.7.0",
@ -2347,16 +2437,16 @@
        },
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-            "version": "2.6.0",
+            "version": "2.6.1",
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                "url": "https://github.com/jmespath/jmespath.php.git",
-                "reference": "42dae2cbd13154083ca6d70099692fef8ca84bfb"
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-                "reference": "42dae2cbd13154083ca6d70099692fef8ca84bfb",
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@ -2364,7 +2454,7 @@
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-                "composer/xdebug-handler": "^1.4",
+                "composer/xdebug-handler": "^1.4 || ^2.0",
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            },
            "bin": [
@ -2402,9 +2492,9 @@
            ],
            "support": {
                "issues": "https://github.com/jmespath/jmespath.php/issues",
-                "source": "https://github.com/jmespath/jmespath.php/tree/2.6.0"
+                "source": "https://github.com/jmespath/jmespath.php/tree/2.6.1"
            },
-            "time": "2020-07-31T21:01:56+00:00"
+            "time": "2021-06-14T00:11:39+00:00"
        },
        {
            "name": "nesbot/carbon",
@ -3781,16 +3871,16 @@
        },
        {
            "name": "socialiteproviders/microsoft-azure",
-            "version": "4.2.0",
+            "version": "4.2.1",
            "source": {
                "type": "git",
                "url": "https://github.com/SocialiteProviders/Microsoft-Azure.git",
-                "reference": "7808764f777a01df88be9ca6b14d683e50aaf88a"
+                "reference": "64779ec21db0bee3111039a67c0fa0ab550a3462"
            },
            "dist": {
                "type": "zip",
-                "url": "https://api.github.com/repos/SocialiteProviders/Microsoft-Azure/zipball/7808764f777a01df88be9ca6b14d683e50aaf88a",
-                "reference": "7808764f777a01df88be9ca6b14d683e50aaf88a",
+                "url": "https://api.github.com/repos/SocialiteProviders/Microsoft-Azure/zipball/64779ec21db0bee3111039a67c0fa0ab550a3462",
+                "reference": "64779ec21db0bee3111039a67c0fa0ab550a3462",
                "shasum": ""
            },
            "require": {
@ -3816,9 +3906,9 @@
            ],
            "description": "Microsoft Azure OAuth2 Provider for Laravel Socialite",
            "support": {
-                "source": "https://github.com/SocialiteProviders/Microsoft-Azure/tree/4.2.0"
+                "source": "https://github.com/SocialiteProviders/Microsoft-Azure/tree/4.2.1"
            },
-            "time": "2020-12-01T23:10:59+00:00"
+            "time": "2021-06-14T22:51:38+00:00"
        },
        {
            "name": "socialiteproviders/okta",
@ -4904,16 +4994,16 @@
        },
        {
            "name": "symfony/mime",
-            "version": "v5.3.0",
+            "version": "v5.3.2",
            "source": {
                "type": "git",
                "url": "https://github.com/symfony/mime.git",
-                "reference": "ed710d297b181f6a7194d8172c9c2423d58e4852"
+                "reference": "47dd7912152b82d0d4c8d9040dbc93d6232d472a"
            },
            "dist": {
                "type": "zip",
-                "url": "https://api.github.com/repos/symfony/mime/zipball/ed710d297b181f6a7194d8172c9c2423d58e4852",
-                "reference": "ed710d297b181f6a7194d8172c9c2423d58e4852",
+                "url": "https://api.github.com/repos/symfony/mime/zipball/47dd7912152b82d0d4c8d9040dbc93d6232d472a",
+                "reference": "47dd7912152b82d0d4c8d9040dbc93d6232d472a",
                "shasum": ""
            },
            "require": {
@ -4967,7 +5057,7 @@
                "mime-type"
            ],
            "support": {
-                "source": "https://github.com/symfony/mime/tree/v5.3.0"
+                "source": "https://github.com/symfony/mime/tree/v5.3.2"
            },
            "funding": [
                {
@ -4983,7 +5073,7 @@
                    "type": "tidelift"
                }
            ],
-            "time": "2021-05-26T17:43:10+00:00"
+            "time": "2021-06-09T10:58:01+00:00"
        },
        {
            "name": "symfony/polyfill-ctype",
@ -6250,16 +6340,16 @@
    "packages-dev": [
        {
            "name": "barryvdh/laravel-debugbar",
-            "version": "v3.6.1",
+            "version": "v3.6.2",
            "source": {
                "type": "git",
                "url": "https://github.com/barryvdh/laravel-debugbar.git",
-                "reference": "f6f0f895a33cac801286a74355d146bb5384a5da"
+                "reference": "70b89754913fd89fef16d0170a91dbc2a5cd633a"
            },
            "dist": {
                "type": "zip",
-                "url": "https://api.github.com/repos/barryvdh/laravel-debugbar/zipball/f6f0f895a33cac801286a74355d146bb5384a5da",
-                "reference": "f6f0f895a33cac801286a74355d146bb5384a5da",
+                "url": "https://api.github.com/repos/barryvdh/laravel-debugbar/zipball/70b89754913fd89fef16d0170a91dbc2a5cd633a",
+                "reference": "70b89754913fd89fef16d0170a91dbc2a5cd633a",
                "shasum": ""
            },
            "require": {
@ -6319,15 +6409,19 @@
            ],
            "support": {
                "issues": "https://github.com/barryvdh/laravel-debugbar/issues",
-                "source": "https://github.com/barryvdh/laravel-debugbar/tree/v3.6.1"
+                "source": "https://github.com/barryvdh/laravel-debugbar/tree/v3.6.2"
            },
            "funding": [
+                {
+                    "url": "https://fruitcake.nl",
+                    "type": "custom"
+                },
                {
                    "url": "https://github.com/barryvdh",
                    "type": "github"
                }
            ],
-            "time": "2021-06-02T06:42:22+00:00"
+            "time": "2021-06-14T14:29:26+00:00"
        },
        {
            "name": "barryvdh/laravel-ide-helper",
@ -9169,16 +9263,16 @@
        },
        {
            "name": "sebastian/type",
-            "version": "2.3.2",
+            "version": "2.3.4",
            "source": {
                "type": "git",
                "url": "https://github.com/sebastianbergmann/type.git",
-                "reference": "0d1c587401514d17e8f9258a27e23527cb1b06c1"
+                "reference": "b8cd8a1c753c90bc1a0f5372170e3e489136f914"
            },
            "dist": {
                "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/type/zipball/0d1c587401514d17e8f9258a27e23527cb1b06c1",
-                "reference": "0d1c587401514d17e8f9258a27e23527cb1b06c1",
+                "url": "https://api.github.com/repos/sebastianbergmann/type/zipball/b8cd8a1c753c90bc1a0f5372170e3e489136f914",
+                "reference": "b8cd8a1c753c90bc1a0f5372170e3e489136f914",
                "shasum": ""
            },
            "require": {
@ -9213,7 +9307,7 @@
            "homepage": "https://github.com/sebastianbergmann/type",
            "support": {
                "issues": "https://github.com/sebastianbergmann/type/issues",
-                "source": "https://github.com/sebastianbergmann/type/tree/2.3.2"
+                "source": "https://github.com/sebastianbergmann/type/tree/2.3.4"
            },
            "funding": [
                {
@ -9221,7 +9315,7 @@
                    "type": "github"
                }
            ],
-            "time": "2021-06-04T13:02:07+00:00"
+            "time": "2021-06-15T12:49:02+00:00"
        },
        {
            "name": "sebastian/version",
--- a/tests/Entity/ExportTest.php
+++ b/tests/Entity/ExportTest.php
@ -259,4 +259,85 @@ class ExportTest extends TestCase
        $resp->assertDontSee('ExportWizardTheFifth');
    }

+    public function test_page_markdown_export()
+    {
+        $page = Page::query()->first();
+
+        $resp = $this->asEditor()->get($page->getUrl('/export/markdown'));
+        $resp->assertStatus(200);
+        $resp->assertSee($page->name);
+        $resp->assertHeader('Content-Disposition', 'attachment; filename="' . $page->slug . '.md"');
+    }
+
+    public function test_page_markdown_export_uses_existing_markdown_if_apparent()
+    {
+        $page = Page::query()->first()->forceFill([
+            'markdown' => '# A header',
+            'html' => '<h1>Dogcat</h1>',
+        ]);
+        $page->save();
+
+        $resp = $this->asEditor()->get($page->getUrl('/export/markdown'));
+        $resp->assertSee('A header');
+        $resp->assertDontSee('Dogcat');
+    }
+
+    public function test_page_markdown_export_converts_html_where_no_markdown()
+    {
+        $page = Page::query()->first()->forceFill([
+            'markdown' => '',
+            'html' => "<h1>Dogcat</h1><p>Some <strong>bold</strong> text</p>",
+        ]);
+        $page->save();
+
+        $resp = $this->asEditor()->get($page->getUrl('/export/markdown'));
+        $resp->assertSee("# Dogcat\n\nSome **bold** text");
+    }
+
+    public function test_page_markdown_export_does_not_convert_callouts()
+    {
+        $page = Page::query()->first()->forceFill([
+            'markdown' => '',
+            'html' => "<h1>Dogcat</h1><p class=\"callout info\">Some callout text</p><p>Another line</p>",
+        ]);
+        $page->save();
+
+        $resp = $this->asEditor()->get($page->getUrl('/export/markdown'));
+        $resp->assertSee("# Dogcat\n\n<p class=\"callout info\">Some callout text</p>\n\nAnother line");
+    }
+
+    public function test_page_markdown_export_handles_bookstacks_wysiwyg_codeblock_format()
+    {
+        $page = Page::query()->first()->forceFill([
+            'markdown' => '',
+            'html' => '<h1>Dogcat</h1>'."\r\n".'<pre id="bkmrk-var-a-%3D-%27cat%27%3B"><code class="language-JavaScript">var a = \'cat\';</code></pre><p>Another line</p>',
+        ]);
+        $page->save();
+
+        $resp = $this->asEditor()->get($page->getUrl('/export/markdown'));
+        $resp->assertSee("# Dogcat\n\n```JavaScript\nvar a = 'cat';\n```\n\nAnother line");
+    }
+
+    public function test_chapter_markdown_export()
+    {
+        $chapter = Chapter::query()->first();
+        $page = $chapter->pages()->first();
+        $resp = $this->asEditor()->get($chapter->getUrl('/export/markdown'));
+
+        $resp->assertSee('# ' . $chapter->name);
+        $resp->assertSee('# ' . $page->name);
+    }
+
+    public function test_book_markdown_export()
+    {
+        $book = Book::query()->whereHas('pages')->whereHas('chapters')->first();
+        $chapter = $book->chapters()->first();
+        $page = $chapter->pages()->first();
+        $resp = $this->asEditor()->get($book->getUrl('/export/markdown'));
+
+        $resp->assertSee('# ' . $book->name);
+        $resp->assertSee('# ' . $chapter->name);
+        $resp->assertSee('# ' . $page->name);
+    }
+
 }