233 lines
8.8 KiB
Python
233 lines
8.8 KiB
Python
# Copyright 2014 OpenStack Foundation
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import logging
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import difflib
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import os
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import re
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import git
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class DiffFile(object):
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def __init__(self):
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self.newname = None
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self.oldname = None
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self.oldlines = []
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self.newlines = []
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class GitCheckoutError(Exception):
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def __init__(self, msg):
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super(GitCheckoutError, self).__init__(msg)
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self.msg = msg
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class Repo(object):
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def __init__(self, url, path):
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self.log = logging.getLogger('gertty.gitrepo')
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self.url = url
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self.path = path
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self.differ = difflib.Differ()
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if not os.path.exists(path):
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git.Repo.clone_from(self.url, self.path)
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def fetch(self, url, refspec):
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repo = git.Repo(self.path)
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try:
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repo.git.fetch(url, refspec)
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except AssertionError:
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repo.git.fetch(url, refspec)
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def checkout(self, ref):
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repo = git.Repo(self.path)
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try:
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repo.git.checkout(ref)
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except git.exc.GitCommandError as e:
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raise GitCheckoutError(e.stderr.replace('\t', ' '))
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def diffstat(self, old, new):
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repo = git.Repo(self.path)
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diff = repo.git.diff('-M', '--numstat', old, new)
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ret = []
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for x in diff.split('\n'):
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# Added, removed, filename
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ret.append(x.split('\t'))
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return ret
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def intraline_diff(self, old, new):
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prevline = None
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prevstyle = None
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output_old = []
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output_new = []
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#socket.send('startold' + repr(old)+'\n')
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#socket.send('startnew' + repr(new)+'\n')
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for line in self.differ.compare(old, new):
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#socket.sendall('diff output: ' + line+'\n')
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key = line[0]
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rest = line[2:]
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if key == '?':
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result = []
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accumulator = ''
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emphasis = False
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rest = rest[:-1] # It has a newline.
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for i, c in enumerate(prevline):
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if i >= len(rest):
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indicator = ' '
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else:
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indicator = rest[i]
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#socket.sendall('%s %s %s %s %s\n' % (i, c, indicator, emphasis, accumulator))
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if indicator != ' ' and not emphasis:
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# changing from not emph to emph
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if accumulator:
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result.append((prevstyle+'-line', accumulator))
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accumulator = ''
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emphasis = True
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elif indicator == ' ' and emphasis:
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# changing from emph to not emph
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if accumulator:
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result.append((prevstyle+'-word', accumulator))
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accumulator = ''
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emphasis = False
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accumulator += c
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if accumulator:
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if emphasis:
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result.append((prevstyle+'-word', accumulator))
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else:
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result.append((prevstyle+'-line', accumulator))
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if prevstyle == 'added':
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output_new.append(result)
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elif prevstyle == 'removed':
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output_old.append(result)
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prevline = None
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continue
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if prevline is not None:
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if prevstyle == 'added':
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output_new.append((prevstyle+'-line', prevline))
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elif prevstyle == 'removed':
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output_old.append((prevstyle+'-line', prevline))
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if key == '+':
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prevstyle = 'added'
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elif key == '-':
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prevstyle = 'removed'
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prevline = rest
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#socket.sendall('prev'+repr(prevline)+'\n')
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if prevline is not None:
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if prevstyle == 'added':
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output_new.append((prevstyle+'-line', prevline))
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elif prevstyle == 'removed':
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output_old.append((prevstyle+'-line', prevline))
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#socket.sendall(repr(output_old)+'\n')
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#socket.sendall(repr(output_new)+'\n')
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#socket.sendall('\n')
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return output_old, output_new
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header_re = re.compile('@@ -(\d+)(,\d+)? \+(\d+)(,\d+)? @@')
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def diff(self, old, new, context=20):
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repo = git.Repo(self.path)
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#'-y', '-x', 'diff -C10', old, new, path).split('\n'):
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oldc = repo.commit(old)
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newc = repo.commit(new)
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files = []
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for diff_context in oldc.diff(newc, create_patch=True, U=context):
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f = DiffFile()
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files.append(f)
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if diff_context.rename_from:
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f.oldname = diff_context.rename_from
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if diff_context.rename_to:
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f.newname = diff_context.rename_to
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old_lineno = 0
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new_lineno = 0
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offset = 0
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oldchunk = []
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newchunk = []
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prev_key = ''
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diff_lines = diff_context.diff.split('\n')
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for i, line in enumerate(diff_lines):
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last_line = (i == len(diff_lines)-1)
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if line.startswith('---'):
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f.oldname = line[6:]
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if line[4:] == '/dev/null':
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f.oldname = 'Empty file'
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continue
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if line.startswith('+++'):
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f.newname = line[6:]
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if line[4:] == '/dev/null':
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f.newname = 'Empty file'
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continue
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if line.startswith('@@'):
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#socket.sendall(line)
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m = self.header_re.match(line)
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#socket.sendall(str(m.groups()))
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old_lineno = int(m.group(1))
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new_lineno = int(m.group(3))
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continue
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if not line:
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if prev_key != '\\':
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# Strangely, we get an extra newline in the
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# diff in the case that the last line is "\ No
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# newline at end of file". This is a
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# workaround for that.
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prev_key = ''
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line = 'X '
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else:
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line = ' '
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key = line[0]
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rest = line[1:]
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if key == '\\':
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# This is for "\ No newline at end of file" which
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# follows either a - or + line to indicate which
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# file it's talking about. For now, treat it like
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# normal text and let the user infer from context
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# that it's not actually in the file. Potential
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# TODO: highlight it to make that more clear.
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key = prev_key
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prev_key = '\\'
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if key == '-':
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prev_key = '-'
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oldchunk.append(rest)
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if not last_line:
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continue
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if key == '+':
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prev_key = '+'
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newchunk.append(rest)
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if not last_line:
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continue
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prev_key = ''
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# end of chunk
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if oldchunk or newchunk:
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oldchunk, newchunk = self.intraline_diff(oldchunk, newchunk)
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for l in oldchunk:
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f.oldlines.append((old_lineno, '-', l))
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old_lineno += 1
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offset -= 1
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for l in newchunk:
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f.newlines.append((new_lineno, '+', l))
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new_lineno += 1
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offset += 1
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oldchunk = []
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newchunk = []
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while offset > 0:
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f.oldlines.append((None, '', ''))
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offset -= 1
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while offset < 0:
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f.newlines.append((None, '', ''))
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offset += 1
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if key == ' ':
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f.oldlines.append((old_lineno, ' ', rest))
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f.newlines.append((new_lineno, ' ', rest))
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old_lineno += 1
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new_lineno += 1
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continue
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if not last_line:
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raise Exception("Unhandled line: %s" % line)
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return files
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