action.yml

name: Flutter Bump Version
description: This action increases the version number of a Flutter project when a pull request is merged.

inputs:
  token:
    description: 'The GitHub token to use'
    required: true

  branch:
    description: 'The branch to checkout and to push the changes to'
    required: false
    default: 'main'

branding:
  icon: 'arrow-up-circle'
  color: 'blue'

runs:
  using: 'composite'
  steps:
    - name: Checkout repository
      uses: actions/checkout@v2
      with:
        ref: ${{ inputs.branch }}
        token: ${{ inputs.token }}

    - name: Increase version
      id: versioning
      shell: bash
      run: |
        # Extracting the current build number
        buildNumber=$(grep 'version: ' pubspec.yaml | sed 's/.*+//')
        
        # Incrementing the build number
        newBuildNumber=$((buildNumber + 1))
        
        # Pad the newBuildNumber with leading zeros to ensure it has at least 4 digits
        paddedBuildNumber=$(printf "%04d" "$newBuildNumber")
        
        # Extracting parts for the new version
        minor=${paddedBuildNumber:${#paddedBuildNumber}-2}
        middle=${paddedBuildNumber:${#paddedBuildNumber}-3:1}
        major=${paddedBuildNumber:0:${#paddedBuildNumber}-3}
        
        # Construct the new version
        newVersion="$major.$middle.$minor"
        
        # Update pubspec.yaml with the new version and build number
        sed -i "s/version: .*/version: $newVersion+$newBuildNumber/" pubspec.yaml

        echo "::set-output name=version::$newVersion"

    - name: Commit changes
      shell: bash
      run: |
        git config --local user.email 'action@github.com'
        git config --local user.name 'GitHub Action'
        git add pubspec.yaml
        git commit -m '${{ steps.versioning.outputs.version }}'

    - name: Push changes
      uses: ad-m/github-push-action@v0.6.0
      with:
        github_token: ${{ inputs.token }}
        branch: ${{ inputs.branch }}