João Salavisa
70e6eb8895
Co-authored-by: Kandev Agent <agent@kandev.dev> Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>
70 lines
2.3 KiB
TypeScript
70 lines
2.3 KiB
TypeScript
import { createTwoFilesPatch } from "diff";
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import { djb2Hash } from "./hash";
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/**
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* Generate a unified diff between original and modified content
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* @param original - Original file content
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* @param modified - Modified file content
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* @param filename - File name (used in diff header)
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* @returns Unified diff string
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*/
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export function generateUnifiedDiff(original: string, modified: string, filename: string): string {
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// createTwoFilesPatch generates a unified diff with headers
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// Parameters: oldFileName, newFileName, oldStr, newStr, oldHeader, newHeader, options
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// Note: oldHeader and newHeader should be empty strings or valid timestamps
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// The go-diff library on the backend expects standard unified diff format
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const diff = createTwoFilesPatch(
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filename,
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filename,
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original,
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modified,
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"", // Empty oldHeader - backend doesn't need timestamps
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"", // Empty newHeader - backend doesn't need timestamps
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{ context: 3 }, // Number of context lines
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);
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return diff;
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}
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/**
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* Calculate hash of content for change detection.
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* Uses Web Crypto API (SHA-256) in secure contexts (HTTPS, localhost).
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* Falls back to djb2 in non-secure contexts (HTTP) — sufficient for detecting
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* content changes, not for security purposes.
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* @param content - Content to hash
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* @returns Hex-encoded hash string
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*/
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export async function calculateHash(content: string): Promise<string> {
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// crypto.subtle is only available in secure contexts (HTTPS, localhost)
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if (typeof crypto !== "undefined" && crypto.subtle) {
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try {
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const encoder = new TextEncoder();
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const data = encoder.encode(content);
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const hashBuffer = await crypto.subtle.digest("SHA-256", data);
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const hashArray = Array.from(new Uint8Array(hashBuffer));
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return hashArray.map((b) => b.toString(16).padStart(2, "0")).join("");
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} catch {
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// Fall through to djb2
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}
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}
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return djb2Hash(content);
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}
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/**
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* Format diff stats for display
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* @param additions - Number of additions
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* @param deletions - Number of deletions
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* @returns Formatted string like "+5 -3"
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*/
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export function formatDiffStats(additions: number, deletions: number): string {
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const parts: string[] = [];
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if (additions > 0) {
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parts.push(`+${additions}`);
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}
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if (deletions > 0) {
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parts.push(`-${deletions}`);
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}
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return parts.join(" ") || "No changes";
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}
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