Maintain recently opened files history

crates/project/src/project.rs

@@ -12,13 +12,14 @@ mod project_tests;
 use anyhow::{anyhow, Context, Result};
 use client::{proto, Client, TypedEnvelope, UserStore};
 use clock::ReplicaId;
-use collections::{hash_map, BTreeMap, HashMap, HashSet};
+use collections::{hash_map, BTreeMap, HashMap, HashSet, VecDeque};
 use copilot::Copilot;
 use futures::{
     channel::mpsc::{self, UnboundedReceiver},
     future::{try_join_all, Shared},
     AsyncWriteExt, Future, FutureExt, StreamExt, TryFutureExt,
 };
+use fuzzy::PathMatch;
 use gpui::{
     AnyModelHandle, AppContext, AsyncAppContext, BorrowAppContext, Entity, ModelContext,
     ModelHandle, Task, WeakModelHandle,
@@ -135,6 +136,7 @@ pub struct Project {
     _maintain_workspace_config: Task<()>,
     terminals: Terminals,
     copilot_enabled: bool,
+    search_panel_state: SearchPanelState,
 }
 
 struct LspBufferSnapshot {
@@ -388,6 +390,42 @@ impl FormatTrigger {
     }
 }
 
+const MAX_RECENT_SELECTIONS: usize = 20;
+
+#[derive(Debug, Default)]
+pub struct SearchPanelState {
+    recent_selections: VecDeque<PathMatch>,
+}
+
+impl SearchPanelState {
+    pub fn recent_selections(&self) -> impl Iterator<Item = &PathMatch> {
+        self.recent_selections.iter().rev()
+    }
+
+    pub fn add_selection(&mut self, mut new_selection: PathMatch) {
+        let old_len = self.recent_selections.len();
+
+        // remove `new_selection` element, if it's in the list
+        self.recent_selections.retain(|old_selection| {
+            old_selection.worktree_id != new_selection.worktree_id
+                || old_selection.path != new_selection.path
+        });
+        // if `new_selection` was not present and we're adding a new element,
+        // ensure we do not exceed max allowed elements
+        if self.recent_selections.len() == old_len {
+            if self.recent_selections.len() >= MAX_RECENT_SELECTIONS {
+                self.recent_selections.pop_front();
+            }
+        }
+
+        // do not highlight query matches in the selection
+        new_selection.positions.clear();
+        // always re-add the element even if it exists to the back
+        // this way, it gets to the top as the most recently selected element
+        self.recent_selections.push_back(new_selection);
+    }
+}
+
 impl Project {
     pub fn init_settings(cx: &mut AppContext) {
         settings::register::<ProjectSettings>(cx);
@@ -487,6 +525,7 @@ impl Project {
                     local_handles: Vec::new(),
                 },
                 copilot_enabled: Copilot::global(cx).is_some(),
+                search_panel_state: SearchPanelState::default(),
             }
         })
     }
@@ -577,6 +616,7 @@ impl Project {
                     local_handles: Vec::new(),
                 },
                 copilot_enabled: Copilot::global(cx).is_some(),
+                search_panel_state: SearchPanelState::default(),
             };
             for worktree in worktrees {
                 let _ = this.add_worktree(&worktree, cx);
@@ -6435,6 +6475,14 @@ impl Project {
             })
     }
 
+    pub fn search_panel_state(&self) -> &SearchPanelState {
+        &self.search_panel_state
+    }
+
+    pub fn update_search_panel_state(&mut self) -> &mut SearchPanelState {
+        &mut self.search_panel_state
+    }
+
     fn primary_language_servers_for_buffer(
         &self,
         buffer: &Buffer,