1 """ Command line interface to difflib.py providing diffs in four formats: 2 3 * ndiff: lists every line and highlights interline changes. 4 * context: highlights clusters of changes in a before/after format. 5 * unified: highlights clusters of changes in an inline format. 6 * html: generates side by side comparison with change highlights. 7 8 """ 9 10 import sys, os, time, difflib, optparse 11 12 def main(): 13 14 usage = "usage: %prog [options] fromfile tofile" 15 parser = optparse.OptionParser(usage) 16 parser.add_option("-c", action="store_true", default=False, help='Produce a context format diff (default)') 17 parser.add_option("-u", action="store_true", default=False, help='Produce a unified format diff') 18 parser.add_option("-m", action="store_true", default=False, help='Produce HTML side by side diff (can use -c and -l in conjunction)') 19 parser.add_option("-n", action="store_true", default=False, help='Produce a ndiff format diff') 20 parser.add_option("-l", "--lines", type="int", default=3, help='Set number of context lines (default 3)') 21 (options, args) = parser.parse_args() 22 23 if len(args) == 0: 24 parser.print_help() 25 sys.exit(1) 26 if len(args) != 2: 27 parser.error("need to specify both a fromfile and tofile") 28 29 n = options.lines 30 fromfile, tofile = args 31 32 fromdate = time.ctime(os.stat(fromfile).st_mtime) 33 todate = time.ctime(os.stat(tofile).st_mtime) 34 fromlines = open(fromfile, 'U').readlines() 35 tolines = open(tofile, 'U').readlines() 36 37 if options.u: 38 diff = difflib.unified_diff(fromlines, tolines, fromfile, tofile, fromdate, todate, n=n) 39 elif options.n: 40 diff = difflib.ndiff(fromlines, tolines) 41 elif options.m: 42 diff = difflib.HtmlDiff().make_file(fromlines,tolines,fromfile,tofile,context=options.c,numlines=n) 43 else: 44 diff = difflib.context_diff(fromlines, tolines, fromfile, tofile, fromdate, todate, n=n) 45 46 sys.stdout.writelines(diff) 47 48 if __name__ == '__main__': 49 main() 50
