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const wrap = (figures: HTMLElement[]) => {
const galleryContainer = document.createElement('div');
galleryContainer.className = 'gallery';
const parentNode = figures[0].parentNode,
first = figures[0];
parentNode.insertBefore(galleryContainer, first)
for (const figure of figures) {
galleryContainer.appendChild(figure);
}
}
export default (container: HTMLElement) => {
/// The process of wrapping image with figure tag is done using JavaScript instead of only Hugo markdown render hook
/// because it can not detect whether image is being wrapped by a link or not
/// and it lead to a invalid HTML construction (<a><figure><img></figure></a>)
const images = container.querySelectorAll('img.gallery-image') as NodeListOf<HTMLImageElement>;
for (const img of Array.from(images)) {
/// Images are wrapped with figure tag if the paragraph has only images without texts
/// This is done to allow inline images within paragraphs
const paragraph = img.closest('p');
if (!paragraph || !container.contains(paragraph)) continue;
if (paragraph.textContent.trim() == '') {
/// Once we insert figcaption, this check no longer works
/// So we add a class to paragraph to mark it
paragraph.classList.add('no-text');
}
let isNewLineImage = paragraph.classList.contains('no-text');
if (!isNewLineImage) continue;
const hasLink = img.parentElement.tagName == 'A';
let el: HTMLElement = img;
/// Wrap image with figure tag, with flex-grow and flex-basis values extracted from img's data attributes
const figure = document.createElement('figure');
figure.style.setProperty('flex-grow', img.getAttribute('data-flex-grow') || '1');
figure.style.setProperty('flex-basis', img.getAttribute('data-flex-basis') || '0');
if (hasLink) {
/// Wrap <a> if it exists
el = img.parentElement;
}
el.parentElement.insertBefore(figure, el);
figure.appendChild(el);
/// Add figcaption if it exists
if (img.hasAttribute('alt')) {
const figcaption = document.createElement('figcaption');
figcaption.innerText = img.getAttribute('alt');
figure.appendChild(figcaption);
}
/// Wrap img tag with <a> tag if image was not wrapped by <a> tag
if (!hasLink) {
figure.className = 'gallery-image';
const a = document.createElement('a');
a.href = img.src;
a.setAttribute('target', '_blank');
a.setAttribute('data-pswp-width', img.width.toString());
a.setAttribute('data-pswp-height', img.height.toString());
img.parentNode.insertBefore(a, img);
a.appendChild(img);
}
}
const figuresEl = container.querySelectorAll('figure.gallery-image') as NodeListOf<HTMLElement>;
let currentGallery = [];
for (const figure of Array.from(figuresEl)) {
if (!currentGallery.length) {
/// First iteration
currentGallery = [figure];
}
else if (figure.previousElementSibling === currentGallery[currentGallery.length - 1]) {
/// Adjacent figures
currentGallery.push(figure);
}
else if (currentGallery.length) {
/// End gallery
wrap(currentGallery);
currentGallery = [figure];
}
}
if (currentGallery.length > 0) {
wrap(currentGallery);
}
};
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