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content-collections.ts
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content-collections.ts
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import { parse } from "node:path";
import crypto from "node:crypto";
import { access, mkdir, readFile, writeFile } from "node:fs/promises";
import { codeToHast } from "shiki";
import {
transformerNotationDiff,
} from "@shikijs/transformers";
import sharp from "sharp";
import type * as H from "hast";
import { defineCollection, defineConfig } from "@content-collections/core";
import { unified } from "unified";
import { Temporal } from "temporal-polyfill";
import remarkGfm from "remark-gfm";
import remarkParse from "remark-parse";
import remarkRetext from "remark-retext";
import retextEnglish from "retext-english";
import retextEquality from "retext-equality";
import retextStringify from "retext-stringify";
import type * as A from "./src/libs/plugins/ast/ast";
import { remarkEmbed } from "./src/libs/plugins/remark/remarkEmbed";
import { remarkDescriptionList } from "./src/libs/plugins/remark/remarkDescriptionList";
import { astTransform } from "./src/libs/plugins/ast/transform";
import { astEmbed } from "./src/libs/plugins/ast/embed";
import { astSection } from "./src/libs/plugins/ast/section";
import { astToc } from "./src/libs/plugins/ast/toc";
import { astArticle } from "./src/libs/plugins/ast/article";
import { astDescriptionList } from "./src/libs/plugins/ast/descriptionList";
interface TransformedImage {
dim: {
h: number;
w: number;
};
path: string;
}
export interface WithTransformedImage {
transformed?: Array<TransformedImage>;
}
interface ImageTransformationConfig {
readonly outputRoot: string;
readonly outputSubDir: string;
readonly scaling: number;
readonly sourceBaseDir: string;
}
interface TransformContext {
readonly filePath: string;
}
function isAbslutePath(imgUrl: string): boolean {
return /^https?:\/\//.test(imgUrl) || imgUrl.startsWith("/");
}
function srcImgPath(
config: ImageTransformationConfig,
ctx: TransformContext,
imgUrl: string,
): string {
if (isAbslutePath(imgUrl))
return imgUrl;
const contentDir = /^.+$/.exec(config.sourceBaseDir)?.[0];
if (contentDir === undefined)
return imgUrl;
const srcPath = parse(ctx.filePath);
if (srcPath.dir === "")
return `${contentDir}/${imgUrl}`;
else
return `${contentDir}/${srcPath.dir}/${imgUrl}`;
}
function generateImgDistFileName(
imgUrl: string,
dim?: {
height: number;
width: number;
},
) {
if (isAbslutePath(imgUrl))
return imgUrl;
const baseNameHash = crypto
.createHash("sha256")
.update(imgUrl)
.digest("base64")
.slice(0, 8);
const baseName = parse(imgUrl).name;
if (dim)
return `${baseName}-${baseNameHash}-${Math.round(dim.width)}x${Math.round(dim.height)}.webp`;
else
return `${baseName}-${baseNameHash}.webp`;
}
async function exists(path: string): Promise<boolean> {
try {
await access(path);
return true;
}
catch {
return false;
}
}
async function traverseMdAst<T extends A.Content>(
config: ImageTransformationConfig,
ctx: TransformContext,
ast: T,
) {
switch (ast.type) {
case "code":
if (ast.lang) {
const styled = await codeToHast(ast.value, {
lang: ast.lang,
theme: "vitesse-dark",
transformers: [
transformerNotationDiff(),
{
pre(node) {
node.properties.style = "color: #dbd7cacc;";
},
},
],
});
// @ts-expect-error - This is a safty cast
(ast as unknown as { hast: H.Root }).hast = styled;
}
return;
case "break":
case "html":
case "footnoteReference":
case "inlineCode":
case "text":
case "thematicBreak":
case "embed":
return;
case "image": {
if (
ast.url.startsWith("https://")
|| ast.url.startsWith("http://")
|| ast.url.startsWith("/")
) {
return;
}
const buffer = await readFile(srcImgPath(config, ctx, ast.url));
const image = sharp(buffer);
let { height, width } = await image.metadata();
if (!(width && height))
return;
const images: TransformedImage[] = [];
while (width > 300) {
const fileName = generateImgDistFileName(ast.url, { height, width });
const distPath = `${config.outputSubDir}/${fileName}`;
const distPathOnFs = `${config.outputRoot}/${distPath}`;
if (!(await exists(distPathOnFs))) {
const resized = await image
.resize(Math.round(width), Math.round(height))
.toBuffer();
await writeFile(distPathOnFs, resized);
// eslint-disable-next-line no-console
console.log(`INFO: transformed markdown image: ${fileName}`);
}
images.push({
dim: {
h: Math.round(height),
w: Math.round(width),
},
path: `/${distPath}`,
});
width *= config.scaling;
height *= config.scaling;
}
(ast as WithTransformedImage).transformed = images;
return;
}
default:
await Promise.all(
ast.children.map(child => traverseMdAst(config, ctx, child)),
);
}
}
async function generateImages(
config: ImageTransformationConfig,
ctx: TransformContext,
ast: A.Article,
) {
await mkdir(`${config.outputRoot}/${config.outputSubDir}`, {
recursive: true,
});
await Promise.all(
ast.children.map(child => traverseMdAst(config, ctx, child)),
);
}
const blog = defineCollection({
directory: "contents",
include: "**/*.md",
name: "blog",
schema: z => ({
description: z.string({ message: "Value of \"description\" must be a string." }),
published: z.boolean({ message: "Value of \"published\" must be a boolean." }),
publishedAt: z.string({ message: "Value of \"publishedAt\" must be a date." }).refine((v) => {
try {
Temporal.ZonedDateTime.from(v);
return true;
}
catch {
return false;
}
}, { message: "Value of \"publishedAt\" must be a valid date." }),
tags: z.array(z.string(), { message: "Value of \"tags\" must be an array of strings." }),
title: z.string({ message: "Value of \"title\" must be a string." }),
updatedAt: z.string({ message: "Value of \"updatedAt\" must be a date." }).refine((v) => {
try {
Temporal.ZonedDateTime.from(v);
return true;
}
catch {
return false;
}
}, { message: "Value of \"updatedAt\" must be a valid date." }).optional(),
}),
transform: async (document) => {
const processor = unified()
.use(remarkParse)
.use(remarkGfm)
.use(remarkEmbed)
.use(remarkDescriptionList)
.use(astTransform)
.use(astDescriptionList)
.use(astEmbed)
.use(astSection)
.use(astToc)
.use(astArticle)
.freeze();
const mdast = await processor.run(processor.parse(document.content));
const config = {
outputRoot: "public",
outputSubDir: "img",
scaling: 0.7,
sourceBaseDir: "contents",
};
const ctx = {
filePath: document._meta.filePath,
};
await generateImages(config, ctx, mdast);
const abstract = await unified()
.use(remarkParse)
.use(
remarkRetext,
unified().use(retextEnglish).use(retextEquality) as any,
)
.use(retextStringify)
.process(document.content);
return {
...document,
abstract: String(abstract).slice(0, 400),
mdast: mdast as any, // MEMO: This cast is an escape hatch for serializable type
};
},
});
export default defineConfig({
collections: [blog],
});