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112 lines
3.5 KiB
Python
112 lines
3.5 KiB
Python
#!/usr/bin/python2
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#
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# Python progressbar functions.
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#
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# Copyright (C) 2014 Sebastian Lackner
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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#
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import fcntl
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import os
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import signal
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import struct
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import sys
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import termios
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def _sig_winch(signum=None, frame=None):
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"""Signal handler for SIGWINCH."""
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global _term_width
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try:
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h, w, hp, wp = struct.unpack('HHHH', fcntl.ioctl(sys.stdout.fileno(),
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termios.TIOCGWINSZ, struct.pack('HHHH', 0, 0, 0, 0)))
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_term_width = w
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except IOError:
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# ignore 'IOError: [Errno 25] Inappropriate ioctl for device',
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# which can occur when resizing the window while the output is redirected
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pass
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try:
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_sig_winch()
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signal.signal(signal.SIGWINCH, _sig_winch)
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except IOError:
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_term_width = int(os.environ.get('COLUMNS', 80)) - 1
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class ProgressBar(object):
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def __init__(self, desc="", msg=None, current=0, total=100):
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"""Initialize a new progress bar with given properties."""
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self.desc = desc
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self.msg = msg
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self.current = current
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self.total = total
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def __enter__(self):
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self.update()
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return self
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def __exit__(self, type, value, traceback):
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if type is not None:
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sys.stdout.write("\r")
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msg = "<interrupted>"
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else:
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msg = None
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self.finish(msg)
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if self.msg is not None:
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sys.stdout.write("\n")
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def update(self, value = None):
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"""Redraw the progressbar and optionally update the value."""
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if value is not None:
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self.current = value
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if self.current == 0 or (self.current >= self.total and self.msg is None):
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sys.stdout.write("%s\r" % (' ' * _term_width))
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sys.stdout.flush()
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return
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width = _term_width / 2
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s1 = self.desc.ljust(width - 1, ' ')[:width - 1]
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width = _term_width - width
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if self.current >= self.total:
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s2 = self.msg.ljust(width, ' ')[:width]
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elif width > 2:
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numbars = min(self.current * (width - 2) / self.total, width - 2)
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s2 = "[%s%s]" % ('#' * numbars, '-' * (width - 2 - numbars))
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percent = " %d%% " % min(self.current * 100 / self.total, 100)
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i = (len(s2)-len(percent))/2
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s2 = "%s%s%s" % (s2[:i], percent, s2[i+len(percent):])
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sys.stdout.write("%s %s\r" % (s1, s2))
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sys.stdout.flush()
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def finish(self, msg = None):
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"""Finalize the progressbar."""
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if msg is not None:
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self.msg = msg
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self.current = self.total
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self.update()
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sys.stdout.flush()
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if __name__ == '__main__':
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import time
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print ""
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with ProgressBar(desc="description") as x:
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for i in xrange(100):
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x.update(i)
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time.sleep(1)
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