Mandy/progress.lua

-- take note of YtLink, I keep passing it around in order to show it as the title bar
-- of the download window, YOU WILL HAVE TO PAY ATTENTION TO IT
-- IT GOES THROUGH FUCKING EVERYTHING
-- Also it will be replaced by what the user saves the file as
-- keep that in mind as well
require ('iuplua')

local cancelflag		--set variable
local downloadProgress		--set variable

local function downloadStart(YtLink)		--create button and cancle flag
    cancelButton = iup.button{
        title = "Cancel",
        action = function()	      
            cancelflag = true         
            
            --return iup.CLOSE		--not sure if needed
        
         end

    }
    local pTest = "1"
    downloadProgress = iup.progressbar{expand="HORIZONTAL"}	
    dlgProgress = iup.dialog{				   --create main window
        title = "Downloading.. ",
        dialogframe = "YES", border = "YES",
        iup.vbox {			-- create vbox that contains said objects
            downloadProgress,
            cancelButton,
            pTest,
        }
    }
    dlgProgress.size = "QUARTERxEIGHT" 		--should be size of dialog box
   -- dlgProgress.menubox = "NO"		-- no windows menus
    dlgProgress.close_cb = cancelButton.action	-- calls the action of the button
    dlgProgress:showxy(iup.CENTER, iup.CENTER)	-- show and position box
    return dlgProgress
end


local function DL_progress(YtLink)  -- monitor download progress
   downloadStart(YtLink) 		  -- start the progress bar
   downloadProgress.value = 0  
   local pipe = io.popen("youtube-dl " ..YtLink)
    repeat
        local c = pipe:read(20)	  -- read the first 20 characters of each line
        if c then 		-- if c is true then...
           
        local   b = string.match(c, '.....%%')	  -- %% in a string is "%"
       
        -- string.match finds the percent sign and then finds every character 
        -- for every dot you place.  dots before grab before the character
        -- dots after grab after the character
        
        --[[
Perhaps do a different method
round up and only update if number has changed
-- didn't help at all, reverted to less code]]
        
        
        if b then				
           
             --here we take the last character off of the string
        	--in this case it is the "percent" sign 
             
             local b = string.sub(b,0,-2)
             downloadProgress.value = b/100 -- x out of 100
	     				     -- in this case x is the progress
	     				     -- data we grabbed            	
             iup.Flush()		     -- speeds everything up considerably
             -- when changing an attribute of an element, the change may not 
             -- take place immediately
             -- in that case throw in a flush after the change
            
             iup.LoopStep() -- required to work, also allows user to click button
             iup.Flush() -- added this second flush... helps a shit ton
             if cancelflag then  -- if cancelflag is true, then break
             			 -- which happens if you click the button
                   
                   iup.Message("Terminated", "You have canceled the download") 
                   iup.Flush()
                   break 

             end

       end
       

        
    end

until not c-- creating a loop until c is not true
pipe:close() -- closing the ipopen
--iup.Close()
end

popin = {}
popin.ytdl = function(tubeLink)
  DL_progress(tubeLink)
end

--if you can have your script call this one and insert the link to YtLink... win

--local YtLink = ('http://www.youtube.com/watch?v=jrmlums5bV8')


--DL_progress( YtLink)