Diffuse - Github Action

Simple Github Action wrapper for Jake Wharton's Diffuse tool.

Usage

The action only exposes output containing the diff, so to effectively consume its output it is highly recommended to use other Github Actions to customize your experience.

Configuration:

By default, this action uses Diffuse fork - https://github.com/usefulness/diffuse (due to: JakeWharton/diffuse#111)

  - id: diffuse
    uses: usefulness/diffuse-action@v1
    with:
      old-file-path: old/file/path/old_file.apk
      new-file-path: new/file/path/new_file.apk

You can override the config to use the original Diffuse binary

  - id: diffuse
    uses: usefulness/diffuse-action@v1
    with:
      old-file-path: old/file/path/old_file.apk
      new-file-path: new/file/path/new_file.apk
      diffuse-repo: JakeWharton/diffuse
      lib-version: 0.1.0

Parameters

old-file-path - Path to reference file the diff should be generated for
new-file-path - Path to current file the diff should be generated for
lib-version (Optional) - Overrides dependency version, by default uses the latest published version
diffuse-repo (Optional) - Overrides usefulness/diffuse as the default repository containing published release artifacts.

Outputs

See full list of outputs.
For example: referencing steps.diffuse.outputs.diff-gh-comment at a later stage will print Diffuse tool output as a nicely formatted github comment

Sample: Create Pull Request comment

TODO: explain why to use free actions/cache for now and list its limitation.
Good introduction to the problem: JakeWharton/dependency-tree-diff#8 (comment)

1. Integrate with a regular Pull Request workflow:

name: Pull Request workflow

on:
  pull_request:

jobs:
  generate-diff:
    runs-on: ubuntu-latest
    
    steps:
    - uses: actions/checkout@v2
    
    - uses: actions/setup-java@v3
      with:
        distribution: 'temurin'
        java-version: 21
      
    - uses: gradle/actions/setup-gradle@v3
      with:
        arguments: assemble

    # Generating the diff starts here 👇 

    - uses: actions/cache@v2
      name: Download base
      with:
        path: diffuse-source-file
        key: diffuse-${{ github.event.pull_request.base.sha }}

    - id: diffuse
      uses: usefulness/diffuse-action@v1
      with:
        old-file-path: diffuse-source-file
        new-file-path: app/build/outputs/release/app.apk


    # Consuming action output starts here 👇

    - uses: peter-evans/find-comment@v1
      id: find_comment
      with:
        issue-number: ${{ github.event.pull_request.number }}
        body-includes: Diffuse output

    - uses: peter-evans/create-or-update-comment@v1
      if: ${{ steps.diffuse.outputs.diff-raw != null || steps.find_comment.outputs.comment-id != null }}
      with:
        body: |
          Diffuse output (customize your message here): 

          ${{ steps.diffuse.outputs.diff-gh-comment }}
        edit-mode: replace
        comment-id: ${{ steps.find_comment.outputs.comment-id }}
        issue-number: ${{ github.event.pull_request.number }}
        token: ${{ secrets.GITHUB_TOKEN }}

    - uses: actions/upload-artifact@v2
      with:
        name: diffuse-output
        path: ${{ steps.diffuse.outputs.diff-file }}

2. Integrate with you post-merge flow:

on:
  push:
    branches:
      - master
      - main
      - trunk
      - develop
      - maine
      - mane
  schedule:
    - cron: '0 3 * * 1,4'

jobs:
  diffuse_cache:
    runs-on: ubuntu-latest
    name: Cache artifact for diffuse
    steps:
      - uses: actions/checkout@v2
      
      - uses: actions/setup-java@v3
        with:
          distribution: 'temurin'
          java-version: 21
          
      - uses: gradle/actions/setup-gradle@v3
        with:
          arguments: assemble

      # Integration starts here 👇 
      
      - uses: actions/cache@v2
        name: Upload base
        with:
          path: diffuse-source-file
          key: diffuse-${{ github.sha }}

      # Copy your build artifact under `diffuse-source-file` name which will be saved in cache
      - run: cp /app/build/outputs/debug/sample-apk.apk diffuse-source-file 
        shell: bash

More examples

Sample application as a pull request comment
Corresponding workflow file

🙏 Praise 🙏 be 🙏 to 🙏 Wharton 🙏