fzf-scripts/fzmp

#!/usr/bin/env bash

declare -r esc=$(printf '\033')
declare -r c_reset="${esc}[0m"
declare -r c_red="${esc}[31m"
declare -r track_format='[[[%artist% / ][[(%date%) ]%album% / ][%track%] - [%title%]]|%file%]'

usage() {
  LESS=-FEXR less <<HELP
fzmp [OPTIONS]

  -A --all       search all songs in the library (or F1 when running)
  -a --artist    search artist then filter by album (or F2 when running)
  -p --playlist  search the current playlist (or F3 when running)
  -h --help      print this help
HELP
}

isRunning() {
  pgrep "$1" &> /dev/null
}

err() {
  printf "${c_red}%s${c_reset}\n" "$*" >&2
}

die() {
  [[ -n "$1" ]] && err "$*"
  exit 1
}

has() {
  local verbose=false
  if [[ $1 == '-v' ]]; then
    verbose=true
    shift
  fi
  for c in "$@"; do c="${c%% *}"
    if ! command -v "$c" &> /dev/null; then
      [[ "$verbose" == true ]] && err "$c not found"
      return 1
    fi
  done
}

fzf() {
  command fzf -e -i --reverse --cycle --inline-info "$@"
}

filterAllSongs() {
  local choice
  mapfile -t choice < <( mpc search -f "%file%\t$track_format" filename '' |
    fzf --multi \
      --with-nth='2..' \
      --delimiter='\t' \
      --expect='f2,f3,enter' |
    cut -f1)
  case "${choice[0]}" in
    'f2') filterByArtist ;;
    'f3') filterPlaylist ;;
    'enter') printf '%s\n' "${choice[@]:1}" | playSongs ;;
  esac
}

filterByArtist() {
  local choice
  mapfile -t choice < <(mpc list artist | sort -h | fzf --expect='f1,f3,enter')
  (( "${#choice[@]}" > 0 )) || die
  case "${choice[0]}" in
    'f1') filterAllSongs ;;
    'f3') filterPlaylist ;;
    'enter') filterByAlbumFromArtist "${choice[1]}" ;;
  esac
}

filterByAlbumFromArtist() {
  local album artist choice
  [[ -z "$1" ]] && filterByArtist
  artist="$1"
  mapfile -t choice < <(mpc search -f '[(%date%)\t][%album%]' artist "${artist}" |
    sort -h | uniq |
    fzf --prompt="$artist > " \
      --expect='f1,f3,enter' \
      --bind='Ctrl-A:select-all' |
      cut -f2)
  case "${choice[0]}" in
    'f1') filterAllSongs ;;
    'f3') filterPlaylist ;;
    'enter') filterSongsFromAlbum "$artist" "${choice[1]}" ;;
    *) filterByArtist ;;
  esac
}

filterSongsFromAlbum() {
  local album artist choice
  [[ -z "$1" || -z "$2" ]] && die
  artist="$1"
  album="$2"
  mapfile -t choice < <(mpc search -f '%file%\t[[[%track% - ][%title%]]|%file%]' artist "${artist}" album "${album}" |
    fzf --prompt="$artist - $album > " \
      --multi \
      --with-nth='2..' \
      --delimiter='\t' \
      --expect='f1,f3,enter' \
      --bind='Ctrl-A:select-all' |
    cut -f1)
  case "${choice[0]}" in
    'f1') filterAllSongs ;;
    'f3') filterPlaylist ;;
    'enter') printf '%s\n' "${choice[@]:1}" | playSongs ;;
    *) filterByAlbumFromArtist "$artist" ;;
  esac
}

filterPlaylist() {
  local choice 
  current_song=$(mpc current -f "$track_format")
  mapfile -t choice < <(mpc playlist -f "%position%\t$track_format" |
    fzf --prompt='playlist > ' \
      --multi \
      ${current_song:+--header="now playing: ${current_song}"} \
      --delimiter='\t' \
      --with-nth='2..' \
      --expect='f1,f2,>,<,ctrl-d,enter' |
    cut -f1) || die
  case "${choice[0]}" in
    'f1') filterAllSongs ;;
    'f2') filterByArtist ;;
    '>') mpc -q next ; filterPlaylist ;;
    '<') mpc -q prev ; filterPlaylist ;;
    'ctrl-d') [[ -n "${choice[1]}" ]] && mpc -q del "${choice[@]:1}" ; filterPlaylist ;;
    'enter') [[ -n "${choice[1]}" ]] && mpc -q play "${choice[@]:1}" ; filterPlaylist ;;
  esac
}

playSongs() {
  mapfile -t songs
  (( "${#songs[@]}" > 0 )) || die
  printf '%s\n' "${songs[@]}" | mpc -q add
  index=$(mpc playlist | wc -l)
  (( ${#songs[@]} > 1 )) &&
    index=$(( index - ${#songs[@]} + 1))
  mpc -q play "$index"
  filterPlaylist
}

declare filter='filterAllSongs'
while :; do
  case "$1" in
    -A|--all) filter='filterAllSongs' ; shift ;;
    -a|--artist) filter='filterByArtist' ; shift ;;
    -p|--playlist) filter='filterPlaylist' ; shift ;;
    -h|--help) usage ; exit ;;
    *) break
  esac
done

has -v fzf mpc || die
isRunning mpd || [[ -n "$MPD_HOST" ]] || die "can't connect to mpd"

$filter