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Code blocks

Zulip supports the standard Markdown syntax for code blocks:

Inline: `let x = 5`

Code block:
```
def f(x):
   return x+1
```

Syntax highlighting:
```python
def fib(n):
    # TODO: base case
    return fib(n-1) + fib(n-2)
```

Sending the above message in Zulip will render like this:

You can also use ~~~ to start codeblocks, or just indent the code 4 or more spaces.

A widget in the upper-right corner of code blocks allows you to easily copy the code to your clipboard.

Language tagging

Tagging a code block with a language enables syntax highlighting and (if configured) code playgrounds. Zulip supports syntax highlighting for hundreds of languages.

A code block can be tagged by typing the language name after the fence (```) that begins a code block, as shown here. Typeahead will help you enter the name for the language. The Short names values from the Pygments lexer documentation are the complete set of values that support syntax highlighting.

``` python
print("Hello world!")
```

Default code block language

Organization administrators can also configure a default language for code blocks, which will be used whenever the code block has no tag.

{!admin-only.md!}

{start_tabs}

{settings_tab|organization-settings}

Under Other settings, edit Default language for code blocks.

{end_tabs}

When a default language is configured, one can use ````text` to display code blocks without any syntax highlighting (E.g. to paste an error message).

Code playgrounds

Code playgrounds are interactive in-browser development environments, such as replit, that are designed to make it convenient to edit and debug code. Code playgrounds can be configured for any programming language. Zulip code blocks that are tagged with the language will have a button visible on hover that allows you to open the code block in the code playground site.

Add a custom code playground

{!admin-only.md!}

{start_tabs}

{settings_tab|playground-settings}

Under Add a new code playground, enter a Name, Language and URL prefix.
Click Add code playground.

{end_tabs}

For example, to configure code playgrounds for languages like Python or JavaScript, you could specify the language and URL prefix fields as:

Python and https://replit.com/languages/python3/?code=
JavaScript and https://replit.com/languages/javascript/?code=

When a code block is labeled as Python or JavaScript (either explicitly or by organization default), users would get a on-hover option to open the code block in the speficied code playground.

Technical details

You can configure multiple playgrounds for a given language; if you do that, the user will get to choose which playground to open the code in.
The Language field is the human-readable Pygments language name for that programming language. The language tag for a code block is internally mapped to these human-readable Pygments names. E.g: py3 and py are mapped to Python. One can use the typeahead (which appears when you type something or just click on the language field) to lookup the Pygments name.
The links for opening code playgrounds are always constructed by concatenating the provided URL prefix with the URL-encoded contents of the code block.
Code playground sites do not always clearly document their URL format; often you can just get the prefix from your browser's URL bar.
You can also use a custom language name to implement simple integrations. For example, a code block tagged with the "language" send_tweet could be used with a "playground" that sends the content of the code block as a Tweet.

If you have any trouble setting in setting up a code playground, please contact us with details on what you're trying to do, and we'll be happy to help you out.

Math blocks, spoiler blocks, and quote blocks use similar fenced block syntax.

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