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template: overrides/main.html
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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][1] or
during runtime using a JavaScript syntax highlighter.
[1]: https://pygments.org
## Configuration
### Highlight
[:octicons-file-code-24: Source][2] · [:octicons-workflow-24: Extension][3] ·
:octicons-zap-24: Supersedes: [CodeHilite][4]
The [Highlight][3] extension, which is part of [Python Markdown Extensions][5],
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][1] or runtime with a JavaScript highlighter. Remember to add the
necessary [additional stylesheets][6] and [JavaScript][7] 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][10] later in this
document, which also contains some tips on working with line numbers:
``` yaml
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:
``` yaml
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._
[2]: https://github.com/squidfunk/mkdocs-material/blob/master/src/assets/stylesheets/main/extensions/pymdownx/_highlight.scss
[3]: https://facelessuser.github.io/pymdown-extensions/extensions/highlight/
[4]: https://python-markdown.github.io/extensions/code_hilite/
[5]: https://facelessuser.github.io/pymdown-extensions/
[6]: ../customization.md#additional-stylesheets
[7]: ../customization.md#additional-javascript
[8]: https://highlightjs.org/
[9]: https://cdnjs.com/libraries/highlight.js/
[10]: #adding-line-numbers
### InlineHilite
[:octicons-file-code-24: Source][2] · [:octicons-workflow-24: Extension][11]
The [InlineHilite][11] extension, which is part of [Python Markdown
Extensions][5] also integrates with Material for MkDocs and adds support for
__syntax highlighting of inline code blocks__. It's built on top of the
[Highlight][3] extension and can be enabled via `mkdocs.yml`:
``` yaml
markdown_extensions:
- pymdownx.inlinehilite
```
See the section on [inline code blocks][12] for usage information.
[11]: https://facelessuser.github.io/pymdown-extensions/extensions/inlinehilite/
[12]: #highlighting-inline-code-blocks
### Keys
[:octicons-file-code-24: Source][13] · [:octicons-workflow-24: Extension][14]
The [Keys][14] extension, which is part of [Python Markdown Extensions][5],
allows for inserting __keyboard keys__, e.g. ++ctrl+alt+delete++ , and
can be enabled via `mkdocs.yml`:
``` yaml
markdown_extensions:
- pymdownx.keys
```
[13]: https://github.com/squidfunk/mkdocs-material/blob/master/src/assets/stylesheets/main/extensions/pymdownx/_keys.scss
[14]: https://facelessuser.github.io/pymdown-extensions/extensions/keys/
### SuperFences
The [SuperFences][15] extension, which is also part of [Python Markdown
Extensions][5], allows for the __nesting of code blocks inside other blocks__,
and is therefore strongly recommended:
``` yaml
markdown_extensions:
- pymdownx.superfences
```
[15]: https://facelessuser.github.io/pymdown-extensions/extensions/superfences/
### Snippets
The [Snippets][16] extension, which is also part of [Python Markdown
Extensions][5], allows to __insert content from other files__ or other, regular
content, and can be enabled via `mkdocs.yml`:
``` yaml
markdown_extensions:
- pymdownx.snippets
```
[16]: https://facelessuser.github.io/pymdown-extensions/extensions/snippets/
## Usage
This section discusses how to use different syntax highlighting features with
[Pygments][1] – 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][17] to find the
short name for a given language.
_Example_:
```` markdown
``` python
import tensorflow as tf
```
````
_Result_:
``` python
import tensorflow as tf
```
[17]: https://pygments.org/docs/lexers/
### Adding line numbers
Line numbers can be added to a code block by using the `linenums=""`
option directly after the short name, whereas `` 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_:
```` markdown
``` 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_:
``` 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]
```
### 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_:
```` markdown
``` 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_:
``` 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]
```
### Highlighting inline code blocks
When [InlineHilite][18] 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][17].
_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.
[18]: #inlinehilite
### Adding keyboard keys
When [Keys][19] is enabled, keyboard keys can be inserted with a simple syntax.
Consult the [Python Markdown Extensions][16] documentation to learn about all
available short key codes.
_Example_:
```
++ctrl+alt+del++
```
_Result_:
++ctrl+alt+del++
[19]: #keys
### Adding external files
When [Snippets][20] is enabled, content from other files can be inserted, which
is especially useful to reference and embed the contents of source files
directly into your project documentation.
_Example_:
```` markdown
```
--8<-- ".browserslistrc"
```
````
_Result_:
```
--8<-- ".browserslistrc"
```
Note that [Snippets][20] is not limited to code blocks, but can be used anywhere
in a Markdown file to put repeating content into separate files, which is also
explained in the [official documentation][16].
[20]: #snippets