name: Deploy to gh-pages branch

on:
  push:
    branches:
      - main
    paths:
      - 'EasyDutch/**'
      - 'EasyDutch.txt'
      - 'tools/easydutch-filters.template'

# https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#example-only-cancel-in-progress-jobs-or-runs-for-the-current-workflow
concurrency: 
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

permissions:
  contents: read

jobs:
  publish:
    permissions:
      contents: write  # for Git to git push
    name: Publish lists
    runs-on: ubuntu-latest
    steps:
      - name: Repo check
        run: |
          if [[ "$GITHUB_REPOSITORY_OWNER" != "EasyDutch-uBO" ]]; then
            echo "This GitHub Action is meant to deliver filter lists for EasyDutch."
            echo "You shouldn't need to run this GitHub Action in your fork."
            echo "If you do, please customize the cron expression above, and the URLs below."
            exit 1
          fi
          exit 0
      - name: Sleep for 5 minutes
        run: sleep 300s
        shell: bash
      - name: Clone EasyDutch
        uses: actions/checkout@v3
        with:
          ref: gh-pages
      - name: Generate version string
        run: |
          TAGNAME=$(date -u "+%Y.%-m.%-d.")$(date -u "+%H*60+%M" | bc)
          echo "TAGNAME=$TAGNAME" >> $GITHUB_ENV
          echo "Version string is $TAGNAME"
      - name: Copy shell script from EasyDutch-uBO/EasyDutch
        run: |
          TMPDIR=$(mktemp -d)
          git clone --depth=1 --single-branch --branch=main https://github.com/EasyDutch-uBO/EasyDutch.git $TMPDIR
          cp -v $TMPDIR/tools/make-diffpatch.sh .
          cp -v $TMPDIR/tools/update-diffpatches.sh .
      - name: Copy filter lists to gh-pages
        run: |
          TMPFILE=$(mktemp -d)
          git clone --depth=1 https://github.com/EasyDutch-uBO/EasyDutch.git $TMPFILE
          pushd $TMPFILE > /dev/null
          echo "*** EasyDutch: Assembling EasyDutch.txt"
          node ./tools/make-easydutch.js in=./tools/easydutch-filters.template out=./EasyDutch.all.txt minify=1
          popd > /dev/null
          cp $TMPFILE/EasyDutch/*.txt EasyDutch/
          cp $TMPFILE/EasyDutch.txt EasyDutch.txt
          cp $TMPFILE/EasyDutch.all.txt EasyDutch.all.txt
      - name: Patch last-updated field
        run: |
          DATE=$(date -Ru)
          for f in $(git diff --name-only); do
            STAT=$(git diff --numstat $f | sed -r '/^1\s+1\s+/d')
            if [[ -n $STAT ]]; then
              sed -ir "0,/^! Last updated: /s/^\(! Last updated: \)%timestamp%/\\1$DATE/" $f
            else
              git checkout -q $f
            fi
          done
      - name: Create new patch
        run: |
          chmod 755 ./make-diffpatch.sh
          ./make-diffpatch.sh "${{ env.TAGNAME }}"
      - name: Update existing patch
        run: |
          chmod 755 ./update-diffpatches.sh
          ./update-diffpatches.sh "${{ env.TAGNAME }}"
      - name: Commit changes (if any)
        run: |
          if [[ -z $(git diff --name-only --cached) ]]; then exit 0; fi
          git config user.name "GitHub-Actions"
          git config user.email "<>"
          git commit -m "Update modified filter lists to ${{ env.TAGNAME }}"
          git push origin gh-pages
          git tag ${{ env.TAGNAME }}
          git push origin ${{ env.TAGNAME }}