Created
March 28, 2012 18:45
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iTunes track information in your terminal!
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# Show iTunes information in real-time in the terminal | |
def status | |
cmd = "osascript -e 'tell application \"iTunes\" to player state'" | |
`#{cmd}` | |
end | |
def track_name | |
cmd = "osascript -e 'tell application \"iTunes\" to name of current track'" | |
`#{cmd}` | |
end | |
def track_artist | |
cmd = "osascript -e 'tell application \"iTunes\" to artist of current track'" | |
`#{cmd}` | |
end | |
def track_album | |
cmd = "osascript -e 'tell application \"iTunes\" to album of current track'" | |
`#{cmd}` | |
end | |
# Return how far we are into the current track | |
def position | |
cmd = "osascript -e 'tell application \"iTunes\" to player position'" | |
pos = `#{cmd}` | |
pos.to_i | |
end | |
def position_string(pos) | |
frac = (pos.to_i)/(60.to_f) | |
min = frac.to_i | |
sec = ((frac - min)*60).ceil | |
min = min.to_s | |
sec = sec.to_s | |
min = ' ' + min if min.size == 1 | |
sec = '0' + sec if sec.size == 1 | |
"#{min}:#{sec}" | |
end | |
def track_time | |
cmd = "osascript -e 'tell application \"iTunes\" to time of current track'" | |
`#{cmd}`.to_f | |
end | |
def track_length | |
cmd = "osascript -e 'tell application \"iTunes\" to duration of current track'" | |
len = `#{cmd}` | |
len.to_i | |
end | |
progress_width = 30 | |
tick_size = 0 | |
len = 0 | |
pos = 0 | |
tick_char = "=" | |
prev_track = "" | |
loop do | |
st = status.strip | |
if st == 'playing' | |
name = track_name | |
if name != prev_track | |
# Get info | |
artist = track_artist | |
album = track_album | |
len = track_length | |
pos = position | |
rem = (len - pos).abs | |
rem_string = position_string(rem) | |
pos_string = position_string(pos) | |
tick_size = len / progress_width | |
# Display info | |
print "\e[1A\e[2K"*4 | |
puts name, artist, album | |
puts "#{pos_string} [#{' '*progress_width}] #{rem_string}" | |
else | |
pos = position | |
rem = (len - pos) | |
pos_string = position_string(pos) | |
rem_string = position_string(rem) | |
ticks = (pos / tick_size).floor | |
spaces = progress_width - ticks | |
print "\e[1A\e[2K" | |
puts "#{pos_string} [#{tick_char*ticks}#{' '*spaces}] #{rem_string}" | |
end | |
prev_track = track_name | |
else | |
prev_track = "" | |
end | |
sleep 0.1 | |
end |
Those are terminal control characters; there's a whole bunch of different ones for doing all sorts of things.
"\e[1A" moves the cursor up one line (the command is "\e[nA", where n is the number of lines).
"\e[2K" clears the current line.
That's essentially how I update the progress bar without having to redraw everything.
More information on terminal control characters: http://www.termsys.demon.co.uk/vtansi.htm (note that "\e" is the same as ESC)
Huh, that's nifty. Thanks, I didn't know about those!
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What does
print "\e[1A\e[2K"*4
do? I assume it's allowing you to do the overwriting of the previous info, but what exactly does the\e[1A\e[2K
voodoo mean?