Simple live moves

src/move.ts

@@ -0,0 +1,65 @@
+import * as vscode from "vscode";
+import { LiveRunMove } from "./types";
+import { addRunMoves } from "./client";
+import { randomInt } from "crypto";
+
+let lastText = "";
+let lastCursor = 0;
+let moveId = 0;
+
+export function startMonitoring(runId: string) {
+  lastText = "";
+
+  return setInterval(() => {
+    const editor = vscode.window.activeTextEditor;
+    if (!editor) return;
+
+    const currentText = editor.document.getText();
+    const cursorOffset = editor.document.offsetAt(editor.selection.active);
+
+    let change: { from: number; to: number; insert: string } | undefined;
+
+    if (currentText !== lastText) {
+      let start = 0;
+      while (
+        start < lastText.length &&
+        start < currentText.length &&
+        lastText[start] === currentText[start]
+      ) {
+        start++;
+      }
+
+      let endOld = lastText.length - 1;
+      let endNew = currentText.length - 1;
+      while (
+        endOld >= start &&
+        endNew >= start &&
+        lastText[endOld] === currentText[endNew]
+      ) {
+        endOld--;
+        endNew--;
+      }
+
+      change = {
+        from: start,
+        to: endOld + 1, // ⚡ correct range in old text
+        insert: currentText.slice(start, endNew + 1),
+      };
+
+      lastText = currentText;
+    }
+
+    const move: LiveRunMove = {
+      latency: 300,
+      cursor: cursorOffset,
+      changes: change,
+      moveId,
+    };
+
+    if (move.changes || move.cursor !== lastCursor) {
+      addRunMoves(runId, [move]);
+    }
+
+    lastCursor = move.cursor;
+  }, 1000);
+}