old_contents: sample_code = """\
  if only <stdlib.h> were included...
  if only <stdio.h> were included...
  if only <math.h> were included...
  if only int x were 3...
  if x were 3...
  wish "Hello World" upon a star
  *sigh*
  if wishes were horses..."""
  
  import re
  from functools import reduce
  import subprocess
  import os
  import sys
  
  def add_to_includes(matchobj):
      includes.append("#include " + matchobj.group(1))
  
  SUBS = [
      (r"if wishes were horses\.\.\.", "exit(0);"),
      (r'wish for (.*?) upon a star', r"scanf(\1);"),
      (r"wish (.*?) upon a star", r"puts(\1);"),
      (r"if only (<.*?>) were included\.\.\.", add_to_includes),
      (r"if only ([\w *]+) were (.*?)\.\.\.", r"\1 = \2;"),
      (r"if only I could return (.*?)\.\.\.", r"return \1;"),
      (r"\*sigh\*", "}"),
      (r"if (.*?) ?\.\.\.", r"if(\1) {"),
      (r"wait for (.*?) to change\.\.\.", r"while(\1) {"),
      (r"someday (.*?) ?\.\.\.", r"while(!(\1)) {"),
      (r" +were +", r" == "),
      (r" +will be +", r" == "),
  ]
  
  includes = ["#include <stdbool.h>"]
  
  def compile_code(code):
      global includes
      
      compiled = reduce(lambda code, sub: re.sub(sub[0], sub[1], code), SUBS, code)
      return "\n".join(includes)+"\nint main() {" + compiled + "}"
  
  def run_code(compiled):
      exepath = "tempsigh" + str(os.getpid())
      srcpath = exepath + ".c"
      with open(srcpath, "wt") as source_file:
          source_file.write(compiled)
          
      subprocess.call(["gcc", "-w", "-o", exepath, srcpath])
      subprocess.call(["./" + exepath])
      
      os.remove(exepath)
      os.remove(srcpath)
  
  if __name__ == "__main__":
      with open(sys.argv[1]) as code_file:
          run_code(compile_code(code_file.read()))
  
new_contents: sample_code = """\
  if only <stdlib.h> were included...
  if only <stdio.h> were included...
  if only <math.h> were included...
  if only int x were 3...
  if x were 3...
  wish "Hello World" upon a star
  *sigh*
  if wishes were horses..."""
  
  import re
  from functools import reduce
  import subprocess
  import os
  import sys
  
  def add_to_includes(matchobj):
      includes.append("#include " + matchobj.group(1))
  
  SUBS = [
      (r"if wishes were horses\.\.\.", "exit(0);"),
      (r'wish for (.*?) upon a star', r"scanf(\1);"),
      (r"wish (.*?) upon a star", r"printf(\1);"),
      (r"if only (<.*?>) were included\.\.\.", add_to_includes),
      (r"if only ([\w *]+) were (.*?)\.\.\.", r"\1 = \2;"),
      (r"if only I could return (.*?)\.\.\.", r"return \1;"),
      (r"\*sigh\*", "}"),
      (r"if (.*?) ?\.\.\.", r"if(\1) {"),
      (r"wait for (.*?) to change\.\.\.", r"while(\1) {"),
      (r"someday (.*?) ?\.\.\.", r"while(!(\1)) {"),
      (r" +were +", r" == "),
      (r" +will be +", r" == "),
  ]
  
  includes = ["#include <stdbool.h>"]
  
  def compile_code(code):
      global includes
      
      compiled = reduce(lambda code, sub: re.sub(sub[0], sub[1], code), SUBS, code)
      return "\n".join(includes)+"\nint main() {" + compiled + "}"
  
  def run_code(compiled):
      exepath = "tempsigh" + str(os.getpid())
      srcpath = exepath + ".c"
      with open(srcpath, "wt") as source_file:
          source_file.write(compiled)
          
      subprocess.call(["gcc", "-w", "-o", exepath, srcpath])
      subprocess.call(["./" + exepath])
      
      os.remove(exepath)
      os.remove(srcpath)
  
  if __name__ == "__main__":
      with open(sys.argv[1]) as code_file:
          run_code(compile_code(code_file.read()))
  
subject: Change puts to printf