// Copyright 2025 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::PathBuf; use itertools::Itertools as _;use jj_lib::stacked_table::TableSegment as _;use jj_lib::stacked_table::TableStore; use crate::cli_util::CommandHelper;use crate::command_error::CommandError;use crate::command_error::user_error_with_message;use crate::ui::Ui; /// Show stats of stacked table#[derive(clap::Args, Clone, Debug)]pub struct DebugStackedTableArgs {    /// Path to table store directory    #[arg(value_hint = clap::ValueHint::DirPath)]    dir: String,     /// Key size in bytes    #[arg(long, short = 'n')]    key_size: usize,} pub async fn cmd_debug_stacked_table(    ui: &mut Ui,    _command: &CommandHelper,    args: &DebugStackedTableArgs,) -> Result<(), CommandError> {    let store = TableStore::load(PathBuf::from(&args.dir), args.key_size);    let table = store        .get_head()        .map_err(|err| user_error_with_message("Failed to load stacked table", err))?;    let mut table_segments = table.ancestor_segments().collect_vec();    table_segments.reverse();     let total_num_entries: usize = table_segments        .iter()        .map(|table| table.segment_num_entries())        .sum();    writeln!(ui.stdout(), "Number of entries: {total_num_entries}")?;     writeln!(ui.stdout(), "Stats per level:")?;    for (i, table) in table_segments.iter().enumerate() {        writeln!(ui.stdout(), "  Level {i}:")?;        writeln!(            ui.stdout(),            "    Number of entries: {}",            table.segment_num_entries()        )?;        writeln!(ui.stdout(), "    Name: {}", table.name())?;    }    Ok(())}