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function sprongulate() {
// Since GitHub is an SPA, we can't limit ourselves to only loading on
// Nixpkgs PRs, as synthetic browser navigation doesn't trigger content
// script loading. Thus, we have to load on any GitHub URL, rerun on
// navigation, and ensure we're on a Nixpkgs PR before continuing.
const [, NixOS, nixpkgs, pull, number] = new URL(window.location.href).pathname.split('/')
if (NixOS !== 'NixOS' || nixpkgs !== 'nixpkgs' || pull !== 'pull') return
// There are (at the time of writing) two contexts in which the PR
// number is visible:
//
// 1. In the header (following the PR title).
// 2. Sufficiently far down that the header is no longer visible (at
// which point the header shrinks and affixes itself to the top of
// the page).
//
// These are actually two distinct elements: the visibility of each
// is dependent on your scroll position. They also have completely
// different (and nondescript) CSS selectors, so instead of looking
// for them directly, we locate the immediately preceding PR title
// element (which *does* have a common CSS selector), to find them.
for (let node of document.querySelectorAll('.js-issue-title')) {
node = node.nextElementSibling
const a = document.createElement('a')
a.setAttribute('href', `https://nixpk.gs/pr-tracker.html?pr=${number}`)
node.replaceWith(a)
a.appendChild(node)
}
}
// Once on first page load...
sprongulate()
// ...and once every time there is new page content.
document.addEventListener('turbo:render', sprongulate)
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