most recent used buffers picker

helix-term/src/commands.rs

@@ -2216,6 +2216,7 @@ fn buffer_picker(cx: &mut Context) {
         path: Option<PathBuf>,
         is_modified: bool,
         is_current: bool,
+        used_at: std::time::Instant,
     }
 
     impl ui::menu::Item for BufferMeta {
@@ -2253,14 +2254,21 @@ fn buffer_picker(cx: &mut Context) {
         path: doc.path().cloned(),
         is_modified: doc.is_modified(),
         is_current: doc.id() == current,
+        used_at: doc.used_at,
     };
 
+    let mut items = cx
+        .editor
+        .documents
+        .iter()
+        .map(|(_, doc)| new_meta(doc))
+        .collect::<Vec<BufferMeta>>();
+
+    // mru
+    items.sort_by(|a, b| b.used_at.cmp(&a.used_at));
+
     let picker = FilePicker::new(
-        cx.editor
-            .documents
-            .iter()
-            .map(|(_, doc)| new_meta(doc))
-            .collect(),
+        items,
         (),
         |cx, meta, action| {
             cx.editor.switch(meta.id, action);

helix-view/src/document.rs

@@ -121,6 +121,9 @@ pub struct Document {
 
     diagnostics: Vec<Diagnostic>,
     language_server: Option<Arc<helix_lsp::Client>>,
+
+    // when document was used for most-recent-used buffer picker
+    pub used_at: std::time::Instant,
 }
 
 use std::{fmt, mem};
@@ -361,6 +364,7 @@ impl Document {
             last_saved_revision: 0,
             modified_since_accessed: false,
             language_server: None,
+            used_at: std::time::Instant::now(),
         }
     }
 
@@ -664,6 +668,11 @@ impl Document {
         }
     }
 
+    /// Mark document as recent used for MRU sorting
+    pub fn mark_as_used(&mut self) {
+        self.used_at = std::time::Instant::now();
+    }
+
     /// Remove a view's selection from this document.
     pub fn remove_view(&mut self, view_id: ViewId) {
         self.selections.remove(&view_id);

helix-view/src/editor.rs

@@ -807,6 +807,7 @@ impl Editor {
 
         let doc = self.documents.get_mut(&doc_id).unwrap();
         doc.ensure_view_init(view.id);
+        doc.mark_as_used();
 
         // TODO: reuse align_view
         let pos = doc
@@ -878,6 +879,7 @@ impl Editor {
                 let view_id = view!(self).id;
                 let doc = self.documents.get_mut(&id).unwrap();
                 doc.ensure_view_init(view_id);
+                doc.mark_as_used();
                 return;
             }
             Action::HorizontalSplit | Action::VerticalSplit => {
@@ -899,6 +901,7 @@ impl Editor {
                 // initialize selection for view
                 let doc = self.documents.get_mut(&id).unwrap();
                 doc.ensure_view_init(view_id);
+                doc.mark_as_used();
             }
         }