const {readFileSync} = require("fs")

const {basename} = require("path")

let [template, ...chapters] = process.argv.slice(2)

function esc(str) {

return str.replace(/[<>&"]/g, ch => ch == "<" ? "&lt;" : ch == ">" ? "&gt;" : ch == "&" ? "&amp;" : "&quot;")

}

let toc = ""

const section = /<h2\b[^>]*><a [^>]*?id="(h_.*?)".*?><\/a>(.*?)<\/h2>/g

for (let chapter of chapters) {

let text = readFileSync(chapter, "utf8")

let base = basename(chapter)

let title = /<h1.*?>(.*?)<\/h1>/.exec(text)[1]

toc += ` <li><a href="${base}">${esc(title)}</a>

<ol>\n`

for (let match; match = section.exec(text);)

toc += ` <li><a href="${base}#${match[1]}">${esc(match[2])}</a></li>\n`

toc += ` </ol>

</li>\n`

}

console.log(readFileSync(template, "utf8").replace("{{full_toc}}", toc))