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[merge] aaron, various fixes

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bzrlib/diff.py
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# invoke callbacks on an object.  That object can either accumulate a
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# list, write them out directly, etc etc.
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def internal_diff(old_label, oldlines, new_label, newlines, to_file):
 
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def internal_diff(old_filename, oldlines, new_filename, 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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        return
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    ud = difflib.unified_diff(oldlines, newlines,
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                              fromfile=old_label, tofile=new_label)
 
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                              fromfile=old_filename+'\t', 
 
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                              tofile=new_filename+'\t')
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    ud = list(ud)
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    # work-around for difflib being too smart for its own good
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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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def external_diff(old_filename, oldlines, new_filename, 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 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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                   '--label', old_filename+'\t',
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                   oldtmpf.name,
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                   '--label', new_label,
 
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                   '--label', new_filename+'\t',
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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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        newtmpf.close()
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def show_diff(b, from_spec, specific_files, external_diff_options=None,
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              revision2=None, output=None):
 
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              revision2=None, output=None, b2=None):
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    """Shortcut for showing the diff to the working tree.
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    b
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        output = sys.stdout
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    if from_spec is None:
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        old_tree = b.basis_tree()
 
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        if b2 is None:
 
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            old_tree = b.basis_tree()
 
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        else:
 
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            old_tree = b.working_tree()
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    else:
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        old_tree = b.revision_tree(from_spec.in_history(b).rev_id)
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    if revision2 is None:
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        new_tree = b.working_tree()
 
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        if b2 is None:
 
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            new_tree = b.working_tree()
 
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        else:
 
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            new_tree = b2.working_tree()
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    else:
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        new_tree = b.revision_tree(revision2.in_history(b).rev_id)
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