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- Committer: Martin Pool
- Date: 2005-05-30 03:05:03 UTC
- Revision ID: mbp@sourcefrog.net-20050530030503-8fd9959e40c31eeb
todo
- files added:
- TODO
- contrib
- contrib/bash
- contrib/zsh
- patches
- files removed:
- bzrlib/tests.py
- 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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"""
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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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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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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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old_tree = b.revision_tree(b.lookup_revision(revision))
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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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DEVNULL = '/dev/null'
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# Windows users, don't panic about this filename -- it is a
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# special signal to GNU patch that the file should be created or
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# deleted respectively.
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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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if external_diff_options:
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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):
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external_diff(olab, olines, nlab, nlines, to_file, opts)
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else:
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diff_file = internal_diff
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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 '*** removed %s %r' % (kind, path)
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if kind == 'file':
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diff_file(old_label + path,
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old_tree.get_file(file_id).readlines(),
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DEVNULL,
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[],
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to_file)
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for path, file_id, kind in delta.added:
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print '*** added %s %r' % (kind, path)
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if kind == 'file':
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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)
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for old_path, new_path, file_id, kind, text_modified in delta.renamed:
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print '*** renamed %s %r => %r' % (kind, old_path, new_path)
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if text_modified:
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diff_file(old_label + old_path,
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old_tree.get_file(file_id).readlines(),
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new_label + new_path,
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new_tree.get_file(file_id).readlines(),
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to_file)
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for path, file_id, kind in delta.modified:
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print '*** modified %s %r' % (kind, path)
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if kind == 'file':
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diff_file(old_label + path,
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old_tree.get_file(file_id).readlines(),
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new_label + path,
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new_tree.get_file(file_id).readlines(),
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to_file)
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class TreeDelta(object):
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"""Describes changes from one tree to another.
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Contains four lists:
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added
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(path, id, kind)
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removed
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(path, id, kind)
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renamed
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(oldpath, newpath, id, kind, text_modified)
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modified
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(path, id, kind)
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unchanged
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(path, id, kind)
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Each id is listed only once.
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Files that are both modified and renamed are listed only in
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renamed, with the text_modified flag true.
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The lists are normally sorted when the delta is created.
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"""
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def __init__(self):
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self.added = []
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self.removed = []
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self.renamed = []
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self.modified = []
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self.unchanged = []
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def touches_file_id(self, file_id):
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"""Return True if file_id is modified by this delta."""
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for l in self.added, self.removed, self.modified:
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for v in l:
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if v[1] == file_id:
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return True
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for v in self.renamed:
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if v[2] == file_id:
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return True
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return False
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def show(self, to_file, show_ids=False, show_unchanged=False):
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def show_list(files):
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for path, fid, kind in files:
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if kind == 'directory':
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path += '/'
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elif kind == 'symlink':
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path += '@'
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if show_ids:
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print >>to_file, ' %-30s %s' % (path, fid)
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else:
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print >>to_file, ' ', path
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if self.removed:
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print >>to_file, 'removed:'
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show_list(self.removed)
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if self.added:
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print >>to_file, 'added:'
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show_list(self.added)
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if self.renamed:
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print >>to_file, 'renamed:'
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for oldpath, newpath, fid, kind, text_modified in self.renamed:
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if show_ids:
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print >>to_file, ' %s => %s %s' % (oldpath, newpath, fid)
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else:
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print >>to_file, ' %s => %s' % (oldpath, newpath)
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if self.modified:
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print >>to_file, 'modified:'
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show_list(self.modified)
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if show_unchanged and self.unchanged:
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print >>to_file, 'unchanged:'
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show_list(self.unchanged)
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def compare_trees(old_tree, new_tree, want_unchanged, specific_files=None):
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"""Describe changes from one tree to another.
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Returns a TreeDelta with details of added, modified, renamed, and
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deleted entries.
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The root entry is specifically exempt.
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This only considers versioned files.
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want_unchanged
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If true, also list files unchanged from one version to
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the next.
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specific_files
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If true, only check for changes to specified names or
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files within them.
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"""
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from osutils import is_inside_any
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old_inv = old_tree.inventory
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new_inv = new_tree.inventory
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delta = TreeDelta()
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mutter('start compare_trees')
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# TODO: match for specific files can be rather smarter by finding
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# the IDs of those files up front and then considering only that.
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for file_id in old_tree:
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if file_id in new_tree:
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kind = old_inv.get_file_kind(file_id)
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assert kind == new_inv.get_file_kind(file_id)
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assert kind in ('file', 'directory', 'symlink', 'root_directory'), \
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'invalid file kind %r' % kind
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if kind == 'root_directory':
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continue
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old_path = old_inv.id2path(file_id)
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new_path = new_inv.id2path(file_id)
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if specific_files:
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if (not is_inside_any(specific_files, old_path)
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and not is_inside_any(specific_files, new_path)):
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continue
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if kind == 'file':
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old_sha1 = old_tree.get_file_sha1(file_id)
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new_sha1 = new_tree.get_file_sha1(file_id)
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text_modified = (old_sha1 != new_sha1)
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else:
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## mutter("no text to check for %r %r" % (file_id, kind))
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text_modified = False
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# TODO: Can possibly avoid calculating path strings if the
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# two files are unchanged and their names and parents are
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# the same and the parents are unchanged all the way up.
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# May not be worthwhile.
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if old_path != new_path:
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delta.renamed.append((old_path, new_path, file_id, kind,
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text_modified))
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elif text_modified:
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delta.modified.append((new_path, file_id, kind))
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elif want_unchanged:
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delta.unchanged.append((new_path, file_id, kind))
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else:
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kind = old_inv.get_file_kind(file_id)
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old_path = old_inv.id2path(file_id)
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if specific_files:
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if not is_inside_any(specific_files, old_path):
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continue
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delta.removed.append((old_path, file_id, kind))
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mutter('start looking for new files')
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for file_id in new_inv:
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if file_id in old_inv:
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continue
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new_path = new_inv.id2path(file_id)
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if specific_files:
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if not is_inside_any(specific_files, new_path):
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continue
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kind = new_inv.get_file_kind(file_id)
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delta.added.append((new_path, file_id, kind))
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delta.removed.sort()
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delta.added.sort()
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delta.renamed.sort()
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delta.modified.sort()
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delta.unchanged.sort()
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return delta
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