import { FullSlug, isRelativeURL, resolveRelative, simplifySlug } from "../../util/path"
import { QuartzEmitterPlugin } from "../types"
import { write } from "./helpers"
import { BuildCtx } from "../../util/ctx"
import { VFile } from "vfile"
import path from "path"
async function* processFile(ctx: BuildCtx, file: VFile) {
const ogSlug = simplifySlug(file.data.slug!)
for (const aliasTarget of file.data.aliases ?? []) {
const aliasTargetSlug = (
isRelativeURL(aliasTarget)
? path.normalize(path.join(ogSlug, "..", aliasTarget))
: aliasTarget
) as FullSlug
const redirUrl = resolveRelative(aliasTargetSlug, ogSlug)
yield write({
ctx,
content: `
<!DOCTYPE html>
<html lang="en-us">
<head>
<title>${ogSlug}</title>
<link rel="canonical" href="${redirUrl}">
<meta name="robots" content="noindex">
<meta charset="utf-8">
<meta http-equiv="refresh" content="0; url=${redirUrl}">
</head>
</html>
`,
slug: aliasTargetSlug,
ext: ".html",
})
}
}
export const AliasRedirects: QuartzEmitterPlugin = () => ({
name: "AliasRedirects",
async *emit(ctx, content) {
for (const [_tree, file] of content) {
yield* processFile(ctx, file)
}
},
async *partialEmit(ctx, _content, _resources, changeEvents) {
for (const changeEvent of changeEvents) {
if (!changeEvent.file) continue
if (changeEvent.type === "add" || changeEvent.type === "change") {
// add new ones if this file still exists
yield* processFile(ctx, changeEvent.file)
}
}
},
})