snapper bash completion

snapper completion

__snappercomp() {
  local cur="${COMP_WORDS[COMP_CWORD]}"
  COMPREPLY=( $( compgen -W "$1" -- "$cur" ) )
}

# From http://github.com/jweslley/rails_completion
# @param $1 Name of variable to return result to
# @param $2 Command list
__snappercmd() {
  any_command=$(echo $2 | sed -e 's/[[:space:]]/|/g')
  for (( i=0; i < ${#COMP_WORDS[@]}-1; i++ )); do
    if [[ ${COMP_WORDS[i]} == @($any_command) ]]; then
      eval $1="${COMP_WORDS[i]}"
    fi
  done
}

__snapper_configs() {
  snapper list-configs | tail -n +3 | awk -F '|' '{ print $1 }'
}

_snapper() {
  local cur prev words cword options command commands
  _init_completion || return

  options="--quiet -q --verbose -v --table-style -t --config -c --no-dbus --version"
  commands="list-configs create-config delete-config get-config set-config \
    list create modify delete mount umount status diff xadiff undochange cleanup"
  
  settings="ALLOW_GROUPS= ALLOW_USERS= BACKGROUND_COMPARISON= \
    EMPTY_PRE_POST_CLEANUP= EMPTY_PRE_POST_MIN_AGE= \
    NUMBER_CLEANUP= NUMBER_LIMIT= NUMBER_LIMIT_IMPORTANT= NUMBER_MIN_AGE= \
    TIMELINE_CLEANUP= TIMELINE_CREATE= \
    TIMELINE_LIMIT_DAILY= TIMELINE_LIMIT_HOURLY= \
    TIMELINE_LIMIT_MONTHLY= TIMELINE_LIMIT_YEARLY= \
    TIMELINE_MIN_AGE="
  
  __snappercmd command "$commands"
  
  if [ -z "$command" ]; then
    case "$prev" in
      -c|--config)
        __snappercomp "$( __snapper_configs )"
        return
        ;;
    esac

    case "$cur" in
      -*) __snappercomp "$options" ;;
      *)  __snappercomp "$commands $options" ;;
    esac
    return
  fi
  
  case "$command" in
    create-config)
      case "$prev" in
        -t|--template) __snappercomp "$( ls /etc/snapper/config-templates )" ;;
        -f|--fstype)   __snappercomp "btrfs ext4 lvm" ;;
        *)             __snappercomp "-f --fstype -t --template" ;;
      esac
      ;;
    delete-config) ;;
    get-config) ;;
    set-config)
      __snappercomp "$settings"
      ;;
    list)
      case "$prev" in
        -t|--type)  __snappercomp "all single pre-post" ;;
        *)          __snappercomp "-t --type" ;;
      esac
      ;;
    create)
      case "$prev" in
        -t|--type)              __snappercomp "single pre post" ;;
        -c|--cleanup-algorithm) __snappercomp "number timeline empty-pre-post" ;;
        *)                      __snappercomp "-t --type --pre-number \
                                  -p --print-number -d --description \
                                  -c --cleanup-algorithm -u --user-data"
          ;;
      esac
      ;;
    modify)
      case "$prev" in
        -c|--cleanup-algorithm) __snappercomp "number timeline empty-pre-post" ;;
        *)                      __snappercomp "-d --description -c --cleanup-algorithm \
                                  -u --user-data" ;;
      esac
      ;;
    delete)
      ;;
    mount) ;;
    umount) ;;
    status)
      case "$prev" in
        -o|--output) _filedir ;;
        *)           __snappercomp "-o --output" ;;
      esac
      ;;
    diff)
      _filedir
      ;;
    xadiff)
      _filedir
      ;;
    undochange)
      case "$prev" in
        -i|--input) _filedir ;;
        *)          __snappercomp "-i --input" ;;
      esac
      ;;
    cleanup)
      __snappercomp "number timeline pre-post"
      ;;
    *) COMPREPLY=() ;;
  esac
}

complete -o default -F _snapper snapper

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