release.yml

name: Release

on:
  push:
    tags:
      - 'v*'

jobs:
  publish:
    name: Publish to crates.io
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v4
    - uses: dtolnay/rust-toolchain@stable
    
    - name: Check if version exists on crates.io
      id: check
      run: |
        VERSION=$(cargo metadata --no-deps --format-version 1 | jq -r '.packages[0].version')
        if cargo search mathcore --limit 1 | grep -q "mathcore = \"$VERSION\""; then
          echo "Version $VERSION already exists on crates.io"
          echo "exists=true" >> $GITHUB_OUTPUT
        else
          echo "Version $VERSION not found on crates.io"
          echo "exists=false" >> $GITHUB_OUTPUT
        fi
    
    - name: Publish to crates.io
      if: steps.check.outputs.exists == 'false'
      run: cargo publish --token ${{ secrets.CARGO_REGISTRY_TOKEN }}
      env:
        CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }}