version.yml

name: Increment Version

on:
  push:
    tags:
      - '*.*.*.*'

jobs:  
  build:
    runs-on: ubuntu-latest
    env:
      GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
    steps:
      - uses: actions/checkout@v2
      - name: Fetch Tag and Version Information
        run: |
          TAG=$(echo "${GITHUB_REF#refs/*/}")
          CURRENT_VERSION_ARRAY=($(echo "$TAG" | tr . '\n'))
          BASE=$(IFS=. ; echo "${CURRENT_VERSION_ARRAY[*]:0:2}")
          CURRENT_VERSION=$(IFS=. ; echo "${CURRENT_VERSION_ARRAY[*]:0:3}")
          CURRENT_VERSION_ARRAY[2]=$((CURRENT_VERSION_ARRAY[2]+1))
          NEXT_VERSION=$(IFS=. ; echo "${CURRENT_VERSION_ARRAY[*]:0:3}")
          echo "TAG=$TAG" >> $GITHUB_ENV
          echo "BASE=$BASE" >> $GITHUB_ENV
          echo "CURRENT_VERSION=$CURRENT_VERSION" >> $GITHUB_ENV
          echo "NEXT_VERSION=$NEXT_VERSION" >> $GITHUB_ENV
      - uses: actions/checkout@v2
        with:
          ref: ${{ env.BASE }}
      - name: Increment Version
        run: |
          echo Incrementing $CURRENT_VERSION to $NEXT_VERSION
          sed -i "s/$CURRENT_VERSION-SNAPSHOT/$NEXT_VERSION-SNAPSHOT/g" build.gradle
      - name: Create Pull Request
        uses: peter-evans/create-pull-request@v3
        with:
          base: ${{ env.BASE }}
          commit-message: Incremented version to ${{ env.NEXT_VERSION }}
          delete-branch: true
          title: '[AUTO] Incremented version to ${{ env.NEXT_VERSION }}.'
          body: |
            I've noticed that a new tag ${{ env.TAG }} was pushed, and incremented the version from ${{ env.CURRENT_VERSION }} to ${{ env.NEXT_VERSION }}.