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#! /usr/bin/env python
# -*- coding: UTF-8 -*-
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
from bzrlib.trace import mutter
from bzrlib.errors import BzrError
from bzrlib.delta import compare_trees
# TODO: Rather than building a changeset object, we should probably
# invoke callbacks on an object. That object can either accumulate a
# list, write them out directly, etc etc.
def internal_diff(old_label, oldlines, new_label, newlines, to_file):
import difflib
# FIXME: difflib is wrong if there is no trailing newline.
# The syntax used by patch seems to be "\ No newline at
# end of file" following the last diff line from that
# file. This is not trivial to insert into the
# unified_diff output and it might be better to just fix
# or replace that function.
# In the meantime we at least make sure the patch isn't
# mangled.
# Special workaround for Python2.3, where difflib fails if
# both sequences are empty.
if not oldlines and not newlines:
return
ud = difflib.unified_diff(oldlines, newlines,
fromfile=old_label, tofile=new_label)
ud = list(ud)
# work-around for difflib being too smart for its own good
# if /dev/null is "1,0", patch won't recognize it as /dev/null
if not oldlines:
ud[2] = ud[2].replace('-1,0', '-0,0')
elif not newlines:
ud[2] = ud[2].replace('+1,0', '+0,0')
# work around for difflib emitting random spaces after the label
ud[0] = ud[0][:-2] + '\n'
ud[1] = ud[1][:-2] + '\n'
for line in ud:
to_file.write(line)
if not line.endswith('\n'):
to_file.write("\n\\ No newline at end of file\n")
print >>to_file
def external_diff(old_label, oldlines, new_label, newlines, to_file,
diff_opts):
"""Display a diff by calling out to the external diff program."""
import sys
if to_file != sys.stdout:
raise NotImplementedError("sorry, can't send external diff other than to stdout yet",
to_file)
# make sure our own output is properly ordered before the diff
to_file.flush()
from tempfile import NamedTemporaryFile
import os
oldtmpf = NamedTemporaryFile()
newtmpf = NamedTemporaryFile()
try:
# TODO: perhaps a special case for comparing to or from the empty
# sequence; can just use /dev/null on Unix
# TODO: if either of the files being compared already exists as a
# regular named file (e.g. in the working directory) then we can
# compare directly to that, rather than copying it.
oldtmpf.writelines(oldlines)
newtmpf.writelines(newlines)
oldtmpf.flush()
newtmpf.flush()
if not diff_opts:
diff_opts = []
diffcmd = ['diff',
'--label', old_label,
oldtmpf.name,
'--label', new_label,
newtmpf.name]
# diff only allows one style to be specified; they don't override.
# note that some of these take optargs, and the optargs can be
# directly appended to the options.
# this is only an approximate parser; it doesn't properly understand
# the grammar.
for s in ['-c', '-u', '-C', '-U',
'-e', '--ed',
'-q', '--brief',
'--normal',
'-n', '--rcs',
'-y', '--side-by-side',
'-D', '--ifdef']:
for j in diff_opts:
if j.startswith(s):
break
else:
continue
break
else:
diffcmd.append('-u')
if diff_opts:
diffcmd.extend(diff_opts)
rc = os.spawnvp(os.P_WAIT, 'diff', diffcmd)
if rc != 0 and rc != 1:
# returns 1 if files differ; that's OK
if rc < 0:
msg = 'signal %d' % (-rc)
else:
msg = 'exit code %d' % rc
raise BzrError('external diff failed with %s; command: %r' % (rc, diffcmd))
finally:
oldtmpf.close() # and delete
newtmpf.close()
def show_diff(b, revision, specific_files, external_diff_options=None,
revision2=None, output=None):
"""Shortcut for showing the diff to the working tree.
b
Branch.
revision
None for each, or otherwise the old revision to compare against.
The more general form is show_diff_trees(), where the caller
supplies any two trees.
"""
if output is None:
import sys
output = sys.stdout
if revision == None:
old_tree = b.basis_tree()
else:
old_tree = b.revision_tree(b.lookup_revision(revision))
if revision2 == None:
new_tree = b.working_tree()
else:
new_tree = b.revision_tree(b.lookup_revision(revision2))
show_diff_trees(old_tree, new_tree, output, specific_files,
external_diff_options)
def show_diff_trees(old_tree, new_tree, to_file, specific_files=None,
external_diff_options=None):
"""Show in text form the changes from one tree to another.
to_files
If set, include only changes to these files.
external_diff_options
If set, use an external GNU diff and pass these options.
"""
# TODO: Options to control putting on a prefix or suffix, perhaps as a format string
old_label = ''
new_label = ''
DEVNULL = '/dev/null'
# Windows users, don't panic about this filename -- it is a
# special signal to GNU patch that the file should be created or
# deleted respectively.
# TODO: Generation of pseudo-diffs for added/deleted files could
# be usefully made into a much faster special case.
if external_diff_options:
assert isinstance(external_diff_options, basestring)
opts = external_diff_options.split()
def diff_file(olab, olines, nlab, nlines, to_file):
external_diff(olab, olines, nlab, nlines, to_file, opts)
else:
diff_file = internal_diff
delta = compare_trees(old_tree, new_tree, want_unchanged=False,
specific_files=specific_files)
for path, file_id, kind in delta.removed:
print >>to_file, '=== removed %s %r' % (kind, path)
if kind == 'file':
diff_file(old_label + path,
old_tree.get_file(file_id).readlines(),
DEVNULL,
[],
to_file)
for path, file_id, kind in delta.added:
print >>to_file, '=== added %s %r' % (kind, path)
if kind == 'file':
diff_file(DEVNULL,
[],
new_label + path,
new_tree.get_file(file_id).readlines(),
to_file)
for old_path, new_path, file_id, kind, text_modified in delta.renamed:
print >>to_file, '=== renamed %s %r => %r' % (kind, old_path, new_path)
if text_modified:
diff_file(old_label + old_path,
old_tree.get_file(file_id).readlines(),
new_label + new_path,
new_tree.get_file(file_id).readlines(),
to_file)
for path, file_id, kind in delta.modified:
print >>to_file, '=== modified %s %r' % (kind, path)
if kind == 'file':
diff_file(old_label + path,
old_tree.get_file(file_id).readlines(),
new_label + path,
new_tree.get_file(file_id).readlines(),
to_file)
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