refactor(buffer): move the current window cursor lookup to utils

src/utils/neovim.ts

@@ -0,0 +1,18 @@
+import { NeovimClient } from "neovim";
+import { Position } from "vscode";
+
+/**
+ * Get the (0, 0)-indexed byte cursor of the current neovim window, if it shows the given buffer
+ */
+export async function getCurrentWinCursorInBuf(client: NeovimClient, bufId: number): Promise<Position | undefined> {
+    const cursor = (await client.lua(
+        `
+        local buf = ...
+        if vim.api.nvim_get_current_buf() == buf then
+            return vim.api.nvim_win_get_cursor(0)
+        end
+        `,
+        [bufId],
+    )) as [number, number] | null;
+    return cursor ? new Position(cursor[0] - 1, cursor[1]) : undefined;
+}