action.yml

name: 'Merge coverage reports'
author: 'selfagency'
description: 'Merge Istanbul coverage reports'
branding:
  icon: 'git-merge'
  color: 'green'
inputs:
  source:
    description: 'Path to source code'
    required: true
  coverage-reports:
    description: 'Path to coverage reports'
    required: true
  output-folder:
    description: 'Where to output merged reports'
    required: true
  formats:
    description: 'Comma-separated list of formats to output'
    required: false
  artifacts:
    description: 'Whether to create artifacts'
    required: false
    default: 'true'
outputs:
  report:
    description: 'Coverage report'
    value: steps.merge-coverage.outputs.report
  json-summary:
    description: 'JSON coverage summary'
    value: steps.merge-coverage.outputs.json
runs:
  using: 'composite'
  steps:
    - name: Setup Node
      uses: actions/setup-node@v4
      with:
        node-version: 20

    - name: Configure reporters
      id: configure-reporters
      uses: actions/github-script@v6
      if: ${{ !steps.merge-coverage.outputs.skip }}
      with:
        script: |
          const reporters = '${{ inputs.formats }}'.split(',');
          if (reporters.length) {
            let reporterConfig = '';
            reporters.forEach(reporter => {
              reporterConfig += `--reporter ${reporter} `;
            });
            core.setOutput('reporters', reporterConfig);
          }

    - name: Install dependencies
      shell: bash
      if: ${{ steps.cache.outputs.cache-hit != 'true' }}
      run: npm i -g nyc

    - name: Collect coverage reports
      uses: actions/github-script@v6
      with:
        script: |
          const {readdir, writeFile, copyFile, mkdir} = require('fs').promises;
          await mkdir(`${{ github.workspace }}/coverage`);
          const reports = await readdir('${{ inputs.coverage-reports }}', { withFileTypes: true });
          
          const reportDirs = reports.filter(dirent => dirent.isDirectory()).map(dirent => dirent.name);       
          for (const dir of reportDirs) {
            await copyFile(`${{ inputs.coverage-reports }}/${dir}/coverage-final.json`, `${{ github.workspace }}/coverage/${dir}.json`)
          }; 
          
          const reportFiles = reports.filter(dirent => dirent.isFile() && dirent.name.includes('.json')).map(dirent => dirent.name);
          for (const file of reportFiles) {
            await copyFile(`${{ inputs.coverage-reports }}/${file}`, `${{ github.workspace }}/coverage/${file}.json`)
          }; 

    - name: Merge coverage
      shell: bash
      run: |
        nyc merge ${{ github.workspace }}/coverage ${{ github.workspace }}/coverage/coverage-final.json

    - name: Output coverage report
      shell: bash
      working-directory: ${{ inputs.source }}
      run: |
        nyc report -t ${{ github.workspace }}/coverage --reporter text --reporter json --reporter json-summary ${{ steps.configure-reporters.outputs.reporters }} --report-dir ${{ inputs.output-folder }} | tee ${{ inputs.output-folder }}/coverage-final.txt
        
        report=$(cat ${{ inputs.output-folder }}/coverage-final.txt)
        report="${report//'%'/'%25'}"
        report="${report//$'\n'/'%0A'}"
        report="${report//$'\r'/'%0D'}"
        echo -e "::set-output name=report::${report}"
        echo -e "::notice::Code Coverage Report%0A%0A${report}"
        
        json=$(cat ${{ inputs.output-folder }}/coverage-summary.json)
        json="${json//'%'/'%25'}"
        json="${json//$'\n'/'%0A'}"
        json="${json//$'\r'/'%0D'}"
        echo -e "::set-output name=json::${json}"

    - name: Upload coverage reports
      uses: actions/upload-artifact@v3
      if: ${{ inputs.artifacts == 'true' }}
      with:
        name: coverage-reports
        path: |
          ${{ inputs.output-folder }}
          ${{ github.workspace }}/coverage