const fs = require("fs");
const path = require("path");
const TOKENS_EXT = /\.tokens\.json$/;
// https://developer.mozilla.org/en-US/docs/Web/Media/Formats
const IMG_EXT = (exports.IMG_EXT = /\.(apng|avif|gif|jpg|jpeg|jfif|pjpeg|pjp|png|svg|webp)$/);
const AUDIO_EXT = (exports.AUDIO_EXT = /\.(mp3|wav|aac|aacp|mpeg|off|flac)$/);
const VIDEO_EXT = (exports.VIDEO_EXT = /\.(mp4|webm)$/);
const BASE_STYLE = (exports.baseStyle =
"");
const toHTML = (exports.toHTML = (file, options) => {
const tokens = JSON.parse(file.contents.toString("utf8"));
const title = tokens[0].h1;
return `
${head(file.path, title, options)}
${gemtext(tokens, options)}
`;
});
module.exports = (options) => (file, cb) => {
if (!TOKENS_EXT.test(file.path)) return cb(null);
file.contents = Buffer.from(toHTML(file, options));
file.path = file.path.replace(TOKENS_EXT, ".html");
if (options.verbose) console.log(file.path);
return cb(null, file);
};
// TODO: meta: language, description, canonical
function head(file, title, options) {
return `
${
!options.css
? BASE_STYLE
: `\n\n`
}${
!options.canonical
? ""
: ``
}
${title}
`;
}
function gemtext(tokens, options) {
let body = [];
let cursor = tokens.shift();
while (tokens.length) {
if (cursor.pre) {
body.push(``);
const closing = tokens.findIndex((token) => token.pre);
body = body.concat(tokens.slice(0, closing).map(({ text }) => text));
body.push("");
tokens = tokens.slice(closing + 1);
}
if (cursor.li) {
body.push(``);
const closing = tokens.findIndex((token) => !token.li);
body = body.concat(tokens.slice(0, closing).map(line));
body.push("
");
tokens = tokens.slice(closing + 1);
}
body.push(line(cursor, options));
cursor = tokens.shift();
}
return body.join("\n");
}
function line(
{ text, href, title, pre, alt, h1, h2, h3, li, quote },
{ images, audio, video }
) {
if (text) return `${text}
`;
if (href) {
if (images && IMG_EXT.test(href))
return `
`;
if (audio && AUDIO_EXT.test(href))
return ``;
if (video && VIDEO_EXT.test(href))
return ``;
return `${title || href}`;
}
if (h1) return `${h1}
`;
if (h2) return `${h2}
`;
if (h3) return `${h3}
`;
if (li) return `${li}`;
if (quote) return `${quote}
`;
return `
`;
}
function omit(key, obj) {
const { [key]: omitted, ...rest } = obj;
return rest;
}