drat--update-readme.yaml

on: push

name: drat-readme

jobs:
  drat-readme:
    name: Update README
    runs-on: ubuntu-latest
    env:
      R_REMOTES_NO_ERRORS_FROM_WARNINGS: true

    steps:
      - uses: actions/checkout@v3
        with:
          fetch-depth: '0' # Allows correct dates in git history

      - uses: r-lib/actions/setup-r@v2

      - name: update repo indices # Needed if tar balls removed manually
        run: |
          install.packages("drat")
          drat::updateRepo(".")
        shell: Rscript {0}

      - name: Drat -- update README.md
        if: success()
        run: |
          # Grab the portion of the file we want to re-use:
          # from the beginning to the "last_line" that should be reused
          last_line='<!-- list of packages: start | DO NOT REMOVE THIS LINE -->'
          awk '/^# /, /^'"$last_line"'/' README.md > README.tmp

          # =================================================================
          # Insert the list of packages (current versions)

          echo "" >> README.tmp # add blank line
          echo "Packages currently residing here:"  >> README.tmp
          echo "" >> README.tmp # add blank line

          echo "Package          | Version      | Updated on    " >> README.tmp
          echo "---------------- | ------------ | ------------- " >> README.tmp
          git ls-files -z '*.tar.gz'                            |\
              xargs -0 -I {} -- git log -1 --format="%as {}" {} |\
              grep \.tar\.gz$                                   |\
              grep '(Archive|SKELETON)' -vE                     |\
              sed 's/src\/contrib\///g'                         |\
              sed 's/_|.tar.gz/ /g' -E                          |\
              awk '{printf "%-16s | %-12s | %s\n", $2, $3, $1}' |\
              sort -t$'|' -k1i,1 -k2Vr,2                        >> README.tmp

          echo "" >> README.tmp # add blank line

          # =================================================================
          # Insert the list of packages (old versions)

          # Do if any archived .tar.gz file exists
          if [[ -n $(find "src/contrib" -type f | grep 'Archive/.*\.tar.gz$') ]]
          then
            echo "Previous (archived) versions of the packages residing here: " >> README.tmp
            echo "" >> README.tmp # add blank line

            echo "Package          | Version      | Updated on    " >> README.tmp
            echo "---------------- | ------------ | ------------- " >> README.tmp
            git ls-files -z '*Archive/*.tar.gz'                   |\
              xargs -0 -I {} -- git log -1 --format="%as {}" {}   |\
              sed 's/src\/contrib\/Archive\/.*\///g'              |\
              sed 's/(_|.tar.gz)/ /g' -E                          |\
              awk '{printf "%-16s | %-12s | %s\n", $2, $3, $1}'   |\
              sort -t$'|' -k1i,1 -k2Vr,2                          >> README.tmp
              
            echo "" >> README.tmp # add blank line
          fi

          # Add timestamp
          echo "<p align=\"right\"> $(date +"%Y-%m-%d %T %Z") </p>" >> README.tmp

          # Create a new version of README.md
          mv README.tmp README.md

      - name: Commit and push
        if: success()
        run: |
          git config --global user.email "actions@github.com"
          git config --global user.name  "GitHub Actions"
          git commit README.md -m "Update README" || echo "Nothing to commit"
          git push origin                         || echo "Nothing to commit"