How to use the xonsh.tools function in xonsh

def _dynamically_collapsed_pwd():
    """Return the compact current working directory.  It respects the
    environment variable DYNAMIC_CWD_WIDTH.
    """
    original_path = _replace_home_cwd()
    target_width, units = builtins.__xonsh_env__["DYNAMIC_CWD_WIDTH"]
    elision_char = builtins.__xonsh_env__["DYNAMIC_CWD_ELISION_CHAR"]
    if target_width == float("inf"):
        return original_path
    if units == "%":
        cols, _ = shutil.get_terminal_size()
        target_width = (cols * target_width) // 100
    sep = xt.get_sep()
    pwd = original_path.split(sep)
    last = pwd.pop()
    remaining_space = target_width - len(last)
    # Reserve space for separators
    remaining_space_for_text = remaining_space - len(pwd)
    parts = []
    for i in range(len(pwd)):
        part = pwd[i]
        part_len = int(
            min(len(part), max(1, remaining_space_for_text // (len(pwd) - i)))
        )
        remaining_space_for_text -= part_len
        if len(part) > part_len:
            reduced_part = part[0 : part_len - len(elision_char)] + elision_char
            parts.append(reduced_part)
        else:

toks = basetoks * (headlen // baselen)
    n = headlen % baselen
    count = 0
    for tok in basetoks:
        slen = len(tok[1])
        newcount = slen + count
        if slen == 0:
            continue
        elif newcount <= n:
            toks.append(tok)
        else:
            toks.append((tok[0], tok[1][: n - count]))
        count = newcount
        if n <= count:
            break
    toks.append((xt.format_color("{NO_COLOR}", hide=True), tail))
    rtn = "".join(itertools.chain.from_iterable(toks))
    return rtn

def _collapsed_pwd():
    sep = xt.get_sep()
    pwd = _replace_home_cwd().split(sep)
    l = len(pwd)
    leader = sep if l > 0 and len(pwd[0]) == 0 else ""
    base = [i[0] if ix != l - 1 else i for ix, i in enumerate(pwd) if len(i) > 0]
    return leader + sep.join(base)

def _path_from_partial_string(inp, pos=None):
    if pos is None:
        pos = len(inp)
    partial = inp[:pos]
    startix, endix, quote = xt.check_for_partial_string(partial)
    _post = ""
    if startix is None:
        return None
    elif endix is None:
        string = partial[startix:]
    else:
        if endix != pos:
            _test = partial[endix:pos]
            if not any(i == " " for i in _test):
                _post = _test
            else:
                return None
        string = partial[startix:endix]
    end = xt.RE_STRING_START.sub("", quote)
    _string = string
    if not _string.endswith(end):

def attr_complete(prefix, ctx, filter_func):
    """Complete attributes of an object."""
    attrs = set()
    m = RE_ATTR.match(prefix)
    if m is None:
        return attrs
    expr, attr = m.group(1, 3)
    expr = xt.subexpr_from_unbalanced(expr, "(", ")")
    expr = xt.subexpr_from_unbalanced(expr, "[", "]")
    expr = xt.subexpr_from_unbalanced(expr, "{", "}")
    val, _ctx = _safe_eval(expr, ctx)
    if val is None and _ctx is None:
        return attrs
    if len(attr) == 0:
        opts = [o for o in dir(val) if not o.startswith("_")]
    else:
        opts = [o for o in dir(val) if filter_func(o, attr)]
    prelen = len(prefix)
    for opt in opts:
        # check whether these options actually work (e.g., disallow 7.imag)
        _expr = "{0}.{1}".format(expr, opt)
        _val_, _ctx_ = _safe_eval(_expr, _ctx)
        if _val_ is None and _ctx_ is None:
            continue
        a = getattr(val, opt)

def _xh_sqlite_get_file_name():
    envs = builtins.__xonsh_env__
    file_name = envs.get("XONSH_HISTORY_SQLITE_FILE")
    if not file_name:
        data_dir = envs.get("XONSH_DATA_DIR")
        file_name = os.path.join(data_dir, "xonsh-history.sqlite")
    return xt.expanduser_abs_path(file_name)

def complete_command(cmd, line, start, end, ctx):
    """
    Returns a list of valid commands starting with the first argument
    """
    space = " "
    out = {
        s + space
        for s in builtins.__xonsh__.commands_cache
        if get_filter_function()(s, cmd)
    }
    if xp.ON_WINDOWS:
        out |= {i for i in xt.executables_in(".") if i.startswith(cmd)}
    base = os.path.basename(cmd)
    if os.path.isdir(base):
        out |= {
            os.path.join(base, i) for i in xt.executables_in(base) if i.startswith(cmd)
        }
    return out

def run(self):
        while self.wait_for_shell:
            time.sleep(0.01)
        if self.size is not None:
            hsize, units = xt.to_history_tuple(self.size)
        else:
            envs = builtins.__xonsh_env__
            hsize, units = envs.get("XONSH_HISTORY_SIZE")
        if units != "commands":
            print(
                "sqlite backed history gc currently only supports "
                '"commands" as units',
                file=sys.stderr,
            )
            return
        if hsize < 0:
            return
        xh_sqlite_delete_items(hsize, filename=self.filename)

def python_signature_complete(prefix, line, end, ctx, filter_func):
    """Completes a python function (or other callable) call by completing
    argument and keyword argument names.
    """
    front = line[:end]
    if xt.is_balanced(front, "(", ")"):
        return set()
    funcname = xt.subexpr_before_unbalanced(front, "(", ")")
    val, _ctx = _safe_eval(funcname, ctx)
    if val is None:
        return set()
    try:
        sig = inspect.signature(val)
    except ValueError:
        return set()
    args = {p + "=" for p in sig.parameters if filter_func(p, prefix)}
    return args