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/usr/share/pyshared/rednose.py is in python-rednose 0.4.1-1.

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# Copyright (c) 2009, Tim Cuthbertson # All rights reserved.
# 
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 
#     * Redistributions of source code must retain the above copyright
#       notice, this list of conditions and the following disclaimer.
#     * Redistributions in binary form must reproduce the above
#       copyright notice, this list of conditions and the following
#       disclaimer in the documentation and/or other materials provided
#       with the distribution.
#     * Neither the name of the organisation nor the names of its
#       contributors may be used to endorse or promote products derived
#       from this software without specific prior written permission.
# 
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
# WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.

from __future__ import print_function
import os
import sys
import linecache
import re
import time

import nose

import termstyle

failure = 'FAILED'
error = 'ERROR'
success = 'passed'
skip = 'skipped'
line_length = 77

PY3 = sys.version_info[0] >= 3
if PY3:
	to_unicode = str
else:
	def to_unicode(s):
		try:
			return unicode(s)
		except UnicodeDecodeError:
			return unicode(repr(str(s)))

BLACKLISTED_WRITERS = [
	'nose[\\/]result\\.pyc?$',
	'unittest[\\/]runner\\.pyc?$'
]
REDNOSE_DEBUG = False


class RedNose(nose.plugins.Plugin):
	env_opt = 'NOSE_REDNOSE'
	env_opt_color = 'NOSE_REDNOSE_COLOR'
	score = 199  # just under the `coverage` module

	def __init__(self, *args):
		super(RedNose, self).__init__(*args)
		self.reports = []
		self.error = self.success = self.failure = self.skip = 0
		self.total = 0
		self.stream = None
		self.verbose = False
		self.enabled = False
		self.tree = False

	def options(self, parser, env=os.environ):
		global REDNOSE_DEBUG
		rednose_on = bool(env.get(self.env_opt, False))
		rednose_color = env.get(self.env_opt_color, 'auto')
		REDNOSE_DEBUG = bool(env.get('REDNOSE_DEBUG', False))

		parser.add_option(
			"--rednose",
			action="store_true",
			default=rednose_on,
			dest="rednose",
			help="enable colour output (alternatively, set $%s=1)" % (self.env_opt,)
		)
		parser.add_option(
			"--no-color",
			action="store_false",
			dest="rednose",
			help="disable colour output"
		)
		parser.add_option(
			"--force-color",
			action="store_const",
			dest='rednose_color',
			default=rednose_color,
			const='force',
			help="force colour output when not using a TTY (alternatively, set $%s=force)" % (self.env_opt_color,)
		)
		parser.add_option(
			"--immediate",
			action="store_true",
			default=False,
			help="print errors and failures as they happen, as well as at the end"
		)

	def configure(self, options, conf):
		if options.rednose:
			self.enabled = True
			termstyle_init = {
				'force': termstyle.enable,
				'off': termstyle.disable
			}.get(options.rednose_color, termstyle.auto)
			termstyle_init()

			self.immediate = options.immediate
			self.verbose = options.verbosity >= 2

	def begin(self):
		self.start_time = time.time()
		self._in_test = False

	def _format_test_name(self, test):
		return test.shortDescription() or to_unicode(test)

	def prepareTestResult(self, result):
		result.stream = FilteringStream(self.stream, BLACKLISTED_WRITERS)

	def beforeTest(self, test):
		self._in_test = True
		if self.verbose:
			self._out(self._format_test_name(test) + ' ... ')

	def afterTest(self, test):
		if self._in_test:
			self.addSkip()

	def _print_test(self, type_, color):
		self.total += 1
		if self.verbose:
			self._outln(color(type_))
		else:
			if type_ == failure:
				short_ = 'F'
			elif type_ == error:
				short_ = 'X'
			elif type_ == skip:
				short_ = '-'
			else:
				short_ = '.'
			self._out(color(short_))
			if self.total % line_length == 0:
				self._outln()
		self._in_test = False

	def _add_report(self, report):
		failure_type, test, err = report
		self.reports.append(report)
		if self.immediate:
			self._outln()
			self._report_test(len(self.reports), *report)

	def addFailure(self, test, err):
		self.failure += 1
		self._add_report((failure, test, err))
		self._print_test(failure, termstyle.red)

	def addError(self, test, err):
		if err[0].__name__ == 'SkipTest':
			self.addSkip(test, err)
			return
		self.error += 1
		self._add_report((error, test, err))
		self._print_test(error, termstyle.yellow)

	def addSuccess(self, test):
		self.success += 1
		self._print_test(success, termstyle.green)

	def addSkip(self, test=None, err=None):
		self.skip += 1
		self._print_test(skip, termstyle.blue)

	def setOutputStream(self, stream):
		self.stream = stream

	def report(self, stream):
		"""report on all registered failures and errors"""
		self._outln()
		if self.immediate:
			for x in range(0, 5):
				self._outln()
		report_num = 0
		if len(self.reports) > 0:
			for report_num, report in enumerate(self.reports):
				self._report_test(report_num + 1, *report)
			self._outln()

		self._summarize()

	def _summarize(self):
		"""summarize all tests - the number of failures, errors and successes"""
		self._line(termstyle.black)
		self._out("%s test%s run in %0.1f seconds" % (
			self.total,
			self._plural(self.total),
			time.time() - self.start_time))
		if self.total > self.success:
			self._outln(". ")
			additionals = []
			if self.failure > 0:
				additionals.append(termstyle.red("%s FAILED" % (
					self.failure,)))
			if self.error > 0:
				additionals.append(termstyle.yellow("%s error%s" % (
					self.error,
					self._plural(self.error) )))
			if self.skip > 0:
				additionals.append(termstyle.blue("%s skipped" % (
					self.skip)))
			self._out(', '.join(additionals))
				
		self._out(termstyle.green(" (%s test%s passed)" % (
			self.success,
			self._plural(self.success) )))
		self._outln()

	def _report_test(self, report_num, type_, test, err):
		"""report the results of a single (failing or errored) test"""
		self._line(termstyle.black)
		self._out("%s) " % (report_num))
		if type_ == failure:
			color = termstyle.red
			self._outln(color('FAIL: %s' % (self._format_test_name(test),)))
		else:
			color = termstyle.yellow
			self._outln(color('ERROR: %s' % (self._format_test_name(test),)))

		exc_type, exc_instance, exc_trace = err

		self._outln()
		self._outln(self._fmt_traceback(exc_trace))
		self._out(color('   ', termstyle.bold(color(exc_type.__name__)), ": "))
		self._outln(self._fmt_message(exc_instance, color))
		self._outln()

	def _relative_path(self, path):
		"""
		If path is a child of the current working directory, the relative
		path is returned surrounded by bold xterm escape sequences.
		If path is not a child of the working directory, path is returned
		"""
		try:
			here = os.path.abspath(os.path.realpath(os.getcwd()))
			fullpath = os.path.abspath(os.path.realpath(path))
		except OSError:
			return path
		if fullpath.startswith(here):
			return termstyle.bold(fullpath[len(here)+1:])
		return path

	def _file_line(self, tb):
		"""formats the file / lineno / function line of a traceback element"""
		prefix = "file://"
		prefix = ""

		f = tb.tb_frame
		if '__unittest' in f.f_globals:
			# this is the magical flag that prevents unittest internal
			# code from junking up the stacktrace
			return None

		filename = f.f_code.co_filename
		lineno = tb.tb_lineno
		linecache.checkcache(filename)
		function_name = f.f_code.co_name

		line_contents = linecache.getline(filename, lineno, f.f_globals).strip()

		return "    %s line %s in %s\n      %s" % (
			termstyle.blue(prefix, self._relative_path(filename)),
			lineno,
			termstyle.cyan(function_name),
			line_contents)

	def _fmt_traceback(self, trace):
		"""format a traceback"""
		ret = []
		ret.append(termstyle.default("   Traceback (most recent call last):"))
		current_trace = trace
		while current_trace is not None:
			line = self._file_line(current_trace)
			if line is not None:
				ret.append(line)
			current_trace = current_trace.tb_next
		return '\n'.join(ret)
	
	def _fmt_message(self, exception, color):
		orig_message_lines = to_unicode(exception).splitlines()

		if len(orig_message_lines) == 0:
			return ''
		message_lines = [color(orig_message_lines[0])]
		for line in orig_message_lines[1:]:
			match = re.match('^---.* begin captured stdout.*----$', line)
			if match:
				color = None
				message_lines.append('')
			line = '   ' + line
			message_lines.append(color(line) if color is not None else line)
		return '\n'.join(message_lines)

	def _out(self, msg='', newline=False):
		self.stream.write(msg)
		if newline:
			self.stream.write('\n')

	def _outln(self, msg=''):
		self._out(msg, True)

	def _plural(self, num):
		return '' if num == 1 else 's'

	def _line(self, color=termstyle.reset, char='-'):
		"""
		print a line of separator characters (default '-')
		in the given colour (default black)
		"""
		self._outln(color(char * line_length))


import traceback
import sys


class FilteringStream(object):
	"""
	A wrapper for a stream that will filter
	calls to `write` and `writeln` to ignore calls
	from blacklisted callers
	(implemented as a regex on their filename, according
	to traceback.extract_stack())

	It's super hacky, but there seems to be no other way
	to suppress nose's default output
	"""
	def __init__(self, stream, excludes):
		self.__stream = stream
		self.__excludes = list(map(re.compile, excludes))

	def __should_filter(self):
		try:
			stack = traceback.extract_stack(limit=3)[0]
			filename = stack[0]
			pattern_matches_filename = lambda pattern: pattern.search(filename)
			should_filter = any(map(pattern_matches_filename, self.__excludes))
			if REDNOSE_DEBUG:
				print >> sys.stderr, "REDNOSE_DEBUG: got write call from %s, should_filter = %s" % (
						filename, should_filter)
			return should_filter
		except StandardError as e:
			if REDNOSE_DEBUG:
				print("\nError in rednose filtering: %s" % (e,), file=sys.stderr)
				traceback.print_exc(sys.stderr)
			return False

	def write(self, *a):
		if self.__should_filter():
			return
		return self.__stream.write(*a)

	def writeln(self, *a):
		if self.__should_filter():
			return
		return self.__stream.writeln(*a)

	# pass non-known methods through to self.__stream
	def __getattr__(self, name):
		if REDNOSE_DEBUG:
			print("REDNOSE_DEBUG: getting attr %s" % (name,), file=sys.stderr)
		return getattr(self.__stream, name)