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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 ignore, { type Ignore } from 'ignore';
import { isGitRepository } from './gitUtils.js';
export interface GitIgnoreFilter {
isIgnored(filePath: string): boolean;
}
export class GitIgnoreParser implements GitIgnoreFilter {
private projectRoot: string;
private isGitRepo: boolean = false;
private ig: Ignore = ignore();
constructor(projectRoot: string) {
this.projectRoot = path.resolve(projectRoot);
}
async initialize(): Promise<void> {
this.isGitRepo = isGitRepository(this.projectRoot);
if (this.isGitRepo) {
const gitIgnoreFiles = [
path.join(this.projectRoot, '.gitignore'),
path.join(this.projectRoot, '.git', 'info', 'exclude'),
];
// Always ignore .git directory regardless of .gitignore content
this.addPatterns(['.git']);
for (const gitIgnoreFile of gitIgnoreFiles) {
try {
const content = await fs.readFile(gitIgnoreFile, 'utf-8');
const patterns = content.split('\n').map((p) => p.trim());
this.addPatterns(patterns);
} catch (_error) {
// File doesn't exist or can't be read, continue silently
}
}
}
}
private addPatterns(patterns: string[]) {
this.ig.add(patterns);
}
isIgnored(filePath: string): boolean {
if (!this.isGitRepo) {
return false;
}
const relativePath = path.isAbsolute(filePath)
? path.relative(this.projectRoot, filePath)
: filePath;
if (relativePath === '' || relativePath.startsWith('..')) {
return false;
}
let normalizedPath = relativePath.replace(/\\/g, '/');
if (normalizedPath.startsWith('./')) {
normalizedPath = normalizedPath.substring(2);
}
const ignored = this.ig.ignores(normalizedPath);
return ignored;
}
getGitRepoRoot(): string {
return this.projectRoot;
}
}
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