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# Copyright (C) 2004, 2005, 2006 Canonical Ltd.
#
# 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
import errno
import os
import subprocess
import sys
import tempfile
import time
# compatability - plugins import compare_trees from diff!!!
# deprecated as of 0.10
from bzrlib.delta import compare_trees
from bzrlib.errors import BzrError
import bzrlib.errors as errors
import bzrlib.osutils
from bzrlib.patiencediff import unified_diff
import bzrlib.patiencediff
from bzrlib.symbol_versioning import (deprecated_function,
zero_eight)
from bzrlib.textfile import check_text_lines
from bzrlib.trace import mutter, warning
# 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_filename, oldlines, new_filename, newlines, to_file,
allow_binary=False, sequence_matcher=None,
path_encoding='utf8'):
# 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
if allow_binary is False:
check_text_lines(oldlines)
check_text_lines(newlines)
if sequence_matcher is None:
sequence_matcher = bzrlib.patiencediff.PatienceSequenceMatcher
ud = unified_diff(oldlines, newlines,
fromfile=old_filename.encode(path_encoding),
tofile=new_filename.encode(path_encoding),
sequencematcher=sequence_matcher)
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_filename, oldlines, new_filename, newlines, to_file,
diff_opts):
"""Display a diff by calling out to the external diff program."""
if hasattr(to_file, 'fileno'):
out_file = to_file
have_fileno = True
else:
out_file = subprocess.PIPE
have_fileno = False
# make sure our own output is properly ordered before the diff
to_file.flush()
oldtmp_fd, old_abspath = tempfile.mkstemp(prefix='bzr-diff-old-')
newtmp_fd, new_abspath = tempfile.mkstemp(prefix='bzr-diff-new-')
oldtmpf = os.fdopen(oldtmp_fd, 'wb')
newtmpf = os.fdopen(newtmp_fd, 'wb')
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.close()
newtmpf.close()
if not diff_opts:
diff_opts = []
diffcmd = ['diff',
'--label', old_filename,
old_abspath,
'--label', new_filename,
new_abspath,
'--binary',
]
# 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)
try:
pipe = subprocess.Popen(diffcmd,
stdin=subprocess.PIPE,
stdout=out_file)
except OSError, e:
if e.errno == errno.ENOENT:
raise errors.NoDiff(str(e))
raise
pipe.stdin.close()
if not have_fileno:
bzrlib.osutils.pumpfile(pipe.stdout, to_file)
rc = pipe.wait()
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()
# Clean up. Warn in case the files couldn't be deleted
# (in case windows still holds the file open, but not
# if the files have already been deleted)
try:
os.remove(old_abspath)
except OSError, e:
if e.errno not in (errno.ENOENT,):
warning('Failed to delete temporary file: %s %s',
old_abspath, e)
try:
os.remove(new_abspath)
except OSError:
if e.errno not in (errno.ENOENT,):
warning('Failed to delete temporary file: %s %s',
new_abspath, e)
@deprecated_function(zero_eight)
def show_diff(b, from_spec, specific_files, external_diff_options=None,
revision2=None, output=None, b2=None):
"""Shortcut for showing the diff to the working tree.
Please use show_diff_trees instead.
b
Branch.
revision
None for 'basis tree', 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:
output = sys.stdout
if from_spec is None:
old_tree = b.bzrdir.open_workingtree()
if b2 is None:
old_tree = old_tree = old_tree.basis_tree()
else:
old_tree = b.repository.revision_tree(from_spec.in_history(b).rev_id)
if revision2 is None:
if b2 is None:
new_tree = b.bzrdir.open_workingtree()
else:
new_tree = b2.bzrdir.open_workingtree()
else:
new_tree = b.repository.revision_tree(revision2.in_history(b).rev_id)
return show_diff_trees(old_tree, new_tree, output, specific_files,
external_diff_options)
def diff_cmd_helper(tree, specific_files, external_diff_options,
old_revision_spec=None, new_revision_spec=None,
old_label='a/', new_label='b/'):
"""Helper for cmd_diff.
tree
A WorkingTree
specific_files
The specific files to compare, or None
external_diff_options
If non-None, run an external diff, and pass it these options
old_revision_spec
If None, use basis tree as old revision, otherwise use the tree for
the specified revision.
new_revision_spec
If None, use working tree as new revision, otherwise use the tree for
the specified revision.
The more general form is show_diff_trees(), where the caller
supplies any two trees.
"""
def spec_tree(spec):
if tree:
revision = spec.in_store(tree.branch)
else:
revision = spec.in_store(None)
revision_id = revision.rev_id
branch = revision.branch
return branch.repository.revision_tree(revision_id)
if old_revision_spec is None:
old_tree = tree.basis_tree()
else:
old_tree = spec_tree(old_revision_spec)
if new_revision_spec is None:
new_tree = tree
else:
new_tree = spec_tree(new_revision_spec)
if new_tree is not tree:
extra_trees = (tree,)
else:
extra_trees = None
return show_diff_trees(old_tree, new_tree, sys.stdout, specific_files,
external_diff_options,
old_label=old_label, new_label=new_label,
extra_trees=extra_trees)
def show_diff_trees(old_tree, new_tree, to_file, specific_files=None,
external_diff_options=None,
old_label='a/', new_label='b/',
extra_trees=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.
extra_trees
If set, more Trees to use for looking up file ids
"""
old_tree.lock_read()
try:
new_tree.lock_read()
try:
return _show_diff_trees(old_tree, new_tree, to_file,
specific_files, external_diff_options,
old_label=old_label, new_label=new_label,
extra_trees=extra_trees)
finally:
new_tree.unlock()
finally:
old_tree.unlock()
def _show_diff_trees(old_tree, new_tree, to_file,
specific_files, external_diff_options,
old_label='a/', new_label='b/', extra_trees=None):
# GNU Patch uses the epoch date to detect files that are being added
# or removed in a diff.
EPOCH_DATE = '1970-01-01 00:00:00 +0000'
# 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 = new_tree.changes_from(old_tree,
specific_files=specific_files,
extra_trees=extra_trees, require_versioned=True)
has_changes = 0
for path, file_id, kind in delta.removed:
has_changes = 1
print >>to_file, '=== removed %s %r' % (kind, path.encode('utf8'))
old_name = '%s%s\t%s' % (old_label, path,
_patch_header_date(old_tree, file_id, path))
new_name = '%s%s\t%s' % (new_label, path, EPOCH_DATE)
old_tree.inventory[file_id].diff(diff_file, old_name, old_tree,
new_name, None, None, to_file)
for path, file_id, kind in delta.added:
has_changes = 1
print >>to_file, '=== added %s %r' % (kind, path.encode('utf8'))
old_name = '%s%s\t%s' % (old_label, path, EPOCH_DATE)
new_name = '%s%s\t%s' % (new_label, path,
_patch_header_date(new_tree, file_id, path))
new_tree.inventory[file_id].diff(diff_file, new_name, new_tree,
old_name, None, None, to_file,
reverse=True)
for (old_path, new_path, file_id, kind,
text_modified, meta_modified) in delta.renamed:
has_changes = 1
prop_str = get_prop_change(meta_modified)
print >>to_file, '=== renamed %s %r => %r%s' % (
kind, old_path.encode('utf8'),
new_path.encode('utf8'), prop_str)
old_name = '%s%s\t%s' % (old_label, old_path,
_patch_header_date(old_tree, file_id,
old_path))
new_name = '%s%s\t%s' % (new_label, new_path,
_patch_header_date(new_tree, file_id,
new_path))
_maybe_diff_file_or_symlink(old_name, old_tree, file_id,
new_name, new_tree,
text_modified, kind, to_file, diff_file)
for path, file_id, kind, text_modified, meta_modified in delta.modified:
has_changes = 1
prop_str = get_prop_change(meta_modified)
print >>to_file, '=== modified %s %r%s' % (kind, path.encode('utf8'), prop_str)
old_name = '%s%s\t%s' % (old_label, path,
_patch_header_date(old_tree, file_id, path))
new_name = '%s%s\t%s' % (new_label, path,
_patch_header_date(new_tree, file_id, path))
if text_modified:
_maybe_diff_file_or_symlink(old_name, old_tree, file_id,
new_name, new_tree,
True, kind, to_file, diff_file)
return has_changes
def _patch_header_date(tree, file_id, path):
"""Returns a timestamp suitable for use in a patch header."""
tm = time.gmtime(tree.get_file_mtime(file_id, path))
return time.strftime('%Y-%m-%d %H:%M:%S +0000', tm)
def _raise_if_nonexistent(paths, old_tree, new_tree):
"""Complain if paths are not in either inventory or tree.
It's OK with the files exist in either tree's inventory, or
if they exist in the tree but are not versioned.
This can be used by operations such as bzr status that can accept
unknown or ignored files.
"""
mutter("check paths: %r", paths)
if not paths:
return
s = old_tree.filter_unversioned_files(paths)
s = new_tree.filter_unversioned_files(s)
s = [path for path in s if not new_tree.has_filename(path)]
if s:
raise errors.PathsDoNotExist(sorted(s))
def get_prop_change(meta_modified):
if meta_modified:
return " (properties changed)"
else:
return ""
def _maybe_diff_file_or_symlink(old_path, old_tree, file_id,
new_path, new_tree, text_modified,
kind, to_file, diff_file):
if text_modified:
new_entry = new_tree.inventory[file_id]
old_tree.inventory[file_id].diff(diff_file,
old_path, old_tree,
new_path, new_entry,
new_tree, to_file)
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