A Textual plugin script that gets the currently playing song from Cog, and scrapes the UI for the current position to calculate time remaining.

Cog.scpt

-- Copyright © 2013 Mark Seymour (mark.seymour.ns@gmail.com)

on textualcmd()
  tell application "System Events"
		tell application "System Events" to set isRunning to exists (processes where name is "Cog")
		set curpos to value of static text of group 2 of tool bar 1 of window of application process "Cog"
	end tell
	
	set listening to "/me np: "
	
	tell application "Cog"
		set ce to properties of currententry
		if (artist of ce ≠ missing value) then set listening to listening & (artist of ce) & " - "
		if (title of ce ≠ missing value) then set listening to listening & (title of ce) & " "
		if (album of ce ≠ missing value) then set listening to listening & "[" & (album of ce) & "] "
		set listening to listening & "-" & my float2time(my elapsed2remaining(curpos as text, length of ce)) & " / " & my float2time(length of ce)
	end tell
	
	return listening
end textualcmd

on float2time(duration)
	set mins to duration div minutes
	set secs to (duration mod minutes) as integer
	return ((mins as text) & ":" & (secs as text))
end float2time

on elapsed2remaining(elapsed, duration)
	set tid to AppleScript's text item delimiters
	set AppleScript's text item delimiters to ":"
	set esecs to ((first text item of elapsed as integer) * 60) + (last text item of elapsed as integer)
	set AppleScript's text item delimiters to tid
	return (duration as integer) - esecs
end elapsed2remaining