Open Instagram App.user.js

// ==UserScript==
// @name         Open Instagram App
// @version      1.4.0
// @author       ryuya
// @match        *://*.instagram.com/*
// @downloadURL  https://gist.github.com/ryuya0124/79fad15aa00e536cac7cae2bad6283c6/raw/356b473b688b874398ecc22f41eaba42d2aed3bc/Open%2520Instagram%2520App.user.js
// @updateURL    https://gist.github.com/ryuya0124/79fad15aa00e536cac7cae2bad6283c6/raw/356b473b688b874398ecc22f41eaba42d2aed3bc/Open%2520Instagram%2520App.user.js
// @homepage     https://gist.github.com/ryuya0124/79fad15aa00e536cac7cae2bad6283c6
// ==/UserScript==

if (window.location.pathname === '/redirect') return;

let targetUrl = '';

if (window.location.pathname.includes('/direct')) {
  // ダイレクトメッセージを処理
  targetUrl = 'instagram://direct-inbox';
} else if (window.location.pathname.includes('/explore')) {
  // Exploreページなど他のページを処理
  targetUrl = `instagram://explore${window.location.pathname}${window.location.search}${window.location.hash}`;
} else if (window.location.pathname.includes('/reels')) {
  // Reelsページなど他のページを処理
  targetUrl = `instagram://reels${window.location.pathname}${window.location.search}${window.location.hash}`;
} else if (window.location.pathname.includes('/stories')) {
  // Storiesページなど他のページを処理
  targetUrl = `instagram://app`
} else {
  // 通常のユーザープロフィールURLを処理
  const usernameMatch = window.location.pathname.match(/\/([^\/?]+)/);
  if (usernameMatch) {
    const username = usernameMatch[1];
    targetUrl = `instagram://user?username=${username}${window.location.search}${window.location.hash}`;
  } else {
    // その他のケースを処理、例：投稿
    targetUrl = `instagram://media${window.location.pathname}${window.location.search}${window.location.hash}`;
  }
}

window.location.href = targetUrl;