How to use the datalad.auto._EarlyExit function in datalad

# so the name was missing etc, just proxy into original open call and let it puke
                        raise _EarlyExit("no name/file was given")
                    file = kwargs.get(filearg)

                if isinstance(file, int):
                    raise _EarlyExit("already a file descriptor")

                if self._paths_cache is not None:
                    filefull = file if isabs(file) else os.path.abspath(file)
                    if filefull in self._paths_cache:
                        raise _EarlyExit("considered before")
                    else:
                        self._paths_cache.add(filefull)

                if _DOT_GIT_DIR in file:
                    raise _EarlyExit("we ignore paths under .git/")
                mode = 'r'
                if len(args) > 1:
                    mode = args[1]
                elif 'mode' in kwargs:
                    mode = kwargs['mode']

                if 'r' in mode:
                    self._dataset_auto_get(file)
                else:
                    raise _EarlyExit("mode=%r", mode)
        except _EarlyExit as e:
            lgr.log(2, " skipping since " + e.msg, *e.args,
                    extra={'notraceback': True})
        except Exception as e:
            # If anything goes wrong -- we should complain and proceed
            with self._patch(origname, origfunc):

def _proxy_open_name_mode(self, origname, origfunc, *args, **kwargs):
        """Proxy for various "open" which have first argument name and 2nd - mode

        """
        # wrap it all for resilience to errors -- proxying must do no harm!
        try:
            if self._in_open:
                raise _EarlyExit("within open already")
            self._in_open = True  # just in case someone kept alias/assignment
            # return stock open for the duration of handling so that
            # logging etc could workout correctly
            with self._patch(origname, origfunc):
                lgr.log(3, "Proxying open with %r %r", args, kwargs)

                # had to go with *args since in PY2 it is name, in PY3 file
                # deduce arguments
                if len(args) > 0:
                    # name/file was provided
                    file = args[0]
                else:
                    filearg = "name" if PY2 else "file"
                    if filearg not in kwargs:
                        # so the name was missing etc, just proxy into original open call and let it puke
                        raise _EarlyExit("no name/file was given")

lgr.log(3, "Proxying open with %r %r", args, kwargs)

                # had to go with *args since in PY2 it is name, in PY3 file
                # deduce arguments
                if len(args) > 0:
                    # name/file was provided
                    file = args[0]
                else:
                    filearg = "name" if PY2 else "file"
                    if filearg not in kwargs:
                        # so the name was missing etc, just proxy into original open call and let it puke
                        raise _EarlyExit("no name/file was given")
                    file = kwargs.get(filearg)

                if isinstance(file, int):
                    raise _EarlyExit("already a file descriptor")

                if self._paths_cache is not None:
                    filefull = file if isabs(file) else os.path.abspath(file)
                    if filefull in self._paths_cache:
                        raise _EarlyExit("considered before")
                    else:
                        self._paths_cache.add(filefull)

                if _DOT_GIT_DIR in file:
                    raise _EarlyExit("we ignore paths under .git/")
                mode = 'r'
                if len(args) > 1:
                    mode = args[1]
                elif 'mode' in kwargs:
                    mode = kwargs['mode']

# name/file was provided
                    file = args[0]
                else:
                    filearg = "name" if PY2 else "file"
                    if filearg not in kwargs:
                        # so the name was missing etc, just proxy into original open call and let it puke
                        raise _EarlyExit("no name/file was given")
                    file = kwargs.get(filearg)

                if isinstance(file, int):
                    raise _EarlyExit("already a file descriptor")

                if self._paths_cache is not None:
                    filefull = file if isabs(file) else os.path.abspath(file)
                    if filefull in self._paths_cache:
                        raise _EarlyExit("considered before")
                    else:
                        self._paths_cache.add(filefull)

                if _DOT_GIT_DIR in file:
                    raise _EarlyExit("we ignore paths under .git/")
                mode = 'r'
                if len(args) > 1:
                    mode = args[1]
                elif 'mode' in kwargs:
                    mode = kwargs['mode']

                if 'r' in mode:
                    self._dataset_auto_get(file)
                else:
                    raise _EarlyExit("mode=%r", mode)
        except _EarlyExit as e:

raise _EarlyExit("considered before")
                    else:
                        self._paths_cache.add(filefull)

                if _DOT_GIT_DIR in file:
                    raise _EarlyExit("we ignore paths under .git/")
                mode = 'r'
                if len(args) > 1:
                    mode = args[1]
                elif 'mode' in kwargs:
                    mode = kwargs['mode']

                if 'r' in mode:
                    self._dataset_auto_get(file)
                else:
                    raise _EarlyExit("mode=%r", mode)
        except _EarlyExit as e:
            lgr.log(2, " skipping since " + e.msg, *e.args,
                    extra={'notraceback': True})
        except Exception as e:
            # If anything goes wrong -- we should complain and proceed
            with self._patch(origname, origfunc):
                lgr.warning("Failed proxying open with %r, %r: %s", args, kwargs, exc_str(e))
        finally:
            self._in_open = False
        # finally give it back to stock open
        return origfunc(*args, **kwargs)

self._in_open = True  # just in case someone kept alias/assignment
            # return stock open for the duration of handling so that
            # logging etc could workout correctly
            with self._patch(origname, origfunc):
                lgr.log(3, "Proxying open with %r %r", args, kwargs)

                # had to go with *args since in PY2 it is name, in PY3 file
                # deduce arguments
                if len(args) > 0:
                    # name/file was provided
                    file = args[0]
                else:
                    filearg = "name" if PY2 else "file"
                    if filearg not in kwargs:
                        # so the name was missing etc, just proxy into original open call and let it puke
                        raise _EarlyExit("no name/file was given")
                    file = kwargs.get(filearg)

                if isinstance(file, int):
                    raise _EarlyExit("already a file descriptor")

                if self._paths_cache is not None:
                    filefull = file if isabs(file) else os.path.abspath(file)
                    if filefull in self._paths_cache:
                        raise _EarlyExit("considered before")
                    else:
                        self._paths_cache.add(filefull)

                if _DOT_GIT_DIR in file:
                    raise _EarlyExit("we ignore paths under .git/")
                mode = 'r'
                if len(args) > 1: