dokku/plugins/shell/subcommands/default

#!/usr/bin/env bash
set -eo pipefail
[[ $DOKKU_TRACE ]] && set -x

cmd-shell-default() {
  declare desc="dokku shell interpreter via command line"
  declare cmd="shell"
  local INPUTRC="$PLUGIN_ROOT/inputrc"
  local HISTFILE=~/.dokku_history

  history -r || true

  trim() {
    sed -e 's/^[[:space:]]*//g' -e 's/[[:space:]]*$//g'
  }

  trap 'history -w' EXIT

  while true; do
    trap '' SIGINT
    read -rep "dokku> " line || {
      echo
      true
      break
    }
    trap - SIGINT

    local line=$(echo "$line" | trim)
    local CMD=$(echo "$line" | awk '{ print $1 }')

    [[ -z $CMD ]] && continue

    [[ "$line" != "$(fc -ln -1 | trim)" ]] && history -s "$line"

    case $CMD in
      # shell builtins
      clear)
        clear
        ;;

      quit | exit)
        break
        ;;

      # Not a built-in, run as regular dokku command
      *)
        dokku $line || true
        ;;
    esac

  done
}

cmd-shell-default