name: Changelog assembled
description: >-
  Assert a release PR's stamped section is exactly what the changelog.d/
  fragments it consumed assemble to — the fragments as of the MERGE BASE
  are replayed through the assembler's --check and compared byte-for-byte
  against the section on HEAD (#116; the fragment flow is #112). Needs the
  HISTORY: the caller's checkout must use fetch-depth: 0, or the base ref
  will not resolve and strict mode (the default — CI must never skip)
  fails red with a message naming that fix. Inapplicable trees — a -dev
  tree, a legacy repo with no fragments directory at the merge base — pass
  with a NOTICE, never a silent skip.
inputs:
  base-ref:
    description: >-
      The ref the fragment set is read relative to. The default resolves
      the event's base branch — the PR's target on pull_request, the
      pushed branch itself on push (where the merge base IS HEAD and the
      check is vacuous by construction, named honestly in the log).
    required: false
    default: origin/${{ github.base_ref || github.ref_name }}
  changelog:
    description: Path to the changelog, relative to the workspace
    required: false
    default: CHANGELOG.md
  fragments-dir:
    description: Path to the fragments directory, relative to the workspace
    required: false
    default: changelog.d
  version-source:
    description: Where the tree's version lives ("file" or "package-json")
    required: false
    default: file
  strict:
    description: >-
      "1" (the default) makes an unresolvable base ref a hard failure
      instead of a loud skip — a guard that can quietly stop guarding is
      the failure shape this family of checks exists to refuse. The local
      default in the script itself stays "0", so a plain working-copy run
      degrades sensibly.
    required: false
    default: "1"
runs:
  using: composite
  steps:
    - name: changelog assembled
      shell: bash
      env:
        CHANGELOG_ASSEMBLED_BASE: ${{ inputs.base-ref }}
        CHANGELOG: ${{ inputs.changelog }}
        CHANGELOG_ASSEMBLED_DIR: ${{ inputs.fragments-dir }}
        VERSION_SOURCE: ${{ inputs.version-source }}
        CHANGELOG_ASSEMBLED_STRICT: ${{ inputs.strict }}
      run: bash "$GITHUB_ACTION_PATH/changelog-assembled.sh"