Tools/scripts/diff.py

   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()