112 lines
3.4 KiB
JavaScript
112 lines
3.4 KiB
JavaScript
const fs = require("fs");
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const path = require("path");
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const escape = require("escape-html");
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const TOKENS_EXT = /\.tokens\.json$/;
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// https://developer.mozilla.org/en-US/docs/Web/Media/Formats
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const IMG_EXT = (exports.IMG_EXT = /\.(apng|avif|gif|jpg|jpeg|jfif|pjpeg|pjp|png|svg|webp)$/);
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const AUDIO_EXT = (exports.AUDIO_EXT = /\.(mp3|wav|aac|aacp|mpeg|off|flac)$/);
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const VIDEO_EXT = (exports.VIDEO_EXT = /\.(mp4|webm)$/);
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const BASE_STYLE = (exports.BASE_STYLE =
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"<style>p,a,pre,h1,h2,h3,ul,blockquote,img,audio,video{display:block;max-width:100%;margin:0;padding:0;overflow-wrap:anywhere;}</style>");
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const GMI_CSS = fs.readFileSync(
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path.resolve(__dirname, "./gmi.min.css"),
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"utf8"
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);
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const toHTML = (exports.toHTML = (file, options) => {
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const tokens = JSON.parse(file.contents.toString("utf8"));
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const title = tokens[0].h1;
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return `<!DOCTYPE html>
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<html style="${options.override}">
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${head(file.path, title, options)}<body>
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${gemtext(tokens, options)}
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</body>
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</html>
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`;
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});
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module.exports = (options) => (file, cb) => {
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if (!TOKENS_EXT.test(file.path)) return cb(null);
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file.contents = Buffer.from(toHTML(file, options));
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file.path = file.path.replace(TOKENS_EXT, ".html");
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if (options.verbose) console.log(file.path);
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return cb(null, file);
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};
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function head(file, title, options) {
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return `<head>
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<meta charset="utf-8">
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<meta language="${options.language}">
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<meta name="viewport" content="width=device-width,initial-scale=1">${
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!options.css
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? BASE_STYLE
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: `\n<meta name="color-scheme" content="dark light">\n<style>${GMI_CSS}</style>`
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}${
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!options.canonical
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? ""
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: `<link rel="canonical" href="gemini://${
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options.canonical
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}/${file.replace(TOKENS_EXT, ".gmi")}">`
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}
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<title>${title}</title>
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</head>
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`;
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}
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function gemtext(tokens, options) {
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let body = [];
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let cursor = tokens.shift();
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while (tokens.length) {
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if (cursor.pre) {
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body.push(`<pre${cursor.alt ? ` title="${cursor.alt}"` : ""}>`);
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const closing = tokens.findIndex((token) => token.pre);
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body = body.concat(tokens.slice(0, closing).map(({ text }) => text));
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body.push("</pre>");
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tokens = tokens.slice(closing + 1);
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} else if (cursor.li) {
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body.push(`<ul>`);
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const closing = tokens.findIndex((token) => !token.li);
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body = body
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.concat([line(cursor)])
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.concat(tokens.slice(0, closing).map(line));
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body.push("</ul>");
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tokens = tokens.slice(closing);
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} else {
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body.push(line(cursor, options));
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}
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cursor = tokens.shift();
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}
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return body.join("\n");
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}
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function line(
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{ text, href, title, pre, alt, h1, h2, h3, li, quote },
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{ images, audio, video } = {}
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) {
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if (text) return `<p>${escape(text)}</p>`;
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if (href) {
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if (images && IMG_EXT.test(href))
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return `<img src="${href}" title="${title}"/>`;
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if (audio && AUDIO_EXT.test(href))
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return `<audio controls src="${href}" title="${title}"></audio>`;
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if (video && VIDEO_EXT.test(href))
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return `<video controls src="${href}" title="${title}"/></video>`;
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return `<a href="${href}">${title ? escape(title) : href}</a>`;
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}
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if (h1) return `<h1>${escape(h1)}</h1>`;
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if (h2) return `<h2>${escape(h2)}</h2>`;
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if (h3) return `<h3>${escape(h3)}</h3>`;
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if (li) return `<li>${escape(li)}</li>`;
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if (quote) return `<blockquote>${escape(quote)}</blockquote>`;
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return `<p><br></p>`;
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}
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function omit(key, obj) {
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const { [key]: omitted, ...rest } = obj;
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return rest;
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}
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