172 lines
5 KiB
JavaScript
172 lines
5 KiB
JavaScript
import fs from "fs";
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import map from "map-stream";
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import escape from "escape-html";
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import * as CSS from "./css.js";
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export const GMI_REGEX = /^((=>\s?(?<href>[^\s]+)(\s(?<title>.+))?)|(?<pre>```\s?(?<alt>.+)?)|(###\s?(?<h3>.+))|(##\s?(?<h2>.+))|(#\s?(?<h1>.+))|(\*\s?(?<li>.+))|(>\s?(?<quote>.+))|(?<text>(.+)?))$/;
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export function toHTML(gemtext, options) {
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const tokens = gemtext.split("\n").map((line) => GMI_REGEX.exec(line).groups);
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let description =
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options.descriptions > 0
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? tokens.find((token) => {
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return token.text && token.text !== "";
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})
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: false;
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if (options.body) return body(tokens, options);
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const truncate = (text, limit) =>
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text.length > limit ? `${text.substring(0, limit)}...` : text;
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function overrideStyles(options) {
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if (options.css !== "full") return "";
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const vars = CSS.rootVariables(CSS.FULL);
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return Object.keys(vars).reduce((styles, key) => {
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if (typeof options[key] !== undefined && options[key] !== vars[key]) {
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let value = options[key];
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if (["a-prefix", "ul-bullet"].includes(key) && value !== "none") {
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value = `"${value}"`;
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}
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styles += `--${key}:${value};`;
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}
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return styles;
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}, "");
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}
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return `<!DOCTYPE html>
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<html lang="${options.language}" dir="${options.dir}" style='${overrideStyles(
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options
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)}'>
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<head>${head(
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Object.assign(options, {
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title: tokens[0].h1,
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description:
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description && truncate(description.text, options.descriptions),
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})
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)}</head>
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<body>
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${body(tokens, options)}
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</body>
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</html>
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`;
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}
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export function head(options) {
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return `
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<meta charset="${options.charset}">
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<meta name="viewport" content="width=device-width,initial-scale=1">
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${
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options.schemes || options.css === "full"
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? `<meta name="color-scheme" content="dark light">\n`
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: ""
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}${style(options.css)}
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<title>${options.title}</title>${
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!options.author ? "" : `\n<meta name="author" content="${options.author}">`
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}${
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!options.description
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? ""
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: `\n<meta name="description" content="${escape(options.description)}">`
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}${
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!options.canonical
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? ""
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: `\n<link rel="canonical" href="${options.canonical}">`
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}
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`;
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}
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export function style(mode) {
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if (mode === "none") return "";
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if (mode === "core")
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return `<style>${CSS.stringify(CSS.CORE, { compress: true })}</style>`;
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if (mode === "full")
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return `<style>${CSS.stringify(CSS.FULL, { compress: true })}</style>`;
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if (fs.existsSync(mode)) {
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return `<style>${CSS.resolve(mode, { compress: true })}</style>`;
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} else {
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throw new Error(`Cannot find file ${mode}.`);
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}
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}
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function line(
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{ text, href, title, pre, alt, h1, h2, h3, li, quote },
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{ image, audio, video, css, body } = {}
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) {
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if (text) return `<p>${escape(text)}</p>`;
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if (href) {
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const titleProp = title ? ` title="${title}"` : "";
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const FIX_NORMAL_FLOW =
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body && css !== "none" ? ` style="display: block; max-width: 100%;"` : "";
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const matchesExt = (url, exts) =>
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exts.some((ext) => new RegExp(`\.${ext}$`).test(url));
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if (image && matchesExt(href, image)) {
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return `<img src="${href}"${titleProp}${FIX_NORMAL_FLOW}/>`;
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}
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if (audio && matchesExt(href, audio)) {
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return `<audio controls src="${href}"${titleProp}${FIX_NORMAL_FLOW}></audio>`;
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}
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if (video && matchesExt(href, video)) {
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return `<video controls src="${href}"${titleProp}${FIX_NORMAL_FLOW}/></video>`;
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}
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return `<a href="${href}"${FIX_NORMAL_FLOW}>${
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title ? escape(title) : href
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}</a>`;
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}
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if (h1) return `<h1>${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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export function body(tokens, options) {
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let lines = [];
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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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lines.push(`<pre${cursor.alt ? ` title="${cursor.alt}"` : ""}>`);
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const closing = tokens.findIndex((token) => token.pre);
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lines = lines.concat(tokens.slice(0, closing).map(({ text }) => text));
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lines.push("</pre>");
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tokens = tokens.slice(closing + 1);
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} else if (cursor.li) {
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lines.push(`<ul>`);
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const closing = tokens.findIndex((token) => !token.li);
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lines = lines
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.concat([line(cursor)])
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.concat(tokens.slice(0, closing).map(line));
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lines.push("</ul>");
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tokens = tokens.slice(closing);
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} else {
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lines.push(line(cursor, options));
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}
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cursor = tokens.shift();
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}
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return lines.join("\n");
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}
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export const GMI_EXT = /\.gmi$/;
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export function streamHTML(options) {
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return map((file, cb) => {
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if (!GMI_EXT.test(file.path)) return cb(null);
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file.contents = Buffer.from(
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toHTML(file.contents.toString("utf-8"), options)
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);
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file.path = file.path.replace(GMI_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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}
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