// 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 clap_complete::ArgValueCompleter;use jj_lib::object_id::ObjectId as _;use tracing::instrument; use crate::cli_util::CommandHelper;use crate::cli_util::RevisionArg;use crate::command_error::CommandError;use crate::complete;use crate::ui::Ui; /// Sets the specified revision as the working-copy revision////// Note: it is [generally recommended] to instead use `jj new` and `jj/// squash`.////// [generally recommended]:///     https://docs.jj-vcs.dev/latest/FAQ#how-do-i-resume-working-on-an-existing-change#[derive(clap::Args, Clone, Debug)]#[command(group(clap::ArgGroup::new("revision").required(true)))]pub(crate) struct EditArgs {    /// The commit to edit [aliases: -r]    #[arg(group = "revision", value_name = "REVSET")]    #[arg(add = ArgValueCompleter::new(complete::revset_expression_mutable))]    revision_pos: Option<RevisionArg>,     #[arg(short = 'r', group = "revision", hide = true, value_name = "REVSET")]    #[arg(add = ArgValueCompleter::new(complete::revset_expression_mutable))]    revision_opt: Option<RevisionArg>,} #[instrument(skip_all)]pub(crate) async fn cmd_edit(    ui: &mut Ui,    command: &CommandHelper,    args: &EditArgs,) -> Result<(), CommandError> {    let mut workspace_command = command.workspace_helper(ui).await?;    let revision_arg = args        .revision_pos        .as_ref()        .or(args.revision_opt.as_ref())        .expect("either positional or -r arg should be provided");    let new_commit = workspace_command        .resolve_single_rev(ui, revision_arg)        .await?;    workspace_command        .check_rewritable([new_commit.id()])        .await?;    if workspace_command.get_wc_commit_id() == Some(new_commit.id()) {        writeln!(ui.status(), "Already editing that commit.")?;    } else {        let mut tx = workspace_command.start_transaction();        tx.edit(&new_commit)?;        tx.finish(ui, format!("edit commit {}", new_commit.id().hex()))            .await?;    }    Ok(())}