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atom/docs/themes.md

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# Themes
## Selecting A Theme
Atom comes bundles with two themes "Atom - Dark" and "Atom - Light".
Because Atom themes are based on CSS, it's possible to have multiple themes
active at the same time. For example, you'll usually select a theme for the UI
and another theme for syntax highlighting. You can select themes by specifying
them in the `core.themes` array in your `config.cson`:
```coffee-script
core:
themes: ["atom-light-ui", "atom-light-syntax"]
# or, if the sun is going down:
# themes: ["atom-dark-ui", "atom-dark-syntax"]
```
## Installing A Theme
You install themes by placing them in the `~/.atom/themes` directory. The most
basic theme is just a `.css` file. More complex themes occupy their own folder,
which can contain multiple stylesheets along with an optional `package.cson`
file containing a manifest to control their load-order:
```text
~/.atom/themes/
rockstar.css
rainbow/
package.json
core.css
editor.css
tree-view.css
```
package.cson:
```coffee-script
stylesheets: ["core.css", "editor.less", "tree-view.css"]
```
The `package.cson` file specifies which stylesheets to load and in what order
with the `stylesheets` key. If no manifest is specified, all stylesheets are
loaded in alphabetical order when the user selects the theme.
## TextMate Compatibility
If you place a TextMate theme (either `.tmTheme` or `.plist`) in the `themes`
directory, it will automatically be translated from TextMate's format to CSS
so it works with Atom. There are a few slight differences between TextMate's
semantics and those of stylesheets, but they should be negligible in practice.
## Authoring A Theme
If you understand CSS, you can write an Atom theme easily. Your theme can style
Atom's user interface, specify the appearance of syntax-highlighted code, or
both. For making a syntax highlighting theme, refer to
[section 12.4 of the TextMate Manual](http://manual.macromates.com/en/language_grammars.html)
for a list of the common scopes used by TextMate grammars. You'll just need to
translate scope names to CSS classes. To theme Atom's user interface, take a
look at the existing light and dark themes for an example. Pressing `alt-meta-i`
and inspecting the Atom's markup directly can also be helpful.
## Theme Extensions (Not Yet Implemented)
A theme may need to be extended to cover DOM elements that are introduced by a
third-party Atom package. When a package is loaded, stylesheets with the same
name as the package will automatically be loaded from the `packages` directory
of active themes:
```text
~/.atom/themes/
midnight/midnight.less
midnight/packages/terminal.less
midnight/packages/tree-view.less
```
In the example above, if the `midnight` theme is active, its `terminal` and
`tree-view` stylesheets will be loaded automatically if and when those packages
are activated. If you author an extension to a theme consider sending its author
a pull request to have it included in the theme by default. Package-specific
theme stylesheets need not be listed in the theme's `package.json` because they
will be loaded automatically when the package is loaded.