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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,
unescapePath,
} from '@gemini-code/server';
import {
HistoryItem,
IndividualToolCallDisplay,
ToolCallStatus,
} from '../types.js';
import { UseHistoryManagerReturn } from './useHistoryManager.js';
interface HandleAtCommandParams {
query: string;
config: Config;
addItem: UseHistoryManagerReturn['addItem'];
updateItem: UseHistoryManagerReturn['updateItem'];
setDebugMessage: React.Dispatch<React.SetStateAction<string>>;
messageId: number;
}
interface HandleAtCommandResult {
processedQuery: PartListUnion | null;
shouldProceed: boolean;
}
/**
* Parses a query string to find the first '@<path>' command,
* handling \ escaped spaces within the path.
*/
function parseAtCommand(
query: string,
): { textBefore: string; atPath: string; textAfter: string } | null {
let atIndex = -1;
for (let i = 0; i < query.length; i++) {
if (query[i] === '@' && (i === 0 || query[i - 1] !== '\\')) {
atIndex = i;
break;
}
}
if (atIndex === -1) {
return null;
}
const textBefore = query.substring(0, atIndex).trim();
let pathEndIndex = atIndex + 1;
let inEscape = false;
while (pathEndIndex < query.length) {
const char = query[pathEndIndex];
if (inEscape) {
inEscape = false;
} else if (char === '\\') {
inEscape = true;
} else if (/\s/.test(char)) {
break;
}
pathEndIndex++;
}
const rawAtPath = query.substring(atIndex, pathEndIndex);
const textAfter = query.substring(pathEndIndex).trim();
const atPath = unescapePath(rawAtPath);
return { textBefore, atPath, textAfter };
}
/**
* Processes user input potentially containing an '@<path>' command.
* If found, it attempts to read the specified file/directory using the
* 'read_many_files' tool, adds the user query and tool result/error to history,
* and prepares the content for the LLM.
*
* @returns An object indicating whether the main hook should proceed with an
* LLM call and the processed query parts (including file content).
*/
export async function handleAtCommand({
query,
config,
addItem: addItem,
setDebugMessage,
messageId: userMessageTimestamp,
}: HandleAtCommandParams): Promise<HandleAtCommandResult> {
const trimmedQuery = query.trim();
const parsedCommand = parseAtCommand(trimmedQuery);
// If no @ command, add user query normally and proceed to LLM
if (!parsedCommand) {
addItem({ type: 'user', text: query }, userMessageTimestamp);
return { processedQuery: [{ text: query }], shouldProceed: true };
}
const { textBefore, atPath, textAfter } = parsedCommand;
// Add the original user query to history first
addItem({ type: 'user', text: query }, userMessageTimestamp);
const pathPart = atPath.substring(1); // Remove leading '@'
if (!pathPart) {
addItem(
{ type: 'error', text: 'Error: No path specified after @.' },
userMessageTimestamp,
);
return { processedQuery: null, shouldProceed: false };
}
const toolRegistry = config.getToolRegistry();
const readManyFilesTool = toolRegistry.getTool('read_many_files');
if (!readManyFilesTool) {
addItem(
{ type: 'error', text: 'Error: read_many_files tool not found.' },
userMessageTimestamp,
);
return { processedQuery: null, shouldProceed: false };
}
// Determine path spec (file or directory glob)
let pathSpec = pathPart;
const contentLabel = pathPart;
try {
const absolutePath = path.resolve(config.getTargetDir(), pathPart);
const stats = await fs.stat(absolutePath);
if (stats.isDirectory()) {
pathSpec = pathPart.endsWith('/') ? `${pathPart}**` : `${pathPart}/**`;
setDebugMessage(`Path resolved to directory, using glob: ${pathSpec}`);
} else {
setDebugMessage(`Path resolved to file: ${pathSpec}`);
}
} catch (error) {
// If stat fails (e.g., not found), proceed with original path.
// The tool itself will handle the error during execution.
if (isNodeError(error) && error.code === 'ENOENT') {
setDebugMessage(`Path not found, proceeding with original: ${pathSpec}`);
} else {
console.error(`Error stating path ${pathPart}:`, error);
setDebugMessage(
`Error stating path, proceeding with original: ${pathSpec}`,
);
}
}
const toolArgs = { paths: [pathSpec] };
let toolCallDisplay: IndividualToolCallDisplay;
try {
const result = await readManyFilesTool.execute(toolArgs);
const fileContent = result.llmContent || '';
toolCallDisplay = {
callId: `client-read-${userMessageTimestamp}`,
name: readManyFilesTool.displayName,
description: readManyFilesTool.getDescription(toolArgs),
status: ToolCallStatus.Success,
resultDisplay: result.returnDisplay,
confirmationDetails: undefined,
};
// Prepare the query parts for the LLM
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 successful tool result to history
addItem(
{ type: 'tool_group', tools: [toolCallDisplay] } as Omit<
HistoryItem,
'id'
>,
userMessageTimestamp,
);
return { processedQuery, shouldProceed: true };
} catch (error) {
// Handle errors during tool execution
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 error tool result to history
addItem(
{ type: 'tool_group', tools: [toolCallDisplay] } as Omit<
HistoryItem,
'id'
>,
userMessageTimestamp,
);
return { processedQuery: null, shouldProceed: false };
}
}
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