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<?xml version="1.0" encoding="utf-8"?>
<page xmlns="http://projectmallard.org/1.0/" type="topic" id="progress" xml:lang="en-GB">
  <info>
    <link type="guide" xref="index#dialogs"/>
    <desc>Use the <cmd>--progress</cmd> option.</desc>
  </info>
  <title>Progress Dialogue</title>
    <p>
	Use the <cmd>--progress</cmd> option to create a progress dialog. 
    </p>

    <p>
      <app>Zenity</app> reads data from standard input line by line. If a line is prefixed with #, the text is updated with the text on that line. If a line contains only a number, the percentage is updated with that number.
    </p>
	
    <p>The progress dialogue supports the following options:</p>

    <terms>

      <item>
        <title><cmd>--text</cmd>=<var>text</var></title>
	  <p>Specifies the text that is displayed in the progress dialogue.</p>
      </item>

      <item>
        <title><cmd>--percentage</cmd>=<var>percentage</var></title>
	  <p>Specifies the initial percentage that is set in the progress dialogue.</p>
      </item>

      <item>
	<title><cmd>--auto-close</cmd></title>
	  <p>Closes the progress dialogue when 100% has been reached.</p>
      </item>

      <item>
        <title><cmd>--pulsate</cmd></title>
	  <p>Specifies that the progress bar pulsates until an EOF character is read from standard input.</p>
      </item>

    </terms>

    <p>
      The following example script shows how to create a progress dialog:
    </p>

<code>
#!/bin/sh
(
echo "10" ; sleep 1
echo "# Updating mail logs" ; sleep 1
echo "20" ; sleep 1
echo "# Resetting cron jobs" ; sleep 1
echo "50" ; sleep 1
echo "This line will just be ignored" ; sleep 1
echo "75" ; sleep 1
echo "# Rebooting system" ; sleep 1
echo "100" ; sleep 1
) |
zenity --progress \
  --title="Update System Logs" \
  --text="Scanning mail logs..." \
  --percentage=0

if [ "$?" = -1 ] ; then
        zenity --error \
          --text="Update canceled."
fi
</code>


    <figure>
      <title>Progress Dialogue Example</title>
      <desc><app>Zenity</app> progress dialog example</desc>
      <media type="image" mime="image/png" src="figures/zenity-progress-screenshot.png"/>
    </figure>
</page>