Source code for waflib.Logs

#!/usr/bin/env python
# encoding: utf-8
# Thomas Nagy, 2005-2018 (ita)

logging, colors, terminal width and pretty-print

import os, re, traceback, sys
from waflib import Utils, ansiterm

if not os.environ.get('NOSYNC', False):
	# synchronized output is nearly mandatory to prevent garbled output
	if sys.stdout.isatty() and id(sys.stdout) == id(sys.__stdout__):
		sys.stdout = ansiterm.AnsiTerm(sys.stdout)
	if sys.stderr.isatty() and id(sys.stderr) == id(sys.__stderr__):
		sys.stderr = ansiterm.AnsiTerm(sys.stderr)

# import the logging module after since it holds a reference on sys.stderr
# in case someone uses the root logger
import logging

LOG_FORMAT = os.environ.get('WAF_LOG_FORMAT', '%(asctime)s %(c1)s%(zone)s%(c2)s %(message)s')
HOUR_FORMAT = os.environ.get('WAF_HOUR_FORMAT', '%H:%M:%S')

zones = []
See :py:class:`waflib.Logs.log_filter`

verbose = 0
Global verbosity level, see :py:func:`waflib.Logs.debug` and :py:func:`waflib.Logs.error`

colors_lst = {
'USE' : True,
'BOLD'  :'\x1b[01;1m',
'RED'   :'\x1b[01;31m',
'GREEN' :'\x1b[32m',
'PINK'  :'\x1b[35m',
'BLUE'  :'\x1b[01;34m',
'CYAN'  :'\x1b[36m',
'GREY'  :'\x1b[37m',
'cursor_on'  :'\x1b[?25h',
'cursor_off' :'\x1b[?25l',

indicator = '\r\x1b[K%s%s%s'

except NameError:
	unicode = None

[docs]def enable_colors(use): """ If *1* is given, then the system will perform a few verifications before enabling colors, such as checking whether the interpreter is running in a terminal. A value of zero will disable colors, and a value above *1* will force colors. :param use: whether to enable colors or not :type use: integer """ if use == 1: if not (sys.stderr.isatty() or sys.stdout.isatty()): use = 0 if Utils.is_win32 and != 'java': term = os.environ.get('TERM', '') # has ansiterm else: term = os.environ.get('TERM', 'dumb') if term in ('dumb', 'emacs'): use = 0 if use >= 1: os.environ['TERM'] = 'vt100' colors_lst['USE'] = use
# If console packages are available, replace the dummy function with a real # implementation try: get_term_cols = ansiterm.get_term_cols except AttributeError:
[docs] def get_term_cols(): return 80
get_term_cols.__doc__ = """ Returns the console width in characters. :return: the number of characters per line :rtype: int """
[docs]def get_color(cl): """ Returns the ansi sequence corresponding to the given color name. An empty string is returned when coloring is globally disabled. :param cl: color name in capital letters :type cl: string """ if colors_lst['USE']: return colors_lst.get(cl, '') return ''
[docs]class color_dict(object): """attribute-based color access, eg: colors.PINK""" def __getattr__(self, a): return get_color(a) def __call__(self, a): return get_color(a)
colors = color_dict() re_log = re.compile(r'(\w+): (.*)', re.M)
[docs]class log_filter(logging.Filter): """ Waf logs are of the form 'name: message', and can be filtered by 'waf --zones=name'. For example, the following:: from waflib import Logs Logs.debug('test: here is a message') Will be displayed only when executing:: $ waf --zones=test """ def __init__(self, name=''): logging.Filter.__init__(self, name)
[docs] def filter(self, rec): """ Filters log records by zone and by logging level :param rec: log entry """ = rec.module if rec.levelno >= logging.INFO: return True m = re_log.match(rec.msg) if m: = rec.msg = if zones: return getattr(rec, 'zone', '') in zones or '*' in zones elif not verbose > 2: return False return True
[docs]class log_handler(logging.StreamHandler): """Dispatches messages to stderr/stdout depending on the severity level"""
[docs] def emit(self, record): """ Delegates the functionality to :py:meth:`waflib.Log.log_handler.emit_override` """ # default implementation try: try: = except AttributeError: if record.levelno >= logging.WARNING: = = sys.stderr else: = = sys.stdout self.emit_override(record) self.flush() except (KeyboardInterrupt, SystemExit): raise except: # from the python library -_- self.handleError(record)
[docs] def emit_override(self, record, **kw): """ Writes the log record to the desired stream (stderr/stdout) """ self.terminator = getattr(record, 'terminator', '\n') stream = if unicode: # python2 msg = self.formatter.format(record) fs = '%s' + self.terminator try: if (isinstance(msg, unicode) and getattr(stream, 'encoding', None)): fs = fs.decode(stream.encoding) try: stream.write(fs % msg) except UnicodeEncodeError: stream.write((fs % msg).encode(stream.encoding)) else: stream.write(fs % msg) except UnicodeError: stream.write((fs % msg).encode('utf-8')) else: logging.StreamHandler.emit(self, record)
[docs]class formatter(logging.Formatter): """Simple log formatter which handles colors""" def __init__(self): logging.Formatter.__init__(self, LOG_FORMAT, HOUR_FORMAT)
[docs] def format(self, rec): """ Formats records and adds colors as needed. The records do not get a leading hour format if the logging level is above *INFO*. """ try: msg = rec.msg.decode('utf-8') except Exception: msg = rec.msg use = colors_lst['USE'] if (use == 1 and or use == 2: c1 = getattr(rec, 'c1', None) if c1 is None: c1 = '' if rec.levelno >= logging.ERROR: c1 = colors.RED elif rec.levelno >= logging.WARNING: c1 = colors.YELLOW elif rec.levelno >= logging.INFO: c1 = colors.GREEN c2 = getattr(rec, 'c2', colors.NORMAL) msg = '%s%s%s' % (c1, msg, c2) else: # remove single \r that make long lines in text files # and other terminal commands msg = re.sub(r'\r(?!\n)|\x1B\[(K|.*?(m|h|l))', '', msg) if rec.levelno >= logging.INFO: # the goal of this is to format without the leading "Logs, hour" prefix if rec.args: try: return msg % rec.args except UnicodeDecodeError: return msg.encode('utf-8') % rec.args return msg rec.msg = msg rec.c1 = colors.PINK rec.c2 = colors.NORMAL return logging.Formatter.format(self, rec)
log = None """global logger for Logs.debug, Logs.error, etc"""
[docs]def debug(*k, **kw): """ Wraps logging.debug and discards messages if the verbosity level :py:attr:`waflib.Logs.verbose` ≤ 0 """ if verbose: k = list(k) k[0] = k[0].replace('\n', ' ') log.debug(*k, **kw)
[docs]def error(*k, **kw): """ Wrap logging.errors, adds the stack trace when the verbosity level :py:attr:`waflib.Logs.verbose` ≥ 2 """ log.error(*k, **kw) if verbose > 2: st = traceback.extract_stack() if st: st = st[:-1] buf = [] for filename, lineno, name, line in st: buf.append(' File %r, line %d, in %s' % (filename, lineno, name)) if line: buf.append(' %s' % line.strip()) if buf: log.error('\n'.join(buf))
[docs]def warn(*k, **kw): """ Wraps logging.warning """ log.warning(*k, **kw)
[docs]def info(*k, **kw): """ Wraps """*k, **kw)
[docs]def init_log(): """ Initializes the logger :py:attr:`waflib.Logs.log` """ global log log = logging.getLogger('waflib') log.handlers = [] log.filters = [] hdlr = log_handler() hdlr.setFormatter(formatter()) log.addHandler(hdlr) log.addFilter(log_filter()) log.setLevel(logging.DEBUG)
[docs]def make_logger(path, name): """ Creates a simple logger, which is often used to redirect the context command output:: from waflib import Logs bld.logger = Logs.make_logger('test.log', 'build') bld.check(header_name='sadlib.h', features='cxx cprogram', mandatory=False) # have the file closed immediately Logs.free_logger(bld.logger) # stop logging bld.logger = None The method finalize() of the command will try to free the logger, if any :param path: file name to write the log output to :type path: string :param name: logger name (loggers are reused) :type name: string """ logger = logging.getLogger(name) if sys.hexversion > 0x3000000: encoding = sys.stdout.encoding else: encoding = None hdlr = logging.FileHandler(path, 'w', encoding=encoding) formatter = logging.Formatter('%(message)s') hdlr.setFormatter(formatter) logger.addHandler(hdlr) logger.setLevel(logging.DEBUG) return logger
[docs]def make_mem_logger(name, to_log, size=8192): """ Creates a memory logger to avoid writing concurrently to the main logger """ from logging.handlers import MemoryHandler logger = logging.getLogger(name) hdlr = MemoryHandler(size, target=to_log) formatter = logging.Formatter('%(message)s') hdlr.setFormatter(formatter) logger.addHandler(hdlr) logger.memhandler = hdlr logger.setLevel(logging.DEBUG) return logger
[docs]def free_logger(logger): """ Frees the resources held by the loggers created through make_logger or make_mem_logger. This is used for file cleanup and for handler removal (logger objects are re-used). """ try: for x in logger.handlers: x.close() logger.removeHandler(x) except Exception: pass
[docs]def pprint(col, msg, label='', sep='\n'): """ Prints messages in color immediately on stderr:: from waflib import Logs Logs.pprint('RED', 'Something bad just happened') :param col: color name to use in :py:const:`Logs.colors_lst` :type col: string :param msg: message to display :type msg: string or a value that can be printed by %s :param label: a message to add after the colored output :type label: string :param sep: a string to append at the end (line separator) :type sep: string """ info('%s%s%s %s', colors(col), msg, colors.NORMAL, label, extra={'terminator':sep})