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+#! /usr/bin/env python
+
+# Module ndiff version 1.7.0
+# Released to the public domain 08-Dec-2000,
+# by Tim Peters (tim.one@home.com).
+
+# Provided as-is; use at your own risk; no warranty; no promises; enjoy!
+
+# ndiff.py is now simply a front-end to the difflib.ndiff() function.
+# Originally, it contained the difflib.SequenceMatcher class as well.
+# This completes the raiding of reusable code from this formerly
+# self-contained script.
+
+"""ndiff [-q] file1 file2
+ or
+ndiff (-r1 | -r2) < ndiff_output > file1_or_file2
+
+Print a human-friendly file difference report to stdout. Both inter-
+and intra-line differences are noted. In the second form, recreate file1
+(-r1) or file2 (-r2) on stdout, from an ndiff report on stdin.
+
+In the first form, if -q ("quiet") is not specified, the first two lines
+of output are
+
+-: file1
++: file2
+
+Each remaining line begins with a two-letter code:
+
+ "- " line unique to file1
+ "+ " line unique to file2
+ " " line common to both files
+ "? " line not present in either input file
+
+Lines beginning with "? " attempt to guide the eye to intraline
+differences, and were not present in either input file. These lines can be
+confusing if the source files contain tab characters.
+
+The first file can be recovered by retaining only lines that begin with
+" " or "- ", and deleting those 2-character prefixes; use ndiff with -r1.
+
+The second file can be recovered similarly, but by retaining only " " and
+"+ " lines; use ndiff with -r2; or, on Unix, the second file can be
+recovered by piping the output through
+
+ sed -n '/^[+ ] /s/^..//p'
+"""
+
+__version__ = 1, 7, 0
+
+import difflib, sys
+
+def fail(msg):
+ out = sys.stderr.write
+ out(msg + "\n\n")
+ out(__doc__)
+ return 0
+
+# open a file & return the file object; gripe and return 0 if it
+# couldn't be opened
+def fopen(fname):
+ try:
+ return open(fname, 'U')
+ except IOError, detail:
+ return fail("couldn't open " + fname + ": " + str(detail))
+
+# open two files & spray the diff to stdout; return false iff a problem
+def fcompare(f1name, f2name):
+ f1 = fopen(f1name)
+ f2 = fopen(f2name)
+ if not f1 or not f2:
+ return 0
+
+ a = f1.readlines(); f1.close()
+ b = f2.readlines(); f2.close()
+ for line in difflib.ndiff(a, b):
+ print line,
+
+ return 1
+
+# crack args (sys.argv[1:] is normal) & compare;
+# return false iff a problem
+
+def main(args):
+ import getopt
+ try:
+ opts, args = getopt.getopt(args, "qr:")
+ except getopt.error, detail:
+ return fail(str(detail))
+ noisy = 1
+ qseen = rseen = 0
+ for opt, val in opts:
+ if opt == "-q":
+ qseen = 1
+ noisy = 0
+ elif opt == "-r":
+ rseen = 1
+ whichfile = val
+ if qseen and rseen:
+ return fail("can't specify both -q and -r")
+ if rseen:
+ if args:
+ return fail("no args allowed with -r option")
+ if whichfile in ("1", "2"):
+ restore(whichfile)
+ return 1
+ return fail("-r value must be 1 or 2")
+ if len(args) != 2:
+ return fail("need 2 filename args")
+ f1name, f2name = args
+ if noisy:
+ print '-:', f1name
+ print '+:', f2name
+ return fcompare(f1name, f2name)
+
+# read ndiff output from stdin, and print file1 (which=='1') or
+# file2 (which=='2') to stdout
+
+def restore(which):
+ restored = difflib.restore(sys.stdin.readlines(), which)
+ sys.stdout.writelines(restored)
+
+if __name__ == '__main__':
+ args = sys.argv[1:]
+ if "-profile" in args:
+ import profile, pstats
+ args.remove("-profile")
+ statf = "ndiff.pro"
+ profile.run("main(args)", statf)
+ stats = pstats.Stats(statf)
+ stats.strip_dirs().sort_stats('time').print_stats()
+ else:
+ main(args)