#!/bin/bash
# Exec shell into running container.

set -euo pipefail

select_container() {
  docker ps | fzf \
    --header-lines=1 \
    --select-1 --exit-0 \
    --preview-label="Logs" \
    --preview-window=down,10 \
    --preview "docker logs --tail=9 {1}" | awk '{print $1}'
}

main() {
  if [ $# -eq 0 ]; then
    container=$(select_container)
  else
    if ! docker inspect "$1" >/dev/null 2>&1; then
      echo "No running container: $1"
      exit 1
    fi
    container="$1"
  fi
  for command in /bin/bash /bin/sh; do
    docker exec --interactive --tty "$container" "$command" || continue && exit 0
  done
}

main "$@"