action.yml

name: GitHub Release
description: Create a GitHub release with generated notes, an optional notes file and assets.

inputs:
  tag:
    description: Tag of the release (e.g. 'v2025.06.2')
    required: true
  version:
    description: Value replacing '@VERSION@' in the notes file, defaults to the tag without leading 'v'
    required: false
    default: ''
  notes-file:
    description: File appended to the generated notes, empty to skip
    required: false
    default: ''
  assets:
    description: Glob patterns of files to attach, one per line
    required: false
    default: ''
  token:
    description: Token used to create the release
    required: false
    default: ${{ github.token }}

runs:
  using: composite
  steps:
    - shell: bash
      env:
        GH_TOKEN: ${{ inputs.token }}
        TAG: ${{ inputs.tag }}
        VERSION: ${{ inputs.version }}
        NOTES_FILE: ${{ inputs.notes-file }}
        ASSET_PATTERNS: ${{ inputs.assets }}
      run: |
        set -euo pipefail
        VERSION="${VERSION:-${TAG#v}}"

        shopt -s nullglob globstar
        ASSETS=()
        while IFS= read -r pattern; do
          [ -z "$pattern" ] && continue
          for file in $pattern; do
            ASSETS+=("$file")
          done
        done <<< "$ASSET_PATTERNS"
        if [ ${#ASSETS[@]} -gt 0 ]; then
          printf 'attaching %s\n' "${ASSETS[@]}"
        fi

        if [ "$(git rev-parse --is-shallow-repository)" = "true" ]; then
          git fetch --quiet --unshallow --tags origin || echo "could not fetch the history, the changelog starts at the latest release"
        fi

        NOTES_ARGS=(-f "tag_name=${TAG}")
        if PREV="$(git describe --tags --abbrev=0 --match 'v[0-9]*' "${TAG}^" 2>/dev/null)"; then
          echo "changelog starts after ${PREV}"
          NOTES_ARGS+=(-f "previous_tag_name=${PREV}")
        fi
        gh api --method POST "repos/${GITHUB_REPOSITORY}/releases/generate-notes" \
          "${NOTES_ARGS[@]}" --jq '.body' > "${RUNNER_TEMP}/release-notes.md"

        if [ -n "$NOTES_FILE" ]; then
          NOTES="$(< "$NOTES_FILE")"
          printf '\n%s\n' "${NOTES//@VERSION@/$VERSION}" >> "${RUNNER_TEMP}/release-notes.md"
        fi

        gh release create "$TAG" \
          --title "$TAG" \
          --notes-file "${RUNNER_TEMP}/release-notes.md" \
          "${ASSETS[@]}"