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# Copyright 2010, 2011 Lars Wirzenius
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import sys
import ttystatus
class TerminalStatus(object):
'''Show status and progress information on a terminal.
All output is provided via widgets of various kinds. Many widgets
format data that TerminalStatus stores. TerminalStatus provides a
dict interface for setting and retrieving data items. Unlike a real
dict, getting a value for a key that has not been set does not
result in a KeyError exception, but in the empty string being
returned.
'''
def __init__(self, output=None, period=None, messager=None):
self._m = messager or ttystatus.Messager(output=output, period=period)
self.clear()
def add(self, widget):
'''Add a new widget to the status display.'''
self._widgets.append(widget)
if widget.interesting_keys is None:
self._wildcards += [widget]
else:
for key in widget.interesting_keys:
self._interests[key] = self._interests.get(key, []) + [widget]
def format(self, format_string):
'''Add new widgets based on format string.
The format string is taken literally, except that ``%%`` is a
literal percent character, and ``%Foo(a,b,c)`` is a widget
of type ``Foo`` with parameters a, b, and c. For example:
``format("hello, %String(name)")``.
'''
for widget in ttystatus.fmt.parse(format_string):
self.add(widget)
def clear(self):
'''Remove all widgets.'''
self._widgets = []
self._values = dict()
self._interests = dict()
self._wildcards = list()
self._latest_width = None
self._m.clear()
def __getitem__(self, key):
'''Return value for key, or the empty string.'''
return self._values.get(key, '')
def get(self, key, default=None):
'''Like dict.get.'''
return self._values.get(key, default)
def __setitem__(self, key, value):
'''Set value for key.'''
self._values[key] = value
width = self._m.width
if width != self._latest_width:
widgets = self._widgets
self._latest_width = width
else:
widgets = self._interests.get(key, []) + self._wildcards
for w in widgets:
w.update(self, width)
width -= len(str(w))
self._m.write(''.join(str(w) for w in self._widgets))
def increase(self, key, delta):
'''Increase value for a key by a given amount.'''
self[key] = (self[key] or 0) + delta
def notify(self, msg):
'''Show a message.'''
self._m.notify(msg, sys.stdout)
def error(self, msg):
'''Write an error message.'''
self._m.notify(msg, sys.stderr)
def finish(self):
'''Finish status display.'''
self._m.finish()
def disable(self):
'''Disable all output.'''
self._m.disable()
def enable(self):
'''Enable output if it has been disabled.'''
self._m.enable()
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