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#!/usr/bin/env python
#
# scons-diff.py - diff-like utility for comparing SCons trees
#
# This supports most common diff options (with some quirks, like you can't
# just say -c and have it use a default value), but canonicalizes the
# various version strings within the file like __revision__, __build__,
# etc. so that you can diff trees without having to ignore changes in
# version lines.
#
import difflib
import getopt
import os.path
import re
import sys
Usage = """\
Usage: scons-diff.py [OPTIONS] dir1 dir2
Options:
-c NUM, --context=NUM Print NUM lines of copied context.
-h, --help Print this message and exit.
-n Don't canonicalize SCons lines.
-q, --quiet Print only whether files differ.
-r, --recursive Recursively compare found subdirectories.
-s Report when two files are the same.
-u NUM, --unified=NUM Print NUM lines of unified context.
"""
opts, args = getopt.getopt(sys.argv[1:],
'c:dhnqrsu:',
['context=', 'help', 'recursive', 'unified='])
diff_type = None
edit_type = None
context = 2
recursive = False
report_same = False
diff_options = []
def diff_line(left, right):
if diff_options:
opts = ' ' + ' '.join(diff_options)
else:
opts = ''
print 'diff%s %s %s' % (opts, left, right)
for o, a in opts:
if o in ('-c', '-u'):
diff_type = o
context = int(a)
diff_options.append(o)
elif o in ('-h', '--help'):
print Usage
sys.exit(0)
elif o in ('-n'):
diff_options.append(o)
edit_type = o
elif o in ('-q'):
diff_type = o
diff_line = lambda l, r: None
elif o in ('-r', '--recursive'):
recursive = True
diff_options.append(o)
elif o in ('-s'):
report_same = True
try:
left, right = args
except ValueError:
sys.stderr.write(Usage)
sys.exit(1)
def quiet_diff(a, b, fromfile='', tofile='',
fromfiledate='', tofiledate='', n=3, lineterm='\n'):
"""
A function with the same calling signature as difflib.context_diff
(diff -c) and difflib.unified_diff (diff -u) but which prints
output like the simple, unadorned 'diff" command.
"""
if a == b:
return []
else:
return ['Files %s and %s differ\n' % (fromfile, tofile)]
def simple_diff(a, b, fromfile='', tofile='',
fromfiledate='', tofiledate='', n=3, lineterm='\n'):
"""
A function with the same calling signature as difflib.context_diff
(diff -c) and difflib.unified_diff (diff -u) but which prints
output like the simple, unadorned 'diff" command.
"""
sm = difflib.SequenceMatcher(None, a, b)
def comma(x1, x2):
return x1+1 == x2 and str(x2) or '%s,%s' % (x1+1, x2)
result = []
for op, a1, a2, b1, b2 in sm.get_opcodes():
if op == 'delete':
result.append("%sd%d\n" % (comma(a1, a2), b1))
result.extend(['< ' + l for l in a[a1:a2]])
elif op == 'insert':
result.append("%da%s\n" % (a1, comma(b1, b2)))
result.extend(['> ' + l for l in b[b1:b2]])
elif op == 'replace':
result.append("%sc%s\n" % (comma(a1, a2), comma(b1, b2)))
result.extend(['< ' + l for l in a[a1:a2]])
result.append('---\n')
result.extend(['> ' + l for l in b[b1:b2]])
return result
diff_map = {
'-c' : difflib.context_diff,
'-q' : quiet_diff,
'-u' : difflib.unified_diff,
}
diff_function = diff_map.get(diff_type, simple_diff)
baseline_re = re.compile('(# |@REM )/home/\S+/baseline/')
comment_rev_re = re.compile('(# |@REM )(\S+) 0.96.[CD]\d+ \S+ \S+( knight)')
revision_re = re.compile('__revision__ = "[^"]*"')
build_re = re.compile('__build__ = "[^"]*"')
date_re = re.compile('__date__ = "[^"]*"')
def lines_read(file):
return open(file).readlines()
def lines_massage(file):
text = open(file).read()
text = baseline_re.sub('\\1', text)
text = comment_rev_re.sub('\\1\\2\\3', text)
text = revision_re.sub('__revision__ = "bin/scons-diff.py"', text)
text = build_re.sub('__build__ = "0.96.92.DXXX"', text)
text = date_re.sub('__date__ = "2006/08/25 02:59:00"', text)
return text.splitlines(1)
lines_map = {
'-n' : lines_read,
}
lines_function = lines_map.get(edit_type, lines_massage)
def do_diff(left, right, diff_subdirs):
if os.path.isfile(left) and os.path.isfile(right):
diff_file(left, right)
elif not os.path.isdir(left):
diff_file(left, os.path.join(right, os.path.split(left)[1]))
elif not os.path.isdir(right):
diff_file(os.path.join(left, os.path.split(right)[1]), right)
elif diff_subdirs:
diff_dir(left, right)
def diff_file(left, right):
l = lines_function(left)
r = lines_function(right)
d = diff_function(l, r, left, right, context)
try:
text = ''.join(d)
except IndexError:
sys.stderr.write('IndexError diffing %s and %s\n' % (left, right))
else:
if text:
diff_line(left, right)
print text,
elif report_same:
print 'Files %s and %s are identical' % (left, right)
def diff_dir(left, right):
llist = os.listdir(left)
rlist = os.listdir(right)
u = {}
for l in llist:
u[l] = 1
for r in rlist:
u[r] = 1
for x in sorted([ x for x in u.keys() if x[-4:] != '.pyc' ]):
if x in llist:
if x in rlist:
do_diff(os.path.join(left, x),
os.path.join(right, x),
recursive)
else:
print 'Only in %s: %s' % (left, x)
else:
print 'Only in %s: %s' % (right, x)
do_diff(left, right, True)
# Local Variables:
# tab-width:4
# indent-tabs-mode:nil
# End:
# vim: set expandtab tabstop=4 shiftwidth=4:
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