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/**
* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import { PartListUnion } from '@google/genai';
import { Config, getErrorMessage } from '@gemini-code/server';
import {
HistoryItem,
IndividualToolCallDisplay,
ToolCallStatus,
} from '../types.js';
// Helper function to add history items (could be moved to a shared util if needed elsewhere)
const addHistoryItem = (
setHistory: React.Dispatch<React.SetStateAction<HistoryItem[]>>,
itemData: Omit<HistoryItem, 'id'>,
id: number,
) => {
setHistory((prevHistory) => [
...prevHistory,
{ ...itemData, id } as HistoryItem,
]);
};
interface HandleAtCommandParams {
query: string; // Raw user input
config: Config;
setHistory: React.Dispatch<React.SetStateAction<HistoryItem[]>>;
setDebugMessage: React.Dispatch<React.SetStateAction<string>>;
getNextMessageId: (baseTimestamp: number) => number;
userMessageTimestamp: number;
}
interface HandleAtCommandResult {
processedQuery: PartListUnion; // Query to potentially send to Gemini
shouldProceed: boolean; // Whether the main hook should continue processing
}
/**
* Processes user input that might start with the '@' command to read files/directories.
* If it's an '@' command, it attempts to read the specified path, updates the UI
* with the tool call status, and prepares the query to be sent to the LLM.
*
* @returns An object containing the potentially modified query and a flag
* indicating if the main hook should proceed with the Gemini API call.
*/
export async function handleAtCommand({
query,
config,
setHistory,
setDebugMessage,
getNextMessageId,
userMessageTimestamp,
}: HandleAtCommandParams): Promise<HandleAtCommandResult> {
const trimmedQuery = query.trim();
if (!trimmedQuery.startsWith('@')) {
// Not an '@' command, proceed as normal
// Add the user message here before returning
addHistoryItem(
setHistory,
{ type: 'user', text: query },
userMessageTimestamp,
);
// Use property shorthand for processedQuery
return { processedQuery: query, shouldProceed: true };
}
// --- It is an '@' command ---
const filePath = trimmedQuery.substring(1);
if (!filePath) {
// Handle case where it's just "@" - treat as normal input
addHistoryItem(
setHistory,
{ type: 'user', text: query },
userMessageTimestamp,
);
// Use property shorthand for processedQuery
return { processedQuery: query, shouldProceed: true }; // Send the "@" to the model
}
const toolRegistry = config.getToolRegistry();
const readManyFilesTool = toolRegistry.getTool('read_many_files');
// Add user message first, so it appears before potential errors/tool UI
addHistoryItem(
setHistory,
{ type: 'user', text: query },
userMessageTimestamp,
);
if (!readManyFilesTool) {
const errorTimestamp = getNextMessageId(userMessageTimestamp);
addHistoryItem(
setHistory,
{ type: 'error', text: 'Error: read_many_files tool not found.' },
errorTimestamp,
);
// Use property shorthand for processedQuery
return { processedQuery: query, shouldProceed: false }; // Don't proceed if tool is missing
}
// --- Path Handling for @ command ---
let pathSpec = filePath;
// Basic check: If no extension or ends with '/', assume directory and add globstar.
if (!filePath.includes('.') || filePath.endsWith('/')) {
pathSpec = filePath.endsWith('/') ? `${filePath}**` : `${filePath}/**`;
}
const toolArgs = { paths: [pathSpec] };
const contentLabel =
pathSpec === filePath ? filePath : `directory ${filePath}`; // Adjust label
// --- End Path Handling ---
let toolCallDisplay: IndividualToolCallDisplay;
let processedQuery: PartListUnion = query; // Default to original query
try {
setDebugMessage(`Reading via @ command: ${pathSpec}`);
const result = await readManyFilesTool.execute(toolArgs);
const fileContent = result.llmContent || '';
// Construct success UI
toolCallDisplay = {
callId: `client-read-${userMessageTimestamp}`,
name: readManyFilesTool.displayName,
description: readManyFilesTool.getDescription(toolArgs),
status: ToolCallStatus.Success,
resultDisplay: result.returnDisplay,
confirmationDetails: undefined,
};
// Prepend file content to the query sent to the model
processedQuery = [
{
text: `--- Content from: ${contentLabel} ---
${fileContent}
--- End Content ---`,
},
// TODO: Handle cases like "@README.md explain this" by appending the rest of the query
];
// Add the tool group UI
const toolGroupId = getNextMessageId(userMessageTimestamp);
addHistoryItem(
setHistory,
{ type: 'tool_group', tools: [toolCallDisplay] } as Omit<
HistoryItem,
'id'
>,
toolGroupId,
);
// Use property shorthand for processedQuery
return { processedQuery, shouldProceed: true }; // Proceed to Gemini
} catch (error) {
// Construct error UI
toolCallDisplay = {
callId: `client-read-${userMessageTimestamp}`,
name: readManyFilesTool.displayName,
description: readManyFilesTool.getDescription(toolArgs),
status: ToolCallStatus.Error,
resultDisplay: `Error reading ${contentLabel}: ${getErrorMessage(error)}`,
confirmationDetails: undefined,
};
// Add the tool group UI and signal not to proceed
const toolGroupId = getNextMessageId(userMessageTimestamp);
addHistoryItem(
setHistory,
{ type: 'tool_group', tools: [toolCallDisplay] } as Omit<
HistoryItem,
'id'
>,
toolGroupId,
);
// Use property shorthand for processedQuery
return { processedQuery: query, shouldProceed: false }; // Don't proceed on error
}
}
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