Manage chat files: fragment search a.k.a. swoop

public/script.js

@@ -6199,7 +6199,29 @@ export async function displayPastChats() {
             const fileName = chat['file_name'];
             const chatContent = rawChats[fileName];
 
-            return chatContent && Object.values(chatContent).some(message => message?.mes?.toLowerCase()?.includes(searchQuery.toLowerCase()));
+            // // Uncomment this to return to old behavior (classical full-substring search).
+            // return chatContent && Object.values(chatContent).some(message => message?.mes?.toLowerCase()?.includes(searchQuery.toLowerCase()));
+
+            // Fragment search a.k.a. swoop (as in `helm-swoop` in the Helm package of Emacs).
+            // Split a `query` {string} into its fragments {string[]}.
+            function makeQueryFragments(query) {
+                let fragments = query.trim().split(/\s+/).map( function (str) { return str.trim(); } );
+                fragments = [...new Set(fragments)];  // uniques only
+                // fragments = fragments.filter( function(str) { return str.length >= 3; } );  // Helm does this, but perhaps better if we don't.
+                fragments = fragments.map( function (str) { return str.toLowerCase(); } );
+                return fragments;
+            }
+            // Check whether `text` {string} includes all of the `fragments` {string[]}.
+            function matchFragments(fragments, text) {
+                if (!text) {
+                    return false;
+                }
+                return fragments.every(function (item, idx, arr) { return text.includes(item); });
+            }
+            const fragments = makeQueryFragments(searchQuery);
+            // At least one chat message must match *all* the fragments.
+            // Currently, this doesn't match if the fragment matches are distributed across several chat messages.
+            return chatContent && Object.values(chatContent).some(message => matchFragments(fragments, message?.mes?.toLowerCase()));
         });
 
         console.debug(filteredData);