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import * as path from 'path';
import dotenv from 'dotenv';
// Load environment variables
dotenv.config();
const DEFAULT_CONTEXT_DIR = './lamplighter_context';
const SUMMARY_FILE_NAME = 'codebase_summary.md';
// Tech stack detection patterns
const TECH_PATTERNS = {
nodejs: ['package.json', 'node_modules'],
typescript: ['tsconfig.json', '.ts', '.tsx'],
python: ['requirements.txt', 'setup.py', '.py'],
java: ['pom.xml', 'build.gradle', '.java'],
rust: ['Cargo.toml', '.rs'],
go: ['go.mod', '.go'],
docker: ['Dockerfile', 'docker-compose.yml'],
git: ['.git', '.gitignore'],
} as const;
// Directories to ignore
const IGNORE_DIRS = new Set([
'node_modules',
'dist',
'build',
'target',
'.git',
'__pycache__',
'venv',
'.env'
]);
export class CodebaseAnalyzer {
private contextDir: string;
private summaryPath: string;
constructor() {
this.contextDir = process.env.LAMPLIGHTER_CONTEXT_DIR || DEFAULT_CONTEXT_DIR;
this.summaryPath = path.join(this.contextDir, SUMMARY_FILE_NAME);
}
/**
* Analyzes the project structure and generates a summary
*/
async analyze(projectRoot: string): Promise<void> {
try {
// Ensure context directory exists
await fs.mkdir(this.contextDir, { recursive: true });
// Start building the summary content
const content: string[] = [];
content.push('# Codebase Summary\n');
content.push(`*Generated at: ${new Date().toISOString()}*\n`);
// Detect tech stack
const techStack = await this.detectTechStack(projectRoot);
content.push('## Tech Stack\n');
for (const [tech, evidence] of Object.entries(techStack)) {
Iif (evidence.length > 0) {
content.push(`- **${tech}** (detected from: ${evidence.join(', ')})`);
}
}
content.push('\n');
// Analyze directory structure
content.push('## Directory Structure\n');
content.push('```');
const dirStructure = await this.analyzeDirectory(projectRoot, 0);
content.push(dirStructure);
content.push('```\n');
// Write the summary to file
await fs.writeFile(this.summaryPath, content.join('\n'), 'utf-8');
console.log(`[CodebaseAnalyzer] Summary written to ${this.summaryPath}`);
} catch (error) {
console.error('[CodebaseAnalyzer] Error during analysis:', error);
throw error; // Re-throw to let caller handle it
}
}
/**
* Detects technologies used in the project
*/
private async detectTechStack(dir: string): Promise<Record<string, string[]>> {
const result: Record<string, string[]> = {};
for (const [tech, patterns] of Object.entries(TECH_PATTERNS)) {
result[tech] = [];
for (const pattern of patterns) {
if (pattern.startsWith('.')) {
// For file extensions, we need to search recursively
try {
const files = await this.findFilesByExtension(dir, pattern);
Iif (files.length > 0) {
result[tech].push(pattern);
break; // One match is enough
}
} catch (error) {
console.warn(`[CodebaseAnalyzer] Error searching for ${pattern} files:`, error);
}
} else {
// For specific files, just check if they exist
try {
const exists = await fs.access(path.join(dir, pattern))
.then(() => true)
.catch(() => false);
Iif (exists) {
result[tech].push(pattern);
}
} catch (error) {
console.warn(`[CodebaseAnalyzer] Error checking for ${pattern}:`, error);
}
}
}
}
return result;
}
/**
* Recursively analyzes directory structure
*/
private async analyzeDirectory(dir: string, depth: number): Promise<string> {
const indent = ' '.repeat(depth);
const result: string[] = [];
try {
const entries = await fs.readdir(dir, { withFileTypes: true });
const sortedEntries = entries.sort((a, b) => {
// Directories first, then files
Iif (a.isDirectory() && !b.isDirectory()) return -1;
if (!a.isDirectory() && b.isDirectory()) return 1;
return a.name.localeCompare(b.name);
});
for (const entry of sortedEntries) {
const fullPath = path.join(dir, entry.name);
// Skip ignored directories
Iif (entry.isDirectory() && IGNORE_DIRS.has(entry.name)) {
continue;
}
if (entry.isDirectory()) {
result.push(`${indent}📁 ${entry.name}/`);
const subDirContent = await this.analyzeDirectory(fullPath, depth + 1);
Iif (subDirContent) {
result.push(subDirContent);
}
} else {
result.push(`${indent}📄 ${entry.name}`);
}
}
} catch (error) {
console.error(`[CodebaseAnalyzer] Error analyzing directory ${dir}:`, error);
}
return result.join('\n');
}
/**
* Helper to find files with specific extension
*/
private async findFilesByExtension(dir: string, ext: string): Promise<string[]> {
const result: string[] = [];
try {
const entries = await fs.readdir(dir, { withFileTypes: true });
for (const entry of entries) {
const fullPath = path.join(dir, entry.name);
if (entry.isDirectory() && !IGNORE_DIRS.has(entry.name)) {
const subDirFiles = await this.findFilesByExtension(fullPath, ext);
result.push(...subDirFiles);
} else Iif (entry.isFile() && entry.name.endsWith(ext)) {
result.push(fullPath);
}
}
} catch (error) {
console.error(`[CodebaseAnalyzer] Error finding files with extension ${ext}:`, error);
}
return result;
}
}
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