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#compdef mpc -value-,MPD_HOST,-default

local OUT foo MPD_MUSIC_DIR MPC_PLAYLIST_MATCHER MPC_FORMAT_STRING

# set this style to whatever --format string you want to use when
# constructing the list of playlist entries
zstyle -s ":completion:${curcontext}:*" mpc-format-string MPC_FORMAT_STRING
foo=(--format "${(q)MPC_FORMAT_STRING:-%file%}")

# set this style to the music_directory of mpd to get _files based completion
# for commands like "add"
zstyle -s ":completion:${curcontext}:" mpd-music-directory MPD_MUSIC_DIR

# matcher used for playlist completion
zstyle -s ":completion:${curcontext}:" mpd-playlist-matcher \
  MPC_PLAYLIST_MATCHER
: ${MPC_PLAYLIST_MATCHER:='m:{a-z}={A-Z} l:|=**'}

# this one is used to configure the behaviour of _mpc_helper_songnumbers,
# see _pids for the original
zstyle -s ":completion:${curcontext}:song-numbers" insert-song-numbers \
  OUT || OUT=single

_mpc_command() {
  local mpc_cmds

  mpc_cmds=(
    add:"append a song to the end of the current playlist"
    cdprev:"compact disk player-like previous command"
    channels:"list the channels that other clients have subscribed to"
    clear:"clear the current playlist"
    clearerror:"clear the current error"
    crop:"remove all songs except for the currently playing song"
    current:"show the currently playing song"
    crossfade:"set and display crossfade settings"
    del:"remove a song from the current playlist"
    disable:"disable an output"
    enable:"enable an output"
    toggleoutput:"toggle an output"
    idle:"wait until an event occurs"
    idleloop:"loop waiting for events"
    insert:"insert a song after the currently playing song in the playlist"
    listall:"list all songs in the music directory"
    load:"load file as a playlist"
    ls:"list the contents of specified directory"
    lsplaylists:"list currently available playlists"
    mixrampdb:"set and display mixrampdb settings"
    mixramdelay:"set and display mixrampdelay settings"
    move:"move song in playlist"
    next:"play the next song in the current playlist"
    outputs:"show the current outputs"
    pause:"pause the currently playing song"
    play:"start playing"
    playlist:"print the current playlist"
    prev:"play the previous song in the current playlist"
    prio:"change song priorities in the queue"
    random:"toggle random mode, or specify state"
    repeat:"toggle repeat mode, or specify state"
    single:"toggle single mode, or specify state"
    consume:"toggle consume mode, or specify state"
    replaygain:"set or display the replay gain mode"
    rm:"remove a playlist"
    save:"save a playlist to file"
    search:"search for a song"
    searchadd:"search songs and add them to the current playlist"
    searchplay:"search and play songs from the current playlist"
    find:"search for a song, exact match"
    findadd:"find songs and add them to the current playlist"
    list:"list all tags of given type"
    seek:"seek to the position specified in percent"
    shuffle:"shuffle the current playlist"
    stats:"display statistics about MPD"
    stop:"stop the currently playing playlists"
    toggle:"toggles Play/Pause, plays if stopped"
    update:"scan music directory for updates"
    version:"report version of MPD"
    volume:"set volume"
    status:"display MPD status"
    sendmessage:"send a message to the specified channel"
    waitmessage:"wait for at least one message on the specified channel"
    subscribe:"subscribe to the specified channel and continuously receive messages"
    sticker:"sticker management"
  )

  if (( CURRENT == 1 )); then
    _describe -t commands "mpc command" mpc_cmds || \
        _wanted commands expl "mpc command" compadd loadtab tab lstab
  else
    local cmd=$words[1]
    local curcontext="${curcontext%:*:*}:mpc-${cmd}:" ret=1
    if ! _call_function ret _mpc_$cmd; then
      _default && ret=0
    fi
    return ret
  fi
}

_mpc_helper_bool() {
  local expl states
  states=(on off yes no 1 0 true false)
  _wanted states expl boolean compadd -a states
}

(( $+functions[_mpc_helper_songnumbers] )) ||
_mpc_helper_songnumbers() {
  local out sn list expl MATCH desc all NM ret=1

  _tags song-numbers || return 1

  if [[ "$PREFIX" = [0-9]# ]]; then
    all=()
    MATCH="*${(Q)PREFIX}[0-9]#*"
  else
    all=(-U)
    MATCH="(#i)*${(Q)PREFIX}*"
    NM="$compstate[nmatches]"
  fi

  out=("${(@f)$(_call_program song-numbers $mpccmd $foo playlist)}")
  out=("${(@M)out[@]:#${~MATCH}}")

  sn=("${(@)${(@M)out}//(#b)(#s)(\#|[ >]#)([0-9]#)*/$match[2]}")
  list=("${(@Mr:COLUMNS-1:)out}")

  _wanted -V song-numbers expl 'song number' \
      compadd "$@" -ld list "$all[@]" -a sn && ret=0

  if [[ -n "$all" ]]; then
    case "$OUT" in
      menu)
        compstate[insert]=menu
        ;;
      single)
        [[ $compstate[nmatches] -ne NM+1 ]] &&
        compstate[insert]=
        ;;
      *)
        [[ ${#:-$PREFIX} -gt ${#compstate[unambiguous]} ]] &&
        compstate[insert]=menu
        ;;
    esac
  fi

  return ret
}

(( $+functions[_mpc_helper_playlists] )) ||
_mpc_helper_playlists() {
  local list expl
  list=(${(f)"$(_call_program playlists $mpccmd lsplaylists)"})
  _wanted playlists expl playlist compadd -M $MPC_PLAYLIST_MATCHER $expl -a list
}

(( $+functions[_mpc_helper_files] )) ||
_mpc_helper_files() {
  if [[ -n $MPD_MUSIC_DIR ]]; then
    _files -W $MPD_MUSIC_DIR
    return
  fi

  local -U list expl prefix=$PREFIX
  if [[ $words[CURRENT] != */* ]]; then
    list=( ${${(f)"$(_call_program files $mpccmd listall)"}%%/*})
    _wanted files expl file compadd -qS/ -a list
  else
    [[ $compstate[quote] = [\'\"] ]] && prefix="$compstate[quote]$PREFIX$compstate[quote]"
    list=(${(f)"$($mpccmd tab -- ${(Q)prefix} 2>/dev/null)"})
    _wanted files expl file _multi_parts / list
  fi
}

(( $+functions[_mpc_helper_directories] )) ||
_mpc_helper_directories() {
  if [[ -n $MPD_MUSIC_DIR ]]; then
    _files -/ -W $MPD_MUSIC_DIR
    return
  fi

  local -U list expl prefix=$PREFIX
  if [[ $words[CURRENT] != */* ]]; then
    list=( ${${(M)${(f)"$(_call_program directories $mpccmd listall)"}:#*/*}%%/*})
    _wanted directories expl directory compadd -qS/ -a list
  else
    [[ $compstate[quote] = [\'\"] ]] && prefix="$compstate[quote]$PREFIX$compstate[quote]"
    list=(${(f)"$($mpccmd lstab -- ${(Q)prefix} 2>/dev/null)"})
    _wanted directories expl directory _multi_parts / list
  fi
}

(( $+functions[_mpc_helper_outputs] )) ||
_mpc_helper_outputs() {
  local vals outline
  vals=(${${${${(M)${(f)"$(_call_program outputs $mpccmd outputs)"}:#Output * \(*\) is (en|dis)abled}##Output }%%\) is (en|dis)abled}/ \(/:})
  _describe -t outputs output vals
}

_mpc_add() {
  _mpc_helper_files
}

_mpc_del() {
  _mpc_helper_songnumbers
}

_mpc_play() {
  _mpc_helper_songnumbers
}

_mpc_seek() {
  _message "floating point percent value"
}

_mpc_enable() {
  _mpc_helper_outputs
}

_mpc_disable() {
  _mpc_helper_outputs
}

_mpc_toggleoutput() {
  _mpc_helper_outputs
}

_mpc_move() {
  if (( $#words <= 3 )); then
    _mpc_helper_songnumbers
  else
    _message "nothing"
  fi
}

_mpc_listall() {
  _mpc_helper_files
}

_mpc_ls() {
  _mpc_helper_directories
}

_mpc_lstab() {
  _mpc_helper_directories
}

_mpc_load() {
  _mpc_helper_playlists
}

_mpc_loadtab() {
  _mpc_helper_playlists
}

_mpc_save() {
  _mpc_helper_playlists
}

_mpc_tab() {
  _mpc_helper_files
}

_mpc_rm() {
  _mpc_helper_playlists
}

_mpc_volume() {
  local expl value="${${$(_call_program volume $mpccmd volume)#*:}%\%}" ret=1
  if [[ -prefix \+ && $value -lt 100 ]]; then
    _wanted -V volume expl volume compadd $expl - +{1..$((100-value))} && ret=0
  elif [[ -prefix - && $value -gt 0 ]]; then
    _wanted -V volume expl volume compadd $expl - -{1..$value} && ret=0
  else
    _wanted -V volume expl volume compadd $expl - {0..100} && ret=0
    compstate[insert]=menu:$((value+1))
  fi
  return ret
}

_mpc_repeat() {
  _mpc_helper_bool
}

_mpc_random() {
  _mpc_helper_bool
}

_mpc_single() {
  _mpc_helper_bool
}

_mpc_consume() {
  _mpc_helper_bool
}

_mpc_current() {
  _arguments --wait
}

_mpc_search() {
  local list expl
  list=(album artist title track name genre date composer performer comment disc filename any)

  if ! (( $#words % 2 )); then
    _wanted list expl table compadd $expl -a list
  else
    _message "pattern"
  fi
}

_mpc_find() {
  _mpc_search "$@"
}

_mpc_list() {
  _mpc_search "$@"
}

_mpc_update() {
  _mpc_helper_files
}

if [[ $service = *MPD_HOST* ]]; then
  _hosts
  return
fi

local curcontext="$curcontext" state line expl ret=1
local mpccmd="$words[1]"

_arguments -C \
  '(-q --quiet --no-status -v --verbose)'{-v,--verbose}'[give verbose output]' \
  '(-q --quiet --no-status -v --verbose)'{-q,--quiet,--no-status}'[prevent printing song status on completion]' \
  '(-h --host)'{-h,--host=}'[connect to specified host]:_hosts' \
  '(-p --port)'{-p,--port=}'[connect to server port]:port' \
  '(-f --format)'{-f,--format=}'[specify the format of song display]:format string:->formats' \
  '(-w --wait)'{-w,--wait}'[wait for operation to finish (e.g. database update)]' \
  '*::mpc command:_mpc_command' && ret=0

if [[ $state = formats ]]; then
  compset -P '([^%]|%[^%]#%)#'
  _wanted metadata expl 'metadata delimiter' compadd -p % -S % \
    artist album albumartist comment composer date disc genre performer title \
    track time file position mtime mdate && ret=0
fi

return ret
debug log:

solving 45d93550d ...
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