Send cursors instantly

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)
+	}));
+}

frontend/obsidian-plugin/src/views/cursors/local-cursor-update-listener.ts

@@ -0,0 +1,57 @@
+import {
+	EventRef,
+	Workspace,
+	Editor,
+	MarkdownView,
+	MarkdownFileInfo
+} from "obsidian";
+import { SyncClient } from "sync-client";
+import { Cursor, getCursorsFromEditor } from "./get-cursors-from-editor";
+
+export class LocalCursorUpdateListener {
+	private static readonly UPDATE_INTERVAL_MS = 50;
+	private readonly eventHandle: NodeJS.Timeout;
+	private lastCursorState: Record<string, Cursor[]> = {};
+
+	public constructor(
+		private readonly client: SyncClient,
+		private readonly workspace: Workspace
+	) {
+		this.eventHandle = setInterval(
+			() => this.updateAllCursors(),
+			LocalCursorUpdateListener.UPDATE_INTERVAL_MS
+		);
+	}
+
+	private updateAllCursors(): void {
+		const currentCursors = this.getAllCursors();
+		if (
+			JSON.stringify(this.lastCursorState) ===
+			JSON.stringify(currentCursors)
+		) {
+			return;
+		}
+		this.lastCursorState = currentCursors;
+		this.client.updateLocalCursors(currentCursors);
+	}
+
+	private getAllCursors(): Record<string, Cursor[]> {
+		const cursors: Record<string, Cursor[]> = {};
+		this.workspace
+			.getLeavesOfType("markdown")
+			.map((leaf) => leaf.view)
+			.filter((view) => view instanceof MarkdownView)
+			.forEach((view) => {
+				const { file } = view;
+				if (!file) {
+					return;
+				}
+				cursors[file.path] = getCursorsFromEditor(view.editor);
+			});
+		return cursors;
+	}
+
+	public dispose(): void {
+		clearInterval(this.eventHandle);
+	}
+}