| # Copyright 2014 Dirk Pranke. All rights reserved. |
| # |
| # Licensed under the Apache License, Version 2.0 (the "License"); |
| # you may not use this file except in compliance with the License. |
| # You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, software |
| # distributed under the License is distributed on an "AS IS" BASIS, |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| # See the License for the specific language governing permissions and |
| # limitations under the License. |
| |
| |
| class Printer(object): |
| |
| def __init__(self, print_, should_overwrite, cols): |
| self.print_ = print_ |
| self.should_overwrite = should_overwrite |
| self.cols = cols |
| self.last_line = '' |
| |
| def flush(self): |
| if self.last_line: |
| self.print_('') |
| self.last_line = '' |
| |
| def update(self, msg, elide=True): |
| msg_len = len(msg) |
| if elide and self.cols and msg_len > self.cols - 5: |
| new_len = int((self.cols - 5) / 2) |
| msg = msg[:new_len] + '...' + msg[-new_len:] |
| if self.should_overwrite and self.last_line: |
| self.print_('\r' + ' ' * len(self.last_line) + '\r', end='') |
| elif self.last_line: |
| self.print_('') |
| self.print_(msg, end='') |
| last_nl = msg.rfind('\n') |
| self.last_line = msg[last_nl + 1:] |
