beeper

#!/usr/bin/env bash

# Set strict mode
#set -euo pipefail

# Main function wrapper
main() {
  # Check if common-functions exists
  if [[ ! -f "$(dirname "$0")/common-functions" ]]; then
    echo "Downloading common-functions from GitHub..."
    if ! curl -fsSL https://raw.githubusercontent.com/Flower7C3/bash-tools/master/common-functions -o "$(dirname "$0")/common-functions"; then
      echo "Failed to download common-functions"
      exit 1
    fi
  fi

  # Source common functions
  source "$(dirname "$0")/common-functions"

  # Call the actual main function
  beeper_main "$@"
}

beeper_main() {
  function show_usage() {
    log_usage_title '[OPTIONS]'
    echo
    log_header 'Options'
    log_usage_options_line '-t;--type <int>' \
      'note type; integer; 16=whole, 8=half, 4=quarter, 2=eighth, 1=sixteenth'
    log_usage_options_line '-s;--speed <int>' \
      'note speed; integer; from 30 to 500'
    log_usage_options_line '-o;--octave <int>' \
      'note octave; integer; from 1 to 9'
    log_usage_options_line '-f;--file <path>' \
      'filepath of tabs'
    log_usage_options_line '-v;--verbose' \
      'verbose setters'
    log_usage_options_line '-u;--update' \
      'Update app'
    log_usage_options_line '-h;--help' \
      'show this help'
    exit 0
  }
  function show_commands() {
    log_header 'Tempo'
    log_usage_options_line ---width 14 'arrow right' \
      'Tempo speed up'
    log_usage_options_line ---width 14 'arrow left' \
      'Tempo speed down'
    log_header 'Octave'
    log_usage_options_line ---width 14 'arrow up' \
      'Octave change up'
    log_usage_options_line ---width 14 'arrow down' \
      'Octave change down'
    log_header 'Note type'
    log_usage_options_line ---width 14 '1' "set sixteenth $MUSIC_NOTE_SIXTEENTH"
    log_usage_options_line ---width 14 '2' "set eighth $MUSIC_NOTE_EIGHTH"
    log_usage_options_line ---width 14 '3' "set quarter $MUSIC_NOTE_QUARTER"
    log_usage_options_line ---width 14 '4' "set half $MUSIC_NOTE_HALF"
    log_usage_options_line ---width 14 '5' "set whole $MUSIC_NOTE_WHOLE"
    log_header 'Note play'
    log_usage_options_line ---width 14 '`' 'Play pause'
    log_usage_options_line ---width 14 '🅉' "Play note <b>c</b>"
    log_usage_options_line ---width 14 '🅂' "Play note <b>c$MUSIC_SIGN_SHARP</b> / <b>d$MUSIC_SIGN_FLAT</b>"
    log_usage_options_line ---width 14 '🅇' "Play note <b>d</b>"
    log_usage_options_line ---width 14 '🄳' "Play note <b>d$MUSIC_SIGN_SHARP</b> / <b>e$MUSIC_SIGN_FLAT</b>"
    log_usage_options_line ---width 14 '🄲' "Play note <b>e</b>"
    log_usage_options_line ---width 14 '🅅' "Play note <b>f</b>"
    log_usage_options_line ---width 14 '🄶' "Play note <b>f$MUSIC_SIGN_SHARP</b> / <b>g$MUSIC_SIGN_FLAT</b>"
    log_usage_options_line ---width 14 '🄱' "Play note <b>g</b>"
    log_usage_options_line ---width 14 '🄷' "Play note <b>g$MUSIC_SIGN_SHARP</b> / <b>a$MUSIC_SIGN_FLAT</b>"
    log_usage_options_line ---width 14 '🄽' "Play note <b>a</b>"
    log_usage_options_line ---width 14 '🄹' "Play note <b>a$MUSIC_SIGN_SHARP</b> / <b>b$MUSIC_SIGN_FLAT</b>"
    log_usage_options_line ---width 14 '🄼' "Play note <b>b</b>"
    log_usage_options_line ---width 14 ',' "Play note <b>c</b>"
    log_usage_options_line ---width 14 'Shift + <note key>' 'Play note with Led.'
  }

  ### NOTES ###
  # notes, see https://en.wikipedia.org/wiki/Scientific_pitch_notation
  readonly NOTE_A_0=27.500
  readonly NOTE_A_SHARP_0=29.135
  readonly NOTE_B_FLAT_0=29.135
  readonly NOTE_B_0=30.868
  readonly NOTE_C_FLAT_1=30.868
  readonly NOTE_B_SHARP_0=32.703
  readonly NOTE_C_1=32.703
  readonly NOTE_C_SHARP_1=34.648
  readonly NOTE_D_FLAT_1=34.648
  readonly NOTE_D_1=36.708
  readonly NOTE_D_SHARP_1=38.891
  readonly NOTE_E_FLAT_1=38.891
  readonly NOTE_E_1=41.203
  readonly NOTE_E_SHARP_1=43.654
  readonly NOTE_F_FLAT_1=41.203
  readonly NOTE_F_1=43.654
  readonly NOTE_F_SHARP_1=46.249
  readonly NOTE_G_FLAT_1=46.249
  readonly NOTE_G_1=48.999
  readonly NOTE_G_SHARP_1=51.913
  readonly NOTE_A_FLAT_1=51.913
  readonly NOTE_A_1=55.000
  readonly NOTE_A_SHARP_1=58.270
  readonly NOTE_B_FLAT_1=58.270
  readonly NOTE_B_1=61.735
  readonly NOTE_C_FLAT_2=61.735
  readonly NOTE_B_SHARP_1=65.406
  readonly NOTE_C_2=65.406
  readonly NOTE_C_SHARP_2=69.296
  readonly NOTE_D_FLAT_2=69.296
  readonly NOTE_D_2=73.416
  readonly NOTE_D_SHARP_2=77.782
  readonly NOTE_E_FLAT_2=77.782
  readonly NOTE_E_2=82.407
  readonly NOTE_E_SHARP_2=87.307
  readonly NOTE_F_FLAT_2=82.407
  readonly NOTE_F_2=87.307
  readonly NOTE_F_SHARP_2=92.499
  readonly NOTE_G_FLAT_2=92.499
  readonly NOTE_G_2=97.999
  readonly NOTE_G_SHARP_2=103.826
  readonly NOTE_A_FLAT_2=103.826
  readonly NOTE_A_2=110.000
  readonly NOTE_A_SHARP_2=116.541
  readonly NOTE_B_FLAT_2=116.541
  readonly NOTE_B_2=123.471
  readonly NOTE_C_FLAT_3=123.471
  readonly NOTE_B_SHARP_2=130.813
  readonly NOTE_C_3=130.813
  readonly NOTE_C_SHARP_3=138.591
  readonly NOTE_D_FLAT_3=138.591
  readonly NOTE_D_3=146.832
  readonly NOTE_D_SHARP_3=155.564
  readonly NOTE_E_FLAT_3=155.564
  readonly NOTE_E_3=164.814
  readonly NOTE_E_SHARP_3=174.614
  readonly NOTE_F_FLAT_3=164.814
  readonly NOTE_F_3=174.614
  readonly NOTE_F_SHARP_3=184.997
  readonly NOTE_G_FLAT_3=184.997
  readonly NOTE_G_3=195.998
  readonly NOTE_G_SHARP_3=207.652
  readonly NOTE_A_FLAT_3=207.652
  readonly NOTE_A_3=220.000
  readonly NOTE_A_SHARP_3=233.082
  readonly NOTE_B_FLAT_3=233.082
  readonly NOTE_B_3=246.942
  readonly NOTE_C_FLAT_4=246.942
  readonly NOTE_B_SHARP_3=261.626
  readonly NOTE_C_4=261.626
  readonly NOTE_C_SHARP_4=277.183
  readonly NOTE_D_FLAT_4=277.183
  readonly NOTE_D_4=293.665
  readonly NOTE_D_SHARP_4=311.127
  readonly NOTE_E_FLAT_4=311.127
  readonly NOTE_E_4=329.628
  readonly NOTE_E_SHARP_4=349.228
  readonly NOTE_F_FLAT_4=329.628
  readonly NOTE_F_4=349.228
  readonly NOTE_F_SHARP_4=369.994
  readonly NOTE_G_FLAT_4=369.994
  readonly NOTE_G_4=391.995
  readonly NOTE_G_SHARP_4=415.305
  readonly NOTE_A_FLAT_4=415.305
  readonly NOTE_A_4=440.000
  readonly NOTE_A_SHARP_4=466.164
  readonly NOTE_B_FLAT_4=466.164
  readonly NOTE_B_4=493.883
  readonly NOTE_C_FLAT_5=493.883
  readonly NOTE_B_SHARP_4=523.251
  readonly NOTE_C_5=523.251
  readonly NOTE_C_SHARP_5=554.365
  readonly NOTE_D_FLAT_5=554.365
  readonly NOTE_D_5=587.330
  readonly NOTE_D_SHARP_5=622.254
  readonly NOTE_E_FLAT_5=622.254
  readonly NOTE_E_5=659.255
  readonly NOTE_E_SHARP_5=698.457
  readonly NOTE_F_FLAT_5=659.255
  readonly NOTE_F_5=698.457
  readonly NOTE_F_SHARP_5=739.989
  readonly NOTE_G_FLAT_5=739.989
  readonly NOTE_G_5=783.991
  readonly NOTE_G_SHARP_5=830.609
  readonly NOTE_A_FLAT_5=830.609
  readonly NOTE_A_5=880.000
  readonly NOTE_A_SHARP_5=932.328
  readonly NOTE_B_FLAT_5=932.328
  readonly NOTE_B_5=987.767
  readonly NOTE_C_FLAT_6=987.767
  readonly NOTE_B_SHARP_5=1046.502
  readonly NOTE_C_6=1046.502
  readonly NOTE_C_SHARP_6=1108.731
  readonly NOTE_D_FLAT_6=1108.731
  readonly NOTE_D_6=1174.659
  readonly NOTE_D_SHARP_6=1244.508
  readonly NOTE_E_FLAT_6=1244.508
  readonly NOTE_E_6=1318.510
  readonly NOTE_E_SHARP_6=1396.913
  readonly NOTE_F_FLAT_6=1318.510
  readonly NOTE_F_6=1396.913
  readonly NOTE_F_SHARP_6=1479.978
  readonly NOTE_G_FLAT_6=1479.978
  readonly NOTE_G_6=1567.982
  readonly NOTE_G_SHARP_6=1661.219
  readonly NOTE_A_FLAT_6=1661.219
  readonly NOTE_A_6=1760.000
  readonly NOTE_A_SHARP_6=1864.655
  readonly NOTE_B_FLAT_6=1864.655
  readonly NOTE_B_6=1975.533
  readonly NOTE_C_FLAT_7=1975.533
  readonly NOTE_B_SHARP_6=2093.005
  readonly NOTE_C_7=2093.005
  readonly NOTE_C_SHARP_7=2217.461
  readonly NOTE_D_FLAT_7=2217.461
  readonly NOTE_D_7=2349.318
  readonly NOTE_D_SHARP_7=2489.016
  readonly NOTE_E_FLAT_7=2489.016
  readonly NOTE_E_7=2637.021
  readonly NOTE_E_SHARP_7=2793.826
  readonly NOTE_F_FLAT_7=2637.021
  readonly NOTE_F_7=2793.826
  readonly NOTE_F_SHARP_7=2959.956
  readonly NOTE_G_FLAT_7=2959.956
  readonly NOTE_G_7=3135.964
  readonly NOTE_G_SHARP_7=3322.438
  readonly NOTE_A_FLAT_7=3322.438
  readonly NOTE_A_7=3520.000
  readonly NOTE_A_SHARP_7=3729.310
  readonly NOTE_B_FLAT_7=3729.310
  readonly NOTE_B_7=3951.066
  readonly NOTE_C_FLAT_8=3951.066
  readonly NOTE_B_SHARP_7=4186.009
  readonly NOTE_C_8=4186.009
  readonly NOTE_C_SHARP_8=4434.922
  readonly NOTE_D_FLAT_8=4434.922
  readonly NOTE_D_8=4698.637
  readonly NOTE_D_SHARP_8=4978.032
  readonly NOTE_E_FLAT_8=4978.032
  readonly NOTE_E_8=5274.042
  readonly NOTE_E_SHARP_8=5587.652
  readonly NOTE_F_FLAT_8=5274.042
  readonly NOTE_F_8=5587.652
  readonly NOTE_F_SHARP_8=5919.912
  readonly NOTE_G_FLAT_8=5919.912
  readonly NOTE_G_8=6271.928
  readonly NOTE_G_SHARP_8=6644.876
  readonly NOTE_A_FLAT_8=6644.876
  readonly NOTE_A_8=7040.000
  readonly NOTE_A_SHARP_8=7458.620
  readonly NOTE_B_FLAT_8=7458.620
  readonly NOTE_B_8=7902.133
  readonly NOTE_C_FLAT_9=7902.133
  readonly NOTE_B_SHARP_8=8372.019
  readonly NOTE_C_9=8372.019
  readonly NOTE_C_SHARP_9=8869.845
  readonly NOTE_D_FLAT_9=8869.845
  readonly NOTE_D_9=9397.273
  readonly NOTE_D_SHARP_9=9956.064
  readonly NOTE_E_FLAT_9=9956.064
  readonly NOTE_E_9=10548.083
  readonly NOTE_E_SHARP_9=11175.305
  readonly NOTE_F_FLAT_9=10548.083
  readonly NOTE_F_9=11175.305
  readonly NOTE_F_SHARP_9=11839.823
  readonly NOTE_G_FLAT_9=11839.823
  readonly NOTE_G_9=12543.855
  readonly NOTE_G_SHARP_9=13289.752
  readonly NOTE_A_FLAT_9=13289.752
  readonly NOTE_A_9=14080.00
  readonly NOTE_A_SHARP_9=14917.24
  readonly NOTE_B_FLAT_9=14917.24
  readonly NOTE_B_9=15804.27
  readonly NOTE_C_1FLAT_0=15804.27
  readonly NOTE_B_SHARP_9=16744.04
  readonly NOTE_C_10=16744.04

  ### SYMBOLS ###
  readonly MUSIC_NOTE_SIXTEENTH="\u266C "
  readonly MUSIC_NOTE_EIGHTH="\u266A "
  readonly MUSIC_NOTE_EIGHTH_EXTENDED="\u266A."
  readonly MUSIC_NOTE_QUARTER="\u2669 "
  readonly MUSIC_NOTE_QUARTER_EXTENDED="\u2669."
  readonly MUSIC_NOTE_HALF="\u2af0 "
  readonly MUSIC_NOTE_HALF_EXTENDED="\u2af0."
  readonly MUSIC_NOTE_WHOLE="\u26AC "
  readonly MUSIC_NOTE_WHOLE_EXTENDED="\u26AC."

  readonly MUSIC_CLEF_G='𝄞'          # \xF0\x9D\x84\x9E
  readonly MUSIC_SIGN_FLAT="\u266D"  # \xe2\x99\xad
  readonly MUSIC_SIGN_NATURAL='♮'    # \xe2\x99\xae
  readonly MUSIC_SIGN_SHARP="\u266F" # \xe2\x99\xaf

  readonly OCTAVE_SIGNS=(₂ ₁ "" ⁰ ¹ ² ³ ⁴ ⁵)
  readonly OCTAVE_NAMES=(subcontra contra major minor one-line two-line three-line four-line five-line)

  ### CONFIG ###
  command_pattern_normal=''
  command_pattern_sustain=''
  time_mode=''
  command_name=''
  notes_file_name=''
  note_sustain='n'
  note_tone_key=''
  note_tone_name=''
  note_tone_freq=''
  note_octave_no=''
  note_type_id='4'
  note_type_icon=''
  note_speed='60'
  note_length_ms=''
  note_length_sec=''
  force_stop='n'

  ### BEEPER ###
  function reset_note() {
    note_sustain='n'
    note_tone_key=''
  }

  function set_note_sustain() {
    note_sustain='y'
  }

  function update_note_length() {
    note_length_ms=$(echo "scale=3; $note_type_id/4 * 1000 * 60/$note_speed" | bc -l)
    note_length_sec=$(echo "scale=3; $note_length_ms/1000" | bc -l)
  }

  function set_note_type() {
    note_type_id="$1"
    if (($(echo "$note_type_id <= 0" | bc -l))); then
      note_type_id='1'
    fi
    if (($(echo "$note_type_id > 16" | bc -l))); then
      note_type_id='16'
    fi
    local _note_length_name
    case "$note_type_id" in
    24) _note_length_name='WHOLE_EXTENDED' ;;
    16) _note_length_name='WHOLE' ;;
    12) _note_length_name='HALF_EXTENDED' ;;
    8) _note_length_name='HALF' ;;
    6) _note_length_name='QUARTER_EXTENDED' ;;
    4 | "4/3") _note_length_name='QUARTER' ;;
    3) _note_length_name='EIGHTH_EXTENDED' ;;
    2 | "2/3") _note_length_name='EIGHTH' ;;
    1) _note_length_name='SIXTEENTH' ;;
    esac
    local _icon_key="MUSIC_NOTE_${_note_length_name}"
    note_type_icon="$(echo -e "${!_icon_key}")"
    update_note_length
    log_debug ---reset 'Set note type as <b>%s</b> %s (%s ms)' "${_note_length_name,,}" "$note_type_icon" "$note_length_ms"
  }

  function set_note_speed() {
    local _speed="$1"
    if [[ "$_speed" -lt '30' ]]; then
      _speed='30'
    fi
    if [[ "$_speed" -gt '500' ]]; then
      _speed='500'
    fi
    note_speed="$_speed"
    update_note_length
    log_debug ---reset 'Set speed as <b>%s</b>' "$note_speed"
  }

  function set_note_octave() {
    note_octave_no="$1"
    if [[ "$note_octave_no" -lt '1' ]]; then
      note_octave_no='1'
    fi
    if [[ "$note_octave_no" -gt '9' ]]; then
      note_octave_no='9'
    fi
    log_debug ---reset 'Set octave as <b>%s</b> (%d)' "${OCTAVE_NAMES[$((note_octave_no - 1))]}" "$note_octave_no"
  }

  function set_note_tone() {
    local _tone_key="${1:0:1}"
    local _tone_mod="${1:0-1}"
    if [[ "$note_octave_no" -lt "4" ]]; then
      note_tone_name="${_tone_key^^}"
    else
      note_tone_name="${_tone_key,,}"
    fi
    note_tone_key="${_tone_key^^}"
    if [[ "$_tone_mod" == "-" ]]; then
      note_tone_name+="$(echo -e $MUSIC_SIGN_FLAT)"
      note_tone_key+="_FLAT"
    elif [[ "$_tone_mod" == "+" ]]; then
      note_tone_name+="$(echo -e $MUSIC_SIGN_SHARP)"
      note_tone_key+="_SHARP"
    fi
    note_tone_name+="${OCTAVE_SIGNS[$((note_octave_no - 1))]}"

  }

  function play_value() {
    if [[ "$note_tone_key" == 'p' || "$note_tone_key" == 'P' ]]; then
      play_pause
    else
      local _frequency_key="NOTE_${note_tone_key}_${note_octave_no}"
      note_tone_freq="${!_frequency_key}"
      play_note
    fi
  }

  function play_pause() {
    local _suffix=""
    if [[ "$note_sustain" == 'y' ]]; then
      _suffix="Led."
    fi
    printf "$(tput setaf 3)%6.3s ms %s %s" "${note_length_ms/./,}" "${note_type_icon}p" "$_suffix"
    if [[ "$note_sustain" == 'y' ]]; then
      sleep "$note_length_sec" &
    else
      sleep "$note_length_sec"
    fi
    echo -e "$(styler reset)"
  }

  function play_note() {
    local _time="0"
    if [[ "$time_mode" == "ms" ]]; then
      _time="$note_length_ms"
    elif [[ "$time_mode" == "sec" ]]; then
      _time="$note_length_sec"
    fi
    local _suffix=""
    if [[ "$note_sustain" == 'y' ]]; then
      _suffix="Led."
    fi
    printf "$(tput setaf 3)%6.1fms %s %8.2fHz %s %s" "${note_length_ms/./,}" "$note_type_icon" "${note_tone_freq/./,}" "$note_tone_name" "$_suffix"
    if [[ "$note_sustain" == 'y' ]]; then
      # shellcheck disable=SC2059
      eval "$(printf "$command_pattern_sustain" "$_time" "$note_tone_freq")"
    else
      # shellcheck disable=SC2059
      eval "$(printf "$command_pattern_normal" "$_time" "$note_tone_freq")"
    fi
    echo -e "$(styler reset)"
  }

  function main_loop() {
    # FORMAT_RESET
    reset_note
    local _octave_extra='n'
    local _escape_char
    _escape_char=$(printf "\u1b")
    # READ

    read -r -n 1 -p "$(tput setaf 7)$(tput bold)$MUSIC_CLEF_G $(tput setaf 0)" key
    tput sgr0
    if [[ $key == "$_escape_char" ]]; then
      read -rsn2 key # read 2 more chars
    fi
    # octave extra
    if [[ "$key" == ',' ]] || [[ "$key" == '<' ]]; then
      _octave_extra='y'
    fi

    if [[ "$_octave_extra" == 'y' ]]; then
      set_note_octave "$((note_octave_no + 1))"
    fi

    case "$key" in
    # NOTE SPEED
    '[C')
      set_note_speed $((note_speed + 5))
      ;;
    '[D')
      set_note_speed $((note_speed - 5))
      ;;
    # NOTE TYPE
    1) set_note_type 1 ;;
    2) set_note_type 2 ;;
    3) set_note_type 4 ;;
    4) set_note_type 8 ;;
    5) set_note_type 16 ;;
    '[A')
      set_note_octave $((note_octave_no + 1))
      ;;
    '[B')
      set_note_octave $((note_octave_no - 1))
      ;;
    # NOTE TONE
    \`) set_note_tone 'p' ;;
    z | Z) set_note_tone 'c' ;;
    s | S) set_note_tone 'c+' ;;
    x | X) set_note_tone 'd' ;;
    d | D) set_note_tone 'd+' ;;
    c | C) set_note_tone 'e' ;;
    v | V) set_note_tone 'f' ;;
    g | G) set_note_tone 'f+' ;;
    b | B) set_note_tone 'g' ;;
    h | H) set_note_tone 'g+' ;;
    n | N) set_note_tone 'a' ;;
    j | J) set_note_tone 'a+' ;;
    m | M) set_note_tone 'b' ;;
    , | \<) set_note_tone 'c' ;;
    *) printf " \r" ;;
    esac
    # SUSTAIN
    case "$key" in
    Z | S | X | D | C | V | G | B | H | N | J | M | \<)
      set_note_sustain
      ;;
    \?)
      show_commands
      ;;
    esac
    # PLAY
    if [[ "$note_tone_key" != '' ]]; then
      play_value
    fi
    if [[ "$_octave_extra" == 'y' ]]; then
      set_note_octave "$((note_octave_no - 1))"
    fi
  }

  function file_read() {
    local _notes_data
    read -r -a _notes_data <<<"$(grep -v '#' "$notes_file_name" | tr "\n" " ")"
    local _total=${#_notes_data[@]}
    local _index=0
    while true; do
      if [[ "$_index" -ge "$_total" ]] || [[ "$force_stop" == "y" ]]; then
        break
      fi
      reset_note
      local _note_data
      _note_data="${_notes_data[$_index]}"
      local _note_arr
      read -r -a _note_arr <<<"${_note_data/,/ }"
      set_note_type "${_note_arr[1]}"
      set_note_octave "${_note_arr[0]:0-1}"
      set_note_tone "${_note_arr[0]:0:-1}"
      _index=$((_index + 1))
      printf "%4d : " "$_index"
      if [[ -n "${_note_arr[2]:-}" ]]; then
        set_note_sustain
      fi
      play_value
    done
  }

  function config_load() {
    if hash 'beep' 2>/dev/null; then
      command_pattern_normal='beep -l %s -f %s'
      command_pattern_sustain='beep -l %s -f %s &'
      time_mode='ms'
      command_name='beep'
    elif hash 'play' 2>/dev/null; then
      command_pattern_normal='play -q -n -c1 synth %s sine %s'
      command_pattern_sustain='play -q -n -c1 synth %s sine %s &'
      time_mode='sec'
      command_name='play'
    else
      log_error 'Musical command not found! Please install <b>beep</b> (<code>apt install beep</code>) or <b>play</b> (<code>brew install sox</code>).'
      exit 1
    fi
    local _note_type="4"
    local _note_speed="120"
    local _note_octave_no="4"
    while [[ $# -gt 0 ]]; do
      case "$1" in
      -v | --verbose)
        DEBUG=1
        ;;
      -t | --type)
        shift
        _note_type="$1"
        ;;
      -s | --speed)
        shift
        _note_speed="$1"
        ;;
      -o | --octave)
        shift
        _note_octave_no="$1"
        ;;
      -f | --file)
        shift
        notes_file_name="$1"
        ;;
      -h | --help)
        show_usage
        ;;
      -u | --update)
        update_application
        ;;
      -*)
        log_error 'Unknown option: <b>%s</b>' "$1"
        echo
        show_usage
        ;;
      *)
        log_error 'Unexpected argument: <b>%s</b>' "$1"
        echo
        show_usage
        ;;
      esac
      shift
    done
    set_note_speed "$_note_speed"
    set_note_type "$_note_type"
    set_note_octave "$_note_octave_no"
    return 0
  }

  ### TRAP ###
  function finish() {
    log_info ---reset "Bye!"
    force_stop='y'
    killall $command_name 2>/dev/null
    exit 0
  }
  trap 'finish' EXIT

  log_title 'Beeper'

  if ! config_load "$@"; then
    # Help was shown, exit
    return 0
  fi

  log_info 'Press <b>CTRL+C</b> to stop..'
  if [[ "$notes_file_name" != "" ]] && [[ -f $notes_file_name ]]; then
    DEBUG=${DEBUG:-0}
    file_read
  else
    DEBUG=1
    while true; do
      if [[ "$force_stop" == "y" ]]; then
        break
      fi
      main_loop
    done
  fi
}

# Call main function
main "$@"