cli: split single revset resolution hint to paragraphs

Perhaps, this makes it slightly easier to spot the last "Hint:" line. We can
also render "Error:" and "Hint:" prefixes in different color/style.

cli/src/cli_util.rs

@@ -789,6 +789,9 @@ impl WorkspaceCommandHelper {
                 r#"Revset "{revision_str}" didn't resolve to any revisions"#
             ))),
             (Some(commit0), Some(commit1)) => {
+                let mut cmd_err = user_error(format!(
+                    r#"Revset "{revision_str}" resolved to more than one revision"#
+                ));
                 let mut iter = [commit0, commit1].into_iter().chain(iter);
                 let commits: Vec<_> = iter.by_ref().take(5).try_collect()?;
                 let elided = iter.next().is_some();
@@ -797,40 +800,41 @@ impl WorkspaceCommandHelper {
                     .map(|c| self.format_commit_summary(c))
                     .join("\n")
                     + elided.then_some("\n...").unwrap_or_default();
-                let hint = if commits[0].change_id() == commits[1].change_id() {
+                if commits[0].change_id() == commits[1].change_id() {
                     // Separate hint if there's commits with same change id
-                    format!(
+                    cmd_err.add_hint(format!(
                         r#"The revset "{revision_str}" resolved to these revisions:
-{commits_summary}
-Some of these commits have the same change id. Abandon one of them with `jj abandon -r <REVISION>`."#,
-                    )
+{commits_summary}"#
+                    ));
+                    cmd_err.add_hint(
+                        "Some of these commits have the same change id. Abandon one of them with \
+                         `jj abandon -r <REVISION>`.",
+                    );
                 } else if let RevsetExpression::CommitRef(RevsetCommitRef::Symbol(branch_name)) =
                     revset_expression.as_ref()
                 {
                     // Separate hint if there's a conflicted branch
-                    format!(
+                    cmd_err.add_hint(format!(
                         r#"Branch {branch_name} resolved to multiple revisions because it's conflicted.
 It resolved to these revisions:
-{commits_summary}
-Set which revision the branch points to with `jj branch set {branch_name} -r <REVISION>`."#,
-                    )
+{commits_summary}"#));
+                    cmd_err.add_hint(format!(
+                        "Set which revision the branch points to with `jj branch set \
+                         {branch_name} -r <REVISION>`.",
+                    ));
                 } else {
-                    let mut hint = format!(
+                    cmd_err.add_hint(format!(
                         r#"The revset "{revision_str}" resolved to these revisions:
 {commits_summary}"#,
-                    );
+                    ));
                     if should_hint_about_all_prefix {
-                        hint.push_str(&format!(
-                            "\nPrefix the expression with 'all:' to allow any number of revisions \
+                        cmd_err.add_hint(format!(
+                            "Prefix the expression with 'all:' to allow any number of revisions \
                              (i.e. 'all:{revision_str}')."
                         ));
                     }
-                    hint
                 };
-                Err(user_error_with_hint(
-                    format!(r#"Revset "{revision_str}" resolved to more than one revision"#),
-                    hint,
-                ))
+                Err(cmd_err)
             }
         }
     }

cli/tests/test_new_command.rs

@@ -497,7 +497,7 @@ fn test_new_conflicting_branches() {
     It resolved to these revisions:
     kkmpptxz 66c6502d foo?? | (empty) two
     qpvuntsm a9330854 foo?? | (empty) one
-    Set which revision the branch points to with `jj branch set foo -r <REVISION>`.
+    Hint: Set which revision the branch points to with `jj branch set foo -r <REVISION>`.
     "###);
 }
 
@@ -519,7 +519,7 @@ fn test_new_conflicting_change_ids() {
     Hint: The revset "qpvuntsm" resolved to these revisions:
     qpvuntsm?? d2ae6806 (empty) two
     qpvuntsm?? a9330854 (empty) one
-    Some of these commits have the same change id. Abandon one of them with `jj abandon -r <REVISION>`.
+    Hint: Some of these commits have the same change id. Abandon one of them with `jj abandon -r <REVISION>`.
     "###);
 }
 

cli/tests/test_rebase_command.rs

@@ -169,7 +169,7 @@ fn test_rebase_branch() {
     Hint: The revset "e|d" resolved to these revisions:
     znkkpsqq e52756c8 e | e
     vruxwmqv 514fa6b2 d | d
-    Prefix the expression with 'all:' to allow any number of revisions (i.e. 'all:e|d').
+    Hint: Prefix the expression with 'all:' to allow any number of revisions (i.e. 'all:e|d').
     "###);
     let (stdout, stderr) = test_env.jj_cmd_ok(&repo_path, &["rebase", "-b=all:e|d", "-d=b"]);
     insta::assert_snapshot!(stdout, @"");
@@ -480,7 +480,7 @@ fn test_rebase_multiple_destinations() {
     Hint: The revset "b|c" resolved to these revisions:
     royxmykx fe2e8e8b c | c
     zsuskuln d370aee1 b | b
-    Prefix the expression with 'all:' to allow any number of revisions (i.e. 'all:b|c').
+    Hint: Prefix the expression with 'all:' to allow any number of revisions (i.e. 'all:b|c').
     "###);
     let (stdout, stderr) = test_env.jj_cmd_ok(&repo_path, &["rebase", "-r", "a", "-d", "all:b|c"]);
     insta::assert_snapshot!(stdout, @"");
@@ -616,7 +616,7 @@ fn test_rebase_with_descendants() {
     Hint: The revset "b|d" resolved to these revisions:
     vruxwmqv df54a9fd d | d
     zsuskuln d370aee1 b | b
-    Prefix the expression with 'all:' to allow any number of revisions (i.e. 'all:b|d').
+    Hint: Prefix the expression with 'all:' to allow any number of revisions (i.e. 'all:b|d').
     "###);
     let (stdout, stderr) = test_env.jj_cmd_ok(&repo_path, &["rebase", "-s=all:b|d", "-d=a"]);
     insta::assert_snapshot!(stdout, @"");