mkdocs-material/docs/reference/code-blocks.md

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Code blocks

Code blocks and examples are an essential part of technical project documentation. Material for MkDocs provides different ways to set up syntax highlighting for code blocks, either during build time using Pygments or during runtime using a JavaScript syntax highlighter.

Configuration

Highlight

:octicons-file-code-24: Source · :octicons-workflow-24: Extension · :octicons-zap-24: Supersedes: CodeHilite

The Highlight extension, which is part of Python Markdown Extensions, integrates with Material for MkDocs and provides several options for configuring syntax highlighting of code blocks:

use_pygments{: #use_pygments }

:octicons-milestone-24: Default: true – This option allows to control whether highlighting should be carried out during build time by Pygments or runtime with a JavaScript highlighter. Remember to add the necessary additional stylesheets and JavaScript if you want to use the latter:

=== "Pygments"

``` yaml
markdown_extensions:
  - pymdownx.highlight:
      use_pygments: true
```

=== "JavaScript"

``` yaml
markdown_extensions:
  - pymdownx.highlight:
      use_pygments: false
```

??? example "Syntax highlighting with Highlight.js"

[Highlight.js][8] can be integrated by creating an [additional
JavaScript][7] file initializing the highlighter and including the 
respective stylesheet and JavaScript from a [CDN][9] serving
Highlight.js in `mkdocs.yml`:

=== "docs/javascripts/extra.js"

    ``` js
    hljs.initHighlighting()
    ```

=== "mkdocs.yml"

    ``` yaml
    extra_javascript:
      - https://cdnjs.cloudflare.com/ajax/libs/highlight.js/10.1.1/highlight.min.js
      - javascripts/extra.js
    extra_css:
      - https://cdnjs.cloudflare.com/ajax/libs/highlight.js/10.1.1/styles/default.min.css
    ```

Note that Highlight.js has no affiliation with the Highlight extension.

linenums{: #linenums }

:octicons-milestone-24: Default: false – This option will add line numbers to all code blocks. If you wish to add line numbers to some, but not all code blocks, consult the section on adding line numbers later in this document, which also contains some tips on working with line numbers:

markdown_extensions:
  - pymdownx.highlight:
      linenums: true

linenums_style{: #linenums_style }

:octicons-milestone-24: Default: table – The Highlight extension provides three ways to add line numbers, all of which are supported by Material for MkDocs. While table wraps a code block in a table, inline and pymdownx.inline render line numbers as part of the line itself:

markdown_extensions:
  - pymdownx.highlight:
      linenums_style: pymdownx.inline

Note that inline will put line numbers next to the actual code, which means that they will be included when selecting text with the cursor or copying a code block to the clipboard. Thus, the usage of table or pymdownx.inline is recommended.

Material for MkDocs doesn't provide official support for the other options of this extension, so they may be supported but can also yield weird results. Use them at your own risk.

InlineHilite

:octicons-file-code-24: Source · :octicons-workflow-24: Extension

The InlineHilite extension, which is part of Python Markdown Extensions also integrates with Material for MkDocs and adds support for syntax highlighting of inline code blocks. It's built on top of the Highlight extension and can be enabled from mkdocs.yml:

markdown_extensions:
  - pymdownx.inlinehilite

See the section on inline code blocks for usage information.

SuperFences

:octicons-file-code-24: Source · :octicons-workflow-24: Extension

The SuperFences extension, which is also part of Python Markdown Extensions, allows for the nesting of code blocks inside other blocks, and is therefore strongly recommended:

markdown_extensions:
  - pymdownx.superfences

Keys

:octicons-file-code-24: Source · :octicons-workflow-24: Extension

The Keys extension, which is part of Python Markdown Extensions, allows for inserting keyboard keys, e.g. ++ctrl+alt+delete++ , and can be enabled from mkdocs.yml:

markdown_extensions:
  - pymdownx.keys

Usage

This section discusses how to use different syntax highlighting features with Pygments – the default highlighter – so they don't apply when using a JavaScript syntax highlighter.

Specifying the language

Code blocks must be enclosed with two separate lines containing three backticks. To add code highlighting to those blocks, add the language short name directly after the opening block. See the list of available lexers to find the short name for a given language.

Example:

``` python
import tensorflow as tf
```

Result:

import tensorflow as tf

Adding line numbers

Line numbers can be added to a code block by using the linenums="<start>" option directly after the short name, whereas <start> represents the starting line number. A code block can start from a line number other than 1, which allows splitting large code blocks for readability.

Example:

``` python linenums="1"
def bubble_sort(items):
    for i in range(len(items)):
        for j in range(len(items) - 1 - i):
            if items[j] > items[j + 1]:
                items[j], items[j + 1] = items[j + 1], items[j]
```

Result:

def bubble_sort(items):
    for i in range(len(items)):
        for j in range(len(items) - 1 - i):
            if items[j] > items[j + 1]:
                items[j], items[j + 1] = items[j + 1], items[j]

Highlighting specific lines

Specific lines can be highlighted by passing the line numbers to the hl_lines argument placed right after the language short name. Note that line counts start at 1, regardless of the starting line number specified as part of linenums.

Example:

``` python hl_lines="2 3"
def bubble_sort(items):
    for i in range(len(items)):
        for j in range(len(items) - 1 - i):
            if items[j] > items[j + 1]:
                items[j], items[j + 1] = items[j + 1], items[j]
```

Result:

def bubble_sort(items):
    for i in range(len(items)):
        for j in range(len(items) - 1 - i):
            if items[j] > items[j + 1]:
                items[j], items[j + 1] = items[j + 1], items[j]

Highlighting inline code blocks

When InlineHilite is enabled, inline code blocks can be highlighted by prefixing them with a shebang-like sequence, i.e. #!, directly followed by the language short name.

Example:

The `#!python range()` function is used to generate a sequence of numbers.

Result:

The #!python range() function is used to generate a sequence of numbers.

Displaying keyboard keys

When Keys is enabled, keyboard keys can be inserted with a simple syntax. See the Python Markdown Extensions documentation for a list of all available keys.

Example:

++ctrl+alt+del++

Result:

++ctrl+alt+del++