feat: support basic file presenting

frontend/src/core/messages/utils.ts

@@ -46,9 +46,14 @@ export function groupMessages<T>(
           messageIndex === messages.length - 1 &&
           isLoading)
       ) {
-        // Assistant messages without any content are folded into the previous group
-        // Normally, these are tool calls (with or without thinking)
-        currentGroup.push(message);
+        if (message.tool_calls?.[0]?.name === "present_files") {
+          yieldCurrentGroup();
+          currentGroup.push(message);
+        } else {
+          // Assistant messages without any content are folded into the previous group
+          // Normally, these are tool calls (with or without thinking)
+          currentGroup.push(message);
+        }
       } else {
         // Assistant messages with content (text or images) are shown as a group if they have content
         // No matter whether it has tool calls or not
@@ -144,6 +149,25 @@ export function hasToolCalls(message: Message) {
   );
 }
 
+export function hasPresentFiles(message: Message) {
+  return (
+    message.type === "ai" && message.tool_calls?.[0]?.name === "present_files"
+  );
+}
+
+export function extractPresentFilesFromMessage(message: Message) {
+  if (message.type !== "ai" || !hasPresentFiles(message)) {
+    return [];
+  }
+  const files = [];
+  for (const toolCall of message.tool_calls ?? []) {
+    if (toolCall.name === "present_files") {
+      files.push(...(toolCall.args.filepaths as string[]));
+    }
+  }
+  return files;
+}
+
 export function findToolCallResult(toolCallId: string, messages: Message[]) {
   for (const message of messages) {
     if (message.type === "tool" && message.tool_call_id === toolCallId) {

frontend/src/core/utils/files.ts

@@ -0,0 +1,25 @@
+export function getFileName(filepath: string) {
+  return filepath.split("/").pop()!;
+}
+
+export function getFileExtension(filepath: string) {
+  const fileName = getFileName(filepath);
+  const extension = fileName.split(".").pop()!.toLocaleLowerCase();
+  switch (extension) {
+    case "doc":
+    case "docx":
+      return "Word";
+    case "md":
+      return "Markdown";
+    case "txt":
+      return "Text";
+    case "ppt":
+    case "pptx":
+      return "PowerPoint";
+    case "xls":
+    case "xlsx":
+      return "Excel";
+    default:
+      return extension.toUpperCase();
+  }
+}