feat(search): search_objects returns highlighted hits + estimated total

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

crates/search/src/lib.rs

@@ -8,6 +8,7 @@
 
 use db::Db;
 use domain::{CatalogueObject, ObjectId};
+use meilisearch_sdk::search::Selectors;
 use meilisearch_sdk::tasks::Task;
 use serde::{Deserialize, Serialize};
 
@@ -39,6 +40,31 @@ pub struct SearchDocument {
     pub fields_text: Vec<String>,
 }
 
+/// Non-HTML highlight markers. These ASCII control characters cannot occur in
+/// catalogue text, so the frontend can safely split on them to render matches —
+/// no HTML ever crosses the API boundary.
+pub const HL_PRE: &str = "\u{2}";
+pub const HL_POST: &str = "\u{3}";
+
+/// One search result: display metadata projected from the index, plus an optional
+/// snippet of matched text with [`HL_PRE`]/[`HL_POST`] markers around the matches.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct SearchHit {
+    pub id: String,
+    pub object_number: String,
+    pub object_name: String,
+    pub brief_description: Option<String>,
+    pub visibility: String,
+    pub snippet: Option<String>,
+}
+
+/// A page of search results plus Meilisearch's estimate of the total match count.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct SearchResults {
+    pub hits: Vec<SearchHit>,
+    pub estimated_total: usize,
+}
+
 /// A Meilisearch-backed search client scoped to one index.
 #[derive(Clone)]
 pub struct SearchClient {
@@ -147,6 +173,63 @@ impl SearchClient {
             .collect()
     }
 
+    /// Full-text query returning display-ready hits with highlighted snippets and the
+    /// estimated total match count. `visibility`, when set, filters on the indexed
+    /// `visibility` attribute. Pagination is offset/limit.
+    pub async fn search_objects(
+        &self,
+        query: &str,
+        visibility: Option<&str>,
+        offset: usize,
+        limit: usize,
+    ) -> Result<SearchResults, SearchError> {
+        let index = self.client.index(&self.index_uid);
+
+        let filter = visibility.map(|v| format!("visibility = \"{v}\""));
+        let highlight: &[&str] = &["object_name", "brief_description", "fields_text"];
+        let crop: &[(&str, Option<usize>)] = &[("brief_description", None), ("fields_text", None)];
+
+        let mut search = index.search();
+        search
+            .with_query(query)
+            .with_offset(offset)
+            .with_limit(limit)
+            .with_attributes_to_highlight(Selectors::Some(highlight))
+            .with_attributes_to_crop(Selectors::Some(crop))
+            .with_crop_length(20)
+            .with_highlight_pre_tag(HL_PRE)
+            .with_highlight_post_tag(HL_POST);
+
+        if let Some(filter) = &filter {
+            search.with_filter(filter);
+        }
+
+        let results = search.execute::<SearchDocument>().await?;
+
+        let hits = results
+            .hits
+            .into_iter()
+            .map(|hit| {
+                let snippet = hit.formatted_result.as_ref().and_then(extract_snippet);
+                let doc = hit.result;
+
+                SearchHit {
+                    id: doc.id,
+                    object_number: doc.object_number,
+                    object_name: doc.object_name,
+                    brief_description: doc.brief_description,
+                    visibility: doc.visibility,
+                    snippet,
+                }
+            })
+            .collect();
+
+        Ok(SearchResults {
+            hits,
+            estimated_total: results.estimated_total_hits.unwrap_or(0),
+        })
+    }
+
     /// Sync a single object's index entry with the database after a catalogue write
     /// commits: re-project and index it if it still exists, otherwise remove it. This
     /// is the uniform on-write path for create/update/delete/field/visibility changes —
@@ -272,3 +355,38 @@ pub async fn build_document(
         fields_text,
     })
 }
+
+/// Pick the best snippet from Meilisearch's `_formatted` map: prefer a highlighted
+/// `brief_description`, then a highlighted `fields_text` entry, then `object_name`;
+/// fall back to an unhighlighted `brief_description` so a hit still shows context.
+fn extract_snippet(formatted: &serde_json::Map<String, serde_json::Value>) -> Option<String> {
+    let has_mark = |s: &str| s.contains(HL_PRE);
+
+    if let Some(serde_json::Value::String(s)) = formatted.get("brief_description") {
+        if has_mark(s) {
+            return Some(s.clone());
+        }
+    }
+
+    if let Some(serde_json::Value::Array(items)) = formatted.get("fields_text") {
+        for item in items {
+            if let Some(s) = item.as_str() {
+                if has_mark(s) {
+                    return Some(s.to_owned());
+                }
+            }
+        }
+    }
+
+    if let Some(serde_json::Value::String(s)) = formatted.get("object_name") {
+        if has_mark(s) {
+            return Some(s.clone());
+        }
+    }
+
+    if let Some(serde_json::Value::String(s)) = formatted.get("brief_description") {
+        return Some(s.clone());
+    }
+
+    None
+}