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next/prev: update error message when no movement targets are found.
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If movement commands don't find a target commit, they fail. However,
it's usually not intuitive why they fail because in non-edit mode the
start commit is the parent of the working commit.

Adding the start commit change hash to the error message makes it easier
for the user to figure out what is going on.

Also, specifying 'No **other** descendant...' helps make it clear what
`jj` is really looking for.

Part of #3947
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@essiene
essiene committed Aug 25, 2024
1 parent 8d166c7 commit f9dc058
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Showing 2 changed files with 166 additions and 62 deletions.
132 changes: 92 additions & 40 deletions cli/src/movement_util.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -59,52 +59,89 @@ impl Direction {
}
}

fn target_not_found_message(&self, change_offset: u64) -> String {
match self {
Direction::Next => format!("No descendant found {} commit(s) forward", change_offset),
Direction::Prev => format!("No ancestor found {} commit(s) back", change_offset),
}
fn target_not_found_error(
&self,
workspace_command: &WorkspaceCommandHelper,
args: &MovementArgsInternal,
commits: &[Commit],
) -> CommandError {
let offset = args.offset;
let err_msg = match (self, args.should_edit, args.conflict) {
// in edit mode, start_revset is the WC, so we only look for direct descendants.
(Direction::Next, true, true) => {
String::from("The working copy has no descendants with conflicts")
}
(Direction::Next, true, false) => {
format!("No descendant found {offset} commit(s) forward from the working copy",)
}
// in non-edit mode, start_revset is the parent of WC, so we look for other descendants
// of start_revset.
(Direction::Next, false, true) => {
String::from("The working copy parent(s) have no other descendants with conflicts")
}
(Direction::Next, false, false) => format!(
"No other descendant found {offset} commit(s) forward from the working copy \
parent(s)",
),
// The WC can never be an ancestor of the start_revset since start_revset is either
// itself or it's parent.
(Direction::Prev, true, true) => {
String::from("The working copy has no ancestors with conflicts")
}
(Direction::Prev, true, false) => {
format!("No ancestor found {offset} commit(s) back from the working copy",)
}
(Direction::Prev, false, true) => {
String::from("The working copy parent(s) have no ancestors with conflicts")
}
(Direction::Prev, false, false) => format!(
"No ancestor found {offset} commit(s) back from the working copy parents(s)",
),
};

let template = workspace_command.commit_summary_template();
let mut cmd_err = user_error(err_msg);
commits.iter().for_each(|commit| {
cmd_err.add_formatted_hint_with(|formatter| {
if args.should_edit {
write!(formatter, "Working copy: ")?;
} else {
write!(formatter, "Working copy parent: ")?;
}
template.format(commit, formatter)
})
});

cmd_err
}

fn get_target_revset(
fn build_target_revset(
&self,
working_commit_id: &CommitId,
working_revset: &Rc<RevsetExpression>,
start_revset: &Rc<RevsetExpression>,
args: &MovementArgsInternal,
) -> Result<Rc<RevsetExpression>, CommandError> {
let wc_revset = RevsetExpression::commit(working_commit_id.clone());
// If we're editing, start at the working-copy commit. Otherwise, start from
// its direct parent(s).
let start_revset = if args.should_edit {
wc_revset.clone()
} else {
wc_revset.parents()
};

let target_revset = match self {
Direction::Next => if args.conflict {
let target_revset = match (self, args.conflict) {
(Direction::Next, true) => start_revset
.children()
.descendants()
.filtered(RevsetFilterPredicate::HasConflict)
.roots()
.minus(working_revset),
(Direction::Next, false) => start_revset
.descendants_at(args.offset)
.minus(working_revset),
(Direction::Prev, true) =>
// If people desire to move to the root conflict, replace the `heads()` below
// with `roots(). But let's wait for feedback.
{
start_revset
.children()
.descendants()
.parents()
.ancestors()
.filtered(RevsetFilterPredicate::HasConflict)
.roots()
} else {
start_revset.descendants_at(args.offset)
}
.minus(&wc_revset),

Direction::Prev => {
if args.conflict {
// If people desire to move to the root conflict, replace the `heads()` below
// with `roots(). But let's wait for feedback.
start_revset
.parents()
.ancestors()
.filtered(RevsetFilterPredicate::HasConflict)
.heads()
} else {
start_revset.ancestors_at(args.offset)
}
.heads()
}
(Direction::Prev, false) => start_revset.ancestors_at(args.offset),
};

Ok(target_revset)
Expand All @@ -118,7 +155,17 @@ fn get_target_commit(
working_commit_id: &CommitId,
args: &MovementArgsInternal,
) -> Result<Commit, CommandError> {
let target_revset = direction.get_target_revset(working_commit_id, args)?;
let wc_revset = RevsetExpression::commit(working_commit_id.clone());
// If we're editing, start at the working-copy commit. Otherwise, start from
// its direct parent(s).
let start_revset = if args.should_edit {
wc_revset.clone()
} else {
wc_revset.parents()
};

let target_revset = direction.build_target_revset(&wc_revset, &start_revset, args)?;

let targets: Vec<Commit> = target_revset
.evaluate_programmatic(workspace_command.repo().as_ref())?
.iter()
Expand All @@ -129,7 +176,12 @@ fn get_target_commit(
[target] => target,
[] => {
// We found no ancestor/descendant.
return Err(user_error(direction.target_not_found_message(args.offset)));
let start_commits: Vec<Commit> = start_revset
.evaluate_programmatic(workspace_command.repo().as_ref())?
.iter()
.commits(workspace_command.repo().store())
.try_collect()?;
return Err(direction.target_not_found_error(workspace_command, args, &start_commits));
}
commits => choose_commit(ui, workspace_command, direction, commits)?,
};
Expand Down
96 changes: 74 additions & 22 deletions cli/tests/test_next_prev_commands.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -203,7 +203,8 @@ fn test_next_exceeding_history() {
let stderr = test_env.jj_cmd_failure(&repo_path, &["next", "3"]);
// `jj next` beyond existing history fails.
insta::assert_snapshot!(stderr, @r###"
Error: No descendant found 3 commit(s) forward
Error: No other descendant found 3 commit(s) forward from the working copy parent(s)
Hint: Working copy parent: qpvuntsm fa15625b (empty) first
"###);
}

Expand Down Expand Up @@ -544,10 +545,12 @@ fn test_prev_prompts_on_multiple_parents() {
// Create a merge commit, which has two parents.
test_env.jj_cmd_ok(&repo_path, &["new", "all:@--+"]);
test_env.jj_cmd_ok(&repo_path, &["commit", "-m", "merge"]);
test_env.jj_cmd_ok(&repo_path, &["commit", "-m", "merge+1"]);

// Check that the graph looks the way we expect.
insta::assert_snapshot!(get_log_output(&test_env, &repo_path), @r###"
@ vruxwmqvtpmx
@ yostqsxwqrlt
○ vruxwmqvtpmx merge+1
○ yqosqzytrlsw merge
├─┬─╮
│ │ ○ qpvuntsmwlqt first
Expand All @@ -559,7 +562,7 @@ fn test_prev_prompts_on_multiple_parents() {
"###);

// Move @ backwards.
let (stdout, stderr) = test_env.jj_cmd_stdin_ok(&repo_path, &["prev"], "3\n");
let (stdout, stderr) = test_env.jj_cmd_stdin_ok(&repo_path, &["prev", "2"], "3\n");
insta::assert_snapshot!(stdout,@r###"
ambiguous prev commit, choose one to target:
1: mzvwutvl bc4f4fe3 (empty) third
Expand All @@ -569,9 +572,45 @@ fn test_prev_prompts_on_multiple_parents() {
enter the index of the commit you want to target:
"###);
insta::assert_snapshot!(stderr,@r###"
Working copy now at: znkkpsqq 07b409e8 (empty) (no description set)
Working copy now at: kpqxywon ddac00b0 (empty) (no description set)
Parent commit : qpvuntsm fa15625b (empty) first
"###);

insta::assert_snapshot!(get_log_output(&test_env, &repo_path), @r###"
@ kpqxywonksrl
│ ○ vruxwmqvtpmx merge+1
│ ○ yqosqzytrlsw merge
╭─┼─╮
○ │ │ qpvuntsmwlqt first
│ │ ○ kkmpptxzrspx second
├───╯
│ ○ mzvwutvlkqwt third
├─╯
◆ zzzzzzzzzzzz
"###);

test_env.jj_cmd_ok(&repo_path, &["next"]);
test_env.jj_cmd_ok(&repo_path, &["edit", "@-"]);

insta::assert_snapshot!(get_log_output(&test_env, &repo_path), @r###"
○ vruxwmqvtpmx merge+1
@ yqosqzytrlsw merge
├─┬─╮
│ │ ○ qpvuntsmwlqt first
│ ○ │ kkmpptxzrspx second
│ ├─╯
○ │ mzvwutvlkqwt third
├─╯
◆ zzzzzzzzzzzz
"###);

let stderr = test_env.jj_cmd_failure(&repo_path, &["next", "--no-edit"]);
insta::assert_snapshot!(stderr,@r###"
Error: No other descendant found 1 commit(s) forward from the working copy parent(s)
Hint: Working copy parent: mzvwutvl bc4f4fe3 (empty) third
Hint: Working copy parent: kkmpptxz b0d21db3 (empty) second
Hint: Working copy parent: qpvuntsm fa15625b (empty) first
"###)
}

#[test]
Expand All @@ -594,7 +633,8 @@ fn test_prev_beyond_root_fails() {
// @- is at "fourth", and there is no parent 5 commits behind it.
let stderr = test_env.jj_cmd_failure(&repo_path, &["prev", "5"]);
insta::assert_snapshot!(stderr,@r###"
Error: No ancestor found 5 commit(s) back
Error: No ancestor found 5 commit(s) back from the working copy parents(s)
Hint: Working copy parent: zsuskuln 9d7e5e99 (empty) fourth
"###);
}

Expand Down Expand Up @@ -826,14 +866,17 @@ fn test_next_conflict_head() {
@ rlvkpnrzqnoo conflict
◆ zzzzzzzzzzzz
"###);

let stderr = test_env.jj_cmd_failure(&repo_path, &["next", "--conflict"]);
insta::assert_snapshot!(stderr, @r###"
Error: No descendant found 1 commit(s) forward
Error: The working copy parent(s) have no other descendants with conflicts
Hint: Working copy parent: zzzzzzzz 00000000 (empty) (no description set)
"###);

let stderr = test_env.jj_cmd_failure(&repo_path, &["next", "--conflict", "--edit"]);
insta::assert_snapshot!(stderr, @r###"
Error: No descendant found 1 commit(s) forward
Error: The working copy has no descendants with conflicts
Hint: Working copy: rlvkpnrz da992bf2 (conflict) (no description set)
"###);
}

Expand Down Expand Up @@ -893,6 +936,11 @@ fn test_movement_edit_mode_true() {
◆ zzzzzzzzzzzz
"###);

let stderr = test_env.jj_cmd_failure(&repo_path, &["prev"]);
insta::assert_snapshot!(stderr, @r###"
Error: The root commit 000000000000 is immutable
"###);

let (stdout, stderr) = test_env.jj_cmd_ok(&repo_path, &["next"]);
insta::assert_snapshot!(stdout, @"");
insta::assert_snapshot!(stderr, @r###"
Expand Down Expand Up @@ -924,12 +972,12 @@ fn test_movement_edit_mode_true() {
let (stdout, stderr) = test_env.jj_cmd_ok(&repo_path, &["prev", "--no-edit"]);
insta::assert_snapshot!(stdout, @"");
insta::assert_snapshot!(stderr, @r###"
Working copy now at: nkmrtpmo 67a001a6 (empty) (no description set)
Working copy now at: uyznsvlq 7ad57fb8 (empty) (no description set)
Parent commit : qpvuntsm fa15625b (empty) first
"###);

insta::assert_snapshot!(get_log_output(&test_env, &repo_path), @r###"
@ nkmrtpmomlro
@ uyznsvlquzzm
│ ○ kkmpptxzrspx third
│ ○ rlvkpnrzqnoo second
├─╯
Expand All @@ -940,18 +988,24 @@ fn test_movement_edit_mode_true() {
let (stdout, stderr) = test_env.jj_cmd_ok(&repo_path, &["next", "--no-edit"]);
insta::assert_snapshot!(stdout, @"");
insta::assert_snapshot!(stderr, @r###"
Working copy now at: xznxytkn 22287813 (empty) (no description set)
Working copy now at: xtnwkqum 7ac7a1c4 (empty) (no description set)
Parent commit : rlvkpnrz 9ed53a4a (empty) second
"###);

insta::assert_snapshot!(get_log_output(&test_env, &repo_path), @r###"
@ xznxytknoqwo
@ xtnwkqumpolk
│ ○ kkmpptxzrspx third
├─╯
○ rlvkpnrzqnoo second
○ qpvuntsmwlqt first
◆ zzzzzzzzzzzz
"###);

let stderr = test_env.jj_cmd_failure(&repo_path, &["next"]);
insta::assert_snapshot!(stderr, @r###"
Error: No descendant found 1 commit(s) forward from the working copy
Hint: Working copy: xtnwkqum 7ac7a1c4 (empty) (no description set)
"###);
}

#[test]
Expand Down Expand Up @@ -1000,15 +1054,21 @@ fn test_movement_edit_mode_false() {
◆ zzzzzzzzzzzz
"###);

let stderr = test_env.jj_cmd_failure(&repo_path, &["prev", "3"]);
insta::assert_snapshot!(stderr, @r###"
Error: No ancestor found 3 commit(s) back from the working copy parents(s)
Hint: Working copy parent: qpvuntsm fa15625b (empty) first
"###);

let (stdout, stderr) = test_env.jj_cmd_ok(&repo_path, &["next"]);
insta::assert_snapshot!(stdout, @"");
insta::assert_snapshot!(stderr, @r###"
Working copy now at: znkkpsqq a8419fd6 (empty) (no description set)
Working copy now at: kpqxywon d06750fb (empty) (no description set)
Parent commit : rlvkpnrz 9ed53a4a (empty) second
"###);

insta::assert_snapshot!(get_log_output(&test_env, &repo_path), @r###"
@ znkkpsqqskkl
@ kpqxywonksrl
│ ○ kkmpptxzrspx third
├─╯
○ rlvkpnrzqnoo second
Expand All @@ -1019,18 +1079,10 @@ fn test_movement_edit_mode_false() {
let (stdout, stderr) = test_env.jj_cmd_ok(&repo_path, &["next", "--no-edit"]);
insta::assert_snapshot!(stdout, @"");
insta::assert_snapshot!(stderr, @r###"
Working copy now at: kmkuslsw 8c4d85ef (empty) (no description set)
Working copy now at: wqnwkozp 10fa181f (empty) (no description set)
Parent commit : kkmpptxz 30056b0c (empty) third
"###);

insta::assert_snapshot!(get_log_output(&test_env, &repo_path), @r###"
@ kmkuslswpqwq
○ kkmpptxzrspx third
○ rlvkpnrzqnoo second
○ qpvuntsmwlqt first
◆ zzzzzzzzzzzz
"###);

let (stdout, stderr) = test_env.jj_cmd_ok(&repo_path, &["prev", "--edit", "2"]);
insta::assert_snapshot!(stdout, @"");
insta::assert_snapshot!(stderr, @r###"
Expand Down

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