emacs-evil/evil
Evil
Evil is a modal editing framework and state-machine layer for the Emacs text editor. It functions as a modal text editing layer that separates text entry from navigation and manipulation by routing intercepted keystrokes through a central command dispatching system.
The project serves as a Vim keybinding emulator, mapping standard modal editing commands and keyboard shortcuts into the Emacs environment. It utilizes an operator-motion command engine to compose atomic movement and action inputs into complex grammatical editing operations.
The framework covers keyboard-driven navigation and text editor customization. It includes a system for modal keybinding configuration and a custom extension framework for defining unique logic and commands.
Features
- Vim Keybinding Emulations - Implements a comprehensive mapping of Vim modal commands and shortcuts within the Emacs environment.
- Vim Emulation Layers - Implements a complete modal interaction system that mimics Vim's motions and operators within Emacs.
- Grammatical Command Composition - Constructs complex editing operations by buffering atomic movement and action inputs.
- Grammatical Command Engines - Composes atomic movement and action inputs into complex grammatical editing operations.
- Editor Input Interception - Hooks into the Emacs event cycle to intercept raw input for transformation into modal commands.
- Layered Keymaps - Provides layered keymaps that override default editor behaviors based on the active modal state.
- Modal Editing Frameworks - Provides a state-machine layer for Emacs that enables Vim-style navigation and editing workflows.
- Modal Editing Layers - Functions as a configuration layer that transforms the editor into a state-machine-driven modal environment.
- Modal Keybinding Engines - Employs a state-machine engine to map key sequences to configurable action handlers across different modes.
- Keyboard-Driven Code Navigation - Enables high-speed cursor movement and complex edits using text objects and character sequences.
- Modal Editing Systems - Implements an input scheme that separates navigation and manipulation from text entry via distinct modes.
- Operator Motion Repetition - Combines text operators with navigation jumps to execute complex modal editing sequences.
- Modal Editing Modes - Implements high-level modal editing behaviors that change how keys trigger commands.
- Vi Modal Editing - Implements the modal paradigm of separating text entry from navigation and manipulation.
- Message Loop Hooks - Injects callback functions into the editor's message loop to capture and transform input sequences.
- Input Mode State Machines - Uses a deterministic state machine to manage transitions between different input modes via keystrokes.
- Text Object Parsing - Identifies structural units like words and paragraphs using regex for targeted text manipulation.
- Buffer-Local Settings - Implements a mechanism for storing modal state and configurations that apply specifically to the current active editor buffer.
- General Editor Behavior Customizations - Provides APIs for modifying the runtime behavior and functional key mappings of the editor.
- Extensibility Frameworks - Provides an architectural framework for users to define custom logic and extend the modal editing layer.
