Denoからslurpとswaymsg叩いてクリックしたウィンドウのサイズを取得するやつ

slurp_window.ts

import * as u from "https://deno.land/x/unknownutil@v3.11.0/mod.ts";
import { is } from "https://deno.land/x/unknownutil@v3.11.0/mod.ts";

type Point = {
  x: number;
  y: number;
};

type Rect = Point & {
  width: number;
  height: number;
};

const isRect: u.Predicate<Rect> = is.ObjectOf({
  x: is.Number,
  y: is.Number,
  width: is.Number,
  height: is.Number,
});

function isInside(rect: Rect, point: Point) {
  // ポイントが矩形内にあるかどうかを判定
  // https://chat.openai.com/share/8b910f79-b5ca-468f-b4f3-d4aab8f145c1
  return (
    point.x >= rect.x &&
    point.x <= rect.x + rect.width &&
    point.y >= rect.y &&
    point.y <= rect.y + rect.height
  );
}

function* query<T>(
  root: unknown,
  finder: (obj: unknown) => obj is T,
): Generator<T> {
  const queue = [root];
  for (let i = 0; i < queue.length; i++) {
    const obj = queue[i];
    if (finder(obj)) {
      yield obj;
    }
    if (is.Array(obj)) {
      queue.push(...obj);
    } else if (is.Record(obj)) {
      queue.push(Object.values(obj));
    }
  }
}

export async function exec(cmd: string[], cwd?: string): Promise<string> {
  if (cwd == null) {
    cwd = Deno.cwd();
  }
  const proc = new Deno.Command(cmd[0], {
    args: cmd.slice(1),
    cwd,
  });
  const { stdout } = await proc.output();
  return new TextDecoder().decode(stdout).trimEnd();
}

const slurp = await exec(["slurp", "-p"]);
const match = slurp.match(/(\d+),(\d+)/);
if (match == null) {
  Deno.exit(1);
}
const point = {
  x: Number(match[1]),
  y: Number(match[2]),
};

const tree = JSON.parse(
  await exec(["swaymsg", "-t", "get_tree"]),
);

const windows = query(
  tree,
  is.ObjectOf({
    rect: isRect,
    visible: is.LiteralOf(true),
    window_rect: isRect,
  }),
);
const target = [...windows].reverse().filter((w) => isInside(w.rect, point))[0];
if (target == null) {
  Deno.exit(1);
}
const r = target.rect;
if (Deno.args.indexOf("-w") == -1) {
  const wr = target.window_rect;
  console.log(`${r.x + wr.x},${r.y + wr.y} ${wr.width}x${wr.height}`);
} else {
  console.log(`${r.x},${r.y} ${r.width}x${r.height}`);
}