feat: rewritten Figure shortcode supporting multi-resolutions

New shortcode supports
- enable re-usable *optimized* image assets from new primary media library location at `assets/images/`
- new behavior: load image from page dir falling back to media library at `assets/images/` and then to remote URI.
- multi-res support. leading to increased perf.
- custom ID for cross-refs
- efficient, vanilla (non-jQuery), MIT licensed image zooming
- FancyBox now only loaded for Gallery shortcode
- themeable SVG support
- native lazy loading

Experimental, may change.

BREAKING CHANGE:
Move any figure images (i.e. not the `sharing.*` image) from `static/media/` to `assets/images/`

See #2164

package.json

@@ -15,7 +15,8 @@
   "main": "index.js",
   "dependencies": {
     "bootstrap": "^4.4.1",
-    "instant.page": "^5.1.0"
+    "instant.page": "^5.1.0",
+    "medium-zoom": "^1.0.6"
   },
   "devDependencies": {
     "eslint": "^7.17.0",

wowchemy/assets/js/_vendor/medium-zoom.esm.js

@@ -0,0 +1,622 @@
+/*! medium-zoom 1.0.6 | MIT License | https://github.com/francoischalifour/medium-zoom */
+var _extends = Object.assign || function (target) {
+  for (var i = 1; i < arguments.length; i++) {
+    var source = arguments[i];
+
+    for (var key in source) {
+      if (Object.prototype.hasOwnProperty.call(source, key)) {
+        target[key] = source[key];
+      }
+    }
+  }
+
+  return target;
+};
+
+var isSupported = function isSupported(node) {
+  return node.tagName === 'IMG';
+};
+
+/* eslint-disable-next-line no-prototype-builtins */
+var isNodeList = function isNodeList(selector) {
+  return NodeList.prototype.isPrototypeOf(selector);
+};
+
+var isNode = function isNode(selector) {
+  return selector && selector.nodeType === 1;
+};
+
+var isSvg = function isSvg(image) {
+  var source = image.currentSrc || image.src;
+  return source.substr(-4).toLowerCase() === '.svg';
+};
+
+var getImagesFromSelector = function getImagesFromSelector(selector) {
+  try {
+    if (Array.isArray(selector)) {
+      return selector.filter(isSupported);
+    }
+
+    if (isNodeList(selector)) {
+      // Do not use spread operator or Array.from() for IE support
+      return [].slice.call(selector).filter(isSupported);
+    }
+
+    if (isNode(selector)) {
+      return [selector].filter(isSupported);
+    }
+
+    if (typeof selector === 'string') {
+      // Do not use spread operator or Array.from() for IE support
+      return [].slice.call(document.querySelectorAll(selector)).filter(isSupported);
+    }
+
+    return [];
+  } catch (err) {
+    throw new TypeError('The provided selector is invalid.\n' + 'Expects a CSS selector, a Node element, a NodeList or an array.\n' + 'See: https://github.com/francoischalifour/medium-zoom');
+  }
+};
+
+var createOverlay = function createOverlay(background) {
+  var overlay = document.createElement('div');
+  overlay.classList.add('medium-zoom-overlay');
+  overlay.style.background = background;
+
+  return overlay;
+};
+
+var cloneTarget = function cloneTarget(template) {
+  var _template$getBounding = template.getBoundingClientRect(),
+      top = _template$getBounding.top,
+      left = _template$getBounding.left,
+      width = _template$getBounding.width,
+      height = _template$getBounding.height;
+
+  var clone = template.cloneNode();
+  var scrollTop = window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop || 0;
+  var scrollLeft = window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft || 0;
+
+  clone.removeAttribute('id');
+  clone.style.position = 'absolute';
+  clone.style.top = top + scrollTop + 'px';
+  clone.style.left = left + scrollLeft + 'px';
+  clone.style.width = width + 'px';
+  clone.style.height = height + 'px';
+  clone.style.transform = '';
+
+  return clone;
+};
+
+var createCustomEvent = function createCustomEvent(type, params) {
+  var eventParams = _extends({
+    bubbles: false,
+    cancelable: false,
+    detail: undefined
+  }, params);
+
+  if (typeof window.CustomEvent === 'function') {
+    return new CustomEvent(type, eventParams);
+  }
+
+  var customEvent = document.createEvent('CustomEvent');
+  customEvent.initCustomEvent(type, eventParams.bubbles, eventParams.cancelable, eventParams.detail);
+
+  return customEvent;
+};
+
+var mediumZoomEsm = function mediumZoom(selector) {
+  var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
+
+  /**
+   * Ensure the compatibility with IE11 if no Promise polyfill are used.
+   */
+  var Promise = window.Promise || function Promise(fn) {
+    function noop() {}
+    fn(noop, noop);
+  };
+
+  var _handleClick = function _handleClick(event) {
+    var target = event.target;
+
+
+    if (target === overlay) {
+      close();
+      return;
+    }
+
+    if (images.indexOf(target) === -1) {
+      return;
+    }
+
+    toggle({ target: target });
+  };
+
+  var _handleScroll = function _handleScroll() {
+    if (isAnimating || !active.original) {
+      return;
+    }
+
+    var currentScroll = window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop || 0;
+
+    if (Math.abs(scrollTop - currentScroll) > zoomOptions.scrollOffset) {
+      setTimeout(close, 150);
+    }
+  };
+
+  var _handleKeyUp = function _handleKeyUp(event) {
+    var key = event.key || event.keyCode;
+
+    // Close if escape key is pressed
+    if (key === 'Escape' || key === 'Esc' || key === 27) {
+      close();
+    }
+  };
+
+  var update = function update() {
+    var options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
+
+    var newOptions = options;
+
+    if (options.background) {
+      overlay.style.background = options.background;
+    }
+
+    if (options.container && options.container instanceof Object) {
+      newOptions.container = _extends({}, zoomOptions.container, options.container);
+    }
+
+    if (options.template) {
+      var template = isNode(options.template) ? options.template : document.querySelector(options.template);
+
+      newOptions.template = template;
+    }
+
+    zoomOptions = _extends({}, zoomOptions, newOptions);
+
+    images.forEach(function (image) {
+      image.dispatchEvent(createCustomEvent('medium-zoom:update', {
+        detail: { zoom: zoom }
+      }));
+    });
+
+    return zoom;
+  };
+
+  var clone = function clone() {
+    var options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
+    return mediumZoomEsm(_extends({}, zoomOptions, options));
+  };
+
+  var attach = function attach() {
+    for (var _len = arguments.length, selectors = Array(_len), _key = 0; _key < _len; _key++) {
+      selectors[_key] = arguments[_key];
+    }
+
+    var newImages = selectors.reduce(function (imagesAccumulator, currentSelector) {
+      return [].concat(imagesAccumulator, getImagesFromSelector(currentSelector));
+    }, []);
+
+    newImages.filter(function (newImage) {
+      return images.indexOf(newImage) === -1;
+    }).forEach(function (newImage) {
+      images.push(newImage);
+      newImage.classList.add('medium-zoom-image');
+    });
+
+    eventListeners.forEach(function (_ref) {
+      var type = _ref.type,
+          listener = _ref.listener,
+          options = _ref.options;
+
+      newImages.forEach(function (image) {
+        image.addEventListener(type, listener, options);
+      });
+    });
+
+    return zoom;
+  };
+
+  var detach = function detach() {
+    for (var _len2 = arguments.length, selectors = Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {
+      selectors[_key2] = arguments[_key2];
+    }
+
+    if (active.zoomed) {
+      close();
+    }
+
+    var imagesToDetach = selectors.length > 0 ? selectors.reduce(function (imagesAccumulator, currentSelector) {
+      return [].concat(imagesAccumulator, getImagesFromSelector(currentSelector));
+    }, []) : images;
+
+    imagesToDetach.forEach(function (image) {
+      image.classList.remove('medium-zoom-image');
+      image.dispatchEvent(createCustomEvent('medium-zoom:detach', {
+        detail: { zoom: zoom }
+      }));
+    });
+
+    images = images.filter(function (image) {
+      return imagesToDetach.indexOf(image) === -1;
+    });
+
+    return zoom;
+  };
+
+  var on = function on(type, listener) {
+    var options = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
+
+    images.forEach(function (image) {
+      image.addEventListener('medium-zoom:' + type, listener, options);
+    });
+
+    eventListeners.push({ type: 'medium-zoom:' + type, listener: listener, options: options });
+
+    return zoom;
+  };
+
+  var off = function off(type, listener) {
+    var options = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
+
+    images.forEach(function (image) {
+      image.removeEventListener('medium-zoom:' + type, listener, options);
+    });
+
+    eventListeners = eventListeners.filter(function (eventListener) {
+      return !(eventListener.type === 'medium-zoom:' + type && eventListener.listener.toString() === listener.toString());
+    });
+
+    return zoom;
+  };
+
+  var open = function open() {
+    var _ref2 = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {},
+        target = _ref2.target;
+
+    var _animate = function _animate() {
+      var container = {
+        width: document.documentElement.clientWidth,
+        height: document.documentElement.clientHeight,
+        left: 0,
+        top: 0,
+        right: 0,
+        bottom: 0
+      };
+      var viewportWidth = void 0;
+      var viewportHeight = void 0;
+
+      if (zoomOptions.container) {
+        if (zoomOptions.container instanceof Object) {
+          // The container is given as an object with properties like width, height, left, top
+          container = _extends({}, container, zoomOptions.container);
+
+          // We need to adjust custom options like container.right or container.bottom
+          viewportWidth = container.width - container.left - container.right - zoomOptions.margin * 2;
+          viewportHeight = container.height - container.top - container.bottom - zoomOptions.margin * 2;
+        } else {
+          // The container is given as an element
+          var zoomContainer = isNode(zoomOptions.container) ? zoomOptions.container : document.querySelector(zoomOptions.container);
+
+          var _zoomContainer$getBou = zoomContainer.getBoundingClientRect(),
+              _width = _zoomContainer$getBou.width,
+              _height = _zoomContainer$getBou.height,
+              _left = _zoomContainer$getBou.left,
+              _top = _zoomContainer$getBou.top;
+
+          container = _extends({}, container, {
+            width: _width,
+            height: _height,
+            left: _left,
+            top: _top
+          });
+        }
+      }
+
+      viewportWidth = viewportWidth || container.width - zoomOptions.margin * 2;
+      viewportHeight = viewportHeight || container.height - zoomOptions.margin * 2;
+
+      var zoomTarget = active.zoomedHd || active.original;
+      var naturalWidth = isSvg(zoomTarget) ? viewportWidth : zoomTarget.naturalWidth || viewportWidth;
+      var naturalHeight = isSvg(zoomTarget) ? viewportHeight : zoomTarget.naturalHeight || viewportHeight;
+
+      var _zoomTarget$getBoundi = zoomTarget.getBoundingClientRect(),
+          top = _zoomTarget$getBoundi.top,
+          left = _zoomTarget$getBoundi.left,
+          width = _zoomTarget$getBoundi.width,
+          height = _zoomTarget$getBoundi.height;
+
+      var scaleX = Math.min(naturalWidth, viewportWidth) / width;
+      var scaleY = Math.min(naturalHeight, viewportHeight) / height;
+      var scale = Math.min(scaleX, scaleY);
+      var translateX = (-left + (viewportWidth - width) / 2 + zoomOptions.margin + container.left) / scale;
+      var translateY = (-top + (viewportHeight - height) / 2 + zoomOptions.margin + container.top) / scale;
+      var transform = 'scale(' + scale + ') translate3d(' + translateX + 'px, ' + translateY + 'px, 0)';
+
+      active.zoomed.style.transform = transform;
+
+      if (active.zoomedHd) {
+        active.zoomedHd.style.transform = transform;
+      }
+    };
+
+    return new Promise(function (resolve) {
+      if (target && images.indexOf(target) === -1) {
+        resolve(zoom);
+        return;
+      }
+
+      var _handleOpenEnd = function _handleOpenEnd() {
+        isAnimating = false;
+        active.zoomed.removeEventListener('transitionend', _handleOpenEnd);
+        active.original.dispatchEvent(createCustomEvent('medium-zoom:opened', {
+          detail: { zoom: zoom }
+        }));
+
+        resolve(zoom);
+      };
+
+      if (active.zoomed) {
+        resolve(zoom);
+        return;
+      }
+
+      if (target) {
+        // The zoom was triggered manually via a click
+        active.original = target;
+      } else if (images.length > 0) {
+var _images = images;
+        active.original = _images[0];
+      } else {
+        resolve(zoom);
+        return;
+      }
+
+      active.original.dispatchEvent(createCustomEvent('medium-zoom:open', {
+        detail: { zoom: zoom }
+      }));
+
+      scrollTop = window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop || 0;
+      isAnimating = true;
+      active.zoomed = cloneTarget(active.original);
+
+      document.body.appendChild(overlay);
+
+      if (zoomOptions.template) {
+        var template = isNode(zoomOptions.template) ? zoomOptions.template : document.querySelector(zoomOptions.template);
+        active.template = document.createElement('div');
+        active.template.appendChild(template.content.cloneNode(true));
+
+        document.body.appendChild(active.template);
+      }
+
+      document.body.appendChild(active.zoomed);
+
+      window.requestAnimationFrame(function () {
+        document.body.classList.add('medium-zoom--opened');
+      });
+
+      active.original.classList.add('medium-zoom-image--hidden');
+      active.zoomed.classList.add('medium-zoom-image--opened');
+
+      active.zoomed.addEventListener('click', close);
+      active.zoomed.addEventListener('transitionend', _handleOpenEnd);
+
+      if (active.original.getAttribute('data-zoom-src')) {
+        active.zoomedHd = active.zoomed.cloneNode();
+
+        // Reset the `scrset` property or the HD image won't load.
+        active.zoomedHd.removeAttribute('srcset');
+        active.zoomedHd.removeAttribute('sizes');
+
+        active.zoomedHd.src = active.zoomed.getAttribute('data-zoom-src');
+
+        active.zoomedHd.onerror = function () {
+          clearInterval(getZoomTargetSize);
+          console.warn('Unable to reach the zoom image target ' + active.zoomedHd.src);
+          active.zoomedHd = null;
+          _animate();
+        };
+
+        // We need to access the natural size of the full HD
+        // target as fast as possible to compute the animation.
+        var getZoomTargetSize = setInterval(function () {
+          if ( active.zoomedHd.complete) {
+            clearInterval(getZoomTargetSize);
+            active.zoomedHd.classList.add('medium-zoom-image--opened');
+            active.zoomedHd.addEventListener('click', close);
+            document.body.appendChild(active.zoomedHd);
+            _animate();
+          }
+        }, 10);
+      } else if (active.original.hasAttribute('srcset')) {
+        // If an image has a `srcset` attribuet, we don't know the dimensions of the
+        // zoomed (HD) image (like when `data-zoom-src` is specified).
+        // Therefore the approach is quite similar.
+        active.zoomedHd = active.zoomed.cloneNode();
+
+        // Resetting the sizes attribute tells the browser to load the
+        // image best fitting the current viewport size, respecting the `srcset`.
+        active.zoomedHd.removeAttribute('sizes');
+
+        // In Firefox, the `loading` attribute needs to be set to `eager` (default
+        // value) for the load event to be fired.
+        active.zoomedHd.removeAttribute('loading');
+
+        // Wait for the load event of the hd image. This will fire if the image
+        // is already cached.
+        var loadEventListener = active.zoomedHd.addEventListener('load', function () {
+          active.zoomedHd.removeEventListener('load', loadEventListener);
+          active.zoomedHd.classList.add('medium-zoom-image--opened');
+          active.zoomedHd.addEventListener('click', close);
+          document.body.appendChild(active.zoomedHd);
+          _animate();
+        });
+      } else {
+        _animate();
+      }
+    });
+  };
+
+  var close = function close() {
+    return new Promise(function (resolve) {
+      if (isAnimating || !active.original) {
+        resolve(zoom);
+        return;
+      }
+
+      var _handleCloseEnd = function _handleCloseEnd() {
+        active.original.classList.remove('medium-zoom-image--hidden');
+        document.body.removeChild(active.zoomed);
+        if (active.zoomedHd) {
+          document.body.removeChild(active.zoomedHd);
+        }
+        document.body.removeChild(overlay);
+        active.zoomed.classList.remove('medium-zoom-image--opened');
+        if (active.template) {
+          document.body.removeChild(active.template);
+        }
+
+        isAnimating = false;
+        active.zoomed.removeEventListener('transitionend', _handleCloseEnd);
+
+        active.original.dispatchEvent(createCustomEvent('medium-zoom:closed', {
+          detail: { zoom: zoom }
+        }));
+
+        active.original = null;
+        active.zoomed = null;
+        active.zoomedHd = null;
+        active.template = null;
+
+        resolve(zoom);
+      };
+
+      isAnimating = true;
+      document.body.classList.remove('medium-zoom--opened');
+      active.zoomed.style.transform = '';
+
+      if (active.zoomedHd) {
+        active.zoomedHd.style.transform = '';
+      }
+
+      // Fade out the template so it's not too abrupt
+      if (active.template) {
+        active.template.style.transition = 'opacity 150ms';
+        active.template.style.opacity = 0;
+      }
+
+      active.original.dispatchEvent(createCustomEvent('medium-zoom:close', {
+        detail: { zoom: zoom }
+      }));
+
+      active.zoomed.addEventListener('transitionend', _handleCloseEnd);
+    });
+  };
+
+  var toggle = function toggle() {
+    var _ref3 = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {},
+        target = _ref3.target;
+
+    if (active.original) {
+      return close();
+    }
+
+    return open({ target: target });
+  };
+
+  var getOptions = function getOptions() {
+    return zoomOptions;
+  };
+
+  var getImages = function getImages() {
+    return images;
+  };
+
+  var getZoomedImage = function getZoomedImage() {
+    return active.original;
+  };
+
+  var images = [];
+  var eventListeners = [];
+  var isAnimating = false;
+  var scrollTop = 0;
+  var zoomOptions = options;
+  var active = {
+    original: null,
+    zoomed: null,
+    zoomedHd: null,
+    template: null
+
+    // If the selector is omitted, it's replaced by the options
+  };if (Object.prototype.toString.call(selector) === '[object Object]') {
+    zoomOptions = selector;
+  } else if (selector || typeof selector === 'string' // to process empty string as a selector
+  ) {
+      attach(selector);
+    }
+
+  // Apply the default option values
+  zoomOptions = _extends({
+    margin: 0,
+    background: '#fff',
+    scrollOffset: 40,
+    container: null,
+    template: null
+  }, zoomOptions);
+
+  var overlay = createOverlay(zoomOptions.background);
+
+  document.addEventListener('click', _handleClick);
+  document.addEventListener('keyup', _handleKeyUp);
+  document.addEventListener('scroll', _handleScroll);
+  window.addEventListener('resize', close);
+
+  var zoom = {
+    open: open,
+    close: close,
+    toggle: toggle,
+    update: update,
+    clone: clone,
+    attach: attach,
+    detach: detach,
+    on: on,
+    off: off,
+    getOptions: getOptions,
+    getImages: getImages,
+    getZoomedImage: getZoomedImage
+  };
+
+  return zoom;
+};
+
+function styleInject(css, ref) {
+  if ( ref === void 0 ) ref = {};
+  var insertAt = ref.insertAt;
+
+  if (!css || typeof document === 'undefined') { return; }
+
+  var head = document.head || document.getElementsByTagName('head')[0];
+  var style = document.createElement('style');
+  style.type = 'text/css';
+
+  if (insertAt === 'top') {
+    if (head.firstChild) {
+      head.insertBefore(style, head.firstChild);
+    } else {
+      head.appendChild(style);
+    }
+  } else {
+    head.appendChild(style);
+  }
+
+  if (style.styleSheet) {
+    style.styleSheet.cssText = css;
+  } else {
+    style.appendChild(document.createTextNode(css));
+  }
+}
+
+var css = ".medium-zoom-overlay{position:fixed;top:0;right:0;bottom:0;left:0;opacity:0;transition:opacity .3s;will-change:opacity}.medium-zoom--opened .medium-zoom-overlay{cursor:pointer;cursor:zoom-out;opacity:1}.medium-zoom-image{cursor:pointer;cursor:zoom-in;transition:transform .3s cubic-bezier(.2,0,.2,1)!important}.medium-zoom-image--hidden{visibility:hidden}.medium-zoom-image--opened{position:relative;cursor:pointer;cursor:zoom-out;will-change:transform}";
+styleInject(css);
+
+export default mediumZoomEsm;

wowchemy/assets/js/wowchemy.js

@@ -5,10 +5,9 @@
  *  Core JS functions and initialization.
  **************************************************/
 
+import mediumZoom from './_vendor/medium-zoom.esm';
 import {hugoEnvironment, codeHighlighting, searchEnabled} from '@params';
-
 import {fixMermaid, scrollParentToChild} from './wowchemy-utils';
-
 import {
   changeThemeModeClick,
   initThemeVariation,
@@ -470,6 +469,15 @@ $(window).on('load', function () {
     scrollParentToChild(parent, child);
   }
 
+  // Enable images to be zoomed.
+  let zoomOptions = {};
+  if (document.body.classList.contains('dark')) {
+    zoomOptions.background = 'rgba(0,0,0,0.9)';
+  } else {
+    zoomOptions.background = 'rgba(255,255,255,0.9)';
+  }
+  mediumZoom('[data-zoomable]', zoomOptions);
+
   // Init Isotope Layout Engine for instances of the Portfolio widget.
   let isotopeCounter = 0;
   isotopeInstances.forEach(function (isotopeInstance, index) {

wowchemy/assets/scss/wowchemy/elements/_media.scss

@@ -1,3 +1,12 @@
+/*************************************************
+ *  Image zooming.
+ **************************************************/
+
+.medium-zoom-overlay,
+.medium-zoom-image--opened {
+  z-index: 1031; // Nav bar index +1.
+}
+
 /*************************************************
  *  Gallery.
  **************************************************/

wowchemy/layouts/partials/site_head.html

@@ -85,7 +85,10 @@
       {{ printf "<link rel=\"stylesheet\" href=\"%s\" integrity=\"%s\" crossorigin=\"anonymous\">" (printf $css.academicons.url $css.academicons.version) $css.academicons.sri | safeHTML }}
     {{ end }}
     {{ printf "<link rel=\"stylesheet\" href=\"%s\" integrity=\"%s\" crossorigin=\"anonymous\">" (printf $css.fontAwesome.url $css.fontAwesome.version) $css.fontAwesome.sri | safeHTML }}
-    {{ printf "<link rel=\"stylesheet\" href=\"%s\" integrity=\"%s\" crossorigin=\"anonymous\" media=\"print\" onload=\"this.media='all'\">" (printf $css.fancybox.url $css.fancybox.version) $css.fancybox.sri | safeHTML }}
+
+    {{ if .HasShortcode "gallery" }}
+      {{ printf "<link rel=\"stylesheet\" href=\"%s\" integrity=\"%s\" crossorigin=\"anonymous\" media=\"print\" onload=\"this.media='all'\">" (printf $css.fancybox.url $css.fancybox.version) $css.fancybox.sri | safeHTML }}
+    {{ end }}
 
     {{/* Default to disabling highlighting, but allow the user to override it in .Params or site.Params.
          Use $scr to store "highlight_enabled", so that we can read it again in footer.html. */}}

wowchemy/layouts/partials/site_js.html

@@ -6,6 +6,7 @@
       <script src="{{ printf "/js/vendor/%s" ($scr.Get "vendor_js_filename") | relURL }}"></script>
     {{ else }}
       {{ printf "<script src=\"%s\" integrity=\"%s\" crossorigin=\"anonymous\"></script>" (printf $js.jQuery.url $js.jQuery.version) $js.jQuery.sri | safeHTML }}
+      {{ printf "<script src=\"%s\" integrity=\"%s\" crossorigin=\"anonymous\"></script>" (printf $js.instantpage.url $js.instantpage.version) $js.instantpage.sri | safeHTML }}
 
       {{ $require_isotope := site.Params.require_isotope | default true }}
       {{ if $require_isotope }}
@@ -13,8 +14,9 @@
         {{ printf "<script src=\"%s\" integrity=\"%s\" crossorigin=\"anonymous\"></script>" (printf $js.isotope.url $js.isotope.version) $js.isotope.sri | safeHTML }}
       {{ end }}
 
-      {{ printf "<script src=\"%s\" integrity=\"%s\" crossorigin=\"anonymous\"></script>" (printf $js.fancybox.url $js.fancybox.version) $js.fancybox.sri | safeHTML }}
-      {{ printf "<script src=\"%s\" integrity=\"%s\" crossorigin=\"anonymous\"></script>" (printf $js.instantpage.url $js.instantpage.version) $js.instantpage.sri | safeHTML }}
+      {{ if .HasShortcode "gallery" }}
+        {{ printf "<script src=\"%s\" integrity=\"%s\" crossorigin=\"anonymous\"></script>" (printf $js.fancybox.url $js.fancybox.version) $js.fancybox.sri | safeHTML }}
+      {{ end }}
 
       {{ if or .Params.diagram site.Params.diagram }}
         {{ printf "<script src=\"%s\" integrity=\"%s\" crossorigin=\"anonymous\" title=\"mermaid\"></script>" (printf $js.mermaid.url $js.mermaid.version) $js.mermaid.sri | safeHTML }}

wowchemy/layouts/shortcodes/figure.html

@@ -1,55 +1,47 @@
-{{/* Enable image to be loaded from local page dir or media library at `static/media/`. */}}
+{{/* Figure Shortcode for Wowchemy. */}}
+{{/* Load image from page dir falling back to media library at `assets/images/` and then to remote URI. */}}
 
-{{ $media_dir := site.Params.media_dir | default "media" }}
-{{ $asset := (.Page.Resources.ByType "image").GetMatch (.Get "src") }}
-{{ $is_svg := false }}
-{{ if $asset }}
-  {{ if eq $asset.MediaType.SubType "svg"}}
-    {{ $is_svg = true }}
-  {{ end }}
-{{ end }}
-{{ $image_src := (.Get "src") }}
-{{ if and $asset (not $is_svg) }}
-  {{ $asset2 := $asset.Fit "2000x2000" }}
-  {{ $image_src = $asset2.RelPermalink }}
-{{ else if .Get "library" }}
-  {{ $image_src = printf "%s/%s" $media_dir $image_src | relURL }}
-{{ end }}
-
-{{/* Disallow user from opening image in the lightbox? */}}
-{{ $lightbox := eq (.Get "lightbox" | default "true") "true" }}
-
-{{/* Get lightbox group for showing multiple images in a lightbox. */}}
-{{ $group := .Get "lightbox-group" | default "" }}
-
-{{/* Get caption. Support legacy `title` option. */}}
+{{ $destination := .Get "src" }}
 {{ $caption := .Get "title" | default (.Get "caption") | default "" }}
-
-<figure{{ with .Get "class" }} class="{{.}}"{{ end }} {{ with $caption }}id="figure-{{ anchorize . }}"{{ end }}>
-
-{{ if $lightbox }}
-  <a data-fancybox="{{$group}}" href="{{$image_src}}" {{ with $caption }}data-caption="{{ .|markdownify|emojify|safeHTMLAttr }}"{{ end }}>
-{{ else if .Get "link"}}
-  <a href="{{ .Get "link" }}"{{ with .Get "target" }} target="{{.}}"{{ end }}{{ with .Get "rel" }} rel="{{.}}"{{ end }}>
-{{ end -}}
-
-{{/* Lazy load only when we know image dimensions in order to preserve anchor linking. */}}
-{{ if and $asset (not $is_svg) }}
-  <img data-src="{{$image_src}}" class="lazyload" alt="{{ with .Get "alt" }}{{.}}{{end}}" width="{{ (.Get "width") | default $asset.Width }}" height="{{ (.Get "height") | default $asset.Height }}">
-{{ else if and (.Get "width") (.Get "height") }}
-  <img data-src="{{$image_src}}" class="lazyload" alt="{{ with .Get "alt" }}{{.}}{{end}}" {{ with .Get "width" }}width="{{.}}"{{end}} {{ with .Get "height" }}height="{{.}}"{{end}}>
-{{ else }}
-  <img src="{{$image_src}}" alt="{{ with .Get "alt" }}{{.}}{{end}}" {{ with .Get "width" }}width="{{.}}"{{end}} {{ with .Get "height" }}height="{{.}}"{{end}}>
-{{ end }}
-
-{{- if or $lightbox (.Get "link") }}</a>{{ end }}
-
-{{ if $caption }}
-  {{/* Localize the figure numbering (if enabled). */}}
-  {{ $figure := split (i18n "figure" | default "Figure %d:") "%d" }}
-  <figcaption{{ if eq (.Get "numbered") "true" }} data-pre="{{- trim (index $figure 0) " " -}}&nbsp;" data-post="{{ index $figure 1 }}&nbsp;" class="numbered"{{ end }}>
-    {{ $caption | markdownify | emojify }}
-  </figcaption>
-{{ end }}
-
+{{ $id := .Get "id" | default $caption }}
+{{ $alt := .Get "alt" | default ($caption | plainify) }}
+
+{{- $img := (.Page.Resources.ByType "image").GetMatch $destination -}}
+{{- if and (not $img) .Page.File -}}
+  {{ $path :=  $destination }}
+  {{- $img = resources.Get (path.Join "images" $path) -}}
+{{- end -}}
+
+<figure {{ with .Get "class" }}class="{{.}}"{{ end }} {{ with $id }}id="figure-{{ anchorize . }}"{{ end }}>
+
+  {{- if $img -}}
+    {{ $isSVG := eq $img.MediaType.SubType "svg" }}
+    {{ if $isSVG }}
+      {{ $img.Content | safeHTML }}
+    {{ else }}
+      {{- $img_lg := $img.Fit "1200x1200" -}}
+      {{- $img_md := $img_lg.Fit "760x760" -}}{{/* Match `.docs-article-container` max-width */}}
+      {{- $img_sm := $img_md.Fit "400x400" -}}
+      <img alt="{{ $alt }}" srcset="
+           {{ $img_sm.RelPermalink }} 400w,
+           {{ $img_md.RelPermalink }} 760w,
+           {{ $img_lg.RelPermalink }} 1200w"
+           src="{{ $img_sm.RelPermalink }}"
+           width="{{ (.Get "width") | default $img_md.Width }}"
+           height="{{ (.Get "height") | default $img_md.Height }}"
+           loading="lazy"
+           data-zoomable />
+    {{ end }}
+  {{- else -}}
+    <img src="{{ $destination | safeURL }}" alt="{{ $alt }}" loading="lazy" data-zoomable
+         {{ with .Get "width" }}width="{{.}}"{{end}} {{ with .Get "height" }}height="{{.}}"{{end}} />
+  {{- end -}}
+
+  {{ if $caption }}
+    {{/* Localize the figure numbering (if enabled). */}}
+    {{ $figure := split (i18n "figure" | default "Figure %d:") "%d" }}
+    <figcaption{{ if eq (.Get "numbered") "true" }} data-pre="{{- trim (index $figure 0) " " -}}&nbsp;" data-post="{{ index $figure 1 }}&nbsp;" class="numbered"{{ end }}>
+      {{ $caption | markdownify | emojify }}
+    </figcaption>
+  {{ end }}
 </figure>

yarn.lock

@@ -1269,6 +1269,11 @@ mdast-util-to-string@^2.0.0:
   resolved "https://registry.yarnpkg.com/mdast-util-to-string/-/mdast-util-to-string-2.0.0.tgz#b8cfe6a713e1091cb5b728fc48885a4767f8b97b"
   integrity sha512-AW4DRS3QbBayY/jJmD8437V1Gombjf8RSOUCMFBuo5iHi58AGEgVCKQ+ezHkZZDpAQS75hcBMpLqjpJTjtUL7w==
 
+medium-zoom@^1.0.6:
+  version "1.0.6"
+  resolved "https://registry.yarnpkg.com/medium-zoom/-/medium-zoom-1.0.6.tgz#9247f21ca9313d8bbe9420aca153a410df08d027"
+  integrity sha512-UdiUWfvz9fZMg1pzf4dcuqA0W079o0mpqbTnOz5ip4VGYX96QjmbM+OgOU/0uOzAytxC0Ny4z+VcYQnhdifimg==
+
 meow@^8.0.0:
   version "8.1.2"
   resolved "https://registry.yarnpkg.com/meow/-/meow-8.1.2.tgz#bcbe45bda0ee1729d350c03cffc8395a36c4e897"