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# Printer.py
#
# Copyright (C) 2012 Carlos Garcia Campos <carlosgc@gnome.org>
#
# 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 2 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, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
from __future__ import absolute_import, division, print_function
import sys
from Config import Config
from threading import RLock
_instance = None
class Printer:
def __init__(self):
global _instance
if _instance is not None:
raise RuntimeError('Printer must not be instantiated more than '
'once. Use the get_printer() function instead.')
self._verbose = Config().verbose
self._stream = sys.stdout
self._rewrite = self._stream.isatty() and not self._verbose
self._current_line_len = 0
self._blocked = 0
self._lock = RLock()
_instance = self
def _erase_current_line(self):
if not self._current_line_len:
return
line_len = self._current_line_len
self._stream.write('\b' * line_len + ' ' * line_len + '\b' * line_len)
self._current_line_len = 0
def _ensure_new_line(self, msg):
if not msg.endswith('\n'):
msg += '\n'
return msg
def _print(self, msg):
self._stream.write(msg)
self._stream.flush()
def printout(self, msg):
if not self._rewrite:
self.printout_ln(msg)
with self._lock:
if self._blocked > 0:
return
self._erase_current_line()
self._print(msg)
self._current_line_len = len(msg[msg.rfind('\n') + 1:])
def printout_ln(self, msg=''):
with self._lock:
if self._blocked > 0:
return
self._erase_current_line()
self._print(self._ensure_new_line(msg))
def printerr(self, msg):
with self._lock:
if self._blocked > 0:
return
sys.stderr.write(self._ensure_new_line(msg))
sys.stderr.flush()
def print_test_result(self, doc_path, backend_name, n_test, total_tests, msg):
self.printout("[%d/%d] %s (%s): %s" % (n_test, total_tests, doc_path, backend_name, msg))
def print_test_result_ln(self, doc_path, backend_name, n_test, total_tests, msg):
self.printout_ln("[%d/%d] %s (%s): %s" % (n_test, total_tests, doc_path, backend_name, msg))
def print_default(self, msg):
if self._verbose:
self.printout_ln(msg)
def block(self):
with self._lock:
self._blocked += 1
def unblock(self):
with self._lock:
self._blocked -= 1
def get_printer():
if _instance is None:
Printer()
return _instance
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