Hack ndiff to display lines w/ leading tabs more intuitively. This synchs
ndiff w/ a custom version I made for Guido during the pre-2.0 freeze.
diff --git a/Tools/scripts/ndiff.py b/Tools/scripts/ndiff.py
index 2323dd8..dd06d21 100755
--- a/Tools/scripts/ndiff.py
+++ b/Tools/scripts/ndiff.py
@@ -1,7 +1,7 @@
#! /usr/bin/env python
-# Module ndiff version 1.4.0
-# Released to the public domain 27-Mar-1999,
+# Module ndiff version 1.5.0
+# Released to the public domain 08-Oct-2000,
# by Tim Peters (tim_one@email.msn.com).
# Provided as-is; use at your own risk; no warranty; no promises; enjoy!
@@ -28,14 +28,14 @@
"? " 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.
+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
+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'
@@ -43,7 +43,7 @@
See module comments for details and programmatic interface.
"""
-__version__ = 1, 4, 0
+__version__ = 1, 5, 0
# SequenceMatcher tries to compute a "human-friendly diff" between
# two sequences (chiefly picturing a file as a sequence of lines,
@@ -514,8 +514,7 @@
elif lb < la:
btags = btags + ' ' * (la - lb)
combined = map(lambda x,y: _combine[x+y], atags, btags)
- print '-', aelt, '+', belt, '?', \
- string.rstrip(string.join(combined, ''))
+ printq(aelt, belt, string.rstrip(string.join(combined, '')))
else:
# the synch pair is identical
print ' ', aelt,
@@ -532,6 +531,22 @@
elif blo < bhi:
dump('+', b, blo, bhi)
+# Crap to deal with leading tabs in "?" output. Can hurt, but will
+# probably help most of the time.
+
+def printq(aline, bline, qline):
+ common = min(count_leading(aline, "\t"),
+ count_leading(bline, "\t"))
+ common = min(common, count_leading(qline[:common], " "))
+ qline = "\t" * common + qline[common:]
+ print '-', aline, '+', bline, '?', qline
+
+def count_leading(line, ch):
+ i, n = 0, len(line)
+ while i < n and line[i] == ch:
+ i += 1
+ return i
+
def fail(msg):
import sys
out = sys.stderr.write