mirror of
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153 lines
3.0 KiB
Markdown
153 lines
3.0 KiB
Markdown
---
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template: overrides/main.html
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---
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# Variables
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Macros and variables are powerful tools to parametrize Markdown files, as they
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allow to perform Jinja templating directly from Markdown. This is especially
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useful to include technical data from other files and add central variables via
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`mkdocs.yml`.
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## Configuration
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### Macros
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The [macros][1] plugin adds support to reference variables and call macros and
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supports Jinja templating directly from Markdown. It can be installed with
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`pip`:
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```
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pip install mkdocs-macros-plugin
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```
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Then, add the following to `mkdocs.yml`:
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``` yaml
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plugins:
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- macros
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```
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[1]: https://github.com/fralau/mkdocs_macros_plugin
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## Usage
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### Using predefined variables
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A set of predefined variables is enabled by default and can be used from
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Markdown, including data from `mkdocs.yml`. More specifically, predefined
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variables fall into the following categories:
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- `config.*`: configuration parameters from `mkdocs.yml`
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- `page.*`: metadata and content of current page
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- `navigation.*`: list of all pages and sections
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- `environment.*`: underlying operating system
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- `git.*`: git-related information, if available
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_Example_:
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``` markdown
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Welcome to {{ config.site_name }}!
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```
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_Result_:
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``` markdown
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Welcome to Material for MkDocs!
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```
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A list of all predefined variables can be printed with:
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```
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{{ macros_info() }}
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```
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### Using custom variables
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All data defined under `extra` in `mkdocs.yml` is automatically exposed as a
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variable and can be used from the template. This enables centralized parameter
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storage and management.
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_Example_:
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=== "`docs/page.md`"
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```` markdown
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The unit price is {{ unit.price }}
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````
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=== "`mkdocs.yml`"
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``` yaml
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extra:
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unit:
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price: 12.50
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```
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_Result_:
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The unit price is 12.50.
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### Using variables in snippets
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The [macros][2] plugin can be used to allow variables in snippets, which is not
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possible with the [Snippets][3] extension alone. Add the snippets location to
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the plugin configuration in `mkdocs.yml`:
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``` yaml
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plugins:
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- search
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- macros:
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include_dir: snippets
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```
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In your Markdown file, include snippets with Jinja's [`include`][4] function:
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``` markdown
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{% include "definitions.md" %}
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```
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_Example_:
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=== "`snippets/definitions.md`"
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``` markdown
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The unit price is {{ page.meta.unit.price }}
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```
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=== "`docs/page-1.md`"
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``` markdown
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---
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unit:
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price: 12.50
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---
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{% include "definitions.md" %}
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```
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=== "`docs/page-2.md`"
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``` markdown
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---
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unit:
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price: 25.00
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---
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{% include "definitions.md" %}
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```
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[2]: #macros
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[3]: https://facelessuser.github.io/pymdown-extensions/extensions/snippets/
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[4]: https://jinja.palletsprojects.com/en/2.11.x/templates/#include
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## Customization
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### Custom macros
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The [macros][1] plugin allows to define custom macros, which can then be used
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from Markdown files. See the [official documentation][5] for more information
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how to define custom macros.
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[5]: https://mkdocs-macros-plugin.readthedocs.io/en/latest/python/
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