A technical skill for encapsulating requests as objects to enable reversible operations, command queuing, and decoupled software architectures.
Install & Download
1. ClawHub CLI
The fastest way to install a skill directly from the registry.
npx clawhub@latest install bookforge-command-pattern-implementor
2. Manual Installation
Copy the skill folder to one of these locations
~/.openclaw/skills/ <project>/skills/ Priority: Workspace > Local > Bundled
3. Prompt Installation
Copy this prompt to OpenClaw to install it automatically.
Help me install bookforge-command-pattern-implementor using Clawhub. If Clawhub is not installed, install it first (npm i -g clawhub).
Prefer to download?
Get the raw skill files in a ZIP archive.
What is Command Pattern Implementor?
The command-pattern-implementor is a robust utility within the Openclaw Skills library designed to assist developers in applying the Gang of Four behavioral Command pattern. It provides a structured approach to turning operations into standalone objects, which is essential for building sophisticated user interfaces that require modularity and complex action management. By using this tool, developers can easily separate the objects that trigger requests from the objects that perform the actual business logic.
This specific implementation focuses on creating a reliable state machine for multi-level undo and redo functionality. By leveraging Openclaw Skills, you can automate the generation of command interfaces, concrete command classes, and history management systems that maintain high fidelity during state transitions. This leads to cleaner codebases where UI components like buttons and menu items remain agnostic of the underlying system services they invoke.
Command Pattern Implementor Use Cases
- Creating multi-level undo and redo systems for document editors or design tools.
- Decoupling UI elements like menu items and toolbar buttons from their execution logic.
- Implementing macro recording features where a sequence of actions is stored and replayed as a single unit.
- Developing transaction-based systems where operations must be logged for crash recovery or auditing.
- Building command queues for asynchronous task execution or request scheduling.
How Command Pattern Implementor Works
- Identify the core participants including the Invoker (UI elements), Receiver (logic objects), and the Command interface.
- Define a standard Command interface that includes Execute() and optionally Unexecute() and Reversible() methods.
- Implement ConcreteCommand classes that store the receiver reference and any state required to reverse the action.
- Initialize a CommandHistory manager containing a list of commands and a present-line pointer for navigation.
- Use the Client to wire specific command instances to UI invokers during application setup.
- Execute commands through the history manager to ensure they are tracked for potential undo or redo operations.
- Truncate the redo branch whenever a new command is executed following an undo action to maintain a linear history.
Command Pattern Implementor Setup
To integrate this capability into your project using the Openclaw Skills ecosystem, follow these steps:
clawhub install bookforge-behavioral-pattern-selector
Ensure your codebase follows a clear separation between the UI layer (Invokers) and the domain layer (Receivers). You will need to define a base Command interface or abstract class in your preferred programming language before generating concrete implementations.
Command Pattern Implementor Data Schema & Taxonomy
The command-pattern-implementor organizes data based on the following structural taxonomy:
| Component | Responsibility | Data Elements |
|---|---|---|
| Command Interface | Protocol definition | Method signatures for Execute and Unexecute |
| ConcreteCommand | Operation encapsulation | Receiver reference, parameters, and pre-execution state |
| CommandHistory | State navigation | Ordered list of commands and an integer index pointer |
| MacroCommand | Composite management | List of child Command objects for batch execution |
Command Pattern Implementor Advanced Features
- Multi-level Undo/Redo: Supports infinite navigation through command history with present-line pointer logic.
- Macro Recording: Enables composite operations by nesting multiple commands within a MacroCommand with reverse-order unexecution.
- Smart History Management: Includes the Reversible() predicate to prevent no-op actions from cluttering the undo stack.
- SimpleCommand Templates: Provides lightweight alternatives for simple operations that do not require stateful undo logic.
- State Fidelity: Recommends the Memento pattern integration for commands requiring complex state snapshots rather than computed reversals.
SKILL.md
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