/**
* Simple text diff utility for preview/comparison.
* Produces a human-readable diff between two strings.
*/
export interface DiffResult {
original: string;
proposed: string;
diff: string;
hasChanges: boolean;
}
/**
* Generate a simple line-by-line diff between two strings.
* Uses - for removed lines and + for added lines.
*/
export function generateDiff(original: string, proposed: string): DiffResult {
const originalLines = original.split('\n');
const proposedLines = proposed.split('\n');
const diffLines: string[] = [];
const maxLen = Math.max(originalLines.length, proposedLines.length);
let hasChanges = false;
for (let i = 0; i < maxLen; i++) {
const origLine = originalLines[i];
const propLine = proposedLines[i];
if (origLine === propLine) {
if (origLine !== undefined) {
diffLines.push(` ${origLine}`);
}
} else {
hasChanges = true;
if (origLine !== undefined) {
diffLines.push(`- ${origLine}`);
}
if (propLine !== undefined) {
diffLines.push(`+ ${propLine}`);
}
}
}
return {
original,
proposed,
diff: diffLines.join('\n'),
hasChanges,
};
}
/**
* Format a card for display, showing key info.
*/
export function formatCardPreview(card: {
id: string;
content: string;
tags?: string[];
'deck-id'?: string;
}): string {
const lines = [
`**Card ID:** ${card.id}`,
card['deck-id'] ? `**Deck:** ${card['deck-id']}` : null,
card.tags && card.tags.length > 0 ? `**Tags:** ${card.tags.join(', ')}` : null,
'',
'**Content:**',
'```',
card.content,
'```',
].filter(Boolean);
return lines.join('\n');
}
