bbtree 0.1.2

Blessed B-tree.
Documentation 
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name: Version change
description: >
  The package version at the checked-out commit, and whether it differs from
  the version at another commit. A change of version is a release: ci.yml
  runs the release checks on a pull request that
  makes one, and publish.yml publishes the push to main that merges it. Both
  ask this action, so that they agree on what a release is.

inputs:
  base:
    description: The commit to compare the checked-out one against.
    required: true

outputs:
  version:
    description: The package version at the checked-out commit.
    value: ${{ steps.compare.outputs.version }}
  changed:
    description: "`true` if the version differs from the one at `base`, else `false`."
    value: ${{ steps.compare.outputs.changed }}

runs:
  using: composite
  steps:
    - id: compare
      shell: bash
      env:
        BASE: ${{ inputs.base }}
      run: |
        git fetch --quiet --depth=1 origin "$BASE"
        version_at() {
          git show "$1:Cargo.toml" | python3 -c \
            'import sys, tomllib; print(tomllib.load(sys.stdin.buffer)["package"]["version"])'
        }
        version=$(version_at HEAD)
        base_version=$(version_at "$BASE")
        echo "version=$version" >> "$GITHUB_OUTPUT"
        if [ "$version" = "$base_version" ]; then
          echo "changed=false" >> "$GITHUB_OUTPUT"
        else
          echo "changed=true" >> "$GITHUB_OUTPUT"
          echo "::notice::A release: version $base_version becomes $version"
        fi