draft-release.yml

name: Create a Draft Release

permissions:
  contents: write

on:
  push:
    branches:
      - main
  workflow_dispatch:

env:
  TRIGGER_BRANCH: main
  FILE_FILTER_PATTERN: '^(?!tests/).*\.py$'

jobs:
  create-release-draft:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout code and fetch tags
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Check for modified matching files
        id: check_changes
        run: |
          echo "Trigger branch: $TRIGGER_BRANCH"
          echo "File filter pattern: $FILE_FILTER_PATTERN"

          git fetch origin "$TRIGGER_BRANCH" --depth=2
          MODIFIED=$(git diff --name-only HEAD^ HEAD)

          echo "Modified files:"
          echo "$MODIFIED"

          MATCHING=$(echo "$MODIFIED" | grep -E "$FILE_FILTER_PATTERN" || true)

          echo "Matching files:"
          echo "$MATCHING"

          if [[ -n "$MATCHING" ]]; then
            echo "should_trigger=true" >> "$GITHUB_OUTPUT"
          else
            echo "should_trigger=false" >> "$GITHUB_OUTPUT"
          fi

      - name: Determine next tag version
        id: version
        run: |
          LATEST=$(git tag --sort=-v:refname | head -n 1)
          echo "Latest tag: $LATEST"

          if [[ -z "$LATEST" ]]; then
            NEXT_TAG="v0.0.1"
          else
            [[ "$LATEST" =~ ^v([0-9]+)\.([0-9]+)\.([0-9]+)(-.+)?$ ]]
            MAJOR=${BASH_REMATCH[1]}
            MINOR=${BASH_REMATCH[2]}
            PATCH=${BASH_REMATCH[3]}
            SUFFIX=${BASH_REMATCH[4]}
            MINOR=$((MINOR + 1))
            NEXT_TAG="v$MAJOR.$MINOR.$PATCH$SUFFIX"
          fi

          echo "Next tag: $NEXT_TAG"
          echo "tag=$NEXT_TAG" >> "$GITHUB_OUTPUT"

      - name: Create draft release
        if: steps.check_changes.outputs.should_trigger == 'true'
        run: |
          curl -X POST \
            -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" \
            -H "Accept: application/vnd.github+json" \
            https://api.github.com/repos/${{ github.repository }}/releases \
            -d '{
              "tag_name": "${{ steps.version.outputs.tag }}",
              "target_commitish": "'"$TRIGGER_BRANCH"'",
              "name": "${{ steps.version.outputs.tag }}",
              "draft": true,
              "prerelease": false,
              "generate_release_notes": true
            }'