action.yml

name: 'changelog-generator'
description: 'Runs github changelog generator'
inputs:
  changelog-path:
    description: "path to the changelog file"
    required: false
    default: ./CHANGELOG.md
  changelog-config-path:
    description: "path to the changelog config"
    required: true
  future-release:
    description: "release name (e.g. `v1.2.3-dev.1`)"
    required: true
  previous-release:
    description: "release name of previous release (e.g. `v1.2.3-dev.1`), if set will only generate the changelog up to and including this version"
    required: false
  output-only-current-release:
    description: "cut output to only show changes from future release (this requires previous-release to be set)"
    required: false
  optional-arg:
    description: "optional argument for the generator command"
    required: false
  github-token:
    description: "token used to call github API"
    required: true

runs:
  using: "composite"
  steps:

    - name: Determine since arg
      shell: bash
      run: |
        PREVIOUS_RELEASE=${{ inputs.previous-release }}
        if [[ $PREVIOUS_RELEASE != '' ]]; then
          SINCE_ARG="--since-tag $PREVIOUS_RELEASE"
        fi
        echo SINCE_ARG=$SINCE_ARG
        echo SINCE_ARG=$SINCE_ARG >> $GITHUB_ENV

    - name: Prepare Repository For Changelog Generator
      shell: bash
      run: |
        GITHUB_REPOSITORY_USER=$( echo $GITHUB_REPOSITORY | awk -F'/' '{print $1}') 
        GITHUB_REPOSITORY_PROJECT=$( echo $GITHUB_REPOSITORY | awk -F'/' '{print $2}')

        echo GITHUB_REPOSITORY_USER=$GITHUB_REPOSITORY_USER
        echo GITHUB_REPOSITORY_PROJECT=$GITHUB_REPOSITORY_PROJECT

        echo GITHUB_REPOSITORY_USER=$GITHUB_REPOSITORY_USER >> $GITHUB_ENV
        echo GITHUB_REPOSITORY_PROJECT=$GITHUB_REPOSITORY_PROJECT >> $GITHUB_ENV

    - name: Run github-changelog-generator
      uses: docker://eiha/github-changelog-generator:latest
      with:
        args: >
          --output ${{ inputs.changelog-path }}
          --config-file ${{ inputs.changelog-config-path }}
          --user ${{ env.GITHUB_REPOSITORY_USER }}
          --project ${{ env.GITHUB_REPOSITORY_PROJECT }} 
          --token ${{ inputs.github-token }} 
          --future-release ${{ inputs.future-release }} 
          ${{ env.SINCE_ARG }}
          ${{ inputs.optional-arg }}

    - name: Populate changelog descriptions
      shell: bash
      run: |
        .github/workflows/scripts/populate-changelog-descriptions.sh ${{ inputs.changelog-path }}

    - name: Cut other releases
      if: ${{ inputs.output-only-current-release }}
      shell: bash
      run: |
        CURRENT_VERSION=${{ inputs.future-release }}
        ESCAPED_CURRENT_VERSION=${CURRENT_VERSION//./\\.}
        # cut everything before the current release changes
        sed -n -z -E "s/.*$ESCAPED_CURRENT_VERSION\)(.*)/\1/p" -i ${{ inputs.changelog-path }}
        
        # cut everything after the current release changes based on the footer text
        sed -n -z -E 's/(.*)(\\\* \*This.*)/\1/p' -i ${{ inputs.changelog-path }}

    - name: Log ${{ inputs.changelog-path }}
      shell: bash
      run: cat ${{ inputs.changelog-path }}