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| // 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 std::io::Write; | ||
|
|
||
| use indexmap::IndexSet; | ||
| use itertools::Itertools; | ||
| use jj_lib::backend::CommitId; | ||
| use jj_lib::commit::Commit; | ||
| use jj_lib::repo::Repo; | ||
| use jj_lib::revset::{RevsetExpression, RevsetIteratorExt}; | ||
| use tracing::instrument; | ||
|
|
||
| use crate::cli_util::{short_commit_hash, CommandHelper, RevisionArg}; | ||
| use crate::command_error::{user_error, CommandError}; | ||
| use crate::commands::rebase::rebase_descendants; | ||
| use crate::ui::Ui; | ||
|
|
||
| /// Parallelize revisions by making them siblings | ||
| /// | ||
| /// The set of target commits being parallelized must have a single head and | ||
| /// root commit (not to be confused with the repo root), otherwise the command | ||
| /// will fail. Each of the target commits is rebased onto the parents of the | ||
| /// root commit. The children of the head commit are rebased onto the target | ||
| /// commits. | ||
| /// | ||
| /// Example usage: | ||
| /// ```text | ||
| /// jj log | ||
| /// ◉ 3 | ||
| /// ◉ 2 | ||
| /// ◉ 1 | ||
| /// ◉ | ||
| /// jj parallelize 1::2 | ||
| /// jj log | ||
| /// ◉ 3 | ||
| /// ├─╮ | ||
| /// │ ◉ 2 | ||
| /// ◉ │ 1 | ||
| /// ├─╯ | ||
| /// ◉ | ||
| /// ``` | ||
| #[derive(clap::Args, Clone, Debug)] | ||
| #[command(verbatim_doc_comment)] | ||
| pub(crate) struct ParallelizeArgs { | ||
| // #[arg(long, short)] | ||
| revisions: Vec<RevisionArg>, | ||
| } | ||
|
|
||
| #[instrument(skip_all)] | ||
| pub(crate) fn cmd_parallelize( | ||
| ui: &mut Ui, | ||
| command: &CommandHelper, | ||
| args: &ParallelizeArgs, | ||
| ) -> Result<(), CommandError> { | ||
| let mut workspace_command = command.workspace_helper(ui)?; | ||
| // Parse and validate the input revset(s). | ||
| // Find the parents of each commit. The parent(s) which are ancestors of | ||
| // each revision are the new parents of the input revisions. | ||
| // Find the children of each commit. The children which are descendants | ||
| // of each revision are the new children of the input revisions. | ||
| // If one or both of these sets cannot be found, then parallelize cannot | ||
| // proceed. | ||
| // let target_commits = workspace_command.parse_union_revsets(&args.revisions)?. | ||
| let mut tx = workspace_command.start_transaction(); | ||
| let target_revset = tx | ||
| .base_workspace_helper() | ||
| .parse_union_revsets(&args.revisions)?; | ||
| let target_commits: Vec<Commit> = tx | ||
| .base_workspace_helper() | ||
| .evaluate_revset(target_revset.clone())? | ||
| .iter() | ||
| // We want parents before children, so we need to reverse the order. | ||
| .reversed() | ||
| .commits(tx.base_repo().store()) | ||
| .try_collect::<_, Vec<Commit>, _>()?; | ||
| if target_commits.len() < 2 { | ||
| return Ok(writeln!(ui.stderr(), "Nothing to do.")?); | ||
| } | ||
| let target_heads: Vec<CommitId> = tx | ||
| .base_workspace_helper() | ||
| .evaluate_revset(target_revset.clone().heads())? | ||
| .iter() | ||
| .collect(); | ||
| if target_heads.len() > 1 { | ||
| let heads = target_heads.iter().map(short_commit_hash).join(", "); | ||
| return Err(user_error(format!( | ||
| "Cannot parallelize a set of revisions with multiple heads. Heads: {heads}" | ||
| ))); | ||
| } | ||
| let target_roots: Vec<CommitId> = tx | ||
| .base_workspace_helper() | ||
| .evaluate_revset(target_revset.roots())? | ||
| .iter() | ||
| .collect(); | ||
| if target_roots.len() > 1 { | ||
| let roots = target_roots.iter().map(short_commit_hash).join(", "); | ||
| return Err(user_error(format!( | ||
| "Cannot parallelize a set of revisions with multiple roots. Roots: {roots}" | ||
| ))); | ||
| } | ||
|
|
||
| // Rebase the children of the head commit onto the target commits. | ||
| let new_children: Vec<Commit> = RevsetExpression::commit(target_heads[0].clone()) | ||
| .children() | ||
| .evaluate_programmatic(tx.base_repo().as_ref())? | ||
| .iter() | ||
| .commits(tx.base_repo().store()) | ||
| .try_collect()?; | ||
| for child in new_children { | ||
| // The ordering here is intentional. We iterate over the target commits first so | ||
| // that when `jj log` prints the graph they will be printed in their original | ||
| // order. After that, we add any existing parents which aren't being | ||
| // parallelized. | ||
| let get_id = |c: &Commit| c.id().clone(); | ||
| let new_parents_for_child: Vec<Commit> = target_commits | ||
| .iter() | ||
| .map(get_id) | ||
| .chain(child.parents().iter().map(get_id)) | ||
| .collect::<IndexSet<CommitId>>() | ||
| .iter() | ||
| .map(|c| tx.mut_repo().store().get_commit(c)) | ||
| .collect::<Result<Vec<Commit>, _>>()?; | ||
| rebase_descendants( | ||
| &mut tx, | ||
| command.settings(), | ||
| &new_parents_for_child, | ||
| &[child], | ||
| Default::default(), | ||
| )?; | ||
| } | ||
|
|
||
| // Rebase the target commits onto the parents of the root commit. | ||
| let new_parents: Vec<Commit> = RevsetExpression::commit(target_roots[0].clone()) | ||
| .parents() | ||
| .evaluate_programmatic(tx.base_repo().as_ref())? | ||
| .iter() | ||
| .commits(tx.base_repo().store()) | ||
| .try_collect()?; | ||
| rebase_descendants( | ||
| &mut tx, | ||
| command.settings(), | ||
| &new_parents, | ||
| &target_commits, | ||
| Default::default(), | ||
| )?; | ||
|
|
||
| tx.finish( | ||
| ui, | ||
| format!("Parallelized {} commits.", target_commits.len()), | ||
| ) | ||
| } |
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