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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
import sys
from Config import Config
from threading import RLock
class Printer:
__single = None
def __init__(self):
if Printer.__single is not None:
raise Printer.__single
self._verbose = Config().verbose
self._stream = sys.stdout
self._rewrite = self._stream.isatty() and not self._verbose
self._current_line = None
self._tests = {}
self._lock = RLock()
Printer.__single = self
def _erase_current_line(self):
if not self._rewrite or self._current_line is None:
return
line_len = len(self._current_line)
self._stream.write('\b' * line_len + ' ' * line_len + '\b' * line_len)
self._current_line = None
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):
with self._lock:
self._erase_current_line()
self._print(msg)
self._current_line = msg[msg.rfind('\n') + 1:]
def printout_update(self, msg):
with self._lock:
if self._rewrite and self._current_line is not None:
msg = self._current_line + msg
elif not self._rewrite:
msg = self._ensure_new_line(msg)
self.printout(msg)
def printout_ln(self, msg):
with self._lock:
if self._current_line is not None:
self._current_line = None
msg = '\n' + msg
self._print(self._ensure_new_line(msg))
def printerr(self, msg):
with self._lock:
self.stderr.write(self._ensure_new_line(msg))
self.stderr.flush()
def print_test_start(self, doc_path, backend_name, n_doc, total_docs):
with self._lock:
self._tests[(doc_path, backend_name)] = n_doc, total_docs
def print_test_result(self, doc_path, backend_name, msg):
if not self._rewrite:
self.print_test_result_ln(doc_path, backend_name, msg)
return
with self._lock:
n_doc, total_docs = self._tests.pop((doc_path, backend_name))
msg = "Tested '%s' using %s backend (%d/%d): %s" % (doc_path, backend_name, n_doc, total_docs, msg)
self.printout(msg)
def print_test_result_ln(self, doc_path, backend_name, msg):
with self._lock:
n_doc, total_docs = self._tests.pop((doc_path, backend_name))
msg = "Tested '%s' using %s backend (%d/%d): %s" % (doc_path, backend_name, n_doc, total_docs, msg)
self.printout_ln(msg)
def print_default(self, msg):
if self._verbose:
self.printout_ln(msg)
def get_printer():
try:
instance = Printer()
except Printer, i:
instance = i
return instance
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