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- #!/usr/bin/env python3
- """
- Clean up control characters and trailing whitespace in the listed source files
- and create a unified diff between them.
- If more or less than two files are listed on the command line, the cleanup is
- 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.
- """
- import sys,re
- from difflib import unified_diff
- fns = sys.argv[1:]
- translate = {
- '\r': '[CR]\n',
- '\b': '[BS]',
- }
- def cleanup_file(fn):
- data = open(fn).read()
- def gen_text():
- for line in data.splitlines():
- 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())
- open(fn+'.orig','w').write(data)
- open(fn,'w').write('\n'.join(ret))
- return ret
- cleaned_texts = [cleanup_file(fn) for fn in fns]
- if len(fns) == 2:
- """
- chunk headers have trailing newlines, hence the rstrip()
- """
- 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.')
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