text: #!/usr/bin/env python
  
  import hashlib
  import os
  import re
  
  from fabric.api import env, local, hide
  from fabric.context_managers import lcd, settings
  from fabric.contrib.console import confirm
  from fabric.contrib.files import exists
  from fabric.decorators import runs_once
  from fabric.utils import abort
  from fabric import colors
  
  
  def concat():
      """
      Regenerate dmz_all.cpp.
      """
      impl_files = []
      expiry_impl_files = []
      for base_path, directories, filenames in os.walk("."):
          for filename in filenames:
              if filename == 'dmz_all.cpp':
                  continue
  
              if "cython_dmz" in base_path:
                  continue
  
              if base_path.startswith("./.git/"):
                  continue
  
              is_impl = False
              for impl_extension in (".c", ".cpp"):
                  if filename.endswith(impl_extension):
                      is_impl = True
              if not is_impl:
                  continue
  
              path = os.path.join(base_path, filename)
  
              if "expiry" in path:
                  expiry_impl_files.append(path)
              else:
                  impl_files.append(path)
  
      # sort so that the output is consistently ordered
      impl_files = sorted(impl_files)
      expiry_impl_files = sorted(expiry_impl_files)
  
      include_lines = ["  #include \"compile.h\"", ""]
  
      include_lines.extend(["#ifndef DMZ_ALL_H", "#define DMZ_ALL_H 1", ""])
  
      include_lines.extend(["", "#if COMPILE_DMZ", ""])
  
      for impl_file in impl_files:
          include_lines.append("#include \"{impl_file}\"".format(**locals()))
  
      include_lines.extend(["", "  #if SCAN_EXPIRY"])
      for expiry_impl_file in expiry_impl_files:
          include_lines.append("    #include \"{expiry_impl_file}\"".format(**locals()))
      include_lines.append("  #endif")
  
      include_lines.extend(["", "#else", "", "  #include \"./dmz_olm.cpp\"", "  #include \"./processor_support.cpp\"", "", "#endif  // COMPILE_DMZ"])
  
      include_lines.extend(["", "#endif // DMZ_ALL_H"])
  
      with open("dmz_all.cpp", "w") as out:
          out.write("\n".join(include_lines))
  