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  • Committer: Canonical.com Patch Queue Manager
  • Date: 2007-12-27 15:01:46 UTC
  • mfrom: (3123.6.3 no-inventory2)
  • Revision ID: pqm@pqm.ubuntu.com-20071227150146-08nqv2gvo5e3i1n3
Implement native support for --using (abentley)

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bzrlib/diff.py
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import difflib
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import os
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import re
 
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import shutil
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import sys
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from bzrlib.lazy_import import lazy_import
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from bzrlib import (
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    bzrdir,
 
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    commands,
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    errors,
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    osutils,
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    patiencediff,
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                    external_diff_options=None,
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                    old_label='a/', new_label='b/',
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                    extra_trees=None,
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                    path_encoding='utf8'):
 
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                    path_encoding='utf8',
 
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                    using=None):
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    """Show in text form the changes from one tree to another.
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    to_file
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        new_tree.lock_read()
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        try:
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            differ = DiffTree.from_trees_options(old_tree, new_tree, to_file,
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                                                   path_encoding,
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                                                   external_diff_options,
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                                                   old_label, new_label)
 
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                                                 path_encoding,
 
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                                                 external_diff_options,
 
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                                                 old_label, new_label, using)
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            return differ.show_diff(specific_files, extra_trees)
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        finally:
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            new_tree.unlock()
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        self.to_file = to_file
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        self.path_encoding = path_encoding
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    def finish(self):
 
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        pass
 
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    @classmethod
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    def from_diff_tree(klass, diff_tree):
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        return klass(diff_tree.old_tree, diff_tree.new_tree,
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    def __init__(self, differs):
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        self.differs = differs
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    def finish(self):
 
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        pass
 
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    @classmethod
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    def from_diff_tree(klass, diff_tree):
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        return klass(diff_tree.differs)
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        return self.CHANGED
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class DiffFromTool(DiffPath):
 
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    def __init__(self, command_template, old_tree, new_tree, to_file,
 
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                 path_encoding='utf-8'):
 
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        DiffPath.__init__(self, old_tree, new_tree, to_file, path_encoding)
 
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        self.command_template = command_template
 
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        self._root = tempfile.mkdtemp(prefix='bzr-diff-')
 
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    @classmethod
 
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    def from_string(klass, command_string, old_tree, new_tree, to_file,
 
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                    path_encoding='utf-8'):
 
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        command_template = commands.shlex_split_unicode(command_string)
 
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        command_template.extend(['%(old_path)s', '%(new_path)s'])
 
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        return klass(command_template, old_tree, new_tree, to_file,
 
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                     path_encoding)
 
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    @classmethod
 
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    def make_from_diff_tree(klass, command_string):
 
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        def from_diff_tree(diff_tree):
 
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            return klass.from_string(command_string, diff_tree.old_tree,
 
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                                     diff_tree.new_tree, diff_tree.to_file)
 
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        return from_diff_tree
 
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    def _get_command(self, old_path, new_path):
 
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        my_map = {'old_path': old_path, 'new_path': new_path}
 
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        return [t % my_map for t in self.command_template]
 
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    def _execute(self, old_path, new_path):
 
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        proc = subprocess.Popen(self._get_command(old_path, new_path),
 
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                                stdout=subprocess.PIPE, cwd=self._root)
 
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        self.to_file.write(proc.stdout.read())
 
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        return proc.wait()
 
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    def _write_file(self, file_id, tree, prefix, old_path):
 
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        full_old_path = osutils.pathjoin(self._root, prefix, old_path)
 
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        parent_dir = osutils.dirname(full_old_path)
 
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        try:
 
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            os.makedirs(parent_dir)
 
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        except OSError, e:
 
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            if e.errno != errno.EEXIST:
 
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                raise
 
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        source = tree.get_file(file_id)
 
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        try:
 
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            target = open(full_old_path, 'wb')
 
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            try:
 
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                osutils.pumpfile(source, target)
 
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            finally:
 
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                target.close()
 
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        finally:
 
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            source.close()
 
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        return full_old_path
 
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    def _prepare_files(self, file_id, old_path, new_path):
 
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        old_disk_path = self._write_file(file_id, self.old_tree, 'old',
 
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                                         old_path)
 
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        new_disk_path = self._write_file(file_id, self.new_tree, 'new',
 
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                                         new_path)
 
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        return old_disk_path, new_disk_path
 
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    def finish(self):
 
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        shutil.rmtree(self._root)
 
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    def diff(self, file_id, old_path, new_path, old_kind, new_kind):
 
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        if (old_kind, new_kind) != ('file', 'file'):
 
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            return DiffPath.CANNOT_DIFF
 
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        self._prepare_files(file_id, old_path, new_path)
 
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        self._execute(osutils.pathjoin('old', old_path),
 
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                      osutils.pathjoin('new', new_path))
 
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class DiffTree(object):
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    """Provides textual representations of the difference between two trees.
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    @classmethod
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    def from_trees_options(klass, old_tree, new_tree, to_file,
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                           path_encoding, external_diff_options, old_label,
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                           new_label):
 
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                           new_label, using):
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        """Factory for producing a DiffTree.
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        Designed to accept options used by show_diff_trees.
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            binary to perform file comparison, using supplied options.
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        :param old_label: Prefix to use for old file labels
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        :param new_label: Prefix to use for new file labels
 
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        :param using: Commandline to use to invoke an external diff tool
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        """
 
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        if using is not None:
 
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            extra_factories = [DiffFromTool.make_from_diff_tree(using)]
 
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        else:
 
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            extra_factories = []
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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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            diff_file = internal_diff
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        diff_text = DiffText(old_tree, new_tree, to_file, path_encoding,
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                             old_label, new_label, diff_file)
806
 
        return klass(old_tree, new_tree, to_file, path_encoding, diff_text)
 
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        return klass(old_tree, new_tree, to_file, path_encoding, diff_text,
 
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                     extra_factories)
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    def show_diff(self, specific_files, extra_trees=None):
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        """Write tree diff to self.to_file
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        :param sepecific_files: the specific files to compare (recursive)
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        :param extra_trees: extra trees to use for mapping paths to file_ids
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        """
 
899
        try:
 
900
            return self._show_diff(specific_files, extra_trees)
 
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        finally:
 
902
            for differ in self.differs:
 
903
                differ.finish()
 
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905
    def _show_diff(self, specific_files, extra_trees):
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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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        iterator = self.new_tree._iter_changes(self.old_tree,