How can I render markdown to html with Blackfriday in Go? - templates

Question

I have a struct like this:
type Page struct {
Content string
}
then I read a markdown file and assign to a variable:
data, err := ioutil.ReadFile("a.md")
lines = string(data)
page.Content = markdownRender([]byte(lines))
The markdown file is like this:
##Hello World
###Holo Go
and then I put it into markdown render function and return a string value:
func markdownRender(content []byte) string {
htmlFlags := 0
htmlFlags |= blackfriday.HTML_USE_SMARTYPANTS
htmlFlags |= blackfriday.HTML_SMARTYPANTS_FRACTIONS
renderer := blackfriday.HtmlRenderer(htmlFlags, "", "")
extensions := 0
extensions |= blackfriday.EXTENSION_NO_INTRA_EMPHASIS
extensions |= blackfriday.EXTENSION_TABLES
extensions |= blackfriday.EXTENSION_FENCED_CODE
extensions |= blackfriday.EXTENSION_AUTOLINK
extensions |= blackfriday.EXTENSION_STRIKETHROUGH
extensions |= blackfriday.EXTENSION_SPACE_HEADERS
return string(blackfriday.Markdown(content, renderer, extensions))
}
and finally I call the page.Content in a html template and generate a static html:
{{.Content}}
but in the generated html it shows in the browser (I tried it in the chrome and safari) is like this (not the source code, it just shows in the page):
<p>##Hello World ###Holo Go </p>
but I want it like this
Hello World
Holo Go
So, how can I do this？

Answer 1

First, your markdown input is not quite right -- headings should have whitespace separating the #s from the text. You can verify this using blackfriday-tool:
$ echo ##Hello | blackfriday-tool
<p>##Hello</p>
$ echo ## Hello | blackfriday-tool
<h2>Hello</h2>
Second, if you feed the HTML output from blackfriday into a html/template, it is going to be automatically escaped for safety.
If you trust the markdown input and blackfriday's HTML output, then you can tell the template system to trust the content by wrapping it in a html/template HTML value:
type Page struct {
Content template.HTML
}
err = t.ExecuteTemplate(w, "page", Page{Content: template.HTML(s)})
See http://play.golang.org/p/eO7KDJMlb8 for an example.