// Copyright 2020 The Jujutsu Authors//// Licensed under the Apache License, Version 2.0 (the "License");// you may not use this file except in compliance with the License.// You may obtain a copy of the License at//// https://www.apache.org/licenses/LICENSE-2.0//// Unless required by applicable law or agreed to in writing, software// distributed under the License is distributed on an "AS IS" BASIS,// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.// See the License for the specific language governing permissions and// limitations under the License. use std::io::Write as _;use std::path::Path; use tracing::instrument; use crate::cli_util::CommandHelper;use crate::command_error::CommandError;use crate::ui::Ui; /// List the patterns that are currently present in the working copy////// By default, a newly cloned or initialized repo will have have a pattern/// matching all files from the repo root. That pattern is rendered as `.` (a/// single period).#[derive(clap::Args, Clone, Debug)]pub struct SparseListArgs {} #[instrument(skip_all)]pub fn cmd_sparse_list(    ui: &mut Ui,    command: &CommandHelper,    _args: &SparseListArgs,) -> Result<(), CommandError> {    let workspace_command = command.workspace_helper(ui)?;    for path in workspace_command.working_copy().sparse_patterns()? {        writeln!(            ui.stdout(),            "{}",            path.to_fs_path_unchecked(Path::new("")).display()        )?;    }    Ok(())}