// Copyright 2022 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 jj_cli::cli_util::{CliRunner, CommandError, CommandHelper};use jj_cli::ui::Ui; #[derive(clap::Parser, Clone, Debug)]enum CustomCommand {    Frobnicate(FrobnicateArgs),} /// Frobnicate a revisions#[derive(clap::Args, Clone, Debug)]struct FrobnicateArgs {    /// The revision to frobnicate    #[arg(default_value = "@")]    revision: String,} fn run_custom_command(    ui: &mut Ui,    command_helper: &CommandHelper,    command: CustomCommand,) -> Result<(), CommandError> {    match command {        CustomCommand::Frobnicate(args) => {            let mut workspace_command = command_helper.workspace_helper(ui)?;            let commit = workspace_command.resolve_single_rev(&args.revision, ui)?;            let mut tx = workspace_command.start_transaction();            let new_commit = tx                .mut_repo()                .rewrite_commit(command_helper.settings(), &commit)                .set_description("Frobnicated!")                .write()?;            tx.finish(ui, "Frobnicate")?;            writeln!(                ui.stderr(),                "Frobnicated revision: {}",                workspace_command.format_commit_summary(&new_commit)            )?;            Ok(())        }    }} fn main() -> std::process::ExitCode {    CliRunner::init().add_subcommand(run_custom_command).run()}