OODA Computer Control

// Line ending detection and normalization utilities // Handles cross-platform line ending differences (CRLF on Windows, LF on Unix) export type LineEnding = '\n' | '\r\n'; /** * Detect the predominant line ending in a string * @param content - The content to analyze * @returns The detected line ending ('\n' or '\r\n') */ export function detectLineEnding(content: string): LineEnding { const crlfCount = (content.match(/\r\n/g) || []).length; // Match LF that is not preceded by CR const lfOnlyCount = (content.match(/(?<!\r)\n/g) || []).length; // If more CRLF than standalone LF, use CRLF return crlfCount > lfOnlyCount ? '\r\n' : '\n'; } /** * Normalize all line endings in a string to the target format * @param text - The text to normalize * @param target - The target line ending format * @returns Text with normalized line endings */ export function normalizeLineEndings(text: string, target: LineEnding): string { // First convert all line endings to LF const normalized = text.replace(/\r\n/g, '\n').replace(/\r/g, '\n'); // Then convert to target format if (target === '\r\n') { return normalized.replace(/\n/g, '\r\n'); } return normalized; } /** * Check if two strings are equal after normalizing line endings * @param a - First string * @param b - Second string * @returns True if equal after normalization */ export function equalIgnoringLineEndings(a: string, b: string): boolean { const normalizedA = normalizeLineEndings(a, '\n'); const normalizedB = normalizeLineEndings(b, '\n'); return normalizedA === normalizedB; } /** * Get a description of line ending differences between two strings * @param expected - The expected string * @param actual - The actual string * @returns Description of differences or null if line endings match */ export function describeLineEndingDifference(expected: string, actual: string): string | null { const expectedEnding = detectLineEnding(expected); const actualEnding = detectLineEnding(actual); if (expectedEnding !== actualEnding) { const expectedName = expectedEnding === '\r\n' ? 'CRLF (Windows)' : 'LF (Unix)'; const actualName = actualEnding === '\r\n' ? 'CRLF (Windows)' : 'LF (Unix)'; return `Line ending mismatch: search uses ${expectedName}, file uses ${actualName}`; } return null; }