• Packages
• Themes
• Documentation
• Blog
• Discussions

Chapter 1: Getting Started

• Why Atom?
• Installing Atom
• Atom Basics
• Summary

Chapter 2: Using Atom

• Atom Packages
• Moving in Atom
• Atom Selections
• Editing and Deleting Text
• Find and Replace
• Snippets
• Autocomplete
• Folding
• Panes
• Pending Pane Items
• Grammar
• Version Control in Atom
• GitHub package
• Writing in Atom
• Basic Customization
• Summary

Chapter 3: Hacking Atom

• Tools of the Trade
• The Init File
• Package: Word Count
• Package: Modifying Text
• Package: Active Editor Info
• Creating a Theme
• Creating a Grammar
• Creating a Legacy TextMate Grammar
• Publishing
• Iconography
• Debugging
• Writing specs
• Handling URIs
• Cross-Platform Compatibility
• Converting from TextMate
• Hacking on Atom Core
• Contributing to Official Atom Packages
• Creating a Fork of a Core Package in atom/atom
• Maintaining a Fork of a Core Package in atom/atom
• Summary

Chapter 4: Behind Atom

• Configuration API
• Keymaps In-Depth
• Scoped Settings, Scopes and Scope Descriptors
• Serialization in Atom
• Developing Node Modules
• Interacting With Other Packages Via Services
• Maintaining Your Packages
• How Atom Uses Chromium Snapshots
• Summary

Reference: API

• AtomEnvironment
• BufferedNodeProcess
• BufferedProcess
• Clipboard
• Color
• CommandRegistry
• CompositeDisposable
• Config
• ContextMenuManager
• Cursor
• Decoration
• DeserializerManager
• Directory
• DisplayMarker
• DisplayMarkerLayer
• Disposable
• Dock
• Emitter
• File
• GitRepository
• Grammar
• GrammarRegistry
• Gutter
• HistoryManager
• KeymapManager
• LayerDecoration
• MarkerLayer
• MenuManager
• Notification
• NotificationManager
• Package
• PackageManager
• Pane
• Panel
• PathWatcher
• Point
• Project
• Range
• ScopeDescriptor
• Selection
• StyleManager
• Task
• TextBuffer
• TextEditor
• ThemeManager
• TooltipManager
• ViewRegistry
• Workspace
• WorkspaceCenter

Appendix A: Resources

• Glossary

Appendix B: FAQ

• Is Atom open source?
• What does Atom cost?
• What platforms does Atom run on?
• How can I contribute to Atom?
• Why does Atom collect usage data?
• Atom in the cloud?
• What's the difference between an IDE and an editor?
• How can I tell if subpixel antialiasing is working?
• Why is Atom deleting trailing whitespace? Why is there a newline at the end of the file?
• What does Safe Mode do?
• I have a question about a specific Atom community package. Where is the best place to ask it?
• I’m using an international keyboard and keys that use AltGr or Ctrl+Alt aren’t working
• I’m having a problem with Julia! What do I do?
• I’m getting an error about a “self-signed certificate”. What do I do?
• I’m having a problem with PlatformIO! What do I do?
• How do I make Atom recognize a file with extension X as language Y?
• How do I make the Welcome screen stop showing up?
• How do I preview web page changes automatically?
• How do I accept input from my program or script when using the script package?
• I am unable to update to the latest version of Atom on macOS. How do I fix this?
• I’m trying to change my syntax colors from styles.less, but it isn’t working!
• How do I build or execute code I've written in Atom?
• How do I uninstall Atom on macOS?
• macOS Mojave font rendering change
• Why does macOS say that Atom wants to access my calendar, contacts, photos, etc.?
• How do I turn on line wrap?
• The menu bar disappeared, how do I get it back?
• How do I use a newline in the result of find and replace?
• What is this line on the right in the editor view?

Appendix C: Shadow DOM

• Removing Shadow DOM styles

Appendix D: Upgrading to 1.0 APIs

• Upgrading Your Package
• Upgrading Your UI Theme Or Package Selectors
• Upgrading Your Syntax Theme

Appendix E: Atom server-side APIs

• Atom package server API
• Atom update server API

Shadow DOM

In Atom 1.13 the Shadow DOM got removed from text editors. Find a guide how to migrate your theme or package in this appendix.

Sections

• Removing Shadow DOM styles