#!/usr/bin/env python3
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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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