| 1 | """ Command line interface to difflib.py providing diffs in four formats:
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| 2 |
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| 3 | * ndiff: lists every line and highlights interline changes.
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| 4 | * context: highlights clusters of changes in a before/after format.
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| 5 | * unified: highlights clusters of changes in an inline format.
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| 6 | * html: generates side by side comparison with change highlights.
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| 7 |
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| 8 | """
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| 9 |
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| 10 | import sys, os, time, difflib, optparse
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| 11 |
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| 12 | def main():
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| 13 |
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| 14 | usage = "usage: %prog [options] fromfile tofile"
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| 15 | parser = optparse.OptionParser(usage)
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| 16 | parser.add_option("-c", action="store_true", default=False, help='Produce a context format diff (default)')
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| 17 | parser.add_option("-u", action="store_true", default=False, help='Produce a unified format diff')
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| 18 | parser.add_option("-m", action="store_true", default=False, help='Produce HTML side by side diff (can use -c and -l in conjunction)')
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| 19 | parser.add_option("-n", action="store_true", default=False, help='Produce a ndiff format diff')
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| 20 | parser.add_option("-l", "--lines", type="int", default=3, help='Set number of context lines (default 3)')
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| 21 | (options, args) = parser.parse_args()
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| 22 |
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| 23 | if len(args) == 0:
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| 24 | parser.print_help()
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| 25 | sys.exit(1)
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| 26 | if len(args) != 2:
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| 27 | parser.error("need to specify both a fromfile and tofile")
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| 28 |
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| 29 | n = options.lines
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| 30 | fromfile, tofile = args
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| 31 |
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| 32 | fromdate = time.ctime(os.stat(fromfile).st_mtime)
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| 33 | todate = time.ctime(os.stat(tofile).st_mtime)
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| 34 | fromlines = open(fromfile, 'U').readlines()
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| 35 | tolines = open(tofile, 'U').readlines()
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| 36 |
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| 37 | if options.u:
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| 38 | diff = difflib.unified_diff(fromlines, tolines, fromfile, tofile, fromdate, todate, n=n)
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| 39 | elif options.n:
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| 40 | diff = difflib.ndiff(fromlines, tolines)
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| 41 | elif options.m:
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| 42 | diff = difflib.HtmlDiff().make_file(fromlines,tolines,fromfile,tofile,context=options.c,numlines=n)
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| 43 | else:
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| 44 | diff = difflib.context_diff(fromlines, tolines, fromfile, tofile, fromdate, todate, n=n)
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| 45 |
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| 46 | sys.stdout.writelines(diff)
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| 47 |
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| 48 | if __name__ == '__main__':
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| 49 | main()
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