test.py, gendiff.py: minor fixes

scripts/gendiff.py

@@ -10,7 +10,7 @@ performed on all files, but no diff is created.
 The source files are assumed to be terminal output captured by the `script`
 command.
 
-The original source files are backed up with the .orig extension.
+The cleaned source files are saved with the .clean extension.
 """
 
 import sys,re
@@ -19,35 +19,44 @@ from difflib import unified_diff
 fns = sys.argv[1:]
 
 translate = {
-	'\r': '[CR]\n',
+#	'\r': '[CR]\n',
+	'\r': '',
 	'\b': '[BS]',
+#	chr(4): '', # Ctrl-D, EOT
 }
 
 def cleanup_file(fn):
+
 	with open(fn) as fp:
 		data = fp.read()
+
 	def gen_text():
 		for line in data.splitlines():
-			line = re.sub('\r\n','\n',line) # DOS CRLF to Unix LF
+#			line = re.sub('\r\n','\n',line) # DOS CRLF to Unix LF
 			line = line.translate({ord(a):b for a,b in translate.items()})
 			line = re.sub(r'\s+$','',line)  # trailing whitespace
 			yield line
+
 	ret = list(gen_text())
-	with open(fn+'.orig','w') as fp:
-		fp.write(data)
-	with open(fn,'w') as fp:
+
+	sys.stderr.write(f'Saving cleaned file to {fn}.clean\n')
+
+	with open(f'{fn}.clean','w') as fp:
 		fp.write('\n'.join(ret))
+
 	return ret
 
+if len(fns) != 2:
+	sys.stderr.write(f'{len(fns)} input files.  Not generating diff.\n')
+
 cleaned_texts = [cleanup_file(fn) for fn in fns]
 
 if len(fns) == 2:
 	"""
 	chunk headers have trailing newlines, hence the rstrip()
 	"""
+	sys.stderr.write('Generating diff\n')
 	print(
 		f'diff a/{fns[0]} b/{fns[1]}\n' +
 		'\n'.join(a.rstrip() for a in unified_diff(*cleaned_texts,fromfile=f'a/{fns[0]}',tofile=f'b/{fns[1]}'))
 	)
-else:
-	print(f'{len(fns)} input files.  Not generating diff.')