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/**
* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import * as fs from 'node:fs';
import * as path from 'node:path';
const GEMINI_IGNORE_FILE_NAME = '.geminiignore';
/**
* Loads and parses a .geminiignore file from the given workspace root.
* The .geminiignore file follows a format similar to .gitignore:
* - Each line specifies a glob pattern.
* - Lines are trimmed of leading and trailing whitespace.
* - Blank lines (after trimming) are ignored.
* - Lines starting with a pound sign (#) (after trimming) are treated as comments and ignored.
* - Patterns are case-sensitive and follow standard glob syntax.
* - If a # character appears elsewhere in a line (not at the start after trimming),
* it is considered part of the glob pattern.
*
* @param workspaceRoot The absolute path to the workspace root where the .geminiignore file is expected.
* @returns An array of glob patterns extracted from the .geminiignore file. Returns an empty array
* if the file does not exist or contains no valid patterns.
*/
export function loadGeminiIgnorePatterns(workspaceRoot: string): string[] {
const ignoreFilePath = path.join(workspaceRoot, GEMINI_IGNORE_FILE_NAME);
const patterns: string[] = [];
try {
const fileContent = fs.readFileSync(ignoreFilePath, 'utf-8');
const lines = fileContent.split(/\r?\n/);
for (const line of lines) {
const trimmedLine = line.trim();
if (trimmedLine && !trimmedLine.startsWith('#')) {
patterns.push(trimmedLine);
}
}
if (patterns.length > 0) {
console.log(
`[INFO] Loaded ${patterns.length} patterns from .geminiignore`,
);
}
} catch (error: unknown) {
if (
error instanceof Error &&
'code' in error &&
typeof error.code === 'string'
) {
if (error.code === 'ENOENT') {
// .geminiignore not found, which is fine.
} else {
// Other error reading the file (e.g., permissions)
console.warn(
`[WARN] Could not read .geminiignore file at ${ignoreFilePath}: ${error.message}`,
);
}
} else {
// For other types of errors, or if code is not available
console.warn(
`[WARN] An unexpected error occurred while trying to read ${ignoreFilePath}: ${String(error)}`,
);
}
}
return patterns;
}
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