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//opt/alt/python33/lib/python3.3/site-packages/pip/log.py

"""Logging
"""

import sys
import os
import logging

from pip import backwardcompat
from pip._vendor import colorama, pkg_resources

def _color_wrap(*colors):
    def wrapped(inp):
        return "".join(list(colors) + [inp, colorama.Style.RESET_ALL])
    return wrapped

def should_color(consumer, environ, std=(sys.stdout, sys.stderr)):
    real_consumer = (consumer if not isinstance(consumer, colorama.AnsiToWin32)
                        else consumer.wrapped)

# If consumer isn't stdout or stderr we shouldn't colorize it
    if real_consumer not in std:
        return False

# If consumer is a tty we should color it
    if hasattr(real_consumer, "isatty") and real_consumer.isatty():
        return True

# If we have an ASNI term we should color it
    if environ.get("TERM") == "ANSI":
        return True

# If anything else we should not color it
    return False

def should_warn(current_version, removal_version):
    # Our Significant digits on versions is 2, so remove everything but the
    #   first two places.
    current_version = ".".join(current_version.split(".")[:2])
    removal_version = ".".join(removal_version.split(".")[:2])

# Our warning threshold is one minor version before removal, so we
    #   decrement the minor version by one
    major, minor = removal_version.split(".")
    minor = str(int(minor) - 1)
    warn_version = ".".join([major, minor])

# Test if our current_version should be a warn
    return (pkg_resources.parse_version(current_version)
                < pkg_resources.parse_version(warn_version))

class Logger(object):
    """
    Logging object for use in command-line script.  Allows ranges of
    levels, to avoid some redundancy of displayed information.
    """
    VERBOSE_DEBUG = logging.DEBUG - 1
    DEBUG = logging.DEBUG
    INFO = logging.INFO
    NOTIFY = (logging.INFO + logging.WARN) / 2
    WARN = WARNING = logging.WARN
    ERROR = logging.ERROR
    FATAL = logging.FATAL

LEVELS = [VERBOSE_DEBUG, DEBUG, INFO, NOTIFY, WARN, ERROR, FATAL]

COLORS = {
        WARN: _color_wrap(colorama.Fore.YELLOW),
        ERROR: _color_wrap(colorama.Fore.RED),
        FATAL: _color_wrap(colorama.Fore.RED),
    }

def __init__(self):
        self.consumers = []
        self.indent = 0
        self.explicit_levels = False
        self.in_progress = None
        self.in_progress_hanging = False

def add_consumers(self, *consumers):
        if sys.platform.startswith("win"):
            for level, consumer in consumers:
                if hasattr(consumer, "write"):
                    self.consumers.append(
                        (level, colorama.AnsiToWin32(consumer)),
                    )
                else:
                    self.consumers.append((level, consumer))
        else:
            self.consumers.extend(consumers)

def debug(self, msg, *args, **kw):
        self.log(self.DEBUG, msg, *args, **kw)

def info(self, msg, *args, **kw):
        self.log(self.INFO, msg, *args, **kw)

def notify(self, msg, *args, **kw):
        self.log(self.NOTIFY, msg, *args, **kw)

def warn(self, msg, *args, **kw):
        self.log(self.WARN, msg, *args, **kw)

def error(self, msg, *args, **kw):
        self.log(self.ERROR, msg, *args, **kw)

def fatal(self, msg, *args, **kw):
        self.log(self.FATAL, msg, *args, **kw)

def deprecated(self, removal_version, msg, *args, **kwargs):
        """
        Logs deprecation message which is log level WARN if the
        ``removal_version`` is > 1 minor release away and log level ERROR
        otherwise.

removal_version should be the version that the deprecated feature is
        expected to be removed in, so something that will not exist in
        version 1.7, but will in 1.6 would have a removal_version of 1.7.
        """
        from pip import __version__

if should_warn(__version__, removal_version):
            self.warn(msg, *args, **kwargs)
        else:
            self.error(msg, *args, **kwargs)

def log(self, level, msg, *args, **kw):
        if args:
            if kw:
                raise TypeError(
                    "You may give positional or keyword arguments, not both")
        args = args or kw

# render
        if args:
            rendered = msg % args
        else:
            rendered = msg
        rendered = ' ' * self.indent + rendered
        if self.explicit_levels:
            ## FIXME: should this be a name, not a level number?
            rendered = '%02i %s' % (level, rendered)

for consumer_level, consumer in self.consumers:
            if self.level_matches(level, consumer_level):
                if (self.in_progress_hanging
                    and consumer in (sys.stdout, sys.stderr)):
                    self.in_progress_hanging = False
                    sys.stdout.write('\n')
                    sys.stdout.flush()
                if hasattr(consumer, 'write'):
                    write_content = rendered + '\n'
                    if should_color(consumer, os.environ):
                        # We are printing to stdout or stderr and it supports
                        #   colors so render our text colored
                        colorizer = self.COLORS.get(level, lambda x: x)
                        write_content = colorizer(write_content)

consumer.write(write_content)
                    if hasattr(consumer, 'flush'):
                        consumer.flush()
                else:
                    consumer(rendered)

def _show_progress(self):
        """Should we display download progress?"""
        return (self.stdout_level_matches(self.NOTIFY) and sys.stdout.isatty())

def start_progress(self, msg):
        assert not self.in_progress, (
            "Tried to start_progress(%r) while in_progress %r"
            % (msg, self.in_progress))
        if self._show_progress():
            sys.stdout.write(' ' * self.indent + msg)
            sys.stdout.flush()
            self.in_progress_hanging = True
        else:
            self.in_progress_hanging = False
        self.in_progress = msg
        self.last_message = None

def end_progress(self, msg='done.'):
        assert self.in_progress, (
            "Tried to end_progress without start_progress")
        if self._show_progress():
            if not self.in_progress_hanging:
                # Some message has been printed out since start_progress
                sys.stdout.write('...' + self.in_progress + msg + '\n')
                sys.stdout.flush()
            else:
                # These erase any messages shown with show_progress (besides .'s)
                logger.show_progress('')
                logger.show_progress('')
                sys.stdout.write(msg + '\n')
                sys.stdout.flush()
        self.in_progress = None
        self.in_progress_hanging = False

def show_progress(self, message=None):
        """If we are in a progress scope, and no log messages have been
        shown, write out another '.'"""
        if self.in_progress_hanging:
            if message is None:
                sys.stdout.write('.')
                sys.stdout.flush()
            else:
                if self.last_message:
                    padding = ' ' * max(0, len(self.last_message) - len(message))
                else:
                    padding = ''
                sys.stdout.write('\r%s%s%s%s' %
                                (' ' * self.indent, self.in_progress, message, padding))
                sys.stdout.flush()
                self.last_message = message

def stdout_level_matches(self, level):
        """Returns true if a message at this level will go to stdout"""
        return self.level_matches(level, self._stdout_level())

def _stdout_level(self):
        """Returns the level that stdout runs at"""
        for level, consumer in self.consumers:
            if consumer is sys.stdout:
                return level
        return self.FATAL

def level_matches(self, level, consumer_level):
        """
        >>> l = Logger()
        >>> l.level_matches(3, 4)
        False
        >>> l.level_matches(3, 2)
        True
        >>> l.level_matches(slice(None, 3), 3)
        False
        >>> l.level_matches(slice(None, 3), 2)
        True
        >>> l.level_matches(slice(1, 3), 1)
        True
        >>> l.level_matches(slice(2, 3), 1)
        False
        """
        if isinstance(level, slice):
            start, stop = level.start, level.stop
            if start is not None and start > consumer_level:
                return False
            if stop is not None or stop <= consumer_level:
                return False
            return True
        else:
            return level >= consumer_level

@classmethod
    def level_for_integer(cls, level):
        levels = cls.LEVELS
        if level < 0:
            return levels[0]
        if level >= len(levels):
            return levels[-1]
        return levels[level]

def move_stdout_to_stderr(self):
        to_remove = []
        to_add = []
        for consumer_level, consumer in self.consumers:
            if consumer == sys.stdout:
                to_remove.append((consumer_level, consumer))
                to_add.append((consumer_level, sys.stderr))
        for item in to_remove:
            self.consumers.remove(item)
        self.consumers.extend(to_add)

logger = Logger()