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/**
* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import * as fs from 'fs';
import * as path from 'path';
import ignore, { type Ignore } from 'ignore';
import { isGitRepository } from './gitUtils.js';
export interface GitIgnoreFilter {
isIgnored(filePath: string): boolean;
getPatterns(): string[];
}
export class GitIgnoreParser implements GitIgnoreFilter {
private projectRoot: string;
private ig: Ignore = ignore();
private patterns: string[] = [];
constructor(projectRoot: string) {
this.projectRoot = path.resolve(projectRoot);
}
loadGitRepoPatterns(): void {
if (!isGitRepository(this.projectRoot)) return;
// Always ignore .git directory regardless of .gitignore content
this.addPatterns(['.git']);
const patternFiles = ['.gitignore', path.join('.git', 'info', 'exclude')];
for (const pf of patternFiles) {
this.loadPatterns(pf);
}
}
loadPatterns(patternsFileName: string): void {
const patternsFilePath = path.join(this.projectRoot, patternsFileName);
let content: string;
try {
content = fs.readFileSync(patternsFilePath, 'utf-8');
} catch (_error) {
// ignore file not found
return;
}
const patterns = (content ?? '')
.split('\n')
.map((p) => p.trim())
.filter((p) => p !== '' && !p.startsWith('#'));
this.addPatterns(patterns);
}
private addPatterns(patterns: string[]) {
this.ig.add(patterns);
this.patterns.push(...patterns);
}
isIgnored(filePath: string): boolean {
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);
}
return this.ig.ignores(normalizedPath);
}
getPatterns(): string[] {
return this.patterns;
}
}
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