action.yml

name: Code Review Github Action
author: Frank Chen (@fxchen)
description: 'Improve your pull requests and code base with AI-assisted code reviews'
inputs:
  github-token:
    description: 'The token used to authenticate with the GitHub API'
    required: false
    default: ${{ github.token }}
  api-to-use:
    description: 'The API to use for code review (openai, claude)'
    required: false
    default: 'openai'
  openai-key:
    description: 'The OpenAI API key'
    required: true
  anthropic-key:
    description: 'The Anthropic (Claude) API key'
    required: false
  model: 
    description: 'The OpenAI or Anthropic language model to use for code review'
    required: false
    default: 'gpt-3.5-turbo-16k'
  persona:
    description: 'The persona to use in the prompt (developer, kent_beck, marc_benioff, yoda)'
    required: false
    default: 'kent_beck'
  style:
    description: 'The style of output to use (concise, zen)'
    required: false
    default: 'concise'
  include-full-files:
    description: 'Whether to include full files in addition to the diff (true or false)'
    required: false
    default: 'false'
  post-if-error:
    description: 'Whether to post a comment if there was an error'
    required: false
    default: 'false'
  exclude-files:
    description: 'A list of flags to exclude from the action (comma separated). E.g. "package.json,pyproject.toml"'
    required: false
    default: ''

outputs:
  results:
    description: 'Code review results (experimental)'

runs:
  using: 'composite'
  steps:
    - name: Checkout
      uses: actions/checkout@v2
      with:
        fetch-depth: 0

    - name: Install Python
      uses: actions/setup-python@v4
      with:
        python-version: '3.11'

    - name: Install Dependencies
      run: pip install -r ${{ github.action_path }}/requirements.txt
      shell: bash
    - name: Get common ancestor for branch point
      id: first_commit
      run: |
        # Find the common ancestor of the base branch and the head branch
        common_ancestor=$(git merge-base ${{ github.event.pull_request.base.sha }} ${{ github.event.pull_request.head.sha }})
        echo "sha=$common_ancestor" >> $GITHUB_OUTPUT
      shell: bash

    - name: Prepare excluded files
      id: prepare_exclude
      run: |
        exclude_flags=${{ inputs.exclude-files }}
        IFS=', ' read -r -a exclude_array <<< "$exclude_flags"
        exclude_str=""
        for index in "${!exclude_array[@]}"
        do
            exclude_str+="':!${exclude_array[index]}' "
        done
        echo "exclude_files=$exclude_str" >> $GITHUB_OUTPUT
      shell: bash
    
    - name: Run git diff
      id: git_diff
      run: |
        source $GITHUB_OUTPUT
        git diff --merge-base ${{ github.event.pull_request.base.sha }} ${{ github.event.pull_request.head.sha }} -- . ${{ steps.prepare_exclude.outputs.exclude_files }} > diff.txt
      shell: bash
    - name: Get git diff
      id: print_diff
      run: |
        echo "::set-output name=diff::$(cat diff.txt)"
      shell: bash
    - name: Print diff 
      run: echo "${{ steps.print_diff.outputs.diff }}"
      shell: bash
    - name: Run OpenAI code review
      id: openai
      run: |
        cat diff.txt | python ${{ github.action_path }}/action_code_review.py > review.txt
        echo 'reviewresult<<EOF' >> $GITHUB_OUTPUT
        echo "$(cat review.txt)" >> $GITHUB_OUTPUT
        echo 'EOF' >> $GITHUB_OUTPUT
      shell: bash
      env:
        GITHUB_TOKEN: ${{ inputs.github-token }}
        API_TO_USE: ${{ inputs.api-to-use }}
        OPENAI_API_KEY: ${{ inputs.openai-key }}
        ANTHROPIC_API_KEY: ${{ inputs.anthropic-key }}
        MODEL: ${{ inputs.model }}
        PERSONA: ${{ inputs.persona }}
        STYLE: ${{ inputs.style }}
        INCLUDE_FILES: ${{ inputs.include-full-files }}
        COMMIT_TITLE: ${{ github.event.pull_request.title }}
        COMMIT_BODY: ${{ github.event.pull_request.body }}

    - name: Show output in case of failure
      id: err-output
      if: failure()
      run: |
        echo 'errorresult<<EOF' >> $GITHUB_OUTPUT
        echo "ERROR: $(cat review.txt)" >> $GITHUB_OUTPUT
        echo 'EOF' >> $GITHUB_OUTPUT
        echo "Review result and error: $(cat review.txt)"
      shell: bash

    - name: Create comment
      if: success() || (inputs.post-if-error && inputs.post-if-error != 'false')
      uses: peter-evans/create-or-update-comment@v3
      with:
        issue-number: ${{ github.event.pull_request.number }}
        body: |
          # Review:
          ${{ steps.openai.outputs.reviewresult && steps.openai.outputs.reviewresult || steps.err-output.outputs.errorresult }}

branding:
  icon: 'user-check'
  color: 'green'