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""" Command line interface to difflib.py providing diffs in four formats: |
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* ndiff: lists every line and highlights interline changes. |
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* context: highlights clusters of changes in a before/after format. |
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* unified: highlights clusters of changes in an inline format. |
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* html: generates side by side comparison with change highlights. |
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""" |
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import sys, os, difflib, argparse |
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from datetime import datetime, timezone |
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def file_mtime(path): |
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t = datetime.fromtimestamp(os.stat(path).st_mtime, |
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timezone.utc) |
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return t.astimezone().isoformat() |
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def main(): |
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parser = argparse.ArgumentParser() |
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parser.add_argument('-c', action='store_true', default=False, |
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help='Produce a context format diff (default)') |
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parser.add_argument('-u', action='store_true', default=False, |
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help='Produce a unified format diff') |
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parser.add_argument('-m', action='store_true', default=False, |
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help='Produce HTML side by side diff ' |
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'(can use -c and -l in conjunction)') |
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parser.add_argument('-n', action='store_true', default=False, |
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help='Produce a ndiff format diff') |
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parser.add_argument('-l', '--lines', type=int, default=3, |
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help='Set number of context lines (default 3)') |
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parser.add_argument('fromfile') |
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parser.add_argument('tofile') |
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options = parser.parse_args() |
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n = options.lines |
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fromfile = options.fromfile |
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tofile = options.tofile |
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fromdate = file_mtime(fromfile) |
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todate = file_mtime(tofile) |
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with open(fromfile) as ff: |
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fromlines = ff.readlines() |
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with open(tofile) as tf: |
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tolines = tf.readlines() |
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if options.u: |
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diff = difflib.unified_diff(fromlines, tolines, fromfile, tofile, fromdate, todate, n=n) |
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elif options.n: |
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diff = difflib.ndiff(fromlines, tolines) |
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elif options.m: |
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diff = difflib.HtmlDiff().make_file(fromlines,tolines,fromfile,tofile,context=options.c,numlines=n) |
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else: |
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diff = difflib.context_diff(fromlines, tolines, fromfile, tofile, fromdate, todate, n=n) |
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sys.stdout.writelines(diff) |
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if __name__ == '__main__': |
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main() |
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