rush-completion

#!/usr/bin/env bash
# shellcheck disable=SC2207

__rush_command() {
  ##############################################################################
  # rush --help
  # Lists commands:
  # * indented 4 spaces
  ##############################################################################
  local subcmds
  subcmds="$(rush -h | grep -e "^\s\s\s\s\w" | awk '{print $1}')"
  COMPREPLY+=($(compgen -W "$subcmds" -- "$1"))
}
__rush_command_option() {
  ##############################################################################
  # rush <command> --help
  # Lists options for <command>:
  # * indented by 2 spaces and starts with "-" : grep -e "\s\s-" : <awk group 1> (--?\w[-\w]*)
  # * may be either a flag or require a value : <awk group 2> ([,|\s\w+[\w|_]*,\s])*
  # * may or may not have shorthand : <awk group 1 "shortand or longhand"> (--?\w[-\w]*) and <awk group 3 "longhand"> (--\w[-\w]*)?
  ##############################################################################
  local options
#  local options="$(rush $1 -h | grep -e "\s\s-" | awk --source '/(--?\w[-\w]*)([,|\s\w+[\w|_]*,\s])*(--\w[-\w]*)?/{print $1} {print $3}' | grep "-" | awk 1 ORS=' ')"
  # need them unescaped
  # shellcheck disable=SC2086
  options="$(rush $1 -h | grep -e "\s\s-" | awk --source '/([\-\-?]?\w[-\w]*)([,|\s\w+[\w|_]*,\s])*(--\w[-\w]*)?/{print $1} {print $2} {print $3}' | sed 's/,//' | grep "-" | awk 1 ORS=' ')"
  COMPREPLY+=($(compgen -W "$options" -- "$2"))
}
_rush_complete() {
  local subcmd
  # This might not be used but has side effects?
  # shellcheck disable=SC2034
  subcmd="${COMP_WORDS[1]}"

  local cur=${COMP_WORDS[COMP_CWORD]}
  COMPREPLY=($(compgen -W "-h --help" -- "${cur}"))

  if [[ ${#COMP_WORDS[@]} == 2 ]]; then
    # Suggest rush commands
    __rush_command "${cur}"
  else
    # Suggest options for command
    __rush_command_option "${COMP_WORDS[1]}" "${cur}"
  fi

}

complete -F _rush_complete -o nospace rush