denops_std

import { Denops } from "https://deno.land/x/denops_std/mod.ts";
import { execute } from "https://deno.land/x/denops_std/helper/mod.ts";
import { ensureString } from "https://deno.land/x/unknownutil/mod.ts";

export async function main(denops: Denops): Promise<void> {
  denops.dispatcher = {
    async say(where: unknown): Promise<void> {
      // Ensure that `where` is `string` here
      ensureString(where);
      // Use `call` to call Vim's function
      const name = await denops.call("input", "Your name: ");
      // Use `eval` to evaluate Vim's expression
      const progname = await denops.eval("v:progname");
      // Construct messages
      const messages = [
        `Hello ${where}`,
        `Your name is ${name}`,
        `This is ${progname}`,
      ];
      // Use `cmd` to execute Vim's command
      await denops.cmd(`redraw | echomsg message`, {
        message: messages.join(". "),
      });
    },
  };

  // Use 'execute()' to execute multiline Vim script
  await execute(
    denops,
    `
    command! HelloWorld call denops#notify("${denops.name}", "say", ["World"])
    command! HelloDenops call denops#notify("${denops.name}", "say", ["Denops"])
    `,
  );
}