Start leveling up extension docs

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# Authoring Packages
A package can contain a variety of different resource types to change Atom's
behavior. The basic package layout is as follows (not every package will
have all of these directories):
```text
my-package/
lib/
config/
stylesheets/
keymaps/
snippets/
grammars/
package.json
index.coffee
```
**NOTE:** NPM behavior is partially implemented until we get a working Node.js
API built into Atom. The goal is to make Atom packages be a superset of NPM
packages
## package.json
Similar to npm packages, Atom packages can contain a `package.json` file in their
top-level directory. This file contains metadata about the package, such as the
path to its "main" module, library dependencies, and manifests specifying the
order in which its resources should be loaded.
## Source Code
If you want to extend Atom's behavior, your package should contain a single
top-level module, which you export from `index.coffee` or another file as
indicated by the `main` key in your `package.json` file. The remainder of your
code should be placed in the `lib` directory, and required from your top-level
file.
Your package's top-level module is a singleton object that manages the lifecycle
of your extensions to Atom. Even if your package creates ten different views and
appends them to different parts of the DOM, it's all managed from your top-level
object. Your package's top-level module should implement the following methods:
- `activate(rootView, state)` **Required**: This method is called when your
package is loaded. It is always passed the window's global `rootView`, and is
sometimes passed state data if the window has been reloaded and your module
implements the `serialize` method.
- `serialize()` **Optional**: This method is called when the window is shutting
down, allowing you to return JSON to represent the state of your component. When
the window is later restored, the data you returned will be passed to your
module's `activate` method so you can restore your view to where the user left
off.
- `deactivate()` **Optional**: This method is called when the window is shutting
down. If your package is watching any files or holding external resources in any
other way, release them here. If you're just subscribing to things on window
you don't need to worry because that's getting torn down anyway.
## A Simple Package Layout:
```text
my-package/
package.json # optional
index.coffee
lib/
my-package.coffee
```
`index.coffee`:
```coffeescript
module.exports = require "./lib/my-package"
```
`my-package/my-package.coffee`:
```coffeescript
module.exports =
activate: (rootView, state) -> # ...
deactivate: -> # ...
serialize: -> # ...
```
Beyond this simple contract, your package has full access to Atom's internal
API. Anything we call internally, you can call as well. Be aware that since we
are early in development, APIs are subject to change and we have not yet
established clear boundaries between what is public and what is private. Also,
Please collaborate with us if you need an API that doesn't exist. Our goal is
to build out Atom's API organically based on the needs of package authors like
you. See [Atom's built-in packages](https://github.com/github/atom/tree/master/src/packages)
for examples of Atom's API in action.
## Stylesheets
Stylesheets for your package should be placed in the `stylesheets` directory.
Any stylesheets in this directory will be loaded and attached to the DOM when
your package is activated. An optional `stylesheets` key in your `package.json`
can list the stylesheets by name in order to specify a load order; otherwise
stylesheets are loaded alphabetically.
## Keymaps
Keymaps are placed in the `keymaps` subdirectory. By default, all keymaps will be
loaded in alphabetical order unless there is a `keymaps` array in `package.json`
specifying which keymaps to load and in what order. It's a good idea to provide
default keymaps for your extension. They can be customized by users later. See
the (main keymaps documentation)[#keymaps] for more information on how keymaps
work.
## Snippets
An extension can supply snippets in a `snippets` directory as `.cson` or `.json`
files:
```coffeescript
".source.coffee .specs":
"Expect":
prefix: "ex"
body: "expect($1).to$2"
"Describe":
prefix: "de"
body: """
describe "${1:description}", ->
${2:body}
"""
```
A snippets file contains scope selectors at its top level. Each scope selector
contains a hash of snippets keyed by their name. Each snippet specifies a
`prefix` and a `body` key.
All files in the directory will be automatically loaded, unless the
`package.json` supplies a `snippets` key as a manifest. As with all scoped
items, snippets loaded later take precedence over earlier snippets when two
snippets match a scope with the same specificity.

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## Command Panel
# Command Panel
A partial implementation of the [Sam command language](http://man.cat-v.org/plan_9/1/sam)
The command panel contains a partial implementation of the [Sam command language](http://man.cat-v.org/plan_9/1/sam).
In addition, packages are free to design and define any scoped command.
*Examples*
Pop open the command line by hitting .
You can get a list of commands available to Atom (including any keybindings) by hitting `meta-p`.
`,` selects entire file
## Examples
`1,4` selects lines 1-4
`,` selects the entire file
`1,4` selects lines 1-4 in the current file
`/pattern` selects the first match after the cursor/selection
`s/pattern/replacement` replace first text matching pattern in current selection
`s/pattern/replacement` replaces the first text matching pattern in current selection
`s/pattern/replacement/g` replace all text matching pattern in current selection
`s/pattern/replacement/g` replaces all text matching pattern in current selection
`,s/pattern/replacement/g` replace all text matching pattern in file
`,s/pattern/replacement/g` replaces all text matching pattern in file
`1,4s/pattern/replacement` replace all text matching pattern in lines 1-4
`1,4s/pattern/replacement` replaces all text matching pattern in lines 1-4
`x/pattern` selects all matches in the current selections

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## Wrap Guide
The `wrap-guide` extension places a vertical line in each editor at a certain
column to guide your formatting so lines do not exceed a certain width.
column to guide your formatting, so lines do not exceed a certain width.
By default the wrap-guide is placed at the 80th column.
By default, the wrap-guide is placed at the 80th column.
### Configuration
You can customize where the column is placed using the `wrapGuide.columns`
config option.
config option:
config.cson:
```coffee-cript
```coffeescript
"wrap-guide":
columns: [
{ pattern: "\.mm$", column: 200 },

138
docs/configuring-atom.md Normal file
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# Configuration Settings
## Your .atom Directory
When you install Atom, an _.atom_ directory is created in your home directory.
If you press `meta-,`, that directory is opened in a new window. For the
time being, this serves as the primary interface for adjusting configuration
settings, adding and changing key bindings, tweaking styles, etc.
Atom loads configuration settings from the `config.cson` file in your _~/.atom_
directory, which contains CoffeeScript-style JSON:
```coffeescript
core:
hideGitIgnoredFiles: true
editor:
fontSize: 18
```
Configuration is broken into namespaces, which are defined by the config hash's
top-level keys. In addition to Atom's core components, each package may define
its own namespace.
## Glossary of Config Keys
- `core`
- `disablePackages`: An array of package names to disable
- `hideGitIgnoredFiles`: Whether files in the _.gitignore_ should be hidden
- `ignoredNames`: File names to ignore across all of Atom (not fully implemented)
- `themes`: An array of theme names to load, in cascading order
- `autosave`: Save a buffer when its view loses focus
- `editor`
- `autoIndent`: Enable/disable basic auto-indent (defaults to `true`)
- `autoIndentOnPaste`: Enable/disable auto-indented pasted text (defaults to `false`)
- `nonWordCharacters`: A string of non-word characters to define word boundaries
- `fontSize`: The editor font size
- `fontFamily`: The editor font family
- `invisibles`: Specify characters that Atom renders for invisibles in this hash
- `tab`: Hard tab characters
- `cr`: Carriage return (for Microsoft-style line endings)
- `eol`: `\n` characters
- `space`: Leading and trailing space characters
- `preferredLineLength`: Identifies the length of a line (defaults to `80`)
- `showInvisibles`: Whether to render placeholders for invisible characters (defaults to `false`)
- `fuzzyFinder`
- `ignoredNames`: Files to ignore *only* in the fuzzy-finder
- `whitespace`
- `ensureSingleTrailingNewline`: Whether to reduce multiple newlines to one at the end of files
- `wrapGuide`
- `columns`: Array of hashes with a `pattern` and `column` key to match the
the path of the current editor to a column position.
## Customizing Key Bindings
Atom keymaps work similarly to stylesheets. Just as stylesheets use selectors
to apply styles to elements, Atom keymaps use selectors to associate keystrokes
with events in specific contexts. Here's a small example, excerpted from Atom's
built-in keymaps:
```coffee-script
'.editor':
'enter': 'editor:newline'
".select-list .editor.mini":
'enter': 'core:confirm',
```
This keymap defines the meaning of `enter` in two different contexts. In a
normal editor, pressing `enter` emits the `editor:newline` event, which causes
the editor to insert a newline. But if the same keystroke occurs inside of a
select list's mini-editor, it instead emits the `core:confirm` event based on
the binding in the more-specific selector.
By default, any keymap files in your `~/.atom/keymaps` directory are loaded
in alphabetical order when Atom is started. They will always be loaded last,
giving you the chance to override bindings that are defined by Atom's core
keymaps or third-party packages.
## Changing The Theme
Atom comes bundled 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"]
```
You install new themes by placing them in the _~/.atom/themes_ directory. A
theme can be a CSS file, a directory containing multiple CSS files, or a
TextMate theme (either _.tmTheme_ or _.plist_).
## Installing Packages (Partially Implemented)
To install a package, clone it into the _~/.atom/packages_ directory. Atom will
also load grammars and snippets from TextMate bundles. If you want to disable a
package without removing it from the packages directory, insert its name into
_config.core.disabledPackages_:
```coffeescript
core:
disabledPackages: [
"fuzzy-finder",
"tree-view"
]
```
## Quick Personal Hacks
### user.coffee
When Atom finishes loading, it will evaluate _user.coffee_ in your _~/.atom_
directory, giving you a chance to run arbitrary personal CoffeeScript code to
make customizations. You have full access to Atom's API from code in this file.
Please refer to the [Atom Internals Guide](./internals/intro,md) for more information. If your
customizations become extensive, consider [creating a package](./packages/creating_packages.md).
### user.css
If you want to apply quick-and-dirty personal styling changes without creating
an entire theme that you intend to distribute, you can add styles to
_user.css_ in your _~/.atom_ directory.
For example, to change the color of the highlighted line number for the line that
contains the cursor, you could add the following style to _user.css_:
```css
.editor .line-number.cursor-line {
color: pink;
}
```

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# Getting Started
Welcome to Atom. This documentation is intended to offer a basic introduction
of how to get productive with this editor. Then we'll delve into more details
about configuring, theming, and extending Atom.
Welcome to Atom. This documentation provides a basic introduction to being
productive with this editor. We'll then delve into more details about configuring,
theming, and extending Atom.
## The Command Palette
If there's one key-command you learn in Atom, it should be `meta-p` (`meta` is
If there's one key-command you must remember in Atom, it should be `meta-p` (`meta` is
synonymous with the ⌘ key). You can always hit `meta-p` to bring up a list of
commands that are relevant to the currently focused UI element. If there is a
key binding for a given command, it is also displayed. This is a great way to
explore the system and get to know the key commands interactively. If you'd like
to add or change a binding for a command, refer to the [key
bindings](#customizing-key-bindings) section to learn how.
to learn about adding or changing a binding for a command, refer to the [key
bindings](#customizing-key-bindings) section.
![Command Palette](http://f.cl.ly/items/32041o3w471F3C0F0V2O/Screen%20Shot%202013-02-13%20at%207.27.41%20PM.png)
## Basic Key Bindings
Remember you can always use `meta-p` to explore available commands and their
You can always use `meta-p` to explore available commands and their
bindings, but here's a list of a few useful commands.
- `meta-o` : open file/directory
- `meta-n` : new window
- `meta-o` : open a file or directory
- `meta-n` : open new window
- `meta-r` : reload the current window
- `meta-alt-ctrl-s` : run specs
- `meta-t` : open fuzzy file finder
- `meta-alt-ctrl-s` : run test specs
- `meta-t` : open file finder to navigate files in your project
- `meta-;` : open command prompt
- `meta-f` : open command prompt with `/`
- `meta-f` : open command prompt with `/` for a local file search
- `meta-g` : repeat the last local search
- `meta-shift-f` : open command prompt with `Xx/` for a project-wide search
- `meta-\` : focus/open tree view, or close it when it is focused
@ -52,8 +53,8 @@ issue so you can keep working.
The fastest way to find a file in your project is to use the fuzzy finder. Just
hit `meta-t` and start typing the name of the file you're looking for. If you
already have the file open and want to jump to it, hit `meta-b` to bring up a
searchable list of open buffers.
already have the file open as a tab and want to jump to it, hit `meta-b` to bring
up a searchable list of open buffers.
You can also use the tree view to navigate to a file. To open or move focus to
the tree view, hit `meta-\`. You can then navigate to a file and select it with
@ -73,28 +74,32 @@ To delete a file, select it in the tree view and hit `delete`.
#### Using the Command Line
Atom has a command line similar to editors Emacs and Vim, which is currently the
only interface for performing searches. Hitting `meta-f` will open the command
line prepopulated with the `/` command, which finds forward in the current
buffer from the location of the cursor. Pressing `meta-g` will repeat the
search. Hitting `meta-shift-f` will open the command line prepopulated with
`Xx/`, which is a composite command that performs a global search. The results
of the search will appear in the operation preview list, which you can focus
Atom has a command line similar to old-school editors such as emacs and vim. Nearly
every command has a key binding which you can discover with `meta-p`.
The command line is also (currently) the only place you can perform a search. Hitting
`meta-f` opens the command line and prepopulates it with the `/` command. This finds
text in the current buffer, starting at the location of the cursor. Pressing `meta-g`
repeats the search. Hitting `meta-shift-f` opens the command line and prepopulates
it with `Xx/`, which is a composite command that performs a global search. The results
of the search appear in the operation preview list, which you can focus
with `meta-:`.
Atom's command language is still under construction and is loosely based on
Atom's command language is still under construction, and is loosely based on
the [Sam editor](http://doc.cat-v.org/bell_labs/sam_lang_tutorial/) from the
Plan 9 operating system. It's similar to Ex mode in Vim, but is selection-based
Plan 9 operating system. It's similar to Ex mode in vim, but is selection-based
rather than line-based. It allows you to compose commands together in
interesting ways.
#### Navigating By Symbols
If you want to jump to a method, you can use the ctags-based symbols package.
The `meta-j` binding will open a list of all symbols in the current file. The
`meta-shift-j` binding will open a list of all symbols for the current project
based on a tags file. And `meta-.` will jump to the tag for the word currently
under the cursor. Make sure you have a tags file generated for the project for
The `meta-j` binding opens a list of all symbols in the current file. The
`meta-shift-j` binding opens a list of all symbols for the current project
based on a tags file. `meta-.` jumps to the tag for the word currently
under the cursor.
Make sure you have a tags file generated for the project for
the latter of these two bindings to work. Also, if you're editing CoffeeScript,
it's a good idea to update your `~/.ctags` file to understand the language. Here
is [a good example](https://github.com/kevinsawicki/dotfiles/blob/master/.ctags).
@ -106,8 +111,8 @@ command, as follows: `s/foo/bar/g`. Note that if you have a selection, the
replacement will only occur inside the selected text. An empty selection will
cause the replacement to occur across the whole buffer. If you want to run the
command on the whole buffer even if you have a selection, precede your
substitution with the `,` address, which specifies that the command following it
operate on the whole buffer.
substitution with the `,` address; this indicates that the following command should
run on the whole buffer.
### Split Panes
@ -125,12 +130,12 @@ planning to improve it soon.
### Soft-Wrap
If you want to toggle soft wrap, trigger the command from the command palette.
Press `meta-p` to open the palette, then type "wrap" to find the correct
Hit `meta-p` to open the palette, then type "wrap" to find the correct
command.
## Your .atom Directory
When you install Atom, a `.atom` directory is created in your home directory.
When you install Atom, an `.atom` directory is created in your home directory.
If you press `meta-,`, that directory will be opened in a new window. For the
time being, this will serve as the primary interface for adjusting configuration
settings, adding and changing key bindings, tweaking styles, etc.

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getting-started.md
configuring-atom.md
built-in-packages/intro.md
built-in-packages/command-panel.md
built-in-packages/markdown-preview.md
built-in-packages/wrap-guide.md
authoring-themes.md
authoring-packages..md
packages/authoring-packages.md
themes/authoring-themes.md
internals/intro.md
internals/configuration.md
internals/keymaps.md

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# Authoring Packages
Packages are at the core of Atom. Nearly everything outside of the main editor manipulation
is handled by a package. That includes "core" pieces like the command panel, status bar,
file tree, and more.
A package can contain a variety of different resource types to change Atom's
behavior. The basic package layout is as follows (though not every package will
have all of these directories):
```text
my-package/
lib/
stylesheets/
keymaps/
snippets/
grammars/
spec/
package.json
index.coffee
```
**NOTE:** NPM behavior is partially implemented until we get a working Node.js
API built into Atom. The goal is to make Atom packages be a superset of NPM
packages.
Below, we'll break down each directory. There's also [a tutorial](./creating_a_package.md)
on creating your first package.
## package.json
Similar to [npm packages](http://en.wikipedia.org/wiki/Npm_(software)), Atom packages
can contain a _package.json_ file in their top-level directory. This file contains metadata
about the package, such as the path to its "main" module, library dependencies,
and manifests specifying the order in which its resources should be loaded.
In addition to the regular [npm package.json keys](https://npmjs.org/doc/json.html)
available, Atom package.json files [have their own additions](./package_json.md).
## Source Code
If you want to extend Atom's behavior, your package should contain a single
top-level module, which you export from `index.coffee` (or whichever file is
indicated by the `main` key in your `package.json` file). The remainder of your
code should be placed in the `lib` directory, and required from your top-level
file.
Your package's top-level module is a singleton object that manages the lifecycle
of your extensions to Atom. Even if your package creates ten different views and
appends them to different parts of the DOM, it's all managed from your top-level
object.
Your package's top-level module should implement the following methods:
- `activate(rootView, state)`: This **required** method is called when your
package is loaded. It is always passed the window's global `rootView`, and is
sometimes passed state data if the window has been reloaded and your module
implements the `serialize` method. Use this to do initialization work when your
package is started (like setting up DOM elements or binding events).
- `serialize()`: This **optional** method is called when the window is shutting
down, allowing you to return JSON to represent the state of your component. When
the window is later restored, the data you returned is passed to your
module's `activate` method so you can restore your view to where the user left
off.
- `deactivate()`: This **optional** method is called when the window is shutting
down. If your package is watching any files or holding external resources in any
other way, release them here. If you're just subscribing to things on window,
you don't need to worry because that's getting torn down anyway.
### Simple Package Code
```text
my-package/
package.json # optional
index.coffee
lib/
my-package.coffee
```
`index.coffee`:
```coffeescript
module.exports = require "./lib/my-package"
```
`my-package/my-package.coffee`:
```coffeescript
module.exports =
activate: (rootView, state) -> # ...
deactivate: -> # ...
serialize: -> # ...
```
Beyond this simple contract, your package has full access to Atom's internal
API. Anything we call internally, you can call as well. Be aware that since we
are early in development, APIs are subject to change and we have not yet
established clear boundaries between what is public and what is private. Also,
please collaborate with us if you need an API that doesn't exist. Our goal is
to build out Atom's API organically based on the needs of package authors like
you.
See [Atom's built-in packages](https://github.com/github/atom/tree/master/src/packages)
for examples of Atom's API in action.
## Stylesheets
Stylesheets for your package should be placed in the `stylesheets` directory.
Any stylesheets in this directory will be loaded and attached to the DOM when
your package is activated. Stylesheets can be written as CSS or LESS.
An optional `stylesheets` array in your `package.json` can list the stylesheets by
name to specify a loading order; otherwise, stylesheets are loaded alphabetically.
## Keymaps
Keymaps are placed in the `keymaps` subdirectory. It's a good idea to provide
default keymaps for your extension, especially if you're also adding a new command.
By default, all keymaps are loaded in alphabetical order. An optional `keymaps`
array in your `package.json` can specify which keymaps to load and in what order.
See the [main keymaps documentation](../internals/keymaps.md) for more information on
how keymaps work.
## Snippets
An extension can supply language snippets in the `snippets` directory. These can
be `.cson` or `.json` files. Here's an example:
```coffeescript
".source.coffee .specs":
"Expect":
prefix: "ex"
body: "expect($1).to$2"
"Describe":
prefix: "de"
body: """
describe "${1:description}", ->
${2:body}
"""
```
A snippets file contains scope selectors at its top level (`.source.coffee .spec`).
Each scope selector contains a hash of snippets keyed by their name (`Expect`, `Describe`).
Each snippet also specifies a `prefix` and a `body` key. The `prefix` represents
the first few letters to type before hitting the `tab` key to autocomplete. The
`body` defines the autofilled text. You can use placeholders like `$1`, `$2`, to indicate
regions in the body the user can navigate to every time they hit `tab`.
All files in the directory are automatically loaded, unless the
`package.json` supplies a `snippets` key. As with all scoped
items, snippets loaded later take precedence over earlier snippets when two
snippets match a scope with the same specificity.

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@ -9,9 +9,9 @@ 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.
The most basic theme is just a `.css` file. More complex themes occupy their own
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:
_package.cson_ file containing a manifest to control their load-order:
```text
~/.atom/themes/

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@ -0,0 +1,5 @@
# package.json format
stylesheets
keymaps
snippets