Cedardiff

Edit files using CEDARScript, a SQL-like language for code manipulation.

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cedardiff MCP Server

Edit files with CEDARScript grammar rules

This is a TypeScript-based MCP server that implements CEDARScript, a SQL-like language for code manipulation. It provides:

  • A comprehensive grammar for code manipulation commands
  • Tools for executing CEDARScript operations
  • Support for complex pattern matching and transformations

Features

Grammar

  • SQL-like syntax for code operations (DDL, DML)
  • Support for file, function, class, and method targeting
  • Pattern matching with regex, prefix/suffix, and indentation rules
  • Block-level code manipulation capabilities

Tools

  • edit_file - Execute CEDARScript commands
    • Takes script and working directory as parameters
    • Supports file creation, deletion, moving, and updating
    • Pattern-based code transformations

Implementation Status

Current testing has revealed:

  • Command parsing works correctly
  • Grammar supports complex operations
  • File writing mechanism needs improvement
  • Success messages returned but changes not persisted

Development

Install dependencies:

npm install

Build the server:

npm run build

For development with auto-rebuild:

npm run watch

Installation

To use with Claude Desktop, add the server config:

On MacOS: ~/Library/Application Support/Claude/claude_desktop_config.json On Windows: %APPDATA%/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "cedardiff": {
      "command": "/path/to/cedardiff/build/index.js"
    }
  }
}

Debugging

Since MCP servers communicate over stdio, debugging can be challenging. We recommend using the MCP Inspector, which is available as a package script:

npm run inspector

The Inspector will provide a URL to access debugging tools in your browser.

ES Module Migration

The project has been migrated to use ES modules. Key changes include:

  • Added "type": "module" to package.json
  • Updated tsconfig.json to use "module": "ESNext"
  • Converted import/export statements to ES module syntax
  • Updated type definitions to be compatible with ES modules

Compatibility Notes

  • Ensure you are using Node.js version 12 or higher
  • Use import instead of require() for module imports
  • Use .js extension when importing local files

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