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- Committer: Martin Pool
- Date: 2005-06-22 06:38:18 UTC
- Revision ID: mbp@sourcefrog.net-20050622063818-cd8d21b14bd4b636
- add plugin patch, still being integrated
- files added:
- bzr-man.py
- bzrlib/selftest
- patches
- files removed:
- bzrlib/tests.py
- files renamed:
- contrib/bash/bzr => contrib/bash/bzr.simple
- files modified:
- .bzrignore
added
removed
bzrlib/diff.py
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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from sets import Set
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from trace import mutter
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def diff_trees(old_tree, new_tree):
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"""Compute diff between two trees.
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They may be in different branches and may be working or historical
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trees.
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Yields a sequence of (state, id, old_name, new_name, kind).
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Each filename and each id is listed only once.
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from errors import BzrError
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def internal_diff(old_label, oldlines, new_label, newlines, to_file):
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import difflib
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# FIXME: difflib is wrong if there is no trailing newline.
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# The syntax used by patch seems to be "\ No newline at
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# end of file" following the last diff line from that
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# file. This is not trivial to insert into the
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# unified_diff output and it might be better to just fix
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# or replace that function.
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# In the meantime we at least make sure the patch isn't
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# mangled.
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# Special workaround for Python2.3, where difflib fails if
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# both sequences are empty.
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if not oldlines and not newlines:
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return
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nonl = False
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if oldlines and (oldlines[-1][-1] != '\n'):
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oldlines[-1] += '\n'
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nonl = True
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if newlines and (newlines[-1][-1] != '\n'):
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newlines[-1] += '\n'
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nonl = True
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ud = difflib.unified_diff(oldlines, newlines,
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fromfile=old_label, tofile=new_label)
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# work-around for difflib being too smart for its own good
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# if /dev/null is "1,0", patch won't recognize it as /dev/null
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if not oldlines:
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ud = list(ud)
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ud[2] = ud[2].replace('-1,0', '-0,0')
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elif not newlines:
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ud = list(ud)
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ud[2] = ud[2].replace('+1,0', '+0,0')
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to_file.writelines(ud)
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if nonl:
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print >>to_file, "\\ No newline at end of file"
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print >>to_file
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def external_diff(old_label, oldlines, new_label, newlines, to_file,
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diff_opts):
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"""Display a diff by calling out to the external diff program."""
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import sys
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if to_file != sys.stdout:
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raise NotImplementedError("sorry, can't send external diff other than to stdout yet",
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to_file)
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# make sure our own output is properly ordered before the diff
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to_file.flush()
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from tempfile import NamedTemporaryFile
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import os
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oldtmpf = NamedTemporaryFile()
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newtmpf = NamedTemporaryFile()
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try:
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# TODO: perhaps a special case for comparing to or from the empty
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# sequence; can just use /dev/null on Unix
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# TODO: if either of the files being compared already exists as a
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# regular named file (e.g. in the working directory) then we can
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# compare directly to that, rather than copying it.
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oldtmpf.writelines(oldlines)
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newtmpf.writelines(newlines)
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oldtmpf.flush()
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newtmpf.flush()
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if not diff_opts:
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diff_opts = []
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diffcmd = ['diff',
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'--label', old_label,
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oldtmpf.name,
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'--label', new_label,
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newtmpf.name]
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# diff only allows one style to be specified; they don't override.
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# note that some of these take optargs, and the optargs can be
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# directly appended to the options.
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# this is only an approximate parser; it doesn't properly understand
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# the grammar.
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for s in ['-c', '-u', '-C', '-U',
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'-e', '--ed',
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'-q', '--brief',
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'--normal',
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'-n', '--rcs',
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'-y', '--side-by-side',
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'-D', '--ifdef']:
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for j in diff_opts:
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if j.startswith(s):
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break
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else:
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continue
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break
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else:
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diffcmd.append('-u')
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if diff_opts:
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diffcmd.extend(diff_opts)
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rc = os.spawnvp(os.P_WAIT, 'diff', diffcmd)
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if rc != 0 and rc != 1:
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# returns 1 if files differ; that's OK
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if rc < 0:
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msg = 'signal %d' % (-rc)
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else:
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msg = 'exit code %d' % rc
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raise BzrError('external diff failed with %s; command: %r' % (rc, diffcmd))
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finally:
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oldtmpf.close() # and delete
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newtmpf.close()
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def show_diff(b, revision, specific_files, external_diff_options=None):
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"""Shortcut for showing the diff to the working tree.
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b
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Branch.
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revision
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None for each, or otherwise the old revision to compare against.
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The more general form is show_diff_trees(), where the caller
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supplies any two trees.
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"""
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## TODO: Compare files before diffing; only mention those that have changed
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## TODO: Set nice names in the headers, maybe include diffstat
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## TODO: Perhaps make this a generator rather than using
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## a callback object?
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## TODO: Allow specifying a list of files to compare, rather than
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## doing the whole tree? (Not urgent.)
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## TODO: Allow diffing any two inventories, not just the
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## current one against one. We mgiht need to specify two
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## stores to look for the files if diffing two branches. That
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## might imply this shouldn't be primarily a Branch method.
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## XXX: This doesn't report on unknown files; that can be done
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## from a separate method.
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old_it = old_tree.list_files()
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new_it = new_tree.list_files()
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def next(it):
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try:
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return it.next()
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except StopIteration:
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return None
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old_item = next(old_it)
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new_item = next(new_it)
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# We step through the two sorted iterators in parallel, trying to
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# keep them lined up.
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while (old_item != None) or (new_item != None):
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# OK, we still have some remaining on both, but they may be
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# out of step.
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if old_item != None:
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old_name, old_class, old_kind, old_id = old_item
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else:
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old_name = None
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if new_item != None:
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new_name, new_class, new_kind, new_id = new_item
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else:
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new_name = None
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mutter(" diff pairwise %r" % (old_item,))
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mutter(" %r" % (new_item,))
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if old_item:
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# can't handle the old tree being a WorkingTree
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assert old_class == 'V'
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if new_item and (new_class != 'V'):
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yield new_class, None, None, new_name, new_kind
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new_item = next(new_it)
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elif (not new_item) or (old_item and (old_name < new_name)):
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mutter(" extra entry in old-tree sequence")
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if new_tree.has_id(old_id):
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# will be mentioned as renamed under new name
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pass
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else:
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yield 'D', old_id, old_name, None, old_kind
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old_item = next(old_it)
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elif (not old_item) or (new_item and (new_name < old_name)):
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mutter(" extra entry in new-tree sequence")
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if old_tree.has_id(new_id):
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yield 'R', new_id, old_tree.id2path(new_id), new_name, new_kind
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else:
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yield 'A', new_id, None, new_name, new_kind
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new_item = next(new_it)
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elif old_id != new_id:
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assert old_name == new_name
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# both trees have a file of this name, but it is not the
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# same file. in other words, the old filename has been
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# overwritten by either a newly-added or a renamed file.
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# (should we return something about the overwritten file?)
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if old_tree.has_id(new_id):
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# renaming, overlying a deleted file
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yield 'R', new_id, old_tree.id2path(new_id), new_name, new_kind
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else:
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yield 'A', new_id, None, new_name, new_kind
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new_item = next(new_it)
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old_item = next(old_it)
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else:
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assert old_id == new_id
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assert old_id != None
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assert old_name == new_name
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assert old_kind == new_kind
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if old_kind == 'directory':
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yield '.', new_id, old_name, new_name, new_kind
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elif old_tree.get_file_size(old_id) != new_tree.get_file_size(old_id):
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mutter(" file size has changed, must be different")
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yield 'M', new_id, old_name, new_name, new_kind
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elif old_tree.get_file_sha1(old_id) == new_tree.get_file_sha1(old_id):
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mutter(" SHA1 indicates they're identical")
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## assert compare_files(old_tree.get_file(i), new_tree.get_file(i))
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yield '.', new_id, old_name, new_name, new_kind
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else:
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mutter(" quick compare shows different")
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yield 'M', new_id, old_name, new_name, new_kind
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new_item = next(new_it)
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old_item = next(old_it)
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def show_diff(b, revision, file_list):
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import difflib, sys
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import sys
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if revision == None:
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old_tree = b.basis_tree()
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else:
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new_tree = b.working_tree()
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show_diff_trees(old_tree, new_tree, sys.stdout, specific_files,
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external_diff_options)
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def show_diff_trees(old_tree, new_tree, to_file, specific_files=None,
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external_diff_options=None):
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"""Show in text form the changes from one tree to another.
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to_files
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If set, include only changes to these files.
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external_diff_options
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If set, use an external GNU diff and pass these options.
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"""
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# TODO: Options to control putting on a prefix or suffix, perhaps as a format string
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old_label = ''
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new_label = ''
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# TODO: Generation of pseudo-diffs for added/deleted files could
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# be usefully made into a much faster special case.
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# TODO: Better to return them in sorted order I think.
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if file_list:
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file_list = [b.relpath(f) for f in file_list]
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# FIXME: If given a file list, compare only those files rather
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# than comparing everything and then throwing stuff away.
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for file_state, fid, old_name, new_name, kind in diff_trees(old_tree, new_tree):
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if file_list and (new_name not in file_list):
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continue
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# Don't show this by default; maybe do it if an option is passed
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# idlabel = ' {%s}' % fid
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idlabel = ''
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# FIXME: Something about the diff format makes patch unhappy
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# with newly-added files.
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def diffit(oldlines, newlines, **kw):
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# FIXME: difflib is wrong if there is no trailing newline.
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# The syntax used by patch seems to be "\ No newline at
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# end of file" following the last diff line from that
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# file. This is not trivial to insert into the
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# unified_diff output and it might be better to just fix
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# or replace that function.
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# In the meantime we at least make sure the patch isn't
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# mangled.
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# Special workaround for Python2.3, where difflib fails if
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# both sequences are empty.
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if not oldlines and not newlines:
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return
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nonl = False
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if oldlines and (oldlines[-1][-1] != '\n'):
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oldlines[-1] += '\n'
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nonl = True
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if newlines and (newlines[-1][-1] != '\n'):
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newlines[-1] += '\n'
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nonl = True
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ud = difflib.unified_diff(oldlines, newlines, **kw)
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sys.stdout.writelines(ud)
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if nonl:
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print "\\ No newline at end of file"
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sys.stdout.write('\n')
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if file_state in ['.', '?', 'I']:
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continue
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elif file_state == 'A':
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print '*** added %s %r' % (kind, new_name)
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if kind == 'file':
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diffit([],
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new_tree.get_file(fid).readlines(),
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fromfile=DEVNULL,
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tofile=new_label + new_name + idlabel)
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elif file_state == 'D':
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assert isinstance(old_name, types.StringTypes)
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print '*** deleted %s %r' % (kind, old_name)
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if kind == 'file':
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diffit(old_tree.get_file(fid).readlines(), [],
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fromfile=old_label + old_name + idlabel,
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tofile=DEVNULL)
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elif file_state in ['M', 'R']:
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if file_state == 'M':
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assert kind == 'file'
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assert old_name == new_name
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print '*** modified %s %r' % (kind, new_name)
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elif file_state == 'R':
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print '*** renamed %s %r => %r' % (kind, old_name, new_name)
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if kind == 'file':
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diffit(old_tree.get_file(fid).readlines(),
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new_tree.get_file(fid).readlines(),
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fromfile=old_label + old_name + idlabel,
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tofile=new_label + new_name)
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if external_diff_options:
200
assert isinstance(external_diff_options, basestring)
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opts = external_diff_options.split()
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def diff_file(olab, olines, nlab, nlines, to_file):
203
external_diff(olab, olines, nlab, nlines, to_file, opts)
204
else:
205
diff_file = internal_diff
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207
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delta = compare_trees(old_tree, new_tree, want_unchanged=False,
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specific_files=specific_files)
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for path, file_id, kind in delta.removed:
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print >>to_file, '*** removed %s %r' % (kind, path)
213
if kind == 'file':
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diff_file(old_label + path,
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old_tree.get_file(file_id).readlines(),
216
DEVNULL,
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[],
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to_file)
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for path, file_id, kind in delta.added:
221
print >>to_file, '*** added %s %r' % (kind, path)
222
if kind == 'file':
223
diff_file(DEVNULL,
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[],
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new_label + path,
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new_tree.get_file(file_id).readlines(),
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to_file)
228
229
for old_path, new_path, file_id, kind, text_modified in delta.renamed:
230
print >>to_file, '*** renamed %s %r => %r' % (kind, old_path, new_path)
231
if text_modified:
232
diff_file(old_label + old_path,
233
old_tree.get_file(file_id).readlines(),
234
new_label + new_path,
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new_tree.get_file(file_id).readlines(),
236
to_file)
237
238
for path, file_id, kind in delta.modified:
239
print >>to_file, '*** modified %s %r' % (kind, path)
240
if kind == 'file':
241
diff_file(old_label + path,
242
old_tree.get_file(file_id).readlines(),
243
new_label + path,
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new_tree.get_file(file_id).readlines(),
245
to_file)
246
247
248
249
class TreeDelta(object):
250
"""Describes changes from one tree to another.
251
252
Contains four lists:
253
254
added
255
(path, id, kind)
256
removed
257
(path, id, kind)
258
renamed
259
(oldpath, newpath, id, kind, text_modified)
260
modified
261
(path, id, kind)
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unchanged
263
(path, id, kind)
264
265
Each id is listed only once.
266
267
Files that are both modified and renamed are listed only in
268
renamed, with the text_modified flag true.
269
270
The lists are normally sorted when the delta is created.
271
"""
272
def __init__(self):
273
self.added = []
274
self.removed = []
275
self.renamed = []
276
self.modified = []
277
self.unchanged = []
278
279
def __repr__(self):
280
return "TreeDelta(added=%r, removed=%r, renamed=%r, modified=%r," \
281
" unchanged=%r)" % (self.added, self.removed, self.renamed,
282
self.modified, self.unchanged)
283
284
def has_changed(self):
285
changes = len(self.added) + len(self.removed) + len(self.renamed)
286
changes += len(self.modified)
287
return (changes != 0)
288
289
def touches_file_id(self, file_id):
290
"""Return True if file_id is modified by this delta."""
291
for l in self.added, self.removed, self.modified:
292
for v in l:
293
if v[1] == file_id:
294
return True
295
for v in self.renamed:
296
if v[2] == file_id:
297
return True
298
return False
299
300
301
def show(self, to_file, show_ids=False, show_unchanged=False):
302
def show_list(files):
303
for path, fid, kind in files:
304
if kind == 'directory':
305
path += '/'
306
elif kind == 'symlink':
307
path += '@'
308
309
if show_ids:
310
print >>to_file, ' %-30s %s' % (path, fid)
311
else:
312
print >>to_file, ' ', path
313
314
if self.removed:
315
print >>to_file, 'removed:'
316
show_list(self.removed)
317
318
if self.added:
319
print >>to_file, 'added:'
320
show_list(self.added)
321
322
if self.renamed:
323
print >>to_file, 'renamed:'
324
for oldpath, newpath, fid, kind, text_modified in self.renamed:
325
if show_ids:
326
print >>to_file, ' %s => %s %s' % (oldpath, newpath, fid)
327
else:
328
print >>to_file, ' %s => %s' % (oldpath, newpath)
329
330
if self.modified:
331
print >>to_file, 'modified:'
332
show_list(self.modified)
333
334
if show_unchanged and self.unchanged:
335
print >>to_file, 'unchanged:'
336
show_list(self.unchanged)
337
338
339
340
def compare_trees(old_tree, new_tree, want_unchanged, specific_files=None):
341
"""Describe changes from one tree to another.
342
343
Returns a TreeDelta with details of added, modified, renamed, and
344
deleted entries.
345
346
The root entry is specifically exempt.
347
348
This only considers versioned files.
349
350
want_unchanged
351
If true, also list files unchanged from one version to
352
the next.
353
354
specific_files
355
If true, only check for changes to specified names or
356
files within them.
357
"""
358
359
from osutils import is_inside_any
360
361
old_inv = old_tree.inventory
362
new_inv = new_tree.inventory
363
delta = TreeDelta()
364
mutter('start compare_trees')
365
366
# TODO: match for specific files can be rather smarter by finding
367
# the IDs of those files up front and then considering only that.
368
369
for file_id in old_tree:
370
if file_id in new_tree:
371
kind = old_inv.get_file_kind(file_id)
372
assert kind == new_inv.get_file_kind(file_id)
373
374
assert kind in ('file', 'directory', 'symlink', 'root_directory'), \
375
'invalid file kind %r' % kind
376
377
if kind == 'root_directory':
378
continue
379
380
old_path = old_inv.id2path(file_id)
381
new_path = new_inv.id2path(file_id)
382
383
if specific_files:
384
if (not is_inside_any(specific_files, old_path)
385
and not is_inside_any(specific_files, new_path)):
386
continue
387
388
if kind == 'file':
389
old_sha1 = old_tree.get_file_sha1(file_id)
390
new_sha1 = new_tree.get_file_sha1(file_id)
391
text_modified = (old_sha1 != new_sha1)
392
else:
393
## mutter("no text to check for %r %r" % (file_id, kind))
394
text_modified = False
395
396
# TODO: Can possibly avoid calculating path strings if the
397
# two files are unchanged and their names and parents are
398
# the same and the parents are unchanged all the way up.
399
# May not be worthwhile.
400
401
if old_path != new_path:
402
delta.renamed.append((old_path, new_path, file_id, kind,
403
text_modified))
404
elif text_modified:
405
delta.modified.append((new_path, file_id, kind))
406
elif want_unchanged:
407
delta.unchanged.append((new_path, file_id, kind))
247
408
else:
248
bailout("can't represent state %s {%s}" % (file_state, fid))
249
250
409
kind = old_inv.get_file_kind(file_id)
410
old_path = old_inv.id2path(file_id)
411
if specific_files:
412
if not is_inside_any(specific_files, old_path):
413
continue
414
delta.removed.append((old_path, file_id, kind))
415
416
mutter('start looking for new files')
417
for file_id in new_inv:
418
if file_id in old_inv:
419
continue
420
new_path = new_inv.id2path(file_id)
421
if specific_files:
422
if not is_inside_any(specific_files, new_path):
423
continue
424
kind = new_inv.get_file_kind(file_id)
425
delta.added.append((new_path, file_id, kind))
426
427
delta.removed.sort()
428
delta.added.sort()
429
delta.renamed.sort()
430
delta.modified.sort()
431
delta.unchanged.sort()
432
433
return delta
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