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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 std::rc::Rc; | ||
|
|
||
| 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. | ||
| /// | ||
| /// Running `jj parallelize 1::2` will transform the history like this: | ||
| /// ```text | ||
| /// 3 | ||
| /// | 3 | ||
| /// 2 / \ | ||
| /// | -> 1 2 | ||
| /// 1 \ / | ||
| /// | 0 | ||
| /// 0 | ||
| /// ``` | ||
| #[derive(clap::Args, Clone, Debug)] | ||
| #[command(verbatim_doc_comment)] | ||
| pub(crate) struct ParallelizeArgs { | ||
| /// Revisions to parallelize | ||
| 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)?; | ||
| // The target commits are the commits being parallelized. Ordered with parents | ||
| // before children. | ||
| let target_commits: Vec<CommitId> = workspace_command | ||
| .parse_union_revsets(&args.revisions)? | ||
| .evaluate_to_commit_ids()? | ||
| .collect(); | ||
| if target_commits.len() < 2 { | ||
| writeln!(ui.status(), "Nothing changed.")?; | ||
| return Ok(()); | ||
| } | ||
| workspace_command.check_rewritable(target_commits.iter())?; | ||
| let mut tx = workspace_command.start_transaction(); | ||
| let target_revset = RevsetExpression::commits(target_commits.clone()); | ||
| let target_head = get_head(&target_revset, tx.repo())?; | ||
| let target_root = get_root(&target_revset, tx.repo())?; | ||
| let connected_length = RevsetExpression::commits(vec![target_head, target_root.clone()]) | ||
| .connected() | ||
| .evaluate_programmatic(tx.repo())? | ||
| .iter() | ||
| .count(); | ||
| if connected_length != target_commits.len() { | ||
| return Err(user_error( | ||
| "Cannot parallelize since the target revisions are not connected.", | ||
| )); | ||
| } | ||
|
|
||
| // Rebase the non-target children of each target commit onto its new | ||
| // parents. A child which had a target commit as an ancestor before | ||
| // parallelize ran will have the target commit as a parent afterward. | ||
| for (i, target_commit) in target_commits.iter().enumerate() { | ||
| // These parents are shared by all children of the target commit and | ||
| // include the target commit itself plus any of its ancestors which are | ||
| // being parallelized. The commits in `target_commits` form a linear | ||
| // chain ordered with parents before children. | ||
| let common_parents: IndexSet<CommitId> = target_commits[i..].iter().cloned().collect(); | ||
| // Children of the target commit, excluding other target commits. | ||
| let children: Vec<Commit> = RevsetExpression::commit(target_commit.clone()) | ||
| .children() | ||
| .minus(&target_revset) | ||
| .evaluate_programmatic(tx.repo())? | ||
| .iter() | ||
| .commits(tx.repo().store()) | ||
| .try_collect()?; | ||
| for child in children { | ||
| let mut new_parents = common_parents.clone(); | ||
| new_parents.extend(child.parent_ids().iter().cloned()); | ||
| let parents: Vec<Commit> = new_parents | ||
| .iter() | ||
| .map(|c| tx.repo().store().get_commit(c)) | ||
| .try_collect()?; | ||
| rebase_descendants( | ||
| &mut tx, | ||
| command.settings(), | ||
| &parents, | ||
| &[child], | ||
| Default::default(), | ||
| )?; | ||
| } | ||
| } | ||
|
|
||
| // Rebase the target commits onto the parents of the root commit. | ||
| let new_parents = tx.repo().store().get_commit(&target_root)?.parents(); | ||
| // We need to reverse the iterator so that when we rebase the target commits | ||
| // they will appear in the same relative order in `jj log` that they were in | ||
| // before being parallelized. | ||
| let target_commits: Vec<Commit> = target_commits | ||
| .iter() | ||
| // Children before parents. | ||
| .rev() | ||
| .map(|c| tx.repo().store().get_commit(c)) | ||
| .try_collect()?; | ||
| rebase_descendants( | ||
| &mut tx, | ||
| command.settings(), | ||
| &new_parents, | ||
| &target_commits, | ||
| Default::default(), | ||
| )?; | ||
|
|
||
| tx.finish(ui, format!("parallelized {} commits", target_commits.len())) | ||
| } | ||
|
|
||
| // Returns the head of the target revset or an error if the revset has multiple | ||
| // heads. | ||
| fn get_head( | ||
| target_revset: &Rc<RevsetExpression>, | ||
| repo: &dyn Repo, | ||
| ) -> Result<CommitId, CommandError> { | ||
| let mut target_heads: Vec<CommitId> = target_revset | ||
| .heads() | ||
| .evaluate_programmatic(repo)? | ||
| .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}" | ||
| ))); | ||
| } | ||
| Ok(target_heads.pop().unwrap()) | ||
| } | ||
|
|
||
| // Returns the root of the target revset or an error if the revset has multiple | ||
| // roots. | ||
| fn get_root( | ||
| target_revset: &Rc<RevsetExpression>, | ||
| repo: &dyn Repo, | ||
| ) -> Result<CommitId, CommandError> { | ||
| let mut target_roots: Vec<CommitId> = target_revset | ||
| .roots() | ||
| .evaluate_programmatic(repo)? | ||
| .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}" | ||
| ))); | ||
| } | ||
| Ok(target_roots.pop().unwrap()) | ||
| } |
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