From be5c5d2acb37a32d253f964fcc928ffcfb94c2f4 Mon Sep 17 00:00:00 2001
From: Matt Baer <matt@write.as>
Date: Mon, 30 Apr 2018 23:37:39 -0400
Subject: [PATCH] Add ApplyBasicMarkdown func

---
 posts/render.go | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/posts/render.go b/posts/render.go
index 90099dd..157bed2 100644
--- a/posts/render.go
+++ b/posts/render.go
@@ -4,11 +4,15 @@ import (
 	"github.com/microcosm-cc/bluemonday"
 	"github.com/writeas/saturday"
 	"regexp"
+	"strings"
+	"unicode"
 )
 
 var (
 	blockReg    = regexp.MustCompile("<(ul|ol|blockquote)>\n")
 	endBlockReg = regexp.MustCompile("</([a-z]+)>\n</(ul|ol|blockquote)>")
+
+	markeddownReg = regexp.MustCompile("<p>(.+)</p>")
 )
 
 func ApplyMarkdown(data []byte) string {
@@ -35,3 +39,25 @@ func ApplyMarkdown(data []byte) string {
 
 	return outHTML
 }
+
+func ApplyBasicMarkdown(data []byte) string {
+	mdExtensions := 0 |
+		blackfriday.EXTENSION_STRIKETHROUGH |
+		blackfriday.EXTENSION_SPACE_HEADERS |
+		blackfriday.EXTENSION_HEADER_IDS
+	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
+}