Check if a PR is ready to merge using GH CLI and merge it if all checks pass.

automerge.sh

# Monitors the current GitHub pull request and automatically merges it when ready.
# 
# Conditions:
# - Runs up to 30 minutes, checking every 30 seconds (max 60 attempts).
# - Exits if any status checks fail.
# - Merges when the PR is open, mergeable, and has a clean merge state.
# - Uses squash merge and deletes the source branch.
#
# Output:
# - Logs status checks, elapsed time, merge success, or timeout.
automerge() {
  echo "Starting auto-merge watcher (max 30 minutes)..."
  pr=$(gh pr view --json number -q .number)
  start_time=$(date +%s)

  tput civis
  trap 'tput cnorm; exit' INT TERM

  for ((i=0; i<60; i++)); do
    clear
    elapsed=$(( $(date +%s) - start_time ))
    minutes=$(( elapsed / 60 ))
    seconds=$(( elapsed % 60 ))
    printf "Check %02d/60 [%02d:%02d elapsed]: monitoring PR #%s\n\n" $((i+1)) $minutes $seconds "$pr"

    raw=$(gh pr view --json statusCheckRollup -q \
  '.statusCheckRollup[] | select(.name != null) | "\(.name)|\(.status)|\(.conclusion)"')

    pending=0
    failed=0
    passed=0

    printf "%-45s | %-9s\n" "Check" "Status"
    printf -- "----------------------------------------------+-----------\n"

    while IFS='|' read -r name status conclusion; do
      color=""
      reset=$(tput sgr0)

      if [[ "$status" != "COMPLETED" ]]; then
        ((pending++))
        color=$(tput setaf 3)
        conclusion="PENDING"
      elif [[ "$conclusion" == "FAILURE" ]]; then
        ((failed++))
        color=$(tput setaf 1)
      else
        ((passed++))
        color=$(tput setaf 2)
      fi

      printf "%-45s | %s%-9s%s\n" "$name" "$color" "$conclusion" "$reset"
    done <<< "$raw"

    echo

    if (( failed > 0 )); then
      echo "$failed check(s) failed. Exiting."
      tput cnorm
      return 1
    elif (( pending > 0 )); then
      echo "$pending check(s) pending. Waiting 30 seconds..."
      sleep 30
      continue
    else
      echo "All checks passed."
    fi

    merge_ready=$(gh pr view --json mergeable,mergeStateStatus,state -q \
      'select(.state=="OPEN" and .mergeable=="MERGEABLE" and .mergeStateStatus=="CLEAN")')

    if [[ -n "$merge_ready" ]]; then
      echo "PR #$pr is ready. Merging..."
      gh pr merge --delete-branch --squash "$pr"
      echo "Merge complete after $minutes minutes and $seconds seconds."
      tput cnorm
      return
    fi

    echo "Not ready. Sleeping 30s..."
    sleep 30
  done

  echo "Timeout reached. PR not ready after 30 minutes."
  tput cnorm
}