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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 trace import mutter
from errors import BzrError
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
nonl = False
if oldlines and (oldlines[-1][-1] != '\n'):
oldlines[-1] += '\n'
nonl = True
if newlines and (newlines[-1][-1] != '\n'):
newlines[-1] += '\n'
nonl = True
ud = difflib.unified_diff(oldlines, newlines,
fromfile=old_label, tofile=new_label)
# 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 = list(ud)
ud[2] = ud[2].replace('-1,0', '-0,0')
elif not newlines:
ud = list(ud)
ud[2] = ud[2].replace('+1,0', '+0,0')
to_file.writelines(ud)
if nonl:
print >>to_file, "\\ No newline at end of file"
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):
"""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.
"""
import sys
if revision == None:
old_tree = b.basis_tree()
else:
old_tree = b.revision_tree(b.lookup_revision(revision))
new_tree = b.working_tree()
show_diff_trees(old_tree, new_tree, sys.stdout, 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 '*** 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 '*** 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 '*** 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 '*** 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)
class TreeDelta(object):
"""Describes changes from one tree to another.
Contains four lists:
added
(path, id, kind)
removed
(path, id, kind)
renamed
(oldpath, newpath, id, kind, text_modified)
modified
(path, id, kind)
unchanged
(path, id, kind)
Each id is listed only once.
Files that are both modified and renamed are listed only in
renamed, with the text_modified flag true.
The lists are normally sorted when the delta is created.
"""
def __init__(self):
self.added = []
self.removed = []
self.renamed = []
self.modified = []
self.unchanged = []
def has_changed(self):
changes = len(self.added) + len(self.removed) + len(self.renamed)
changes += len(self.modified)
return (changes != 0)
def touches_file_id(self, file_id):
"""Return True if file_id is modified by this delta."""
for l in self.added, self.removed, self.modified:
for v in l:
if v[1] == file_id:
return True
for v in self.renamed:
if v[2] == file_id:
return True
return False
def show(self, to_file, show_ids=False, show_unchanged=False):
def show_list(files):
for path, fid, kind in files:
if kind == 'directory':
path += '/'
elif kind == 'symlink':
path += '@'
if show_ids:
print >>to_file, ' %-30s %s' % (path, fid)
else:
print >>to_file, ' ', path
if self.removed:
print >>to_file, 'removed:'
show_list(self.removed)
if self.added:
print >>to_file, 'added:'
show_list(self.added)
if self.renamed:
print >>to_file, 'renamed:'
for oldpath, newpath, fid, kind, text_modified in self.renamed:
if show_ids:
print >>to_file, ' %s => %s %s' % (oldpath, newpath, fid)
else:
print >>to_file, ' %s => %s' % (oldpath, newpath)
if self.modified:
print >>to_file, 'modified:'
show_list(self.modified)
if show_unchanged and self.unchanged:
print >>to_file, 'unchanged:'
show_list(self.unchanged)
def compare_trees(old_tree, new_tree, want_unchanged, specific_files=None):
"""Describe changes from one tree to another.
Returns a TreeDelta with details of added, modified, renamed, and
deleted entries.
The root entry is specifically exempt.
This only considers versioned files.
want_unchanged
If true, also list files unchanged from one version to
the next.
specific_files
If true, only check for changes to specified names or
files within them.
"""
from osutils import is_inside_any
old_inv = old_tree.inventory
new_inv = new_tree.inventory
delta = TreeDelta()
mutter('start compare_trees')
# TODO: match for specific files can be rather smarter by finding
# the IDs of those files up front and then considering only that.
for file_id in old_tree:
if file_id in new_tree:
kind = old_inv.get_file_kind(file_id)
assert kind == new_inv.get_file_kind(file_id)
assert kind in ('file', 'directory', 'symlink', 'root_directory'), \
'invalid file kind %r' % kind
if kind == 'root_directory':
continue
old_path = old_inv.id2path(file_id)
new_path = new_inv.id2path(file_id)
if specific_files:
if (not is_inside_any(specific_files, old_path)
and not is_inside_any(specific_files, new_path)):
continue
if kind == 'file':
old_sha1 = old_tree.get_file_sha1(file_id)
new_sha1 = new_tree.get_file_sha1(file_id)
text_modified = (old_sha1 != new_sha1)
else:
## mutter("no text to check for %r %r" % (file_id, kind))
text_modified = False
# TODO: Can possibly avoid calculating path strings if the
# two files are unchanged and their names and parents are
# the same and the parents are unchanged all the way up.
# May not be worthwhile.
if old_path != new_path:
delta.renamed.append((old_path, new_path, file_id, kind,
text_modified))
elif text_modified:
delta.modified.append((new_path, file_id, kind))
elif want_unchanged:
delta.unchanged.append((new_path, file_id, kind))
else:
kind = old_inv.get_file_kind(file_id)
old_path = old_inv.id2path(file_id)
if specific_files:
if not is_inside_any(specific_files, old_path):
continue
delta.removed.append((old_path, file_id, kind))
mutter('start looking for new files')
for file_id in new_inv:
if file_id in old_inv:
continue
new_path = new_inv.id2path(file_id)
if specific_files:
if not is_inside_any(specific_files, new_path):
continue
kind = new_inv.get_file_kind(file_id)
delta.added.append((new_path, file_id, kind))
delta.removed.sort()
delta.added.sort()
delta.renamed.sort()
delta.modified.sort()
delta.unchanged.sort()
return delta
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