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dialog command buffering problem in pipe

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?

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.