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Viewing changes to loggerhead/controllers/filediff_ui.py

  • Committer: Ian Clatworthy
  • Date: 2010-04-23 00:02:29 UTC
  • mfrom: (407.1.2 loggerhead)
  • Revision ID: ian.clatworthy@canonical.com-20100423000229-ysxj7lzkx6oklt35
https://launchpad.net/bugs/513044
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loggerhead/controllers/filediff_ui.py
 
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from StringIO import StringIO
 
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import urllib
 
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from bzrlib import diff
 
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from bzrlib import errors
 
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from bzrlib import osutils
 
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from loggerhead import util
 
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from loggerhead.controllers import TemplatedBranchView
 
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def _process_diff(difftext):
 
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    chunks = []
 
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    chunk = None
 
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    for line in difftext.splitlines():
 
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        if len(line) == 0:
 
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            continue
 
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        if line.startswith('+++ ') or line.startswith('--- '):
 
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            continue
 
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        if line.startswith('@@ '):
 
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            # new chunk
 
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            if chunk is not None:
 
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                chunks.append(chunk)
 
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            chunk = util.Container()
 
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            chunk.diff = []
 
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            split_lines = line.split(' ')[1:3]
 
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            lines = [int(x.split(',')[0][1:]) for x in split_lines]
 
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            old_lineno = lines[0]
 
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            new_lineno = lines[1]
 
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        elif line.startswith(' '):
 
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            chunk.diff.append(util.Container(old_lineno=old_lineno,
 
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                                             new_lineno=new_lineno,
 
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                                             type='context',
 
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                                             line=line[1:]))
 
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            old_lineno += 1
 
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            new_lineno += 1
 
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        elif line.startswith('+'):
 
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            chunk.diff.append(util.Container(old_lineno=None,
 
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                                             new_lineno=new_lineno,
 
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                                             type='insert', line=line[1:]))
 
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            new_lineno += 1
 
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        elif line.startswith('-'):
 
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            chunk.diff.append(util.Container(old_lineno=old_lineno,
 
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                                             new_lineno=None,
 
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                                             type='delete', line=line[1:]))
 
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            old_lineno += 1
 
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        else:
 
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            chunk.diff.append(util.Container(old_lineno=None,
 
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                                             new_lineno=None,
 
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                                             type='unknown',
 
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                                             line=repr(line)))
 
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    if chunk is not None:
 
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        chunks.append(chunk)
 
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    return chunks
 
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def diff_chunks_for_file(repository, file_id, compare_revid, revid):
 
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    lines = {}
 
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    args = []
 
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    for r in (compare_revid, revid):
 
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        if r == 'null:':
 
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            lines[r] = []
 
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        else:
 
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            args.append((file_id, r, r))
 
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    for r, bytes_iter in repository.iter_files_bytes(args):
 
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        lines[r] = osutils.split_lines(''.join(bytes_iter))
 
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    buffer = StringIO()
 
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    try:
 
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        diff.internal_diff('', lines[compare_revid], '', lines[revid], buffer)
 
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    except errors.BinaryFile:
 
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        difftext = ''
 
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    else:
 
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        difftext = buffer.getvalue()
 
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    return _process_diff(difftext)
 
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class FileDiffUI(TemplatedBranchView):
 
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    template_path = 'loggerhead.templates.filediff'
 
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    def get_values(self, path, kwargs, headers):
 
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        revid = urllib.unquote(self.args[0])
 
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        compare_revid = urllib.unquote(self.args[1])
 
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        file_id = urllib.unquote(self.args[2])
 
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        chunks = diff_chunks_for_file(
 
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            self._history._branch.repository, file_id, compare_revid, revid)
 
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        return {
 
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            'util': util,
 
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            'chunks': chunks,
 
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        }