João Salavisa
88 lines
2.5 KiB
TypeScript
88 lines
2.5 KiB
TypeScript
import { createTwoFilesPatch } from 'diff';
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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(
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original: string,
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modified: string,
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filename: string
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): 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 SHA256 hash of content
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* @param content - Content to hash
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* @returns Hex-encoded SHA256 hash
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*/
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export async function calculateHash(content: string): Promise<string> {
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// Use Web Crypto API for SHA256 hashing
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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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// Convert buffer to hex string
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const hashArray = Array.from(new Uint8Array(hashBuffer));
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const hashHex = hashArray.map(b => b.toString(16).padStart(2, '0')).join('');
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return hashHex;
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}
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/**
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* Calculate diff stats (additions and deletions)
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* @param diff - Unified diff string
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* @returns Object with additions and deletions count
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*/
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export function calculateDiffStats(diff: string): { additions: number; deletions: number } {
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const lines = diff.split('\n');
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let additions = 0;
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let deletions = 0;
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for (const line of lines) {
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if (line.startsWith('+') && !line.startsWith('+++')) {
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additions++;
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} else if (line.startsWith('-') && !line.startsWith('---')) {
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deletions++;
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}
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}
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return { additions, deletions };
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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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