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<script>
(function () {
onReady(() => {
fixCgitMarkdownImages();
linkifyCgitSubtitles();
enhanceBlobPreview();
});
/**
* Runs a callback once the DOM is ready.
* @param {() => void} fn
*/
function onReady(fn) {
if (document.readyState === "loading") {
document.addEventListener("DOMContentLoaded", fn, { once: true });
} else {
fn();
}
}
/**
* Rewrites relative image URLs in cgit README ("about") pages
* to use /<repo>/plain/<path>, so images render correctly.
*/
function fixCgitMarkdownImages() {
const parts = location.pathname.split("/").filter(Boolean);
// Expected path: /<repo>/about/
if (parts[1] !== "about") return;
const baseUrl = `${location.origin}/${parts[0]}/plain/`;
const container = document.querySelector(".markdown-body");
if (!container) return;
container.querySelectorAll("img[src]").forEach(img => {
const src = img.getAttribute("src");
if (!isRelativeUrl(src)) return;
img.src = baseUrl + src.replace(/^\.?\//, "");
});
}
/**
* Converts plain-text URLs in repository subtitle cells
* (<td class="sub">) into clickable links.
*/
function linkifyCgitSubtitles() {
const urlRegex = /\bhttps?:\/\/[^\s<]+/g;
document.querySelectorAll("td.sub").forEach(sub => {
if (sub.querySelector("a")) return;
const text = sub.textContent;
if (!text || !urlRegex.test(text)) return;
urlRegex.lastIndex = 0;
sub.innerHTML = text.replace(urlRegex, url =>
`<a href="${url}" target="_blank" rel="noopener noreferrer">${url}</a>`
);
});
}
/**
* Replaces binary image hex dumps with rendered image previews.
* The hex dump is moved into a <details> block below the image.
*/
function enhanceBlobPreview() {
const content = document.querySelector("div.content");
const binBlob = document.querySelector("table.bin-blob");
const plainLink = document.querySelector('a[href*="/plain/"]');
if (!content || !binBlob || !plainLink) return;
const url = plainLink.getAttribute("href");
const ext = getFileExtension(url);
if (!isSupportedImage(ext)) {
binBlob.style.display = "table";
return;
}
const img = new Image();
img.src = url;
img.alt = "Rendered image";
img.onload = () => {
// Image preview
const preview = document.createElement("div");
preview.className = "cgit-image-preview";
preview.appendChild(img);
// Insert preview before hex dump
content.insertBefore(preview, binBlob);
// Wrap hex dump in <details>
const details = document.createElement("details");
details.className = "cgit-hexdump";
const summary = document.createElement("summary");
summary.textContent = "Show hex dump";
binBlob.style.display = "table";
details.appendChild(summary);
details.appendChild(binBlob);
content.appendChild(details);
};
}
/**
* Returns true if a URL is relative and safe to rewrite.
* @param {string|null} url
* @returns {boolean}
*/
function isRelativeUrl(url) {
return Boolean(
url &&
!url.startsWith("http://") &&
!url.startsWith("https://") &&
!url.startsWith("//") &&
!url.startsWith("data:") &&
!url.startsWith("#")
);
}
/**
* Extracts the lowercase file extension from a URL.
* @param {string} url
* @returns {string}
*/
function getFileExtension(url) {
return url.split(".").pop().toLowerCase();
}
/**
* Checks whether a file extension is a browser-renderable image.
* @param {string} ext
* @returns {boolean}
*/
function isSupportedImage(ext) {
return new Set([
"png", "jpg", "jpeg", "gif", "webp",
"bmp", "svg", "ico", "avif"
]).has(ext);
}
})();
</script>
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