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bzrlib/msgeditor.py
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    """Return a sequence of possible editor binaries for the current platform"""
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    from bzrlib.osutils import _read_config_value
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    try:
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        yield os.environ["BZR_EDITOR"]
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    except KeyError:
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        pass
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    e = _read_config_value("editor")
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    if e is not None:
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        yield e
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    try:
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        yield os.environ["EDITOR"]
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    except KeyError:
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        pass
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    if os.name == "nt":
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        yield "notepad.exe"
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    elif os.name == "posix":
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        yield "/usr/bin/vi"
 
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        if os.name == "nt":
 
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            yield "notepad.exe"
 
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        elif os.name == "posix":
 
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            yield "/usr/bin/vi"
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def _run_editor(filename):
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            msg.append(line)
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        if len(msg) == 0:
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            return ""
 
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            return None
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        # delete empty lines at the end
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        del msg[lastline:]
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        # add a newline at the end, if needed