tag.yml

name: Tag by build.txt version (Windows)

on:
  push:
    branches: ["master"]
    paths: ["build.txt"] # run only when build.txt changes

permissions:
  contents: write # allow GITHUB_TOKEN to push a tag

jobs:
  tag-version:
    runs-on: windows-latest

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          fetch-depth: 0 # need full history to create a tag

      - name: Extract version from build.txt
        id: get_version
        shell: pwsh
        run: |
          $line    = Select-String -Path "build.txt" -Pattern '^version\s*=' | Select-Object -First 1
          $version = ($line -split '=')[1].Trim()
          Write-Host "Detected version: $version"
          Add-Content -Path $env:GITHUB_OUTPUT -Value "version=$version"

      - name: Tag commit
        env:
          TAG_NAME: "v${{ steps.get_version.outputs.version }}"
        shell: pwsh
        run: |
          git config user.name  "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"

          git rev-parse $env:TAG_NAME 2>$null
          if ($LASTEXITCODE -eq 0) {
              Write-Host "Tag $env:TAG_NAME already exists – skipping."
              exit 0
          }

          git tag -a $env:TAG_NAME -m "Release $env:TAG_NAME"
          git push origin $env:TAG_NAME