html-to-markdown

Convert HTML into Markdown with Go. It is using an HTML Parser to avoid the use of

regexp

Installation

go get github.com/JohannesKaufmann/html-to-markdown

Usage

import md "github.com/JohannesKaufmann/html-to-markdown"

converter := md.NewConverter("", true, nil)
html = <strong>Important</strong>
markdown, err := converter.ConvertString(html)
if err != nil {
  log.Fatal(err)
}
fmt.Println("md ->", markdown)

If you are already using goquery you can pass a selection to

Convert

markdown, err := converter.Convert(selec)

Using it on the command line

If you want to make use of

html-to-markdown

html2md

html-to-markdown

Options

The third parameter to

md.NewConverter

*md.Options

For example you can change the character that is around a bold text ("

**

__

StrongDelimiter

opt := &md.Options{
  StrongDelimiter: "__", // default: **
  // ...
}
converter := md.NewConverter("", true, opt)

For all the possible options look at godocs and for a example look at the example.

Adding Rules

converter.AddRules(
  md.Rule{
    Filter: []string{"del", "s", "strike"},
    Replacement: func(content string, selec *goquery.Selection, opt *md.Options) *string {
      // You need to return a pointer to a string (md.String is just a helper function).
      // If you return nil the next function for that html element
      // will be picked. For example you could only convert an element
      // if it has a certain class name and fallback if not.
      content = strings.TrimSpace(content)
      return md.String("~" + content + "~")
    },
  },
  // more rules
)

For more information have a look at the example add_rules.

Using Plugins

If you want plugins (github flavored markdown like striketrough, tables, ...) you can pass it to

Use

import "github.com/JohannesKaufmann/html-to-markdown/plugin"

// Use the GitHubFlavored plugin from the plugin package.
converter.Use(plugin.GitHubFlavored())

Or if you only want to use the

Strikethrough

converter.Use(plugin.Strikethrough(""))

For more information have a look at the example github_flavored.

Writing Plugins

Have a look at the plugin folder for a reference implementation. The most basic one is Strikethrough.

Other Methods

Godoc

func (c *Converter) Keep(tags ...string) *Converter

Determines which elements are to be kept and rendered as HTML.

func (c *Converter) Remove(tags ...string) *Converter

Determines which elements are to be removed altogether i.e. converted to an empty string.

Issues

If you find HTML snippets (or even full websites) that don't produce the expected results, please open an issue!

Related Projects

• turndown (js), a very good library written in javascript.
• lunny/html2md, which is using regex instead of goquery. I came around a few edge case when using it (leaving some html comments, ...) so I wrote my own.