Synnefo » snf-image-creator

# -*- coding: utf-8 -*-

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# Copyright 2012 GRNET S.A. All rights reserved.

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"""This package is intended to provide output classes for printing messages and

progress bars. The user can change the output behaviour of the program by

subclassing the Output class and assigning the derived one as the output class

of the various parts of the image-creator package.

"""

class Output(object):

    """A class for printing program output"""

    def error(self, msg, new_line=True):

        """Print an error"""

        pass

    def warn(self, msg, new_line=True):

        """Print a warning"""

        pass

    def success(self, msg, new_line=True):

        """Print msg after an action is completed"""

        pass

    def output(self, msg='', new_line=True):

        """Print normal program output"""

        pass

    def cleanup(self):

        """Cleanup this output class"""

        pass

    def clear(self):

        """Clear the screen"""

        pass

    def _get_progress(self):

        """Returns a new Progress object"""

        progress = self._Progress

        progress.output = self

        return progress

    Progress = property(_get_progress)

    class _Progress(object):

        """Internal progress bar class"""

        def __init__(self, size, title, bar_type='default'):

            self.size = size

            self.bar_type = bar_type

            self.output.output("%s ..." % title, False)

        def goto(self, dest):

            """Move progress to a specific position"""

            pass

        def next(self):

            """Move progress a step forward"""

            pass

        def success(self, result):

            """Print a msg after an action is completed successfully"""

            self.output.success(result)

    def progress_generator(self, message):

        """A python generator for the progress bar class"""

        def generator(n):

            progressbar = self.Progress(n, message)

            for _ in range(n):

                yield

                progressbar.next()

            progressbar.success('done')

            yield

        return generator

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