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cli: add jj rebase -s
and make jj rebase -r
rebase descendants onto parents
I think it makes sense to have a version of rebase that rebases the descendants of the rebased commit onto the parents of the rebased commit. Let's make `jj rebase -r` do just that. Let's also add `jj rebase -s` (matching Mercurial's `hg rebase -s`) for rebasing a commit and its descendants onto another commit. Since both flavors of the command now explicitly rebase the descendants (just to different destinations), I also made the command not evolve orphans afterwards. That would have made sense regardless of this commit.
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README.md
12
README.md
@ -314,8 +314,8 @@ We now have a few commits, where A, B1, and B2 modify the same file, while C
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modifies a different file. We checked out A in order to simplify the next steps.
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Let's now rebase B2 directly onto A:
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```shell script
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$ jj rebase -r 5548374c0794 -d cf49e6bec410
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Rebased 1 descendant commits
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$ jj rebase -s 5548374c0794 -d cf49e6bec410
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Rebased 2 commits
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$ jj l
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o 66274d5a7d2d 8e6178b84ffb martinvonz@google.com 2021-05-26 12:39:35.000 -07:00 conflict
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| C
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@ -330,8 +330,8 @@ o 661432c51c08 cf49e6bec410 martinvonz@google.com 2021-05-26 12:39:12.000 -07:00
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```
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There are several things worth noting here. First, the `jj rebase` command said
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"Rebased 1 descendant commits". That's because we asked it to rebase commit B2,
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but commit C was on top of it, so it rebased that commit as well. Second,
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"Rebased 2 commits". That's because we asked it to rebase commit B2 with the
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`-s` option, which also rebases descendants (commit C in this case). Second,
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because B2 modified the same file (and word) as B1, rebasing it resulted in
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conflicts, as the `jj l` output indicates. Third, the conflicts did not prevent
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the rebase from completing successfully, nor did it prevent C from getting
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@ -395,8 +395,8 @@ o 1e6dd15305a3 martinvonz@<hostname> 2021-05-26 12:52:39.374 -07:00 - 2021-05-26
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| check out commit 0c305a9e6b274bc09b2bca85635299dcfdc6811c
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| args: jj co 0c305a9e6b27
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o 401652a2f61e martinvonz@<hostname> 2021-05-26 12:44:51.872 -07:00 - 2021-05-26 12:44:51.882 -07:00
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| rebase commit de5690380f40f3f7fc6b7d66d43a4f68ee606228
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| args: jj rebase -r de5690380f40 -d 661432c51c08
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| rebase commit de5690380f40f3f7fc6b7d66d43a4f68ee606228 and descendants
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| args: jj rebase -s de5690380f40 -d 661432c51c08
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[many more lines]
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```
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@ -50,7 +50,7 @@ use jujutsu_lib::repo::{
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};
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use jujutsu_lib::revset::{RevsetError, RevsetExpression, RevsetParseError};
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use jujutsu_lib::revset_graph_iterator::RevsetGraphEdgeType;
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use jujutsu_lib::rewrite::{back_out_commit, merge_commit_trees, rebase_commit};
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use jujutsu_lib::rewrite::{back_out_commit, merge_commit_trees, rebase_commit, DescendantRebaser};
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use jujutsu_lib::settings::UserSettings;
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use jujutsu_lib::store::{CommitId, StoreError, Timestamp, TreeValue};
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use jujutsu_lib::store_wrapper::StoreWrapper;
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@ -868,7 +868,20 @@ fn get_app<'a, 'b>() -> App<'a, 'b> {
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.arg(message_arg());
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let rebase_command = SubCommand::with_name("rebase")
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.about("Move a commit to a different parent")
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.arg(rev_arg())
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.arg(
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Arg::with_name("revision")
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.long("revision")
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.short("r")
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.takes_value(true),
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)
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.arg(
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Arg::with_name("source")
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.long("source")
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.short("s")
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.takes_value(true)
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.required(false)
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.multiple(false),
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)
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.arg(
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Arg::with_name("destination")
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.long("destination")
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@ -2229,18 +2242,61 @@ fn cmd_rebase(
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command: &CommandHelper,
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sub_matches: &ArgMatches,
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) -> Result<(), CommandError> {
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let mut repo_command = command.repo_helper(ui)?;
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let commit_to_rebase = repo_command.resolve_revision_arg(ui, sub_matches)?;
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repo_command.check_rewriteable(&commit_to_rebase)?;
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let mut repo_command = command.repo_helper(ui)?.evolve_orphans(false);
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let mut parents = vec![];
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for revision_str in sub_matches.values_of("destination").unwrap() {
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let destination = repo_command.resolve_single_rev(ui, revision_str)?;
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parents.push(destination);
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}
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let mut tx =
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repo_command.start_transaction(&format!("rebase commit {}", commit_to_rebase.id().hex()));
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rebase_commit(ui.settings(), tx.mut_repo(), &commit_to_rebase, &parents);
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repo_command.finish_transaction(ui, tx)?;
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// TODO: Unless we want to allow both --revision and --source, is it better to
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// replace --source by --rebase-descendants?
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if sub_matches.is_present("revision") && sub_matches.is_present("source") {
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return Err(CommandError::UserError(String::from(
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"--revision cannot be used with --source",
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)));
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}
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if let Some(source_str) = sub_matches.value_of("source") {
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let old_commit = repo_command.resolve_single_rev(ui, source_str)?;
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let mut tx = repo_command.start_transaction(&format!(
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"rebase commit {} and descendants",
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old_commit.id().hex()
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));
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repo_command.check_rewriteable(&old_commit)?;
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let new_commit = rebase_commit(ui.settings(), tx.mut_repo(), &old_commit, &parents);
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let mut rebaser = DescendantRebaser::new(
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ui.settings(),
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tx.mut_repo(),
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old_commit.id().clone(),
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vec![new_commit.id().clone()],
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);
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rebaser.rebase_all();
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let num_rebased = rebaser.rebased().len() + 1;
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writeln!(ui, "Rebased {} commits", num_rebased)?;
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repo_command.finish_transaction(ui, tx)?;
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} else {
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let old_commit =
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repo_command.resolve_single_rev(ui, sub_matches.value_of("revision").unwrap_or("@"))?;
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let mut tx =
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repo_command.start_transaction(&format!("rebase commit {}", old_commit.id().hex()));
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repo_command.check_rewriteable(&old_commit)?;
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rebase_commit(ui.settings(), tx.mut_repo(), &old_commit, &parents);
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let mut rebaser = DescendantRebaser::new(
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ui.settings(),
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tx.mut_repo(),
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old_commit.id().clone(),
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old_commit.parent_ids(),
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);
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rebaser.rebase_all();
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let num_rebased = rebaser.rebased().len();
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if num_rebased != 0 {
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writeln!(
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ui,
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"Also rebased {} descendant commits onto parent of rebased commit",
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num_rebased
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)?;
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}
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repo_command.finish_transaction(ui, tx)?;
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}
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Ok(())
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}
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