Print PDF from HTML string

[yasin-96]

Hey` guys,

I am trying to figure out why my code is not working as expected.
I have markdown source code, which I am converting with: https://github.com/gomarkdown/markdown
It is giving me some html string, which I am trying to print to a PDF, but when I print it to a PDF the HTML tags are ignored and just plaintext is printed.

My code:

_, lineHt := pdf.GetFontSize()
html := pdf.HTMLBasicNew()
convertedHTML := convertMarkdown(subchapter.Content)
println(string(convertedHTML))
html.Write(lineHt, string(convertedHTML))
err := pdf.OutputFileAndClose(fmt.Sprintf("%s.pdf", course.Name))

func convertMarkdown(subchapterContent string) []byte {
	extensions := parser.CommonExtensions | parser.OrderedListStart | parser.NoEmptyLineBeforeBlock
	p := parser.NewWithExtensions(extensions)
	doc := p.Parse([]byte(subchapterContent))

	htmlFlags := html.CommonFlags | html.HrefTargetBlank
	opts := html.RendererOptions{Flags: htmlFlags}
	renderer := html.NewRenderer(opts)

	return markdown.Render(doc, renderer)
}

The convert returns me this string

<h2>Chapter outcomes</h2>

<p>At the end of this page you should be able to:</p>

<ul>
<li>Explain how the Cloud Native Computing Foundation (CNCF) defines the Cloud Native terms and their core characteristics.</li>
<li>Describe monolith vs. microservices architecture approaches with examples as well as the benefits and drawbacks of both approaches.</li>
<li>Describe different autoscaling options in Cloud Native environments.</li>
<li>Describe the concept and benefits of serverless computing.</li>
<li>Explain community and governance</li>
<li>Explain the roles and personas that exist within Cloud Native environments and their corresponding tasks?</li>
<li>Describe which open standards are available in Cloud Native world and what they are used for?</li>
</ul>

[yasin-96]

Can anybody help with this ?

[jaredweinfurtner]

If you want to print from HTML, use chromedp.

func htmlToPDF(ctx context.Context, htmlContent string) ([]byte, error) {
	ctx, cancel := chromedp.NewContext(ctx)
	defer cancel()

	var pdfBuffer []byte
	err := chromedp.Run(ctx,
		chromedp.Navigate("data:text/html,"+htmlContent),
		chromedp.ActionFunc(func(ctx context.Context) error {
			var err error
			pdfBuffer, _, err = page.PrintToPDF().
				WithPrintBackground(true).
				WithPaperWidth(8.27).
				WithPaperHeight(11.7).
				WithMarginTop(0.4).
				WithMarginBottom(0.4).
				WithMarginLeft(0.4).
				WithMarginRight(0.4).
				Do(ctx)
			return err
		}),
	)

	return pdfBuffer, err
}