# Customization

## A great starting point

Project documentation is as diverse as the projects themselves and the Material
theme is a good starting point for making it look great. However, as you write
your documentation, you may reach some point where some small adjustments are
necessary to preserve the style.

## Adding assets

[MkDocs][1] provides several ways to interfere with themes. In order to make a
few tweaks to an existing theme, you can just add your stylesheets and
JavaScript files to the `docs` directory.

  [1]: http://www.mkdocs.org

### Additional stylesheets

If you want to tweak some colors or change the spacing of certain elements,
you can do this in a separate stylesheet. The easiest way is by creating a
new stylesheet file in your docs directory:

``` sh
mkdir docs/stylesheets
touch docs/stylesheets/extra.css
```

Then, add the following line to your `mkdocs.yml`:

``` yaml
extra_css: ['stylesheets/extra.css']
```

Spin up the development server with `mkdocs serve` and start typing your
changes in your additional stylesheet file – you can see them instantly after
saving, as the MkDocs development server implements live reloading. Cool, huh?

### Additional JavaScript

The same is true for additional JavaScript. If you want to integrate another
syntax highlighter or add some custom logic to your theme, create a new
JavaScript file in your docs directory:

``` sh
mkdir docs/javascripts
touch docs/javascripts/extra.js
```

Then, add the following line to your `mkdocs.yml`:

``` yaml
extra_javascript: ['javascripts/extra.js']
```

Further assistance can be found in the [MkDocs documentation][2].

  [2]: http://www.mkdocs.org/user-guide/styling-your-docs/#customizing-a-theme

## Extending the theme

If you want to alter the HTML source (e.g. add or remove some part), you can
extend the theme. From version 0.16 on MkDocs implements [theme extension][3],
an easy way to override parts of a theme without forking and changing the
main theme.

  [3]: http://www.mkdocs.org/user-guide/styling-your-docs/#using-the-theme_dir

### Setup and theme structure

Reference the Material theme as usual in your `mkdocs.yml`, and create a
new folder for overrides, e.g. `theme`, which you reference using `theme_dir`:

``` yaml
theme: 'material'
theme_dir: 'theme'
```

!!! warning "Theme extension prerequisites"

    As the `theme_dir` variable is used for the theme extension process, the
    Material theme needs to be installed via `pip` and referenced with the
    `theme` parameter in your `mkdocs.yml`.

The structure in the theme directory must mirror the directory structure of the
original theme, as any file in the theme directory will replace the file with
the same name which is part of the original theme. Besides, further assets
may also be put in the theme directory.

The directory layout of the Material theme is as follows:

``` sh
.
├─ assets/
│  ├─ images/                          # Images and icons
│  ├─ javascripts/                     # JavaScript
│  └─ stylesheets/                     # Stylesheets
├─ partials/
│  ├─ fonts.html                       # Webfont definitions
│  ├─ footer.html                      # Footer bar
│  ├─ header.html                      # Header bar
│  ├─ nav-item.html                    # Main navigation item
│  ├─ nav.html                         # Main navigation
│  ├─ search.html                      # Search box
│  ├─ source.html                      # Repository information
│  ├─ svgs.html                        # Inline SVG definitions
│  ├─ toc-item.html                    # Table of contents item
│  └─ toc.html                         # Table of contents
├─ 404.html                            # 404 error page
├─ base.html                           # Base template
└─ main.html                           # Default page
```

### Overriding partials

In order to override the footer, we can replace the `footer.html` partial with
our own partial. To do this, create the file `partials/footer.html` in the
theme directory. MkDocs will now use the new partial when rendering the theme.
This can be done with any file.

### Overriding template blocks

Besides overriding partials, one can also override so called template blocks,
which are defined inside the Material theme and wrap specific features. To
override a template block, create a `main.html` inside the theme directory and
define the block, e.g.:

``` jinja
{% extends "base.html" %}

{% block htmltitle %}
  <title>Lorem ipsum dolor sit amet</title>
{% endblock %}
```

The Material theme provides the following template blocks:

| Block name   | Wrapped contents                                |
| ------------ | ----------------------------------------------- |
| `analytics`  | Wraps the Google Analytics integration          |
| `content`    | Wraps the main content                          |
| `extrahead`  | Empty block to define additional meta tags      |
| `fonts`      | Wraps the webfont definitions                   |
| `footer`     | Wraps the footer with navigation and copyright  |
| `header`     | Wraps the fixed header bar                      |
| `htmltitle`  | Wraps the `<title>` tag                         |
| `libs`       | Wraps the JavaScript libraries, e.g. Modernizr  |
| `repo`       | Wraps the repository link in the header bar     |
| `scripts`    | Wraps the JavaScript application logic          |
| `search_box` | Wraps the search form in the header bar         |
| `site_meta`  | Wraps the meta tags in the document head        |
| `site_name`  | Wraps the site name in the header bar           |
| `site_nav`   | Wraps the site navigation and table of contents |
| `styles`     | Wraps the stylesheets (also extra sources)      |

For more on this topic refer to the [MkDocs documentation][4]

  [4]: http://www.mkdocs.org/user-guide/styling-your-docs/#overriding-template-blocks

## Theme development

The Material theme is built on modern technologies like ES6, [Webpack][5],
[Babel][6] and [SASS][7]. If you want to make more fundamental changes, it may
be necessary to make the adjustments directly in the source of the Material
theme and recompile it. This is fairly easy.

  [5]: https://webpack.github.io/
  [6]: https://babeljs.io
  [7]: http://sass-lang.com

### Environment setup

In order to start development on the Material theme, a [Node.js][8] version of
at least 4 is required. Clone the repository from GitHub:

``` sh
git clone https://github.com/squidfunk/mkdocs-material
```

Next, all dependencies need to be installed, which is done with:

``` sh
cd mkdocs-material
npm install
```

  [8]: https://nodejs.org

### Development mode

The Material theme uses a sophisticated asset pipeline using [Gulp][9] and
Webpack which can be started with the following command:

``` sh
npm run start
```

This will also start the MkDocs development server which will monitor changes
on assets, templates and documentation. Point your browser to
[localhost:8000](http://localhost:8000) and you should see this very
documentation in front of your eyes.

For example, changing the color palette is as simple as changing the
`$md-color-primary` and `$md-color-accent` variables in
`src/assets/stylesheets/_config.scss`:

``` css
$md-color-primary: $clr-red-400;
$md-color-accent:  $clr-teal-a700;
```

  [9]: http://gulpjs.com

### Build process

When you finished making your changes, you can build the theme by invoking:

``` sh
npm run build
```

This triggers the production-level compilation and minification of all
stylesheets and JavaScript sources. When the command is ready, the final
theme is located in the `material` directory. Add the `theme_dir` variable
pointing to the aforementioned directory in your original `mkdocs.yml`.

Now you can run `mkdocs build` and you should see your documentation with your
changes to the original Material theme.