http://simonwillison.net/2023-12-10T19:56:10+00:00Simon Willison2023-12-10T19:56:10+00:002023-12-10T19:56:10+00:00https://simonwillison.net/2023/Dec/10/ast-grep/#atom-tag

<p><strong><a href="https://ast-grep.github.io/">ast-grep</a></strong></p> There are a lot of interesting things about this year-old project.</p> <p>sg (an alias for ast-grep) is a CLI tool for running AST-based searches against code, built in Rust on top of the Tree-sitter parsing library. You can run commands like this:</p> <p>sg -p ’await await_me_maybe($ARG)’ datasette --lang python</p> <p>To search the datasette directory for code that matches the search pattern, in a syntax-aware way.</p> <p>It works across 19 different languages, and can handle search-and-replace too, so it can work as a powerful syntax-aware refactoring tool.</p> <p>My favourite detail is how it’s packaged. You can install the CLI utility using Homebrew, Cargo, npm or pip/pipx—each of which will give you a CLI tool you can start running. On top of that it provides API bindings for Rust, JavaScript and Python! <p><small></small>Via <a href="https://news.ycombinator.com/item?id=38590984">Hacker News</a></small></p> <p>Tags: <a href="https://simonwillison.net/tags/cli">cli</a>, <a href="https://simonwillison.net/tags/javascript">javascript</a>, <a href="https://simonwillison.net/tags/python">python</a>, <a href="https://simonwillison.net/tags/search">search</a>, <a href="https://simonwillison.net/tags/tools">tools</a>, <a href="https://simonwillison.net/tags/rust">rust</a>, <a href="https://simonwillison.net/tags/treesitter">treesitter</a></p>