// Copyright 2023 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::fmt::Debug;use std::io::Write as _; use jj_lib::object_id::ObjectId as _;use jj_lib::revset;use jj_lib::revset::RevsetDiagnostics; use crate::cli_util::CommandHelper;use crate::command_error::print_parse_diagnostics;use crate::command_error::CommandError;use crate::revset_util;use crate::ui::Ui; /// Evaluate revset to full commit IDs#[derive(clap::Args, Clone, Debug)]pub struct DebugRevsetArgs {    revision: String,} pub fn cmd_debug_revset(    ui: &mut Ui,    command: &CommandHelper,    args: &DebugRevsetArgs,) -> Result<(), CommandError> {    let workspace_command = command.workspace_helper(ui)?;    let workspace_ctx = workspace_command.env().revset_parse_context();    let repo = workspace_command.repo().as_ref();     let mut diagnostics = RevsetDiagnostics::new();    let expression = revset::parse(&mut diagnostics, &args.revision, &workspace_ctx)?;    print_parse_diagnostics(ui, "In revset expression", &diagnostics)?;    writeln!(ui.stdout(), "-- Parsed:")?;    writeln!(ui.stdout(), "{expression:#?}")?;    writeln!(ui.stdout())?;     let symbol_resolver = revset_util::default_symbol_resolver(        repo,        command.revset_extensions().symbol_resolvers(),        workspace_command.id_prefix_context(),    );    let expression = expression.resolve_user_expression(repo, &symbol_resolver)?;    writeln!(ui.stdout(), "-- Resolved:")?;    writeln!(ui.stdout(), "{expression:#?}")?;    writeln!(ui.stdout())?;     let expression = revset::optimize(expression);    writeln!(ui.stdout(), "-- Optimized:")?;    writeln!(ui.stdout(), "{expression:#?}")?;    writeln!(ui.stdout())?;     let backend_expression = expression.to_backend_expression(repo);    writeln!(ui.stdout(), "-- Backend:")?;    writeln!(ui.stdout(), "{backend_expression:#?}")?;    writeln!(ui.stdout())?;     let revset = expression.evaluate_unoptimized(repo)?;    writeln!(ui.stdout(), "-- Evaluated:")?;    writeln!(ui.stdout(), "{revset:#?}")?;    writeln!(ui.stdout())?;     writeln!(ui.stdout(), "-- Commit IDs:")?;    for commit_id in revset.iter() {        writeln!(ui.stdout(), "{}", commit_id?.hex())?;    }    Ok(())}