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Viewing changes to bzrlib/ui/text.py

Introduce new bzr progress bar api. ui_factory.nested_progress_bar.

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bzrlib/ui/text.py
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import sys
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import bzrlib.progress
 
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from bzrlib.symbol_versioning import *
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from bzrlib.ui import UIFactory
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class TextUIFactory(UIFactory):
 
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    def __init__(self):
 
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        super(TextUIFactory, self).__init__()
 
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        self._progress_bar_stack = None
 
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    deprecated_method(zero_eight)
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    def progress_bar(self):
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        """See UIFactory.nested_progress_bar()."""
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        # this in turn is abstract, and creates either a tty or dots
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        # bar depending on what we think of the terminal
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        return bzrlib.progress.ProgressBar()
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        except KeyboardInterrupt:
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            return None
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    def nested_progress_bar(self):
 
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        """Return a nested progress bar.
 
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        The actual bar type returned depends on the progress module which
 
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        may return a tty or dots bar depending on the terminal.
 
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        """
 
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        if self._progress_bar_stack is None:
 
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            self._progress_bar_stack = bzrlib.progress.ProgressBarStack()
 
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        return self._progress_bar_stack.get_nested()