Add API for propagating cursor locations (#61)

frontend/obsidian-plugin/src/views/cursors/get-cursors-from-editor.ts

@@ -0,0 +1,17 @@
+import type { Editor } from "obsidian";
+import { lineAndColumnToPosition } from "../../utils/line-and-column-to-position";
+
+export interface Cursor {
+	id: number;
+	start: number;
+	end: number;
+}
+
+export function getCursorsFromEditor(editor: Editor): Cursor[] {
+	const text = editor.getValue();
+	return editor.listSelections().map(({ anchor, head }, i) => ({
+		id: i,
+		start: lineAndColumnToPosition(text, anchor.line, anchor.ch),
+		end: lineAndColumnToPosition(text, head.line, head.ch)
+	}));
+}