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/**
* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import { MCPServerConfig } from '@gemini-cli/core';
import * as fs from 'fs';
import * as path from 'path';
import * as os from 'os';
export const EXTENSIONS_DIRECTORY_NAME = path.join('.gemini', 'extensions');
export const EXTENSIONS_CONFIG_FILENAME = 'gemini-extension.json';
export interface ExtensionConfig {
name: string;
version: string;
mcpServers?: Record<string, MCPServerConfig>;
contextFileName?: string;
}
export function loadExtensions(workspaceDir: string): ExtensionConfig[] {
const allExtensions = [
...loadExtensionsFromDir(workspaceDir),
...loadExtensionsFromDir(os.homedir()),
];
const uniqueExtensions: ExtensionConfig[] = [];
const seenNames = new Set<string>();
for (const extension of allExtensions) {
if (!seenNames.has(extension.name)) {
console.log(
`Loading extension: ${extension.name} (version: ${extension.version})`,
);
uniqueExtensions.push(extension);
seenNames.add(extension.name);
}
}
return uniqueExtensions;
}
function loadExtensionsFromDir(dir: string): ExtensionConfig[] {
const extensionsDir = path.join(dir, EXTENSIONS_DIRECTORY_NAME);
if (!fs.existsSync(extensionsDir)) {
return [];
}
const extensions: ExtensionConfig[] = [];
for (const subdir of fs.readdirSync(extensionsDir)) {
const extensionDir = path.join(extensionsDir, subdir);
if (!fs.statSync(extensionDir).isDirectory()) {
console.error(
`Warning: unexpected file ${extensionDir} in extensions directory.`,
);
continue;
}
const extensionPath = path.join(extensionDir, EXTENSIONS_CONFIG_FILENAME);
if (!fs.existsSync(extensionPath)) {
console.error(
`Warning: extension directory ${extensionDir} does not contain a config file ${extensionPath}.`,
);
continue;
}
try {
const fileContent = fs.readFileSync(extensionPath, 'utf-8');
const extensionConfig = JSON.parse(fileContent) as ExtensionConfig;
if (!extensionConfig.name || !extensionConfig.version) {
console.error(
`Invalid extension config in ${extensionPath}: missing name or version.`,
);
continue;
}
if (extensionConfig.contextFileName) {
const contextFilePath = path.join(
extensionDir,
extensionConfig.contextFileName,
);
if (fs.existsSync(contextFilePath)) {
extensionConfig.contextFileName = contextFilePath;
}
} else {
const contextFilePath = path.join(extensionDir, 'gemini.md');
if (fs.existsSync(contextFilePath)) {
extensionConfig.contextFileName = contextFilePath;
}
}
extensions.push(extensionConfig);
} catch (e) {
console.error(
`Failed to load extension config from ${extensionPath}:`,
e,
);
}
}
return extensions;
}
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