/**
* File Hash Comparison
* [ENH: DIFF] Hash-based change detection for non-Git repositories
*/
import { createHash } from 'crypto';
import { ChangedFile, FileChangeStatus } from './types.js';
import { FileContext } from '../types/index.js';
/**
* Compute SHA-256 hash of file content
*/
export function computeFileHash(content: string): string {
return createHash('sha256').update(content).digest('hex');
}
/**
* Compute hashes for all files in context
*/
export function computeContextHashes(
files: Map<string, FileContext>
): Record<string, string> {
const hashes: Record<string, string> = {};
for (const [path, fileCtx] of files) {
if (fileCtx.content) {
hashes[path] = computeFileHash(fileCtx.content);
}
}
return hashes;
}
/**
* Compare current file hashes against baseline hashes
*/
export function compareHashes(
currentHashes: Record<string, string>,
baselineHashes: Record<string, string>
): ChangedFile[] {
const changedFiles: ChangedFile[] = [];
const allPaths = new Set([
...Object.keys(currentHashes),
...Object.keys(baselineHashes)
]);
for (const path of allPaths) {
const currentHash = currentHashes[path];
const baselineHash = baselineHashes[path];
let status: FileChangeStatus;
if (!baselineHash && currentHash) {
status = 'added';
} else if (baselineHash && !currentHash) {
status = 'deleted';
} else if (currentHash !== baselineHash) {
status = 'modified';
} else {
status = 'unchanged';
}
if (status !== 'unchanged') {
changedFiles.push({
path,
status,
linesAdded: 0, // Can't determine without content comparison
linesDeleted: 0
});
}
}
return changedFiles;
}
