awesome-code-change

A curated list of automated code change tools and projects. Search and replace, mass refactoring, codemods, and more

Write code to change code

Generic

• comby - a tool for searching and changing code structure. It's aware of syntax elements such as code blocks, strings and comments.
• facebookarchive/codemod (archived) - a tool/library to assist you with large-scale codebase refactors that can be partially automated but still require human oversight and occasional intervention. Regex syntax. The are many language or framework-specific tools based off codemod, see rajasegar/awesome-codemods.
• facebookincubator/fastmod a fast partial replacement for codemod, focused on the interactive mode.
• yelp/undebt (archived) - a tool that lets you define complex find-and-replace rules using standard, straightforward Python that can be applied quickly to an entire code base with a simple command.

golang

• astutil - common utilities to work with golang's AST
• uber-go/gopatch - a tool to match and transform Go code. It is meant to aid in refactoring and restyling.
• rf - experimental refactoring tool for go

Java

• openrewrite/rewrite - Semantic code search and transformation for Java.

js

• facebook/jscodeshift - a JavaScript codemod toolkit.

python

• google/pasta - a library to refactor python code through AST manipulation.
• facebookincubator/Bowler - AST-level refactoring for python, guarantees that the resulting code compiles and runs.
• python-rope/rope - a python refactoring library
• Instagram/LibCST - a concrete syntax-tree parser for python

rust

• google/rerast - a search/replace tool for Rust code using rules.

Scala

• scalacenter/scalafix - a refactoring and linting tool for Scala

IDEs

• IntelliJ - has a lot of helpful refactoring functionalities
• Eclipse - the Eclipse JDT provides AST manipulation tools

Apply changes across many repositories

• Sourcegraph Batch Changes - apply and track code changes across many repositories and code hosts
• gruntwork-io/git-xargs - a command-line tool (CLI) for making updates across multiple Github repositories with a single command
• Skyscanner/turbolift - a simple tool to help apply changes across many GitHub repositories simultaneously
• gabor-boros/hammurabi - an extensible CLI tool responsible for enforcing user-defined rules on code