A simple Slack message text formatting to HTML code converter.

• Issues: github.com/datadesk/slackdown/issues
• Packaging: pypi.python.org/pypi/slackdown
• Testing: travis-ci.org/datadesk/slackdown
• Coverage: coveralls.io/r/datadesk/slackdown

pip install slackdown

Import the library.

import slackdown

Convert a Slack message to HTML using the render function.

>>> slackdown.render('*bold*')
'<p><b>bold</b></p>'

>>> slackdown.render('_italics_')
'<p><i>italics</i></p>'

All inline elements will be rendered inside <p> tags unless they are already wrapped in another block element like <pre>,<blockquote>,<ul>, or <ol> tags.

slackdown includes multiple features of Slack messages including all the one's highlighted in Slack's message formatting documentation.

• Text surrounded by _underscores_ will be rendered inside <i> tags.
• Text surrounded by *asterisks* will be rendered inside <b> tags.

• Text surrounded by ~tildes~ will be rendered inside <s> tags.

• Lines of text that begin with a bullet(•), hyphen(-), or digit followed by a period(1.) will be rendered inside <li> tags.
• Bulleted and hyphened lists are rendered inside <ul> tags.
• Numbered lists are rendered inside <ol> tags.
  • Note that the numbers used in the original text will be ignored and they will instead be rendered using your CSS list style.
• To include multiple lists add an extra line break between them. This line break will not be rendered in the final HTML.

- item 1
- item 2
- item 3

1. item 1
2. item 2
3. item 3

is rendered as

<ul>
   <li>item 1</li>
   <li>item 2</li>
   <li>item 3</li>
</ul>
<ol>
   <li>item 1</li>
   <li>item 2</li>
   <li>item 3</li>
</ol>

• Lines of text that start with a >s are rendered inside <blockquote> tags.
• Text blocks that include a line starting with three >s will render the message from that point on inside <blockquote> tags. Note: the Slack API returns all > as > because angle brackets are used for links in Slack text formatting See the documentation for more.

> A blockquote line
>>> Multiple lines
of a
blockquote

is rendered as

<blockquote>A blockquote line</blockquote>
<blockquote>
    Multiple lines </br>
    of a </br>
    blockquote
</blockquote>

• Text surrounded in `backticks` will be rendered inside <code> tags.
• Text surrounded by ```three backticks``` will be rendered inside <pre> tags.

• Text surrounded by < angle brackets > will be rendered inside <a> tags with target="blank" and their contents as the href.

• Line breaks rendered inside <p> tags will close the tag and start a new paragraph. Line breaks in other block elements will be rendered as <br /> tags.

Multiple
lines of
paragraph text

` ` `
Multiple
lines of
pre text
` ` `

is rendered as

<p>Multiple</p>
<p>lines of</p>
<p>paragraph text</p>
<p></p>
<pre>
Multiple <br />
lines of <br />
pre text
</pre>

• Since extra whitespace is stripped in HTML, any extra space is rendered using &nbsp. Every two space characters are rendered as a space character and a &nbsp. This minimizes added characters while keeping the same amount of rendered whitespace as the original text.