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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
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, potentially containing '@'
config: Config;
setHistory: React.Dispatch<React.SetStateAction<HistoryItem[]>>;
setDebugMessage: React.Dispatch<React.SetStateAction<string>>;
getNextMessageId: (baseTimestamp: number) => number;
userMessageTimestamp: number;
}
interface HandleAtCommandResult {
processedQuery: PartListUnion | null; // Query for Gemini (null on error/no-proceed)
shouldProceed: boolean; // Whether the main hook should continue processing
}
/**
* Processes user input potentially containing an '@<path>' command.
* It finds the first '@<path>', reads the specified path, updates the UI,
* and prepares the query for the LLM, incorporating the file content
* and surrounding text.
*
* @returns An object containing the potentially modified query (or null)
* and a flag indicating if the main hook should proceed.
*/
export async function handleAtCommand({
query,
config,
setHistory,
setDebugMessage,
getNextMessageId,
userMessageTimestamp,
}: HandleAtCommandParams): Promise<HandleAtCommandResult> {
const trimmedQuery = query.trim();
// Regex to find the first occurrence of @ followed by non-whitespace chars
// It captures the text before, the @path itself (including @), and the text after.
const atCommandRegex = /^(.*?)(@\S+)(.*)$/s; // s flag for dot to match newline
const match = trimmedQuery.match(atCommandRegex);
if (!match) {
// This should technically not happen if isPotentiallyAtCommand was true,
// but handle defensively.
const errorTimestamp = getNextMessageId(userMessageTimestamp);
addHistoryItem(
setHistory,
{ type: 'error', text: 'Error: Could not parse @ command.' },
errorTimestamp,
);
return { processedQuery: null, shouldProceed: false };
}
const textBefore = match[1].trim();
const atPath = match[2]; // Includes the '@'
const textAfter = match[3].trim();
const pathPart = atPath.substring(1); // Remove the leading '@'
// Add user message for the full original @ command
addHistoryItem(
setHistory,
{ type: 'user', text: query }, // Use original full query for history
userMessageTimestamp,
);
if (!pathPart) {
// Handle case where it's just "@" or "@ " - treat as error/don't proceed
const errorTimestamp = getNextMessageId(userMessageTimestamp);
addHistoryItem(
setHistory,
{ type: 'error', text: 'Error: No path specified after @.' },
errorTimestamp,
);
return { processedQuery: null, shouldProceed: false };
}
const toolRegistry = config.getToolRegistry();
const readManyFilesTool = toolRegistry.getTool('read_many_files');
if (!readManyFilesTool) {
const errorTimestamp = getNextMessageId(userMessageTimestamp);
addHistoryItem(
setHistory,
{ type: 'error', text: 'Error: read_many_files tool not found.' },
errorTimestamp,
);
return { processedQuery: null, shouldProceed: false }; // Don't proceed if tool is missing
}
// --- Path Handling for @ command ---
let pathSpec = pathPart; // Use the extracted path part
// Basic check: If no extension or ends with '/', assume directory and add globstar.
if (!pathPart.includes('.') || pathPart.endsWith('/')) {
pathSpec = pathPart.endsWith('/') ? `${pathPart}**` : `${pathPart}/**`;
}
const toolArgs = { paths: [pathSpec] };
const contentLabel =
pathSpec === pathPart ? pathPart : `directory ${pathPart}`; // Adjust label
// --- End Path Handling ---
let toolCallDisplay: IndividualToolCallDisplay;
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,
};
// Construct the query for Gemini, combining parts
const processedQueryParts = [];
if (textBefore) {
processedQueryParts.push({ text: textBefore });
}
processedQueryParts.push({
text: `\n--- Content from: ${contentLabel} ---\n${fileContent}\n--- End Content ---`,
});
if (textAfter) {
processedQueryParts.push({ text: textAfter });
}
const processedQuery: PartListUnion = processedQueryParts;
// Add the tool group UI
const toolGroupId = getNextMessageId(userMessageTimestamp);
addHistoryItem(
setHistory,
{ type: 'tool_group', tools: [toolCallDisplay] } as Omit<
HistoryItem,
'id'
>,
toolGroupId,
);
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,
);
return { processedQuery: null, shouldProceed: false }; // Don't proceed on error
}
}
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