Edit File: diff.py
#! /usr/bin/python2.7 """ Command line interface to difflib.py providing diffs in four formats: * ndiff: lists every line and highlights interline changes. * context: highlights clusters of changes in a before/after format. * unified: highlights clusters of changes in an inline format. * html: generates side by side comparison with change highlights. """ import sys, os, time, difflib, optparse def main(): usage = "usage: %prog [options] fromfile tofile" parser = optparse.OptionParser(usage) parser.add_option("-c", action="store_true", default=False, help='Produce a context format diff (default)') parser.add_option("-u", action="store_true", default=False, help='Produce a unified format diff') parser.add_option("-m", action="store_true", default=False, help='Produce HTML side by side diff (can use -c and -l in conjunction)') parser.add_option("-n", action="store_true", default=False, help='Produce a ndiff format diff') parser.add_option("-l", "--lines", type="int", default=3, help='Set number of context lines (default 3)') (options, args) = parser.parse_args() if len(args) == 0: parser.print_help() sys.exit(1) if len(args) != 2: parser.error("need to specify both a fromfile and tofile") n = options.lines fromfile, tofile = args fromdate = time.ctime(os.stat(fromfile).st_mtime) todate = time.ctime(os.stat(tofile).st_mtime) with open(fromfile, 'U') as f: fromlines = f.readlines() with open(tofile, 'U') as f: tolines = f.readlines() if options.u: diff = difflib.unified_diff(fromlines, tolines, fromfile, tofile, fromdate, todate, n=n) elif options.n: diff = difflib.ndiff(fromlines, tolines) elif options.m: diff = difflib.HtmlDiff().make_file(fromlines,tolines,fromfile,tofile,context=options.c,numlines=n) else: diff = difflib.context_diff(fromlines, tolines, fromfile, tofile, fromdate, todate, n=n) sys.stdout.writelines(diff) if __name__ == '__main__': main()
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