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|
# -*- coding: utf-8 -*-
"""
rhodecode.lib.diffs
~~~~~~~~~~~~~~~~~~~
Set of diffing helpers, previously part of vcs
:created_on: Dec 4, 2011
:author: marcink
:copyright: (C) 2010-2012 Marcin Kuzminski <marcin@python-works.com>
:original copyright: 2007-2008 by Armin Ronacher
:license: GPLv3, see COPYING for more details.
"""
# 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 3 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, see <http://www.gnu.org/licenses/>.
import re
import difflib
import logging
import traceback
from itertools import tee, imap
from mercurial import patch
from mercurial.mdiff import diffopts
from mercurial.bundlerepo import bundlerepository
from pylons.i18n.translation import _
from rhodecode.lib.compat import BytesIO
from rhodecode.lib.vcs.utils.hgcompat import localrepo
from rhodecode.lib.vcs.exceptions import VCSError
from rhodecode.lib.vcs.nodes import FileNode, SubModuleNode
from rhodecode.lib.vcs.backends.base import EmptyChangeset
from rhodecode.lib.helpers import escape
from rhodecode.lib.utils import make_ui
from rhodecode.lib.utils2 import safe_unicode
log = logging.getLogger(__name__)
def wrap_to_table(str_):
return '''<table class="code-difftable">
<tr class="line no-comment">
<td class="lineno new"></td>
<td class="code no-comment"><pre>%s</pre></td>
</tr>
</table>''' % str_
def wrapped_diff(filenode_old, filenode_new, cut_off_limit=None,
ignore_whitespace=True, line_context=3,
enable_comments=False):
"""
returns a wrapped diff into a table, checks for cut_off_limit and presents
proper message
"""
if filenode_old is None:
filenode_old = FileNode(filenode_new.path, '', EmptyChangeset())
if filenode_old.is_binary or filenode_new.is_binary:
diff = wrap_to_table(_('binary file'))
stats = (0, 0)
size = 0
elif cut_off_limit != -1 and (cut_off_limit is None or
(filenode_old.size < cut_off_limit and filenode_new.size < cut_off_limit)):
f_gitdiff = get_gitdiff(filenode_old, filenode_new,
ignore_whitespace=ignore_whitespace,
context=line_context)
diff_processor = DiffProcessor(f_gitdiff, format='gitdiff')
diff = diff_processor.as_html(enable_comments=enable_comments)
stats = diff_processor.stat()
size = len(diff or '')
else:
diff = wrap_to_table(_('Changeset was too big and was cut off, use '
'diff menu to display this diff'))
stats = (0, 0)
size = 0
if not diff:
submodules = filter(lambda o: isinstance(o, SubModuleNode),
[filenode_new, filenode_old])
if submodules:
diff = wrap_to_table(escape('Submodule %r' % submodules[0]))
else:
diff = wrap_to_table(_('No changes detected'))
cs1 = filenode_old.changeset.raw_id
cs2 = filenode_new.changeset.raw_id
return size, cs1, cs2, diff, stats
def get_gitdiff(filenode_old, filenode_new, ignore_whitespace=True, context=3):
"""
Returns git style diff between given ``filenode_old`` and ``filenode_new``.
:param ignore_whitespace: ignore whitespaces in diff
"""
# make sure we pass in default context
context = context or 3
submodules = filter(lambda o: isinstance(o, SubModuleNode),
[filenode_new, filenode_old])
if submodules:
return ''
for filenode in (filenode_old, filenode_new):
if not isinstance(filenode, FileNode):
raise VCSError("Given object should be FileNode object, not %s"
% filenode.__class__)
repo = filenode_new.changeset.repository
old_raw_id = getattr(filenode_old.changeset, 'raw_id', repo.EMPTY_CHANGESET)
new_raw_id = getattr(filenode_new.changeset, 'raw_id', repo.EMPTY_CHANGESET)
vcs_gitdiff = repo.get_diff(old_raw_id, new_raw_id, filenode_new.path,
ignore_whitespace, context)
return vcs_gitdiff
NEW_FILENODE = 1
DEL_FILENODE = 2
MOD_FILENODE = 3
RENAMED_FILENODE = 4
CHMOD_FILENODE = 5
class DiffLimitExceeded(Exception):
pass
class LimitedDiffContainer(object):
def __init__(self, diff_limit, cur_diff_size, diff):
self.diff = diff
self.diff_limit = diff_limit
self.cur_diff_size = cur_diff_size
def __iter__(self):
for l in self.diff:
yield l
class DiffProcessor(object):
"""
Give it a unified or git diff and it returns a list of the files that were
mentioned in the diff together with a dict of meta information that
can be used to render it in a HTML template.
"""
_chunk_re = re.compile(r'^@@ -(\d+)(?:,(\d+))? \+(\d+)(?:,(\d+))? @@(.*)')
_newline_marker = re.compile(r'^\\ No newline at end of file')
_git_header_re = re.compile(r"""
#^diff[ ]--git
[ ]a/(?P<a_path>.+?)[ ]b/(?P<b_path>.+?)\n
(?:^similarity[ ]index[ ](?P<similarity_index>\d+)%\n
^rename[ ]from[ ](?P<rename_from>\S+)\n
^rename[ ]to[ ](?P<rename_to>\S+)(?:\n|$))?
(?:^old[ ]mode[ ](?P<old_mode>\d+)\n
^new[ ]mode[ ](?P<new_mode>\d+)(?:\n|$))?
(?:^new[ ]file[ ]mode[ ](?P<new_file_mode>.+)(?:\n|$))?
(?:^deleted[ ]file[ ]mode[ ](?P<deleted_file_mode>.+)(?:\n|$))?
(?:^index[ ](?P<a_blob_id>[0-9A-Fa-f]+)
\.\.(?P<b_blob_id>[0-9A-Fa-f]+)[ ]?(?P<b_mode>.+)?(?:\n|$))?
(?:^---[ ](a/(?P<a_file>.+)|/dev/null)(?:\n|$))?
(?:^\+\+\+[ ](b/(?P<b_file>.+)|/dev/null)(?:\n|$))?
""", re.VERBOSE | re.MULTILINE)
_hg_header_re = re.compile(r"""
#^diff[ ]--git
[ ]a/(?P<a_path>.+?)[ ]b/(?P<b_path>.+?)\n
(?:^similarity[ ]index[ ](?P<similarity_index>\d+)%(?:\n|$))?
(?:^rename[ ]from[ ](?P<rename_from>\S+)\n
^rename[ ]to[ ](?P<rename_to>\S+)(?:\n|$))?
(?:^old[ ]mode[ ](?P<old_mode>\d+)\n
^new[ ]mode[ ](?P<new_mode>\d+)(?:\n|$))?
(?:^new[ ]file[ ]mode[ ](?P<new_file_mode>.+)(?:\n|$))?
(?:^deleted[ ]file[ ]mode[ ](?P<deleted_file_mode>.+)(?:\n|$))?
(?:^index[ ](?P<a_blob_id>[0-9A-Fa-f]+)
\.\.(?P<b_blob_id>[0-9A-Fa-f]+)[ ]?(?P<b_mode>.+)?(?:\n|$))?
(?:^---[ ](a/(?P<a_file>.+)|/dev/null)(?:\n|$))?
(?:^\+\+\+[ ](b/(?P<b_file>.+)|/dev/null)(?:\n|$))?
""", re.VERBOSE | re.MULTILINE)
#used for inline highlighter word split
_token_re = re.compile(r'()(>|<|&|\W+?)')
def __init__(self, diff, vcs='hg', format='gitdiff', diff_limit=None):
"""
:param diff: a text in diff format
:param vcs: type of version controll hg or git
:param format: format of diff passed, `udiff` or `gitdiff`
:param diff_limit: define the size of diff that is considered "big"
based on that parameter cut off will be triggered, set to None
to show full diff
"""
if not isinstance(diff, basestring):
raise Exception('Diff must be a basestring got %s instead' % type(diff))
self._diff = diff
self._format = format
self.adds = 0
self.removes = 0
# calculate diff size
self.diff_size = len(diff)
self.diff_limit = diff_limit
self.cur_diff_size = 0
self.parsed = False
self.parsed_diff = []
self.vcs = vcs
if format == 'gitdiff':
self.differ = self._highlight_line_difflib
self._parser = self._parse_gitdiff
else:
self.differ = self._highlight_line_udiff
self._parser = self._parse_udiff
def _copy_iterator(self):
"""
make a fresh copy of generator, we should not iterate thru
an original as it's needed for repeating operations on
this instance of DiffProcessor
"""
self.__udiff, iterator_copy = tee(self.__udiff)
return iterator_copy
def _escaper(self, string):
"""
Escaper for diff escapes special chars and checks the diff limit
:param string:
:type string:
"""
self.cur_diff_size += len(string)
# escaper get's iterated on each .next() call and it checks if each
# parsed line doesn't exceed the diff limit
if self.diff_limit is not None and self.cur_diff_size > self.diff_limit:
raise DiffLimitExceeded('Diff Limit Exceeded')
return safe_unicode(string).replace('&', '&')\
.replace('<', '<')\
.replace('>', '>')
def _line_counter(self, l):
"""
Checks each line and bumps total adds/removes for this diff
:param l:
"""
if l.startswith('+') and not l.startswith('+++'):
self.adds += 1
elif l.startswith('-') and not l.startswith('---'):
self.removes += 1
return safe_unicode(l)
def _highlight_line_difflib(self, line, next_):
"""
Highlight inline changes in both lines.
"""
if line['action'] == 'del':
old, new = line, next_
else:
old, new = next_, line
oldwords = self._token_re.split(old['line'])
newwords = self._token_re.split(new['line'])
sequence = difflib.SequenceMatcher(None, oldwords, newwords)
oldfragments, newfragments = [], []
for tag, i1, i2, j1, j2 in sequence.get_opcodes():
oldfrag = ''.join(oldwords[i1:i2])
newfrag = ''.join(newwords[j1:j2])
if tag != 'equal':
if oldfrag:
oldfrag = '<del>%s</del>' % oldfrag
if newfrag:
newfrag = '<ins>%s</ins>' % newfrag
oldfragments.append(oldfrag)
newfragments.append(newfrag)
old['line'] = "".join(oldfragments)
new['line'] = "".join(newfragments)
def _highlight_line_udiff(self, line, next_):
"""
Highlight inline changes in both lines.
"""
start = 0
limit = min(len(line['line']), len(next_['line']))
while start < limit and line['line'][start] == next_['line'][start]:
start += 1
end = -1
limit -= start
while -end <= limit and line['line'][end] == next_['line'][end]:
end -= 1
end += 1
if start or end:
def do(l):
last = end + len(l['line'])
if l['action'] == 'add':
tag = 'ins'
else:
tag = 'del'
l['line'] = '%s<%s>%s</%s>%s' % (
l['line'][:start],
tag,
l['line'][start:last],
tag,
l['line'][last:]
)
do(line)
do(next_)
def _get_header(self, diff_chunk):
"""
parses the diff header, and returns parts, and leftover diff
parts consists of 14 elements::
a_path, b_path, similarity_index, rename_from, rename_to,
old_mode, new_mode, new_file_mode, deleted_file_mode,
a_blob_id, b_blob_id, b_mode, a_file, b_file
:param diff_chunk:
:type diff_chunk:
"""
if self.vcs == 'git':
match = self._git_header_re.match(diff_chunk)
diff = diff_chunk[match.end():]
return match.groupdict(), imap(self._escaper, diff.splitlines(1))
elif self.vcs == 'hg':
match = self._hg_header_re.match(diff_chunk)
diff = diff_chunk[match.end():]
return match.groupdict(), imap(self._escaper, diff.splitlines(1))
else:
raise Exception('VCS type %s is not supported' % self.vcs)
def _clean_line(self, line, command):
if command in ['+', '-', ' ']:
#only modify the line if it's actually a diff thing
line = line[1:]
return line
def _parse_gitdiff(self, inline_diff=True):
_files = []
diff_container = lambda arg: arg
##split the diff in chunks of separate --git a/file b/file chunks
for raw_diff in ('\n' + self._diff).split('\ndiff --git')[1:]:
binary = False
binary_msg = 'unknown binary'
head, diff = self._get_header(raw_diff)
if not head['a_file'] and head['b_file']:
op = 'A'
elif head['a_file'] and head['b_file']:
op = 'M'
elif head['a_file'] and not head['b_file']:
op = 'D'
else:
#probably we're dealing with a binary file 1
binary = True
if head['deleted_file_mode']:
op = 'D'
stats = ['b', DEL_FILENODE]
binary_msg = 'deleted binary file'
elif head['new_file_mode']:
op = 'A'
stats = ['b', NEW_FILENODE]
binary_msg = 'new binary file %s' % head['new_file_mode']
else:
if head['new_mode'] and head['old_mode']:
stats = ['b', CHMOD_FILENODE]
op = 'M'
binary_msg = ('modified binary file chmod %s => %s'
% (head['old_mode'], head['new_mode']))
elif (head['rename_from'] and head['rename_to']
and head['rename_from'] != head['rename_to']):
stats = ['b', RENAMED_FILENODE]
op = 'M'
binary_msg = ('file renamed from %s to %s'
% (head['rename_from'], head['rename_to']))
else:
stats = ['b', MOD_FILENODE]
op = 'M'
binary_msg = 'modified binary file'
if not binary:
try:
chunks, stats = self._parse_lines(diff)
except DiffLimitExceeded:
diff_container = lambda _diff: LimitedDiffContainer(
self.diff_limit,
self.cur_diff_size,
_diff)
break
else:
chunks = []
chunks.append([{
'old_lineno': '',
'new_lineno': '',
'action': 'binary',
'line': binary_msg,
}])
_files.append({
'filename': head['b_path'],
'old_revision': head['a_blob_id'],
'new_revision': head['b_blob_id'],
'chunks': chunks,
'operation': op,
'stats': stats,
})
sorter = lambda info: {'A': 0, 'M': 1, 'D': 2}.get(info['operation'])
if inline_diff is False:
return diff_container(sorted(_files, key=sorter))
# highlight inline changes
for diff_data in _files:
for chunk in diff_data['chunks']:
lineiter = iter(chunk)
try:
while 1:
line = lineiter.next()
if line['action'] not in ['unmod', 'context']:
nextline = lineiter.next()
if nextline['action'] in ['unmod', 'context'] or \
nextline['action'] == line['action']:
continue
self.differ(line, nextline)
except StopIteration:
pass
return diff_container(sorted(_files, key=sorter))
def _parse_udiff(self, inline_diff=True):
raise NotImplementedError()
def _parse_lines(self, diff):
"""
Parse the diff an return data for the template.
"""
lineiter = iter(diff)
stats = [0, 0]
try:
chunks = []
line = lineiter.next()
while line:
lines = []
chunks.append(lines)
match = self._chunk_re.match(line)
if not match:
break
gr = match.groups()
(old_line, old_end,
new_line, new_end) = [int(x or 1) for x in gr[:-1]]
old_line -= 1
new_line -= 1
context = len(gr) == 5
old_end += old_line
new_end += new_line
if context:
# skip context only if it's first line
if int(gr[0]) > 1:
lines.append({
'old_lineno': '...',
'new_lineno': '...',
'action': 'context',
'line': line,
})
line = lineiter.next()
while old_line < old_end or new_line < new_end:
command = ' '
if line:
command = line[0]
affects_old = affects_new = False
# ignore those if we don't expect them
if command in '#@':
continue
elif command == '+':
affects_new = True
action = 'add'
stats[0] += 1
elif command == '-':
affects_old = True
action = 'del'
stats[1] += 1
else:
affects_old = affects_new = True
action = 'unmod'
if not self._newline_marker.match(line):
old_line += affects_old
new_line += affects_new
lines.append({
'old_lineno': affects_old and old_line or '',
'new_lineno': affects_new and new_line or '',
'action': action,
'line': self._clean_line(line, command)
})
line = lineiter.next()
if self._newline_marker.match(line):
# we need to append to lines, since this is not
# counted in the line specs of diff
lines.append({
'old_lineno': '...',
'new_lineno': '...',
'action': 'context',
'line': self._clean_line(line, command)
})
except StopIteration:
pass
return chunks, stats
def _safe_id(self, idstring):
"""Make a string safe for including in an id attribute.
The HTML spec says that id attributes 'must begin with
a letter ([A-Za-z]) and may be followed by any number
of letters, digits ([0-9]), hyphens ("-"), underscores
("_"), colons (":"), and periods (".")'. These regexps
are slightly over-zealous, in that they remove colons
and periods unnecessarily.
Whitespace is transformed into underscores, and then
anything which is not a hyphen or a character that
matches \w (alphanumerics and underscore) is removed.
"""
# Transform all whitespace to underscore
idstring = re.sub(r'\s', "_", '%s' % idstring)
# Remove everything that is not a hyphen or a member of \w
idstring = re.sub(r'(?!-)\W', "", idstring).lower()
return idstring
def prepare(self, inline_diff=True):
"""
Prepare the passed udiff for HTML rendering. It'l return a list
of dicts with diff information
"""
parsed = self._parser(inline_diff=inline_diff)
self.parsed = True
self.parsed_diff = parsed
return parsed
def as_raw(self, diff_lines=None):
"""
Returns raw string diff
"""
return self._diff
#return u''.join(imap(self._line_counter, self._diff.splitlines(1)))
def as_html(self, table_class='code-difftable', line_class='line',
old_lineno_class='lineno old', new_lineno_class='lineno new',
code_class='code', enable_comments=False, parsed_lines=None):
"""
Return given diff as html table with customized css classes
"""
def _link_to_if(condition, label, url):
"""
Generates a link if condition is meet or just the label if not.
"""
if condition:
return '''<a href="%(url)s">%(label)s</a>''' % {
'url': url,
'label': label
}
else:
return label
if not self.parsed:
self.prepare()
diff_lines = self.parsed_diff
if parsed_lines:
diff_lines = parsed_lines
_html_empty = True
_html = []
_html.append('''<table class="%(table_class)s">\n''' % {
'table_class': table_class
})
for diff in diff_lines:
for line in diff['chunks']:
_html_empty = False
for change in line:
_html.append('''<tr class="%(lc)s %(action)s">\n''' % {
'lc': line_class,
'action': change['action']
})
anchor_old_id = ''
anchor_new_id = ''
anchor_old = "%(filename)s_o%(oldline_no)s" % {
'filename': self._safe_id(diff['filename']),
'oldline_no': change['old_lineno']
}
anchor_new = "%(filename)s_n%(oldline_no)s" % {
'filename': self._safe_id(diff['filename']),
'oldline_no': change['new_lineno']
}
cond_old = (change['old_lineno'] != '...' and
change['old_lineno'])
cond_new = (change['new_lineno'] != '...' and
change['new_lineno'])
if cond_old:
anchor_old_id = 'id="%s"' % anchor_old
if cond_new:
anchor_new_id = 'id="%s"' % anchor_new
###########################################################
# OLD LINE NUMBER
###########################################################
_html.append('''\t<td %(a_id)s class="%(olc)s">''' % {
'a_id': anchor_old_id,
'olc': old_lineno_class
})
_html.append('''%(link)s''' % {
'link': _link_to_if(True, change['old_lineno'],
'#%s' % anchor_old)
})
_html.append('''</td>\n''')
###########################################################
# NEW LINE NUMBER
###########################################################
_html.append('''\t<td %(a_id)s class="%(nlc)s">''' % {
'a_id': anchor_new_id,
'nlc': new_lineno_class
})
_html.append('''%(link)s''' % {
'link': _link_to_if(True, change['new_lineno'],
'#%s' % anchor_new)
})
_html.append('''</td>\n''')
###########################################################
# CODE
###########################################################
comments = '' if enable_comments else 'no-comment'
_html.append('''\t<td class="%(cc)s %(inc)s">''' % {
'cc': code_class,
'inc': comments
})
_html.append('''\n\t\t<pre>%(code)s</pre>\n''' % {
'code': change['line']
})
_html.append('''\t</td>''')
_html.append('''\n</tr>\n''')
_html.append('''</table>''')
if _html_empty:
return None
return ''.join(_html)
def stat(self):
"""
Returns tuple of added, and removed lines for this instance
"""
return self.adds, self.removes
class InMemoryBundleRepo(bundlerepository):
def __init__(self, ui, path, bundlestream):
self._tempparent = None
localrepo.localrepository.__init__(self, ui, path)
self.ui.setconfig('phases', 'publish', False)
self.bundle = bundlestream
# dict with the mapping 'filename' -> position in the bundle
self.bundlefilespos = {}
def differ(org_repo, org_ref, other_repo, other_ref, discovery_data=None,
remote_compare=False, context=3, ignore_whitespace=False):
"""
General differ between branches, bookmarks, revisions of two remote or
local but related repositories
:param org_repo:
:param org_ref:
:param other_repo:
:type other_repo:
:type other_ref:
"""
org_repo_scm = org_repo.scm_instance
other_repo_scm = other_repo.scm_instance
org_repo = org_repo_scm._repo
other_repo = other_repo_scm._repo
org_ref = org_ref[1]
other_ref = other_ref[1]
if org_repo_scm == other_repo_scm:
log.debug('running diff between %s@%s and %s@%s'
% (org_repo.path, org_ref, other_repo.path, other_ref))
_diff = org_repo_scm.get_diff(rev1=org_ref, rev2=other_ref,
ignore_whitespace=ignore_whitespace, context=context)
return _diff
elif remote_compare:
opts = diffopts(git=True, ignorews=ignore_whitespace, context=context)
common, incoming, rheads = discovery_data
org_repo_peer = localrepo.locallegacypeer(org_repo.local())
# create a bundle (uncompressed if other repo is not local)
if org_repo_peer.capable('getbundle'):
# disable repo hooks here since it's just bundle !
# patch and reset hooks section of UI config to not run any
# hooks on fetching archives with subrepos
for k, _ in org_repo.ui.configitems('hooks'):
org_repo.ui.setconfig('hooks', k, None)
unbundle = org_repo.getbundle('incoming', common=None,
heads=None)
buf = BytesIO()
while True:
chunk = unbundle._stream.read(1024 * 4)
if not chunk:
break
buf.write(chunk)
buf.seek(0)
# replace chunked _stream with data that can do tell() and seek()
unbundle._stream = buf
ui = make_ui('db')
bundlerepo = InMemoryBundleRepo(ui, path=org_repo.root,
bundlestream=unbundle)
return ''.join(patch.diff(bundlerepo,
node1=other_repo[other_ref].node(),
node2=org_repo[org_ref].node(),
opts=opts))
return ''
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