old_contents: import fnmatch
  import os, shutil, subprocess
  
  class Os:
  	OsDict = {}
  	CurrentOs = None
  	
  	def __init__(self, name, path):
  		self.name = name
  		self.path = path
  
  	@staticmethod
  	def Get(name):
  		return Os.OsDict[name]
  
  	@staticmethod
  	def Add(name, path):
  		Os.OsDict[name] = Os(name, path)
  
  	@staticmethod
  	def Init():
  		Os.Add("linux","linux")
  		Os.Add("windows", "win")
  
  		CurrentOs = Os.Get('linux')
  
  
  pdir = os.path.dirname
  
  Paths = {
  	"cmake" : os.getcwd(),
  	"build" : "build"
  }
  
  def preserve_directory(directory):
  	def preserve_decorator(fn):
  		def wrapped(*args, **kwargs):
  			os.chdir(directory)
  			ret = fn(*args, **kwargs)
  			os.chdir(directory)
  			return ret
  		return wrapped
  	return preserve_decorator
  
  class Builder:
  	Threads = 9
  
  	def __init__(self):
  		return
  
  	@preserve_directory(Paths['cmake'])
  	def CleanCompileDir(self):
  		shutil.rmtree(os.path.join(Paths['cmake'],Paths['build']))
  
  	def CreateBuildDir(self):
  		#if os.path.exists(Paths['build']):
  		#	self.CleanCompileDir()
  
  		try:
  			os.mkdir(Paths['build'])
  		except OSError as e:	  
  			print('Failed creating build directory.')
  			return
  
  
  	@preserve_directory(Paths['cmake'])
  	def Compile(self):
  		self.CreateBuildDir()
  		os.chdir(Paths['build'])
  		subprocess.call('cmake ../ -DCMAKE_BUILD_TYPE=RelWithDebInfo -G "Unix Makefiles"', shell=True)
  		subprocess.call('make -j' + str(Builder.Threads), shell=True)
  
  #run
  Os.Init()
  Builder().Compile()
  
new_contents: import fnmatch
  import os, shutil, subprocess
  
  class Os:
  	OsDict = {}
  	CurrentOs = None
  	
  	def __init__(self, name, path):
  		self.name = name
  		self.path = path
  
  	@staticmethod
  	def Get(name):
  		return Os.OsDict[name]
  
  	@staticmethod
  	def Add(name, path):
  		Os.OsDict[name] = Os(name, path)
  
  	@staticmethod
  	def Init():
  		Os.Add("linux","linux")
  		Os.Add("windows", "win")
  
  		CurrentOs = Os.Get('linux')
  
  
  pdir = os.path.dirname
  
  Paths = {
  	"cmake" : os.getcwd(),
  	"build" : "build"
  }
  
  def preserve_directory(directory):
  	def preserve_decorator(fn):
  		def wrapped(*args, **kwargs):
  			os.chdir(directory)
  			ret = fn(*args, **kwargs)
  			os.chdir(directory)
  			return ret
  		return wrapped
  	return preserve_decorator
  
  class Builder:
  	Threads = 9
  
  	def __init__(self):
  		return
  
  	@preserve_directory(Paths['cmake'])
  	def CleanCompileDir(self):
  		shutil.rmtree(os.path.join(Paths['cmake'],Paths['build']))
  
  	def CreateBuildDir(self):
  		#if os.path.exists(Paths['build']):
  		#	self.CleanCompileDir()
  
  		try:
  			os.mkdir(Paths['build'])
  		except OSError as e:	  
  			print('Failed creating build directory.')
  			return
  
  
  	@preserve_directory(Paths['cmake'])
  	def Compile(self):
  		self.CreateBuildDir()
  		os.chdir(Paths['build'])
  		subprocess.check_call('cmake ../ -DCMAKE_BUILD_TYPE=RelWithDebInfo -G "Unix Makefiles"', shell=True)
  		subprocess.check_call('make -j' + str(Builder.Threads), shell=True)
  
  #run
  Os.Init()
  Builder().Compile()
  
subject: Update build.py