create_pr_on_pr.yml

name: Create and Update Translation Branches and PRs

# This will run when there is a push to any English language branch
# With the format listed below.
on:
  push:
    branches:
      - 'handbook_v*_en'

jobs:
  create_and_update_translation_branches:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
        uses: actions/checkout@v3


      - name: Set up Git and Github CLI
        run: |
          git config --global user.name 'ntluong95'
          git config --global user.email 'ph.ntluong95@gmail.com'
          sudo apt update
          sudo apt install -y gh

      - name: Fetch all branches
        run: git fetch --all

      - name: Create and update language branches and PRs
        run: |
          LANGS=("fr" "es" "vn" "jp" "tr" "pt" "ru")  
          EN_BRANCH="${{ github.ref }}"
          VERSION_SUFFIX="${EN_BRANCH#refs/heads/handbook_}"

          for lang in "${LANGS[@]}"; do
            TRANSLATION_BRANCH="handbook_${VERSION_SUFFIX/_en/_$lang}"
            git fetch --prune
            
            # Ensure we have all history
            git fetch --all            

            #! Check if the translation branch exists
            if git ls-remote --exit-code --heads origin "${TRANSLATION_BRANCH}"; then
              echo "Branch ${TRANSLATION_BRANCH} exists. Checking out and rebasing with ${EN_BRANCH}"
              git checkout "${TRANSLATION_BRANCH}"
              git pull -s recursive -X theirs --no-rebase --no-edit origin "${EN_BRANCH#refs/heads/}" --allow-unrelated-histories
            else
              echo "Branch ${TRANSLATION_BRANCH} does not exist. Creating new branch from ${EN_BRANCH}."
              git checkout -b "${TRANSLATION_BRANCH}"
              git pull origin "${EN_BRANCH#refs/heads/}"
            fi
            
            #! Force push the changes to the remote repository
            git push origin "${TRANSLATION_BRANCH}" --force

            #! Get the list of changed .qmd files
            changed_files=$(git diff --name-only "${EN_BRANCH}" | grep '\.qmd$')

            if [ -z "$changed_files" ]; then
              echo "No .qmd file changes to include in PR for ${TRANSLATION_BRANCH}"
              continue
            fi

            echo "Changed files: $changed_files"
            
            
            #! Get the date of the latest commit on the english branch
            latest_commit_date=$(git show -s --format=%ci ${EN_BRANCH})
            
            echo "Commits on the English branch that were made after the latest commit on the translation branch at $latest_commit_date"
            latest_commit_en_branch=$(git show --format=%H -s ${EN_BRANCH})
            latest_commit_info=$(git log ${EN_BRANCH} --since="$latest_commit_date" --format="%H %s" --reverse)
            commit_messages=$(echo "$latest_commit_info" | cut -d' ' -f2-)
            latest_commit_main=$(git show --format=%H -s origin/master)
            
            echo $latest_commit_en_branch
            echo $latest_commit_main
            echo $latest_commit_info

            #! Check if there are new commits
            if [ "$latest_commit_en_branch" == "$latest_commit_main" ]; then
              echo "No new commits to include in PR for ${TRANSLATION_BRANCH}"
              continue
            fi
            
            #! Check if a PR already exists for this branch
            PR_EXISTS=$(gh pr list --head "${TRANSLATION_BRANCH}" --state open --json number --jq length)
            if [ "$PR_EXISTS" -eq 0 ]; then
              echo "Creating new PR for ${TRANSLATION_BRANCH}"
              PR_URL=$(gh pr create --base deploy-preview --head "$TRANSLATION_BRANCH" --title "Handbook ${VERSION_SUFFIX/_en/} $lang" --body "Automated pull request for $lang handbook version ${VERSION_SUFFIX/_en/}")
              PR_NUMBER=$(echo "$PR_URL" | grep -oE '[0-9]+$')
            else
              #! Get the PR number for the translation branch
              echo "PR already exists for ${TRANSLATION_BRANCH}"
              PR_NUMBER=$(gh pr list --head "${TRANSLATION_BRANCH}" --state open --json number --jq ".[0].number")
            fi

            echo "Pull Request Number: $PR_NUMBER"

            #! Initialize new PR body
            new_pr_body="# Automated pull request for $lang handbook version ${VERSION_SUFFIX/_en/}"
            
            #! Add new commits as checkboxes to the PR description
            IFS=$'\n' # Change the Internal Field Separator to newline for correct iteration over lines
            checkboxes=""
            for file in $changed_files; do
              #! List only new commits compared with the main branch, tail -n +2 to skip the first line of output from git log, the latest commit will not be added into the message
              list_commits=$(git log origin/main..${TRANSLATION_BRANCH} --follow --pretty=format:"%H" -- $file | tail -n +2 | paste -sd, - | sed 's/,/, /g')
              for commit in $latest_commit_en_branch; do
                checkboxes="$checkboxes- [ ] Chapter [\`$file\`](https://github.com/${{ github.repository }}/pull/$PR_NUMBER/files?file-filters%5B%5D=.qmd&show-viewed-files=true) has new changes in the following commit(s): $list_commits. "

                #! Mention a user in the PR description
                case "$lang" in
                  "vn") checkboxes="$checkboxes @ntluong95, please review changes and check the box when you finish" ;;
                  "fr") checkboxes="$checkboxes @oliviabboyd, please review changes and check the box when you finish" ;;
                  "es") checkboxes="$checkboxes @amateo250, please review changes and check the box when you finish" ;;
                  "jp") checkboxes="$checkboxes @hitomik723, please review changes and check the box when you finish" ;;
                  "tr") checkboxes="$checkboxes @ntluong95, please review changes and check the box when you finish" ;;
                  "pt") checkboxes="$checkboxes @Luccan97, please review changes and check the box when you finish" ;;
                  "ru") checkboxes="$checkboxes @ntluong95, please review changes and check the box when you finish" ;;
                esac

                checkboxes="$checkboxes"$'\n'"$checkbox"
                
              done
            done

            if [ -n "$checkboxes" ]; then
              # Append the checkboxes to the new PR body
              new_pr_body="$new_pr_body"$'\n'"$checkboxes"
            fi

            gh api repos/${{ github.repository }}/issues/$PR_NUMBER --method PATCH --field body="$new_pr_body"

          done
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}