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/**
* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import * as fs from 'fs/promises';
import * as path from 'path';
import { PartListUnion } from '@google/genai';
import { Config, getErrorMessage, isNodeError } from '@gemini-code/server';
import {
HistoryItem,
IndividualToolCallDisplay,
ToolCallStatus,
} from '../types.js';
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;
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;
shouldProceed: boolean;
}
/**
* Processes user input potentially containing an '@<path>' command.
* It finds the first '@<path>', checks if the path is a file or directory,
* prepares the appropriate path specification for the read_many_files tool,
* 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();
const atCommandRegex = /^(.*?)(@\S+)(.*)$/s;
const match = trimmedQuery.match(atCommandRegex);
if (!match) {
const errorTimestamp = getNextMessageId(userMessageTimestamp);
addHistoryItem(
setHistory,
{ type: 'error', text: 'Error: Could not parse @ command.' },
errorTimestamp,
);
return { processedQuery: null, shouldProceed: false };
}
const textBefore = match[1].trim();
const atPath = match[2];
const textAfter = match[3].trim();
const pathPart = atPath.substring(1);
addHistoryItem(
setHistory,
{ type: 'user', text: query },
userMessageTimestamp,
);
if (!pathPart) {
const errorTimestamp = getNextMessageId(userMessageTimestamp);
addHistoryItem(
setHistory,
{ type: 'error', text: 'Error: No path specified after @.' },
errorTimestamp,
);
return { processedQuery: null, shouldProceed: false };
}
const toolRegistry = config.getToolRegistry();
const readManyFilesTool = toolRegistry.getTool('read_many_files');
if (!readManyFilesTool) {
const errorTimestamp = getNextMessageId(userMessageTimestamp);
addHistoryItem(
setHistory,
{ type: 'error', text: 'Error: read_many_files tool not found.' },
errorTimestamp,
);
return { processedQuery: null, shouldProceed: false };
}
// --- Path Handling for @ command ---
let pathSpec = pathPart;
const contentLabel = pathPart;
try {
// Resolve the path relative to the target directory
const absolutePath = path.resolve(config.getTargetDir(), pathPart);
const stats = await fs.stat(absolutePath);
if (stats.isDirectory()) {
// If it's a directory, ensure it ends with a globstar for recursive read
pathSpec = pathPart.endsWith('/') ? `${pathPart}**` : `${pathPart}/**`;
setDebugMessage(`Path resolved to directory, using glob: ${pathSpec}`);
} else {
// It's a file, use the original pathPart as pathSpec
setDebugMessage(`Path resolved to file: ${pathSpec}`);
}
} catch (error) {
// If stat fails (e.g., file/dir not found), proceed with the original pathPart.
// The read_many_files tool will handle the error if it's invalid.
if (isNodeError(error) && error.code === 'ENOENT') {
setDebugMessage(`Path not found, proceeding with original: ${pathSpec}`);
} else {
// Log other stat errors but still proceed
console.error(`Error stating path ${pathPart}:`, error);
setDebugMessage(
`Error stating path, proceeding with original: ${pathSpec}`,
);
}
}
const toolArgs = { paths: [pathSpec] };
// --- End Path Handling ---
let toolCallDisplay: IndividualToolCallDisplay;
try {
const result = await readManyFilesTool.execute(toolArgs);
const fileContent = result.llmContent || '';
toolCallDisplay = {
callId: `client-read-${userMessageTimestamp}`,
name: readManyFilesTool.displayName,
description: readManyFilesTool.getDescription(toolArgs),
status: ToolCallStatus.Success,
resultDisplay: result.returnDisplay,
confirmationDetails: undefined,
};
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;
const toolGroupId = getNextMessageId(userMessageTimestamp);
addHistoryItem(
setHistory,
{ type: 'tool_group', tools: [toolCallDisplay] } as Omit<
HistoryItem,
'id'
>,
toolGroupId,
);
return { processedQuery, shouldProceed: true };
} catch (error) {
toolCallDisplay = {
callId: `client-read-${userMessageTimestamp}`,
name: readManyFilesTool.displayName,
description: readManyFilesTool.getDescription(toolArgs),
status: ToolCallStatus.Error,
resultDisplay: `Error reading ${contentLabel}: ${getErrorMessage(error)}`,
confirmationDetails: undefined,
};
const toolGroupId = getNextMessageId(userMessageTimestamp);
addHistoryItem(
setHistory,
{ type: 'tool_group', tools: [toolCallDisplay] } as Omit<
HistoryItem,
'id'
>,
toolGroupId,
);
return { processedQuery: null, shouldProceed: false };
}
}
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