meal filtering feature

src/http.rs

@@ -340,6 +340,7 @@ struct AddMealForm {
 #[derive(Debug, Deserialize)]
 struct MealPickerQuery {
     picker: Option<i64>,
+    q: Option<String>,
 }
 
 async fn home() -> Redirect {
@@ -897,15 +898,50 @@ async fn meals_page(
     State(state): State<AppState>,
     user: CurrentUser,
     Query(query): Query<MealPickerQuery>,
+    headers: HeaderMap,
 ) -> Result<Response, AppError> {
-    let meals = state.meals.list_meals().await?;
+    let q = query.q.clone().unwrap_or_default();
+    let meals = state.meals.list_meals(&q).await?;
     let meal_categories = state.meals.list_meal_categories().await?;
+    let is_htmx = headers
+        .get("hx-request")
+        .and_then(|value| value.to_str().ok())
+        .is_some_and(|value| value == "true");
+    // A boosted navigation (e.g. the category form's POST redirect) also sends
+    // `HX-Request: true`, but must render the full page, not just the results
+    // fragment. Only a live search (an `hx-get` on the filter box) swaps the
+    // fragment. htmx marks boosted requests with `HX-Boosted: true`.
+    let is_boosted = headers
+        .get("hx-boosted")
+        .and_then(|value| value.to_str().ok())
+        .is_some_and(|value| value == "true");
     if let Some(list_id) = query.picker {
-        return Ok(html_response(views::meal_picker(
+        if query.q.is_some() {
+            // Live search inside the picker: swap only the grouped rows, keeping
+            // the modal and search box focused. The initial picker load has no
+            // `q`, so it falls through to the full modal below.
+            return Ok(html_response(views::meal_picker_results(
+                &meals,
+                &meal_categories,
+                list_id,
+                &user.session.csrf_token,
+            )));
+        }
+        let picker = views::meal_picker(
             &meals,
             &meal_categories,
             list_id,
             &user.session.csrf_token,
+            &q,
+        );
+        return Ok(html_response(picker));
+    }
+    if is_htmx && !is_boosted {
+        // Live search on the meals page: swap only the grouped results.
+        return Ok(html_response(views::meal_results(
+            &meals,
+            &meal_categories,
+            &q,
         )));
     }
     Ok(html_response(views::meals_page(
@@ -913,6 +949,7 @@ async fn meals_page(
         &meals,
         &meal_categories,
         &user.session.csrf_token,
+        &q,
     )))
 }