main.yml

name: Update README.md

on:
  push:
    branches: [ main ]

# A workflow run is made up of one or more jobs that can run sequentially or in parallel
jobs:
  # This workflow contains a single job called "build"
  build:
    # The type of runner that the job will run on
    runs-on: ubuntu-latest

    # Steps represent a sequence of tasks that will be executed as part of the job
    steps:
      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
      - uses: actions/checkout@v2

      - name: Install jq
        run: sudo apt-get install jq

      - name: Update languages in README.
        run: |
          blockStart="<!-- Languages start here -->"
          blockEnd="<!-- Languages end here -->"
          flag=""
          while IFS= read -r line; do
              if [[ $flag == "" ]]; then
                  echo $line >> tmp.md
              elif [[ $flag == "start" ]]; then
                  languages=`curl -sH "Accept: application/vnd.github.v3+json" https://api.github.com/repos/anuragdevon/Data-Structures/languages | jq -r 'keys[]'`
                  count=1
                  for language in $languages; do
                      echo "$count. $language" >> tmp.md
                      ((count++))
                  done
                  flag="end"
              elif [[ $flag == "end" && $line == $blockEnd ]]; then
                  echo $line >> tmp.md
                  flag=""
              fi
              if [[ $line == $blockStart ]]; then
                  flag="start"
              fi
          done < README.md
          rm README.md
          mv tmp.md README.md
      - name: Commit report
        run: |
          git config --global user.name 'Yash Karanke'
          git config --global user.email 'dex.papa@example.com'
          git commit -am "Update README.md"
          git push