part-compute-version.yml

name: ~Compute Version

on:
  workflow_call:
    inputs:
      prereleaseSlug:
        required: false
        type: string
      checkTagIsUnique:
        required: false
        type: boolean
    outputs:
      COALESCE_VERSION:
        description: "COALESCE_VERSION"
        value: ${{ jobs.version.outputs.COALESCE_VERSION }}

jobs:
  version:
    runs-on: ubuntu-latest

    outputs:
      COALESCE_VERSION: ${{ steps.version.outputs.COALESCE_VERSION }}

    steps:
      - uses: actions/checkout@v6

      - name: "Verify and set COALESCE_VERSION variable"
        id: version
        shell: pwsh
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          $apiBaseUrl = "${{ github.api_url }}/repos/${{ github.repository }}/actions"
          $runInfo = curl -s -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" "$apiBaseUrl/runs/${{ github.run_id }}";

          $workflowId = $runInfo | jq -r .workflow_id;
          $createdAt = $runInfo | jq -r .created_at;
          $createdAtPST = [System.TimeZoneInfo]::ConvertTimeBySystemTimeZoneId( [System.DateTimeOffset](Get-Date -Date $createdAt), "America/Los_Angeles" );

          echo "workflowId: $workflowId";
          echo "createdAt: $createdAt ($createdAtPST)";
            
          # Get how many runs of this workflow have happened today
          $dateFormat = "yyyy-MM-ddT00:00:00K"
          $revRequestUrl = "$apiBaseUrl/workflows/$workflowId/runs?created=$($createdAtPST.ToString($dateFormat))..$($createdAtPST.AddDays(1).ToString($dateFormat))";
          $rev = curl -s -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" $revRequestUrl | jq .total_count;

          # Current version number is sourced from the top of CHANGELOG.md
          $version = Get-Content -Path CHANGELOG.md -TotalCount 1

          $version = $version.Trim('#').Trim()

          $date = $createdAtPST.ToString("yyyyMMdd")
          $prereleaseSlug = "${{ inputs.prereleaseSlug }}"
          echo "Version from $($path): $version";
          echo "Prerelease: $prereleaseSlug";
          echo "Date: $date";
          echo "Rev: $rev";
          echo "checkTagIsUnique: ${{ inputs.checkTagIsUnique }}";

          if ($prereleaseSlug) {
            $version = "$version-$prereleaseSlug.$date.$rev"
          }

          echo "Computed version: $version";

          try
          {
              [System.Management.Automation.SemanticVersion]::Parse($version);
          }
          catch
          {
              Write-Error "'$version' is an invalid SemVer version"
              exit 1
          }

          if ("${{ inputs.checkTagIsUnique }}" -eq "true") {
            if (git tag -l "$version") {
              Write-Error "Tag $version already exists.";
              exit 1;
            }
          }

          echo "COALESCE_VERSION=$version" >> $env:GITHUB_OUTPUT
          echo "# Version $version" >> $env:GITHUB_STEP_SUMMARY