basecoat/src/js/sidebar.js

(() => {
  // Monkey patching the history API to detect client-side navigation
  if (!window.history.__basecoatPatched) {
    const originalPushState = window.history.pushState;
    window.history.pushState = function(...args) {
      originalPushState.apply(this, args);
      window.dispatchEvent(new Event('basecoat:locationchange'));
    };
    
    const originalReplaceState = window.history.replaceState;
    window.history.replaceState = function(...args) {
      originalReplaceState.apply(this, args);
      window.dispatchEvent(new Event('basecoat:locationchange'));
    };

    window.history.__basecoatPatched = true;
  }

  const initSidebar = (sidebarComponent) => {
    const initialOpen = sidebarComponent.dataset.initialOpen !== 'false';
    const initialMobileOpen = sidebarComponent.dataset.initialMobileOpen === 'true';
    const breakpoint = parseInt(sidebarComponent.dataset.breakpoint) || 768;
    
    let open = breakpoint > 0 
      ? (window.innerWidth >= breakpoint ? initialOpen : initialMobileOpen)
      : initialOpen;
    
    const updateCurrentPageLinks = () => {
      const currentPath = window.location.pathname.replace(/\/$/, '');
      sidebarComponent.querySelectorAll('a').forEach(link => {
        if (link.hasAttribute('data-ignore-current')) return;
        
        const linkPath = new URL(link.href).pathname.replace(/\/$/, '');
        if (linkPath === currentPath) {
          link.setAttribute('aria-current', 'page');
        } else {
          link.removeAttribute('aria-current');
        }
      });
    };
    
    const updateState = () => {
      sidebarComponent.setAttribute('aria-hidden', !open);
      if (open) {
        sidebarComponent.removeAttribute('inert');
      } else {
        sidebarComponent.setAttribute('inert', '');
      }
    };

    const setState = (state) => {
      open = state;
      updateState();
    };

    const sidebarId = sidebarComponent.id;

    document.addEventListener('basecoat:sidebar', (event) => {
      if (event.detail?.id && event.detail.id !== sidebarId) return;

      switch (event.detail?.action) {
        case 'open':
          setState(true);
          break;
        case 'close':
          setState(false);
          break;
        default:
          setState(!open);
          break;
      }
    });
    
    sidebarComponent.addEventListener('click', (event) => {
      const target = event.target;
      const nav = sidebarComponent.querySelector('nav');
      
      const isMobile = window.innerWidth < breakpoint;
      
      if (isMobile && (target.closest('a, button') && !target.closest('[data-keep-mobile-sidebar-open]'))) {
        if (document.activeElement) document.activeElement.blur();
        setState(false);
        return;
      }
      
      if (target === sidebarComponent || (nav && !nav.contains(target))) {
        if (document.activeElement) document.activeElement.blur();
        setState(false);
      }
    });

    window.addEventListener('popstate', updateCurrentPageLinks);
    window.addEventListener('basecoat:locationchange', updateCurrentPageLinks);

    updateState();
    updateCurrentPageLinks();
    sidebarComponent.dataset.sidebarInitialized = true;
    sidebarComponent.dispatchEvent(new CustomEvent('basecoat:initialized'));
  };

  if (window.basecoat) {
    window.basecoat.register('sidebar', '.sidebar:not([data-sidebar-initialized])', initSidebar);
  }
})();