Initial commit

src/core/todo-transformer.ts

@@ -0,0 +1,98 @@
+/**
+ * Regex pattern for markdown todo checkboxes (for toggling).
+ */
+const TODO_PATTERN = /^(\s*[-*+]\s+\[)([xX ]?)(\].*)$/;
+
+/**
+ * Toggle the checkbox state at the specified line number.
+ * Returns the modified content.
+ */
+export function toggleTodo(content: string, lineNumber: number): string {
+	const lines = content.split('\n');
+
+	if (lineNumber < 0 || lineNumber >= lines.length) {
+		return content;
+	}
+
+	const line = lines[lineNumber];
+	if (line === undefined) {
+		return content;
+	}
+
+	const match = line.match(TODO_PATTERN);
+	if (!match) {
+		return content;
+	}
+
+	const checkboxContent = match[2];
+	const isChecked = checkboxContent === 'x' || checkboxContent === 'X';
+	const newCheckbox = isChecked ? ' ' : 'x';
+
+	lines[lineNumber] = `${match[1]}${newCheckbox}${match[3]}`;
+	return lines.join('\n');
+}
+
+/**
+ * Remove the line at the specified line number.
+ * Returns the modified content.
+ */
+export function removeTodoLine(content: string, lineNumber: number): string {
+	const lines = content.split('\n');
+
+	if (lineNumber < 0 || lineNumber >= lines.length) {
+		return content;
+	}
+
+	lines.splice(lineNumber, 1);
+	return lines.join('\n');
+}
+
+/**
+ * Insert a todo line at the end of the content.
+ * Handles files with/without trailing newlines.
+ */
+export function insertTodoAtEnd(content: string, todoLine: string): string {
+	if (!content) {
+		return todoLine;
+	}
+
+	// If content ends with newline(s), append directly
+	if (content.endsWith('\n')) {
+		return content + todoLine;
+	}
+
+	// Otherwise add a newline before the todo
+	return content + '\n' + todoLine;
+}
+
+/**
+ * Insert a todo line under a specific heading.
+ * @param content - The file content
+ * @param headingLineNumber - The line number of the heading (0-based)
+ * @param todoLine - The todo line to insert
+ * @param nextHeadingLineNumber - Optional line number of the next heading (for section boundary)
+ */
+export function insertTodoUnderHeading(
+	content: string,
+	headingLineNumber: number,
+	todoLine: string,
+	nextHeadingLineNumber?: number
+): string {
+	const lines = content.split('\n');
+
+	// Determine where to insert
+	let insertPosition: number;
+
+	if (nextHeadingLineNumber !== undefined) {
+		// Insert just before the next heading (at the end of this section)
+		insertPosition = nextHeadingLineNumber;
+	} else {
+		// No next heading - insert right after the heading line
+		insertPosition = headingLineNumber + 1;
+	}
+
+	// Insert the todo line
+	lines.splice(insertPosition, 0, todoLine);
+
+	return lines.join('\n');
+}