consolidate shared helpers into utils crate

crates/workspace/src/views/pull_requests/new.rs

@@ -30,6 +30,7 @@ use signed_state::{
     Backend, CheckoutsStore, RepoListStore, RepoStore, ensure_repo_mirror, repo_mirror_path,
 };
 use signed_ui::{CountBadge, placeholder, ref_selector_trigger};
+use utils::middle_truncate;
 
 use crate::views::commit_diff::{COMMIT_ROW_HEIGHT, CommitDiffView, DiffPane, commit_row};
 use crate::views::{repo_tab_avatar, tab_title};
@@ -104,17 +105,8 @@ fn shorten_owner(owner: &PublicKey) -> String {
     hex.chars().take(10).collect()
 }
 
-/// Truncate a label for the fixed-width controls of the compare bar.
 fn truncate_label(label: &str) -> SharedString {
-    const MAX: usize = 18;
-    let mut chars = label.chars();
-    let (prefix, rest) = (chars.by_ref().take(MAX).collect::<String>(), chars.next());
-    let label = if rest.is_some() {
-        format!("{}…", &prefix[..prefix.len().saturating_sub(1)])
-    } else {
-        prefix
-    };
-    SharedString::from(label)
+    SharedString::from(middle_truncate(label, 18, 0))
 }
 
 fn checkout_source_item(