action.yml

name: 'Git diff after script call'
description: |
  Check if content of given file changed after calling a script.
  Action can be used to check if content of commited autogenerated file is valid.
  Expected content of file can be found in check action's summary and artifacts sections.
inputs:
  script_call:
    description: 'Script which should be called'
    required: true
  diff_file:
    description: 'Path to file which should be inspected - relative to GitHub workspace'
    required: true
runs:
  using: "composite"
  steps:
    - name: 'Set env variables'
      run: |
        echo "DIFF_FILE_ABS='${{ github.workspace }}/${{ inputs.diff_file }}'" >> $GITHUB_ENV
        echo "DIFF_FILE_DIR=$(dirname '${{ github.workspace }}/${{ inputs.diff_file }}')" >> $GITHUB_ENV
        echo "DIFF_FILE_NAME=$(basename '${{ github.workspace }}/${{ inputs.diff_file }}')" >> $GITHUB_ENV
      shell: bash

    - name: Execute ${{ inputs.script_call }}
      run: ${{ inputs.script_call }}
      shell: bash

    - name: 'Upload Artifact: ${{ inputs.diff_file }}'
      uses: actions/upload-artifact@v4
      with:
        name: ${{ env.DIFF_FILE_NAME }}
        path: ${{ inputs.diff_file }}

    - name: Check for changes in ${{ inputs.diff_file }}
      working-directory: ${{ env.DIFF_FILE_DIR }}
      id: diff
      shell: bash
      run: |
        DIFF=$(git diff HEAD \
          --exit-code \
          --ignore-space-change \
          --ignore-all-space \
          --ignore-blank-lines \
          --ignore-cr-at-eol \
          --ignore-space-at-eol) \
          && true
        echo "diff_result=$?" >> $GITHUB_OUTPUT
        echo "$DIFF"
        {
          echo 'GITDIFF<<EOF'
          echo "$DIFF"
          echo EOF
        } >> $GITHUB_ENV

    - name: Post summary
      if: ${{ !cancelled() }}
      shell: bash
      run: |
        if [[ 1 == ${{ steps.diff.outputs.diff_result }} ]]; then
          echo -e 'New ${{ inputs.diff_file }} file differs from the current file.' >> $GITHUB_STEP_SUMMARY
        fi
        if [[ -e ${{ env.DIFF_FILE_ABS }} ]]; then
          echo -e '
          <details>
            <summary>${{ inputs.diff_file }}</summary>

          ```' >> $GITHUB_STEP_SUMMARY
          cat ${{ env.DIFF_FILE_ABS }} >> $GITHUB_STEP_SUMMARY
          echo -e '```

          </details>' >> $GITHUB_STEP_SUMMARY
        else
          echo -e 'Error during workflow, ${{ inputs.diff_file }} file was not created' >> $GITHUB_STEP_SUMMARY
        fi
        if [[ -n $GITDIFF ]] && [[ 1 == ${{ steps.diff.outputs.diff_result}} ]]; then
          echo -e '
          <details>
            <summary>${{ env.DIFF_FILE_NAME }} diff</summary>

          ``` diff' >> $GITHUB_STEP_SUMMARY
          echo "$GITDIFF" >> $GITHUB_STEP_SUMMARY
          echo -e '```

          </details>' >> $GITHUB_STEP_SUMMARY
        fi

        exit ${{ steps.diff.outputs.diff_result}}