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import { join } from "path";
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import rawURL from "./raw-url";
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interface Options {
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  id: string;
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  path: string;
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  relativePath: string;
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}
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// NOTE: there is a similar function in frontend/project/page/url-transform.ts
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export default function getUrlTransform({
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  id,
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  path,
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  relativePath, // relative path of the directory containing the file we are rendering.
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}: Options): (href: string, tag: string) => string | undefined {
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  return (href: string, tag: string) => {
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    if (href.startsWith("data:")) return; // never change data: urls in any way.
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    if (tag == "a" || href.includes("://")) {
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      // Don't modify anything non-local, i.e., like https://...
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      // Also don't modify a tags at all.
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      return;
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    }
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    return rawURL({ id, path, relativePath: join(relativePath, href) });
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  };
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}
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