dialog command buffering problem in pipe

yamanoorsai · 08-23-2012, 07:08 AM

I am trying to pipe percentage values into pipe by the following methods:

Code:

rsync -a --progress ~/Desktop/test.tar.gz ~/Downloads | 
 	unbuffer -p grep -o "[0-9]*%" | 
 	unbuffer -p cut -f1 -d '%'|
        dialog --title "Test" --gauge "Copying file. " 6 100

If you try to copy a file from a DVD, the dialog screen is reset every time and the screen just shows 0%.

I am trying an alternative:

Code:

dialog --title "Test" --gauge "Copying file." 6 100 <<< "$(
 	rsync -a --progress ~/Desktop/version-000.tar.gz ~/Downloads |       unbuffer -p grep -o "[0-9]*%" | 
 	unbuffer -p cut -f1 -d '%'  
	)"

The alternative method is buffering the data and I am not able to display the data immediately. Are there alternatives?

414N · 08-23-2012, 07:25 AM

I came across a similar problem when trying to put an mencoder/ffmpeg video conversion progress inside a dialog gauge widget.
You can try it this way (warning: the following script needs polishing):

Code:

rsync  -aP FILE  DEST | while read -d $'\r' INFO
do
	#Retrieve progress %
	progress=$(echo "$INFO" | awk '{print $2}')
	#Remove trail %
	progress=${progress%\%*}
	#Pass the progress % to dialog
	echo $progress | dialog --title "Insert a title here" --gauge "Insert some useful text here" 6 100
done

You'll extract a wrong progress indicator on the first lines of rsync output, but that can be mitigated with appropriate checks on the progress variable.