From 251490523da5d4774e10c533ba5f27a079f388d1 Mon Sep 17 00:00:00 2001
From: Matt Baer <matt@write.as>
Date: Wed, 15 Dec 2021 15:57:19 -0500
Subject: [PATCH] Add ApplyBasicAccessibleMarkdown func

---
 posts/render.go | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/posts/render.go b/posts/render.go
index d0885d5..5fede8f 100644
--- a/posts/render.go
+++ b/posts/render.go
@@ -63,6 +63,31 @@ func ApplyBasicMarkdown(data []byte) string {
 	return outHTML
 }
 
+// ApplyBasicAccessibleMarkdown applies Markdown to the given data, rendering basic text formatting and preserving hard
+// line breaks. It is meant for formatting text in small, multi-line UI elements, like user profile biographies.
+func ApplyBasicAccessibleMarkdown(data []byte) string {
+	mdExtensions := 0 |
+		blackfriday.EXTENSION_STRIKETHROUGH |
+		blackfriday.EXTENSION_SPACE_HEADERS |
+		blackfriday.EXTENSION_HEADER_IDS |
+		blackfriday.EXTENSION_HARD_LINE_BREAK
+	htmlFlags := 0 |
+		blackfriday.HTML_SKIP_HTML |
+		blackfriday.HTML_USE_SMARTYPANTS |
+		blackfriday.HTML_SMARTYPANTS_DASHES
+
+	// Generate Markdown
+	md := blackfriday.Markdown([]byte(data), blackfriday.HtmlRenderer(htmlFlags, "", ""), mdExtensions)
+	// Strip out bad HTML
+	policy := bluemonday.UGCPolicy()
+	policy.AllowAttrs("class", "id").Globally()
+	outHTML := string(policy.SanitizeBytes(md))
+	outHTML = markeddownReg.ReplaceAllString(outHTML, "$1")
+	outHTML = strings.TrimRightFunc(outHTML, unicode.IsSpace)
+
+	return outHTML
+}
+
 // StripHTMLWithoutEscaping strips HTML tags with bluemonday's StrictPolicy, then unescapes the HTML
 // entities added in by sanitizing the content.
 func StripHTMLWithoutEscaping(content string) string {