fix: #36 crash when attachment in content

Author: shaunthegeek

app/Confluence.php

@@ -35,8 +35,13 @@ public function parsePageHtml(string $filename, string $spaceName): array
 
     public function htmlFile2Markdown(string $filename): string
     {
+        $html = preg_replace(
+            '|<span class="confluence-embedded-file-wrapper">.*</span>|',
+            '',
+            file_get_contents($filename)
+        );
         libxml_use_internal_errors(true);
-        $this->document->loadHTMLFile($filename);
+        $this->document->loadHTML($html);
 
         $html = $this->document->saveHTML($this->document->getElementById('main-content'));
         return $this->htmlConverter->convert($html);

tests/data/confluence/space1/attachment-demo_65615.html

@@ -34,6 +34,7 @@ <h1 id="title-heading" class="pagetitle">
                 Created by <span class='author'> admin</span>, last modified on 六月 08, 2021
             </div>
             <div id="main-content" class="wiki-content group">
+                <p><span class="confluence-embedded-file-wrapper"><a class="confluence-embedded-file" href="/download/attachments/65638/11.xlsx?version=1&amp;modificationDate=1627224902336&amp;api=v2" data-nice-type="Excel Spreadsheet" data-file-src="/download/attachments/65638/11.xlsx?version=1&amp;modificationDate=1627224902336&amp;api=v2" data-linked-resource-id="65651" data-linked-resource-type="attachment" data-linked-resource-container-id="65638" data-linked-resource-default-alias="11.xlsx" data-mime-type="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" data-has-thumbnail="true" data-linked-resource-version="1"><img src="rest/documentConversion/latest/conversion/thumbnail/65651/1" height="250"/></a></span></p>
                 <p>This is a demo page with attachment. <a href="attachments/65615/65616.txt"
                                                            data-linked-resource-id="65616"
                                                            data-linked-resource-version="1"