.

Author: sacrosanctic

packages/sv-utils/src/tooling/md.ts

@@ -1,15 +1,51 @@
 type Header = `${'#' | '##' | '###' | '####' | '#####' | '######'} ${string}`;
 
 const HEADER_REGEX = /^#{1,6} .+$/m;
+const HEADER_LEVEL_REGEX = /^#{1,6} /m;
+
+function getHeaderLevel(header: Header): number {
+	return header.split(' ')[0].length;
+}
+
+function findSection(
+	content: string,
+	header: Header
+): { content: string; start: number; end: number } | null {
+	const [headerLevel, ...headerNameArray] = header.split(' ');
+	const headerName = headerNameArray.join(' ');
+
+	const sectionRegex = new RegExp(`^(${headerLevel}) ${escapeRegex(headerName)}\\s*$`, 'm');
+	const headerMatch = content.match(sectionRegex);
+
+	if (!headerMatch) return null;
+
+	const start = headerMatch.index!;
+
+	const afterHeader = content.slice(start + header.length);
+	const nextHeaderMatch = afterHeader.match(HEADER_LEVEL_REGEX);
+
+	let end: number;
+	if (nextHeaderMatch) {
+		end = start + header.length + afterHeader.indexOf(nextHeaderMatch[0]);
+	} else {
+		end = content.length;
+	}
+
+	return {
+		content: content.slice(start, end),
+		start,
+		end
+	};
+}
 
 export function upsert(
 	content: string,
 	lines: Array<string | false | undefined | null | 0 | 0n>,
 	options?: {
 		header?: {
 			name: Header;
-			parent: Header;
-			position: 'prepend' | 'append';
+			parent?: Header;
+			// position?: 'prepend' | 'append';
 		};
 		// mode?: 'prepend' | 'append';
 	}