Apply structural codemods across large codebases with Comby

Rewrite recurring code patterns with syntax-aware matching so agents can run migration codemods more safely than plain regex search and replace.

Prerequisites

Comby CLI

Installation

Use the upstream install or setup path that matches your environment:

• docker run -a stdin -a stdout -a stderr -i comby/comby '(:[emoji] hi)' 'bye :[emoji]' lisp -stdin <<< '(👋 hi)'
• git clone https://github.com/comby-tools/comby
• make
• make test

Requirements and caveats from upstream:

• Docker

• docker pull comby/comby
• <summary>click to expand an example invocation for the docker image</summary>

Basic usage or getting-started notes:

• See the usage documentation.

• A short example below shows how comby simplifies matching and rewriting compared to regex approaches like sed.

• Mac OS X

• Source: https://github.com/comby-tools/comby

• Extracted from upstream docs: https://raw.githubusercontent.com/comby-tools/comby/HEAD/README.md

Documentation

• https://comby.dev/

Source

• Agent Skill Exchange