feat: Try SQLite FTS5 (#5052)

src/context.rs

@@ -1099,12 +1099,14 @@ impl Context {
                 .query_map(
                     "SELECT m.id AS id
                  FROM msgs m
+                 INNER JOIN msgs_search ms
+                        ON m.id=ms.rowid
                  LEFT JOIN contacts ct
                         ON m.from_id=ct.id
                  WHERE m.chat_id=?
                    AND m.hidden=0
                    AND ct.blocked=0
-                   AND txt LIKE ?
+                   AND ms.txt LIKE ?
                  ORDER BY m.timestamp,m.id;",
                     (chat_id, str_like_in_text),
                     |row| row.get::<_, MsgId>("id"),
@@ -1132,6 +1134,8 @@ impl Context {
                 .query_map(
                     "SELECT m.id AS id
                  FROM msgs m
+                 INNER JOIN msgs_search ms
+                        ON m.id=ms.rowid
                  LEFT JOIN contacts ct
                         ON m.from_id=ct.id
                  LEFT JOIN chats c
@@ -1140,7 +1144,7 @@ impl Context {
                    AND m.hidden=0
                    AND c.blocked!=1
                    AND ct.blocked=0
-                   AND m.txt LIKE ?
+                   AND ms.txt LIKE ?
                  ORDER BY m.id DESC LIMIT 1000",
                     (str_like_in_text,),
                     |row| row.get::<_, MsgId>("id"),
@@ -1537,6 +1541,8 @@ mod tests {
         msg2.set_text("barbaz".to_string());
         send_msg(&alice, chat.id, &mut msg2).await?;
 
+        alice.send_text(chat.id, "Δ-Chat").await;
+
         // Global search with a part of text finds the message.
         let res = alice.search_msgs(None, "ob").await?;
         assert_eq!(res.len(), 1);
@@ -1549,6 +1555,12 @@ mod tests {
         assert_eq!(res.first(), Some(&msg2.id));
         assert_eq!(res.get(1), Some(&msg1.id));
 
+        // Search is case-insensitive.
+        for chat_id in [None, Some(chat.id)] {
+            let res = alice.search_msgs(chat_id, "δ-chat").await?;
+            assert_eq!(res.len(), 1);
+        }
+
         // Global search with longer text does not find any message.
         let res = alice.search_msgs(None, "foobarbaz").await?;
         assert!(res.is_empty());

src/sql/migrations.rs

@@ -911,6 +911,24 @@ CREATE INDEX msgs_status_updates_index2 ON msgs_status_updates (uid);
         .await?;
     }
 
+    if dbversion < 111 {
+        sql.execute_migration(
+            "CREATE VIRTUAL TABLE msgs_search USING fts5(txt, content='msgs', content_rowid='id'); \
+            CREATE TRIGGER msgs_search_insert AFTER INSERT ON msgs BEGIN \
+              INSERT INTO msgs_search (rowid, txt) VALUES (new.id, new.txt); \
+            END; \
+            CREATE TRIGGER msgs_search_delete AFTER DELETE ON msgs BEGIN \
+              INSERT INTO msgs_search (msgs_search, rowid, txt) VALUES ('delete', old.id, old.txt); \
+            END; \
+            CREATE TRIGGER msgs_search_update AFTER UPDATE ON msgs BEGIN \
+              INSERT INTO msgs_search (msgs_search, rowid, txt) VALUES ('delete', old.id, old.txt); \
+              INSERT INTO msgs_search (rowid, txt) VALUES (new.id, new.txt); \
+            END; \
+            INSERT INTO msgs_search (msgs_search) VALUES ('rebuild');",
+            111,
+        ).await?;
+    }
+
     let new_version = sql
         .get_raw_config_int(VERSION_CFG)
         .await?