corefactorer

co-refactorer

Refactoring your code with GenAI.

NOTE: This is a prototype and not ready for production use. Use at your own risk.

Prerequisites

• OpenAI API key
• Go 1.23 or later
• Make
• (optional) GitHub Personal Access Token
  • If you want to use co-refactorer for private repository, you need to set GITHUB_TOKEN environment variable.

Obtain OpenAI API key

• Go to the following URL
  • https://platform.openai.com/organization/api-keys
• Create new secret key
• Then, copy the key and set it to OPENAI_API_KEY environment variable when using co-refactorer command.

Obtain GitHub Personal Access Token

• Go to the following URL
  • https://github.com/settings/tokens?type=beta
  • Settings -> Developer settings -> Personal access tokens -> Fine-grained tokens
• Generate new token with following permissions
  • Pull requests: Read-only
  • Metadata: Read-only
• Then, copy the token and set it to GITHUB_TOKEN environment variable when using co-refactorer command.

Build

make build

Run

You can run co-refactorer in two ways:

• Use binary: ./bin/co-refactorer
• Use go run command: go run ./cmd/co-refactorer/main.go

First, prepare prompt to refactor your code for GenAI. co-refactorer requires a pull-request URL to refer and paths of target files in your machine to be refactored.

Here is an example of prompt file.

cat example/prompt1.txt

You are an expert Go programmer. Please refactor the following files to use a map[string]struct{...} format instead of []struct{ name string ...} using Table Driven Test as a reference from this PR (https://github.com/oinume/co-refactorer/pull/9)

refactoring_request_test.go

Then, run co-refactorer with the prompt.

OPENAI_API_KEY='<YourAPIKey>' ./bin/co-refactorer < example/prompt1.txt

Then, co-refactorer will overwrite the target files with refactored code. After that, you may make a pull-request with the refactored file.

More examples

Specifying GenAI model

You can specify GenAI model with -model option like below. The default model is gpt-4o-mini.

OPENAI_API_KEY='<YourAPIKey>' ./bin/co-refactorer -model=gpt-4o < example/prompt1.txt

Specifying temperature

You can specify temperature with -temperature option like below.

OPENAI_API_KEY='<YourAPIKey>' ./bin/co-refactorer -temperature=0.1 < example/prompt1.txt