a bash function for repeating a command with emoji status updates and a report of all failures at the end

repeat.sh

# usage: repeat_with_status <iterations> <command>
# note that due to the nature of `script`, locally defined aliases will not work in the <command>
function repeat_with_status {
  local count=$1
  shift
  local success_count=0
  local error_count=0
  local output

  declare -a failures=()

  # Force color output
  export FORCE_COLOR=true
  export CLICOLOR_FORCE=1

  for ((i=0; i<count; i++)); do
    if ((i % 10 == 0)); then
      if ((i != 0)); then
        printf "\n"
      fi
      printf "run $((i+1))..."
      if ((i == 0)); then
        printf " "
      fi
    fi

    output=$(script -q /dev/null "$@" 2>&1)
    if [ $? -eq 0 ]; then
      ((success_count++))
      printf "✅"
    else
      ((error_count++))
      printf "❌"

      failures+=("Failed on iteration $((i+1)):")
      failures+=("$output")
      failures+=("---")
    fi
  done
  printf "\n"
  echo "good runs: $success_count"
  echo "bad runs: $error_count"

  # Print failure messages if there were any errors
  if ((error_count > 0)); then
    echo -e "\nFailure details:"
    printf '%s\n' "${failures[@]}"
  fi
}