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