// Copyright 2024 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 clap_complete::ArgValueCandidates;use jj_lib::config::ConfigNamePathBuf;use tracing::instrument; use super::ConfigLevelArgs;use crate::cli_util::CommandHelper;use crate::command_error::CommandError;use crate::command_error::user_error;use crate::command_error::user_error_with_message;use crate::complete;use crate::ui::Ui; /// Update a config file to unset the given option.#[derive(clap::Args, Clone, Debug)]pub struct ConfigUnsetArgs {    #[arg(required = true, add = ArgValueCandidates::new(complete::leaf_config_keys))]    name: ConfigNamePathBuf,    #[command(flatten)]    level: ConfigLevelArgs,} #[instrument(skip_all)]pub fn cmd_config_unset(    ui: &mut Ui,    command: &CommandHelper,    args: &ConfigUnsetArgs,) -> Result<(), CommandError> {    let mut file = args.level.edit_config_file(ui, command)?;    let old_value = file        .delete_value(&args.name)        .map_err(|err| user_error_with_message(format!("Failed to unset {}", args.name), err))?;    if old_value.is_none() {        return Err(user_error(format!(r#""{}" doesn't exist"#, args.name)));    }    file.save()?;    Ok(())}