Optimization of tilde expansion (#9709)

* Use next and avoid a redundant prefix strip

* Avoid allocations

Especially when `expand_tilde` is claled on a path
that doesn't contain a tilde.

* Add a test

* Use Into<Cow<…>>

* Put the expand_tilde test at the end of the file

* Remove unused importsw

2 files changed, 9 insertions, 9 deletions

diff --git a/helix-term/src/commands/typed.rs b/helix-term/src/commands/typed.rs
index b7ceeba5..3d7ea3fc 100644
--- a/helix-term/src/commands/typed.rs
+++ b/helix-term/src/commands/typed.rs
@@ -110,14 +110,14 @@ fn open(cx: &mut compositor::Context, args: &[Cow<str>], event: PromptEvent) ->
     ensure!(!args.is_empty(), "wrong argument count");
     for arg in args {
         let (path, pos) = args::parse_file(arg);
-        let path = helix_stdx::path::expand_tilde(&path);
+        let path = helix_stdx::path::expand_tilde(path);
         // If the path is a directory, open a file picker on that directory and update the status
         // message
         if let Ok(true) = std::fs::canonicalize(&path).map(|p| p.is_dir()) {
             let callback = async move {
                 let call: job::Callback = job::Callback::EditorCompositor(Box::new(
                     move |editor: &mut Editor, compositor: &mut Compositor| {
-                        let picker = ui::file_picker(path, &editor.config());
+                        let picker = ui::file_picker(path.into_owned(), &editor.config());
                         compositor.push(Box::new(overlaid(picker)));
                     },
                 ));
@@ -1078,11 +1078,11 @@ fn change_current_directory(
         return Ok(());
     }
 
-    let dir = helix_stdx::path::expand_tilde(
-        args.first()
-            .context("target directory not provided")?
-            .as_ref(),
-    );
+    let dir = args
+        .first()
+        .context("target directory not provided")?
+        .as_ref();
+    let dir = helix_stdx::path::expand_tilde(Path::new(dir));
 
     helix_stdx::env::set_current_working_dir(dir)?;
 
diff --git a/helix-term/src/ui/mod.rs b/helix-term/src/ui/mod.rs
index d27e8355..0873116c 100644
--- a/helix-term/src/ui/mod.rs
+++ b/helix-term/src/ui/mod.rs
@@ -428,9 +428,9 @@ pub mod completers {
                 path
             } else {
                 match path.parent() {
-                    Some(path) if !path.as_os_str().is_empty() => path.to_path_buf(),
+                    Some(path) if !path.as_os_str().is_empty() => Cow::Borrowed(path),
                     // Path::new("h")'s parent is Some("")...
-                    _ => helix_stdx::env::current_working_dir(),
+                    _ => Cow::Owned(helix_stdx::env::current_working_dir()),
                 }
             };