Skip to content
This repository

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
branch: master
Fetching contributors…

Cannot retrieve contributors at this time

executable file 267 lines (232 sloc) 7.979 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267
#!/usr/bin/ruby
# Simple script that displays the artist and title from shell-fm
# on a DSP-420 LCD screen.
# Scrolls any strings that are longer than their allowed lengths.
# If a string is scrolled, it is padded with 2 spaces to the beginning and end.
# (easier to read)

require 'rubygems'
require 'socket'
require 'yaml'
require File.join(File.dirname(__FILE__), 'lib', 'rubyX2040')
require File.join(File.dirname(__FILE__), 'lib', 'widget')

# Load config.
config = YAML.load_file(File.join(File.dirname(__FILE__), "config.yml"))
Host = config["host"]
Port = config["port"]

Update_delay = 3.0 # Delay between shell.fm refreshes.
Scroll_delay = 0.5 # speed of artist and title scrolling

DisplayUpdateInterval = 0.05 # Poll for refreshes at this interval
BacklightTimeout = 20.0 # Turn off the backlight after a delay

# Gets info from shell-fm
def shellfm_info
  # Gets the 'artist', 'title', and 'remaining seconds'
  cmd = "info %a||%l||%t||%R"
  t = TCPSocket.new(Host, Port)
  t.print cmd + "\n"
  info = t.gets(nil).split("||")
  t.close

  return info.any? ? info : false
  rescue
    # On error, return false
    return false
end
# Sends a cmd to the shellfm network interface.
def shellfmcmd(cmd)
  t = TCPSocket.new(Host, Port)
  t.print cmd + "\n"
  info = t.gets(nil)
  t.close
  return true
  rescue
    false
end

def display_widget(widget)
  $p.message widget.render, widget.pos
end

def splash_screen
  $p.message "shell.fm LCD display", [2,1]
  $p.message "(c) Nathan Broadbent", [3,1]
  sleep 1
  $p.clear
end

def write_static_icons
  $p.write_char($p.icons["guitar"][:loc], [1,1])
  $p.write_char($p.icons["cd"][:loc], [2,1])
  $p.write_char($p.icons["notes"][:loc], [3,1])
end

# Evo T20 is synced to UTC. HK time is UTC +8
def hk_time
  Time.now + 8*60*60
end

# ----------- at_exit code ---------------------

at_exit {
  # When we quit, display a final "bye" message.
  $p.clear
  $p.backlight false
  $p.message "Bye!".center(20), [2,1]
}

# -------------- Script Start -------------------

# initialize DisplayUpdateIntervalPertelian display.
$p = Pertelian.new
# Load in some icons
Dir.glob(File.join(File.dirname(__FILE__), 'lcd_icons', '*.chr')).each_with_index do |filename, i|
  $p.load_char_from_file(filename, i+1)
end

# Display initial splash screen
splash_screen

# ------------------ Paused / Playing Screen --------------

# Set up widgets.
@artist_widget = Widget.new("", [1,3], 18)
@album_widget = Widget.new("", [2,3], 18)
@title_widget = Widget.new("", [3,3], 18)
@remain_widget = Widget.new("", [4,3], 6, :time)
# Variables to detect whether or not the stream is paused.
@status = :playing
@status_cache = nil # cache for checking whether the status has changed from previous iteration
# An icon widget to show the track status
@status_widget = Widget.new("<play>", [4,1], 1, :icons)
@last_remain = 0

@key_info = Widget.new(" <next>:n <pause><play>:p <love>:l <stop>:s ", [4,10], 10, :icons)

def main_widgets
  [@artist_widget, @title_widget, @album_widget, @remain_widget, @key_info, @status_widget]
end

# Static icons for track info
write_static_icons

# Initialize a variable for timing out the backlight.
@backlight_time_left = BacklightTimeout

# ------------------- Stopped Screen -----------------------

@stopped_widget = Widget.new("<stop> Stopped.", [2,1], 20, :icons, :center)

# ------------------- Initialize threads -------------------

# Thread to periodically update our artist/title/remaining time hash and loop.
shellfm_refresh_thread = Thread.new {
  while true
    has_changed = false
    if data = shellfm_info
      [@artist_widget, @title_widget, @album_widget].zip(data[0,3]).each do |widget, value|
        # Reset widget scroll positions if their values have changed.
        if widget.value != value
          widget.value, widget.scroll_pos = value, 1
          has_changed = true
        end
      end
      # Set the remaining track time.
      @remain_widget.value = data[3]

      # Detect whether the stream is paused or not.
      currently_playing = (data[3].to_i > 0 && @last_remain != data[3])
      @last_remain = data[3]
      if @status == :playing
        unless currently_playing
          @status = :paused
          # Update the status icon to 'paused'
          @status_widget.value = "<pause>"
          has_changed = true
        end
      else
        if currently_playing
          @status = :playing
          @status_widget.value = "<play>"
          has_changed = true
        end
      end

    else # else, if shellfm_info method returned false or nil, the track is stopped.
      if @status != :stopped
        @status = :stopped
        has_changed = true
      end
    end

    # Turn on the backlight if a value has changed.
    if has_changed
      main_widgets.each {|w| w.needs_refresh = true } # Refresh all of the widgets, just in case.
      @backlight_time_left = BacklightTimeout
    end

    sleep Update_delay
  end
}

# Thread to count down the remaining time between refreshes (if stream is playing)
countdown_remain_thread = Thread.new {
  while true
    @remain_widget.value = (@remain_widget.value.to_i - 1).to_s if @status == :playing
    sleep 1
  end
}

# Thread to scroll widgets.
scroll_thread = Thread.new {
  while true
    [@artist_widget, @title_widget, @album_widget, @key_info].each do |widget|
      widget.increment_scroll
    end
    sleep Scroll_delay
  end
}

# Thread for alarms (trigger actions at configured times.)
alarm_thread = Thread.new {
  # Wait for status to initialize
  sleep Update_delay * 3
  while true
    time = hk_time
    # Load the alarms file each minute. This is the easiest way to dynamically configure them
    # via the shellfm sinatra app.
    if alarms = YAML.load_file(File.join(File.dirname(__FILE__), "alarms.yml"))
      alarms.each do |alarm|
        if alarm["days_of_week"].include?(time.wday)
          alarm_time = DateTime.parse(alarm["time"])
          if alarm_time.hour == time.hour && alarm_time.min == time.min
            # Alarm matches, trigger action.
            case alarm["action"]
            when "play"
              # Volume 0 (because we may have to unpause for a little while)
              shellfmcmd("volume 0")
              # If station is paused, we must unpause it first.
              shellfmcmd("pause") if @status == :paused
              shellfmcmd("play lastfm://#{alarm["station"]}")
              shellfmcmd("skip") unless @status == :stopped # skip 'delay' unless status is stopped
              shellfmcmd("volume 100") # Reset volume to 100%
            when "pause"
              shellfmcmd("pause") if @status == :playing
            when "stop"
              shellfmcmd("volume 0")
              # If station is paused, we must unpause it first.
              shellfmcmd("pause") if @status == :paused
              shellfmcmd("stop")
              shellfmcmd("volume 100") # Reset volume to 100%
            end
          end
        end
      end
    end
    # Wait until the next minute, then loop.
    while hk_time.min == time.min
      sleep 5
    end
  end
}

# Loop to refresh widgets when needed. Also control backlight.
while true
  case @status
  when :playing, :paused
    if @status_cache == :stopped # Redraw static icons
      write_static_icons
      @status_cache = @status
    end
    main_widgets.each do |widget|
      display_widget(widget) if widget.needs_refresh
    end
  when :stopped
    if @status_cache != :stopped
      $p.clear
      display_widget(@stopped_widget)
      @status_cache = @status
    end
  end

  # Also timeout the backlight, if needed
  if @backlight_time_left > 0
    # If a thread has just set the backlight timeout, turn it on.
    $p.backlight true if @backlight_time_left == BacklightTimeout
    @backlight_time_left -= DisplayUpdateInterval
    if @backlight_time_left <= 0
      @backlight_time_left = 0.0
      $p.backlight false
    end
  end

  sleep DisplayUpdateInterval
end
Something went wrong with that request. Please try again.