diffctx = diff context

A GitHub action for automatically evaluating the logic level impacts of Pull Requests.

Showcase

With a simple setup in your GitHub Action:

- name: diffctx
  uses: williamfzc/diffctx@v0.3.13
  with:
    lang: "golang"

Diffctx will automatically analyse the diff (and the context of diff) every new PullRequests in your repo, and leave comments for indicating which part you should care most:

williamfzc/srctx#52

Based on LSIF, diffctx will not only analyse the lines contained by the diff, but also the full scope of your repo, and understand it well.

Usage

diffctx can be directly used with GitHub Action.

Add to GitHub Action

name: Test PR

# triggered by pull_request
on: [ push, pull_request ]

# for creating comments
permissions:
  pull-requests: write

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
        with:
          # at least
          fetch-depth: 2

      # ...

      - name: diffctx
        uses: williamfzc/diffctx@v0.3.13
        with:
          # see the `Supported Langs` for details
          lang: "golang"

Done!

You can create a new PullRequest for test.

Or test it with a push. You can find it in actions log.

Supported Languages

Overview

Language	Ready?	Keyword in yaml	Real-world Sample
Golang	✅	golang	ci.yml
Java	✅	java	main.yml
Kotlin	✅🚧	kotlin	build.yml
NodeJs	✅	node	build.yml
Python	✅	python	run-test.yml

Want more langs?

Thanks to tree-sitter and LSIF, diffctx can support nearly all the popular languages.

https://lsif.dev/

Adding a new language support is not hard. PullRequests are always welcome!

How it works

1. Scan the repo and understand it well
2. Extract the sub graph influenced by the diff
3. Generate a summary from sub graph
4. Create a comment

Contribution

Issues, PRs and suggestions are always welcome.

• diffctx: for the whole workflow
• srctx: the core analyzer

Roadmap

• More languages
• Better comment format
• Extract more meaningful columns (like function definition) from code
• Display graph in comment also