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134 lines
3.9 KiB
134 lines
3.9 KiB
#! /usr/bin/env python3
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# Module ndiff version 1.7.0
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# Released to the public domain 08-Dec-2000,
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# by Tim Peters (tim.one@home.com).
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# Provided as-is; use at your own risk; no warranty; no promises; enjoy!
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# ndiff.py is now simply a front-end to the difflib.ndiff() function.
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# Originally, it contained the difflib.SequenceMatcher class as well.
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# This completes the raiding of reusable code from this formerly
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# self-contained script.
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"""ndiff [-q] file1 file2
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or
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ndiff (-r1 | -r2) < ndiff_output > file1_or_file2
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Print a human-friendly file difference report to stdout. Both inter-
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and intra-line differences are noted. In the second form, recreate file1
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(-r1) or file2 (-r2) on stdout, from an ndiff report on stdin.
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In the first form, if -q ("quiet") is not specified, the first two lines
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of output are
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-: file1
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+: file2
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Each remaining line begins with a two-letter code:
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"- " line unique to file1
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"+ " line unique to file2
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" " line common to both files
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"? " line not present in either input file
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Lines beginning with "? " attempt to guide the eye to intraline
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differences, and were not present in either input file. These lines can be
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confusing if the source files contain tab characters.
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The first file can be recovered by retaining only lines that begin with
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" " or "- ", and deleting those 2-character prefixes; use ndiff with -r1.
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The second file can be recovered similarly, but by retaining only " " and
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"+ " lines; use ndiff with -r2; or, on Unix, the second file can be
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recovered by piping the output through
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sed -n '/^[+ ] /s/^..//p'
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"""
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__version__ = 1, 7, 0
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import difflib, sys
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def fail(msg):
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out = sys.stderr.write
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out(msg + "\n\n")
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out(__doc__)
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return 0
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# open a file & return the file object; gripe and return 0 if it
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# couldn't be opened
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def fopen(fname):
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try:
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return open(fname)
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except IOError as detail:
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return fail("couldn't open " + fname + ": " + str(detail))
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# open two files & spray the diff to stdout; return false iff a problem
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def fcompare(f1name, f2name):
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f1 = fopen(f1name)
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f2 = fopen(f2name)
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if not f1 or not f2:
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return 0
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a = f1.readlines(); f1.close()
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b = f2.readlines(); f2.close()
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for line in difflib.ndiff(a, b):
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print(line, end=' ')
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return 1
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# crack args (sys.argv[1:] is normal) & compare;
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# return false iff a problem
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def main(args):
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import getopt
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try:
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opts, args = getopt.getopt(args, "qr:")
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except getopt.error as detail:
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return fail(str(detail))
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noisy = 1
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qseen = rseen = 0
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for opt, val in opts:
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if opt == "-q":
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qseen = 1
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noisy = 0
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elif opt == "-r":
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rseen = 1
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whichfile = val
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if qseen and rseen:
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return fail("can't specify both -q and -r")
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if rseen:
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if args:
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return fail("no args allowed with -r option")
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if whichfile in ("1", "2"):
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restore(whichfile)
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return 1
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return fail("-r value must be 1 or 2")
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if len(args) != 2:
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return fail("need 2 filename args")
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f1name, f2name = args
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if noisy:
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print('-:', f1name)
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print('+:', f2name)
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return fcompare(f1name, f2name)
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# read ndiff output from stdin, and print file1 (which=='1') or
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# file2 (which=='2') to stdout
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def restore(which):
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restored = difflib.restore(sys.stdin.readlines(), which)
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sys.stdout.writelines(restored)
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if __name__ == '__main__':
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args = sys.argv[1:]
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if "-profile" in args:
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import profile, pstats
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args.remove("-profile")
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statf = "ndiff.pro"
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profile.run("main(args)", statf)
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stats = pstats.Stats(statf)
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stats.strip_dirs().sort_stats('time').print_stats()
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else:
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main(args)
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