import sys import datetime import os import subprocess import shlex import fractions from functools import reduce from optparse import Option import numpy as np # limit visibility __all__=[ 'srepr', 'croak', 'report', 'emph','deemph','delete','strikeout', 'execute', 'show_progress', 'scale_to_coprime', 'return_message', 'extendableOption', ] #################################################################################################### # Functions #################################################################################################### def srepr(arg,glue = '\n'): r""" Join arguments with glue string. Parameters ---------- arg : iterable Items to join. glue : str, optional Defaults to \n. """ if (not hasattr(arg, "strip") and (hasattr(arg, "__getitem__") or hasattr(arg, "__iter__"))): return glue.join(str(x) for x in arg) return arg if isinstance(arg,str) else repr(arg) def croak(what, newline = True): """ Write formated to stderr. Parameters ---------- what : str or iterable Content to be displayed. newline : bool, optional Separate items of what by newline. Defaults to True. """ if what is not None: sys.stderr.write(srepr(what,glue = '\n') + ('\n' if newline else '')) sys.stderr.flush() def report(who = None, what = None): """ Reports script and file name. DEPRECATED """ croak( (emph(who)+': ' if who is not None else '') + (what if what is not None else '') + '\n' ) def emph(what): """Formats string with emphasis.""" return bcolors.BOLD+srepr(what)+bcolors.ENDC def deemph(what): """Formats string with deemphasis.""" return bcolors.DIM+srepr(what)+bcolors.ENDC def delete(what): """Formats string as deleted.""" return bcolors.DIM+srepr(what)+bcolors.ENDC def strikeout(what): """Formats string as strikeout.""" return bcolors.CROSSOUT+srepr(what)+bcolors.ENDC def execute(cmd, stream_in = None, wd = './', env = None): """ Execute command. Parameters ---------- cmd : str Command to be executed. stream_in : file object, optional Input (via pipe) for executed process. wd : str, optional Working directory of process. Defaults to ./ . env : dict, optional Environment for execution. """ initialPath = os.getcwd() myEnv = os.environ if env is None else env os.chdir(wd) process = subprocess.Popen(shlex.split(cmd), stdout = subprocess.PIPE, stderr = subprocess.PIPE, stdin = subprocess.PIPE, env = myEnv) stdout, stderr = [i for i in (process.communicate() if stream_in is None else process.communicate(stream_in.read().encode('utf-8')))] os.chdir(initialPath) stdout = stdout.decode('utf-8').replace('\x08','') stderr = stderr.decode('utf-8').replace('\x08','') if process.returncode != 0: raise RuntimeError('{} failed with returncode {}'.format(cmd,process.returncode)) return stdout, stderr def show_progress(iterable,N_iter=None,prefix='',bar_length=50): """ Decorate a loop with a status bar. Use similar like enumerate. Parameters ---------- iterable : iterable/function with yield statement Iterable (or function with yield statement) to be decorated. N_iter : int Total # of iterations. Needed if number of iterations can not be obtained as len(iterable). prefix : str, optional. Prefix string. bar_length : int, optional Character length of bar. Defaults to 50. """ status = _ProgressBar(N_iter if N_iter else len(iterable),prefix,bar_length) for i,item in enumerate(iterable): yield item status.update(i) def scale_to_coprime(v): """Scale vector to co-prime (relatively prime) integers.""" MAX_DENOMINATOR = 1000 def get_square_denominator(x): """Denominator of the square of a number.""" return fractions.Fraction(x ** 2).limit_denominator(MAX_DENOMINATOR).denominator def lcm(a, b): """Least common multiple.""" return a * b // np.gcd(a, b) denominators = [int(get_square_denominator(i)) for i in v] s = reduce(lcm, denominators) ** 0.5 m = (np.array(v)*s).astype(np.int) return m//reduce(np.gcd,m) #################################################################################################### # Classes #################################################################################################### class extendableOption(Option): """ Used for definition of new option parser action 'extend', which enables to take multiple option arguments. Adopted from online tutorial http://docs.python.org/library/optparse.html DEPRECATED """ ACTIONS = Option.ACTIONS + ("extend",) STORE_ACTIONS = Option.STORE_ACTIONS + ("extend",) TYPED_ACTIONS = Option.TYPED_ACTIONS + ("extend",) ALWAYS_TYPED_ACTIONS = Option.ALWAYS_TYPED_ACTIONS + ("extend",) def take_action(self, action, dest, opt, value, values, parser): if action == "extend": lvalue = value.split(",") values.ensure_value(dest, []).extend(lvalue) else: Option.take_action(self, action, dest, opt, value, values, parser) class _ProgressBar: """ Report progress of an interation as a status bar. Works for 0-based loops, ETA is estimated by linear extrapolation. """ def __init__(self,total,prefix,bar_length): """ Inititalize a progress bar to current time as basis for ETA estimation. Parameters ---------- total : int Total # of iterations. prefix : str Prefix string. bar_length : int Character length of bar. """ self.total = total self.prefix = prefix self.bar_length = bar_length self.start_time = datetime.datetime.now() self.last_fraction = 0.0 sys.stderr.write('{} {} 0% ETA n/a'.format(self.prefix, '░'*self.bar_length)) sys.stderr.flush() def update(self,iteration): fraction = (iteration+1) / self.total if int(self.bar_length * fraction) > int(self.bar_length * self.last_fraction): delta_time = datetime.datetime.now() - self.start_time remaining_time = (self.total - (iteration+1)) * delta_time / (iteration+1) remaining_time -= datetime.timedelta(microseconds=remaining_time.microseconds) # remove μs filled_length = int(self.bar_length * fraction) bar = '█' * filled_length + '░' * (self.bar_length - filled_length) sys.stderr.write('\r{} {} {:>4.0%} ETA {}'.format(self.prefix, bar, fraction, remaining_time)) sys.stderr.flush() self.last_fraction = fraction if iteration == self.total - 1: sys.stderr.write('\n') sys.stderr.flush() class bcolors: """ ASCII Colors. https://svn.blender.org/svnroot/bf-blender/trunk/blender/build_files/scons/tools/bcolors.py https://stackoverflow.com/questions/287871 """ HEADER = '\033[95m' OKBLUE = '\033[94m' OKGREEN = '\033[92m' WARNING = '\033[93m' FAIL = '\033[91m' ENDC = '\033[0m' BOLD = '\033[1m' DIM = '\033[2m' UNDERLINE = '\033[4m' CROSSOUT = '\033[9m' def disable(self): self.HEADER = '' self.OKBLUE = '' self.OKGREEN = '' self.WARNING = '' self.FAIL = '' self.ENDC = '' self.BOLD = '' self.UNDERLINE = '' self.CROSSOUT = '' class return_message: """Object with formatted return message.""" def __init__(self,message): """ Sets return message. Parameters ---------- message : str or list of str message for output to screen """ self.message = message def __repr__(self): """Return message suitable for interactive shells.""" return srepr(self.message)