Reopen the last project with a focused draft chat

src/database.rs

@@ -55,6 +55,8 @@ pub struct AppPreferences {
     pub endpoint_enabled: bool,
     pub endpoint_cors: bool,
     pub sidebar_collapsed: bool,
+    /// Project the app reopens on. Cleared when that project goes away.
+    pub last_project_id: Option<i32>,
 }
 
 impl Default for AppPreferences {
@@ -98,6 +100,7 @@ impl Default for AppPreferences {
             endpoint_enabled: true,
             endpoint_cors: false,
             sidebar_collapsed: false,
+            last_project_id: None,
         }
     }
 }
@@ -441,6 +444,14 @@ impl Database {
             .map_err(|error| error.to_string())
     }
 
+    pub fn set_last_project(&mut self, project_id: Option<i32>) -> Result<(), String> {
+        diesel::update(preferences::table.find(1))
+            .set(preferences::last_project_id.eq(project_id))
+            .execute(&mut self.connection)
+            .map(|_| ())
+            .map_err(|error| error.to_string())
+    }
+
     #[allow(clippy::too_many_arguments)]
     pub fn update_preferences(
         &mut self,
@@ -851,6 +862,7 @@ mod tests {
         assert_eq!(loaded[0].sessions[0].id, ordinary);
 
         database.set_sidebar_collapsed(true).unwrap();
+        database.set_last_project(Some(project.id)).unwrap();
 
         database.delete_project(project.id).unwrap();
         assert!(database.load_projects().unwrap().is_empty());
@@ -859,6 +871,7 @@ mod tests {
         let mut reopened = Database::open(&path).unwrap();
         let preferences = reopened.load_preferences().unwrap();
         assert!(preferences.sidebar_collapsed);
+        assert_eq!(preferences.last_project_id, Some(project.id));
         assert_eq!(preferences.selected_model, "glm-5.2");
         assert_eq!(preferences.idle_timeout_minutes, 30);
         assert_eq!(preferences.endpoint_port, 4567);