old_contents: #!/usr/bin/python3
  
  # amalgamate.py
  # Written by Evan Nemerson <evan@nemerson.com>
  #
  # To the extent possible under law, the author(s) have dedicated all
  # copyright and related and neighboring rights to this software to
  # the public domain worldwide. This software is distributed without
  # any warranty.
  #
  # For details, see <http://creativecommons.org/publicdomain/zero/1.0/>.
  # SPDX-License-Identifier: CC0-1.0
  
  # Quick and dirty script to amalgamate C into a single file.  Includes
  # using angle brackets (#include <foo.h>) will be preserved, but for
  # includes using double quotes (#include "foo.h") the file will be
  # included by this script.
  #
  # If you make any improvements please report them in the SIMDe issue
  # tracker at <https://github.com/nemequ/simde/issues> or directly to
  # the author so they can be merged back into the original version.
  
  import sys, re, os
  
  amalgamate_include = re.compile('^\\s*#\\s*include\\s+\\"([^)]+)\\"\\s$')
  already_included = []
  
  def amalgamate(filename, stream):
    full_path = os.path.realpath(os.path.realpath(filename))
    srcdir = os.path.dirname(full_path)
  
    if full_path not in already_included:
      already_included.insert(-1, full_path)
      with open(filename) as input_file:
        stream.write('/* :: Begin ' + os.path.relpath(full_path) + ' :: */\n')
  
        for source_line in input_file:
          a9e_inc_m = amalgamate_include.match(source_line)
          if a9e_inc_m:
            amalgamate(os.path.join(srcdir, a9e_inc_m.group(1)), stream)
          else:
            stream.write(source_line)
  
        stream.write('/* :: End ' + os.path.relpath(full_path) + ' :: */\n')
  
  if len(sys.argv) != 2:
    sys.stderr.write("USAGE: " + sys.argv[0] + ' SOURCE_FILE\n\n')
    sys.stderr.write("This will print a copy of $SOURCE_FILE to stdout, while replacing\n")
    sys.stderr.write("all '#include AMALGAMATE(file)' lines with copies of file.\n")
  
    sys.exit(1)
  
  print('/* AUTOMATICALLY GENERATED FILE, DO NOT MODIFY */\n')
  amalgamate(sys.argv[1], sys.stdout)
  
new_contents: #!/usr/bin/python3
  
  # amalgamate.py
  # Written by Evan Nemerson <evan@nemerson.com>
  #
  # To the extent possible under law, the author(s) have dedicated all
  # copyright and related and neighboring rights to this software to
  # the public domain worldwide. This software is distributed without
  # any warranty.
  #
  # For details, see <http://creativecommons.org/publicdomain/zero/1.0/>.
  # SPDX-License-Identifier: CC0-1.0
  
  # Quick and dirty script to amalgamate C into a single file.  Includes
  # using angle brackets (#include <foo.h>) will be preserved, but for
  # includes using double quotes (#include "foo.h") the file will be
  # included by this script.
  #
  # If you make any improvements please report them in the SIMDe issue
  # tracker at <https://github.com/nemequ/simde/issues> or directly to
  # the author so they can be merged back into the original version.
  
  import sys, re, os, subprocess
  
  amalgamate_include = re.compile('^\\s*#\\s*include\\s+\\"([^)]+)\\"\\s$')
  already_included = []
  
  def amalgamate(filename, stream):
    full_path = os.path.realpath(os.path.realpath(filename))
    srcdir = os.path.dirname(full_path)
  
    if full_path not in already_included:
      already_included.insert(-1, full_path)
      with open(filename) as input_file:
        stream.write('/* :: Begin ' + os.path.relpath(full_path) + ' :: */\n')
  
        for source_line in input_file:
          a9e_inc_m = amalgamate_include.match(source_line)
          if a9e_inc_m:
            amalgamate(os.path.join(srcdir, a9e_inc_m.group(1)), stream)
          else:
            stream.write(source_line)
  
        stream.write('/* :: End ' + os.path.relpath(full_path) + ' :: */\n')
  
  if len(sys.argv) != 2:
    sys.stderr.write("USAGE: " + sys.argv[0] + ' SOURCE_FILE\n\n')
    sys.stderr.write("This will print a copy of $SOURCE_FILE to stdout, while replacing\n")
    sys.stderr.write("all '#include AMALGAMATE(file)' lines with copies of file.\n")
  
    sys.exit(1)
  
  print('/* AUTOMATICALLY GENERATED FILE, DO NOT MODIFY */')
  
  git_id = subprocess.check_output(["git", "rev-parse", "HEAD"]).decode().strip()
  print("/* {:s} */".format(git_id))
  
  amalgamate(sys.argv[1], sys.stdout)
  
subject: Add git ID to amalgamated headers.