130 lines
3.9 KiB
JavaScript
130 lines
3.9 KiB
JavaScript
import escape from "escape-html";
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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>(.+)?))$/;
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const truncate = (text, limit) =>
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text.length > limit ? `${text.substring(0, limit)}...` : text;
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export function html(file, options) {
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const tokens = file.contents
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.toString("utf8")
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.split("\n")
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.map((line) => GMI_REGEX.exec(line).groups);
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let description = options.descriptions
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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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return `<!DOCTYPE html>
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<html lang="${options.language}" dir="${options.dir}" style="${options.styles}">
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<head>${head(
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Object.assign(options, {
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title: tokens[0].h1,
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description: description && truncate(description.text, 200),
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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">${
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options.css && options.css !== ""
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? `<meta name="color-scheme" content="dark light">`
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: ""
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}${options.css && options.css !== "" ? `<style>${options.css}</style>` : ""}
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<title>${options.title}</title>${
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!options.author ? "" : `<meta name="author" content="${options.author}">`
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}${
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!options.description
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? ""
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: `<meta name="description" content="${escape(options.description)}">`
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}${
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!options.canonical
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? ""
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: `<link rel="canonical" href="${options.canonical}">`
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}
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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 = body && css ? ` 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}"${FIX_NORMAL_FLOW}>${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>${escape(quote)}</blockquote>`;
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return `<p><br></p>`;
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}
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export function body(tokens, options) {
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let lines = [];
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let cursor = tokens.shift();
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while (tokens.length) {
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if (cursor.pre) {
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lines.push(`<pre${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 default (options) => (file, cb) => {
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if (!GMI_EXT.test(file.path)) return cb(null);
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file.contents = Buffer.from(html(file, options));
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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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