Accept 'IntoIterator<Item = T>' for Picker::new options

`Picker::new` loops through the input options to inject each of them, so
there's no need to collect into an intermediary Vec. This removes some
unnecessary collections. Also, pickers that start with no initial
options can now pass an empty slice instead of an empty Vec.

Co-authored-by: Luis Useche <useche@gmail.com>

helix-term/src/commands.rs

@@ -2404,7 +2404,7 @@ fn global_search(cx: &mut Context) {
     let picker = Picker::new(
         columns,
         1, // contents
-        vec![],
+        [],
         config,
         move |cx, FileResult { path, line_num, .. }, action| {
             let doc = match cx.editor.open(path, action) {
@@ -2991,16 +2991,12 @@ fn jumplist_picker(cx: &mut Context) {
     let picker = Picker::new(
         columns,
         1, // path
-        cx.editor
-            .tree
-            .views()
-            .flat_map(|(view, _)| {
-                view.jumps
-                    .iter()
-                    .rev()
-                    .map(|(doc_id, selection)| new_meta(view, *doc_id, selection.clone()))
-            })
-            .collect(),
+        cx.editor.tree.views().flat_map(|(view, _)| {
+            view.jumps
+                .iter()
+                .rev()
+                .map(|(doc_id, selection)| new_meta(view, *doc_id, selection.clone()))
+        }),
         (),
         |cx, meta, action| {
             cx.editor.switch(meta.id, action);
@@ -3077,7 +3073,7 @@ fn changed_file_picker(cx: &mut Context) {
     let picker = Picker::new(
         columns,
         1, // path
-        Vec::new(),
+        [],
         FileChangeData {
             cwd: cwd.clone(),
             style_untracked: added,
@@ -3124,14 +3120,15 @@ pub fn command_palette(cx: &mut Context) {
                 [&cx.editor.mode]
                 .reverse_map();
 
-            let mut commands: Vec<MappableCommand> = MappableCommand::STATIC_COMMAND_LIST.into();
-            commands.extend(typed::TYPABLE_COMMAND_LIST.iter().map(|cmd| {
-                MappableCommand::Typable {
-                    name: cmd.name.to_owned(),
-                    doc: cmd.doc.to_owned(),
-                    args: Vec::new(),
-                }
-            }));
+            let commands = MappableCommand::STATIC_COMMAND_LIST.iter().cloned().chain(
+                typed::TYPABLE_COMMAND_LIST
+                    .iter()
+                    .map(|cmd| MappableCommand::Typable {
+                        name: cmd.name.to_owned(),
+                        args: Vec::new(),
+                        doc: cmd.doc.to_owned(),
+                    }),
+            );
 
             let columns = vec![
                 ui::PickerColumn::new("name", |item, _| match item {

helix-term/src/commands/lsp.rs

@@ -501,7 +501,7 @@ pub fn workspace_symbol_picker(cx: &mut Context) {
     let picker = Picker::new(
         columns,
         1, // name column
-        vec![],
+        [],
         (),
         move |cx, item, action| {
             jump_to_location(

helix-term/src/ui/mod.rs

@@ -228,22 +228,16 @@ pub fn file_picker(root: PathBuf, config: &helix_view::editor::Config) -> FilePi
                 .into()
         },
     )];
-    let picker = Picker::new(
-        columns,
-        0,
-        Vec::new(),
-        root,
-        move |cx, path: &PathBuf, action| {
-            if let Err(e) = cx.editor.open(path, action) {
-                let err = if let Some(err) = e.source() {
-                    format!("{}", err)
-                } else {
-                    format!("unable to open \"{}\"", path.display())
-                };
-                cx.editor.set_error(err);
-            }
-        },
-    )
+    let picker = Picker::new(columns, 0, [], root, move |cx, path: &PathBuf, action| {
+        if let Err(e) = cx.editor.open(path, action) {
+            let err = if let Some(err) = e.source() {
+                format!("{}", err)
+            } else {
+                format!("unable to open \"{}\"", path.display())
+            };
+            cx.editor.set_error(err);
+        }
+    })
     .with_preview(|_editor, path| Some((path.as_path().into(), None)));
     let injector = picker.injector();
     let timeout = std::time::Instant::now() + std::time::Duration::from_millis(30);

helix-term/src/ui/picker.rs

@@ -298,7 +298,7 @@ impl<T: 'static + Send + Sync, D: 'static + Send + Sync> Picker<T, D> {
     pub fn new(
         columns: Vec<Column<T, D>>,
         primary_column: usize,
-        options: Vec<T>,
+        options: impl IntoIterator<Item = T>,
         editor_data: D,
         callback_fn: impl Fn(&mut Context, &T, Action) + 'static,
     ) -> Self {