desktop-change.completion

#!/usr/bin/env bash 


### 補完関数。
_desktop_change(){

  curr="${COMP_WORDS[$COMP_CWORD-1]}"
  cmd=${COMP_WORDS[0]} 

  case $COMP_CWORD in 
    1)
      if [[ $cmd == $curr   ]] ; then 
        opts=$( $cmd --help | $(which grep) -Po '(?<=\s\s)\-[a-z]' | sort | uniq  )
        COMPREPLY=( $(compgen -W "$opts"  -- ${COMP_WORDS[COMP_CWORD]}  ) ) 
        return 0;
      fi
    ;;
    2)
    case ${COMP_WORDS[1]} in 
      -c|-r)
        COMPREPLY=( $(compgen -W "$( $cmd -l | xargs -I@ echo "'@'")" ${COMP_WORDS[COMP_CWORD]}  ) ) 
        return 0 
        ;;
      *)
        ;;
    esac
    ;;
  esac

}
complete -F _desktop_change desktop-change