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site/render.js

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'use strict'
const pug = require('pug')
const marked = require('marked')
const fs = require('fs').promises
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const http = require('http')
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const unit = (...args) => null
const log = process.env.VERBOSE ? console.log : unit
const walk = async (path, filename) => {
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log('[walk]', path)
const type = await fs.lstat(path)
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if (type.isFile()) return {type: 'file', path: path, name: filename || path, tags:[]}
if (!type.isDirectory()) return null
const files = await fs.readdir(path)
return {
type: 'folder',
path: path,
name: filename || path,
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tags: [],
children: await Promise.all(files.map(file => walk(`${path}/${file}`, file)))
}
}
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const ext_static = ['.css', '.js', '.otf', '.png', '.svg', '.txt', '.png', '.jpg', '.webp', 'client', 'server', '.pdf', '.ttf', '.xml']
const ext_md = ['.md', '.markdown']
const ext_pug = ['.pug', '.jade']
const suffix = file => ext => file.substring(file.length - ext.length) == ext ? ext : null
const suffixl = (...l) => file => l.find(suffix(file))
const is_static = suffixl(...ext_static)
const is_md = suffixl(...ext_md)
const is_pug = suffixl(...ext_pug)
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const is_templated = f => is_md(f) /* || is_rst(f) */
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const is_document = f => is_templated(f) || is_pug(f)
const prefix = file => ext => file.substring(0, ext.length) == ext ? ext : null
const prefixl = (...l) => file => l.find(prefix(file))
const rm_prefix = (...l) => file => file.substring(prefixl(...l)(file).length)
const rm_suffix = (...l) => file => file.substring(0, file.length - suffixl(...l)(file).length)
const propagate_md_layout = (tree, markdown_template) => {
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if (tree.type == 'file' && is_templated(tree.name)) {
tree.template = markdown_template
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log('[propagate_md_layout]', tree ? tree.path : null, markdown_template ? markdown_template.path : null)
} else if (tree.type == 'folder') {
const find_md_tpl = tree.children.filter(c => c.type == 'file' && c.name == '_markdown.pug')
const new_md_tpl = find_md_tpl.length > 0 ? find_md_tpl[0] : markdown_template
tree.children.forEach(c => propagate_md_layout(c, new_md_tpl))
}
return tree
}
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const elagate = tree => {
if (tree.type != 'folder') return tree
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const lh = e => log('[elagate]', e.path) && false
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tree.children = tree.children.filter(e => !(e.name[0] == '_') || lh(e))
tree.children.forEach(elagate)
return tree
}
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const tag_document = tree => {
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if (tree.type == 'file' && is_document(tree.name) && tree.name[0] != '@') {
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tree.tags.push('document_leaf', 'document')
log('[tag_document]', tree.path, 'document_leaf')
} else if (tree.type == 'folder') {
tree.children.forEach(tag_document)
if(tree.children.some(c => c.tags.includes('document'))) {
tree.tags.push('document_branch', 'document')
log('[tag_document]', tree.path, 'document_branch')
}
}
return tree
}
const reference_index = indexes => tree => {
if (tree.type != 'folder') return tree;
const index = tree.children.find(e => indexes.includes(e.name))
if (index) {
tree.index = index
tree.tags.push('has_index')
log('[reference_index]', tree.path, index.name)
index.tags.push('is_index')
}
tree.children.forEach(reference_index(indexes))
return tree;
}
const propagate_nice_name = prefix => tree => {
const without_prefix = tree.path.substring(prefix.length)
const splitted = without_prefix.split('/').filter(v => v.length > 0)
if (splitted.length > 0) {
tree.nice_path = splitted.slice(0, -1)
tree.nice_name = splitted[splitted.length - 1].split('.')[0]
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tree.url = tree.type == 'folder' ? without_prefix + '/' : without_prefix
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log('[propagate_nice_name]', [...tree.nice_path, tree.nice_name].join('|'))
}
if (tree.type == 'folder') tree.children.forEach(propagate_nice_name(prefix))
return tree
}
const prepare_copy = (old_prefix, new_prefix, exts) => tree => {
if (tree.type == 'file' && is_static(tree.name)) {
tree.generate = {
cmd: 'copy',
src: tree.path,
out: new_prefix + rm_prefix(old_prefix)(tree.path)
}
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log('[prepare_copy]',tree.generate.src,'->',tree.generate.out)
} else if (tree.type == 'folder') {
tree.children.forEach(prepare_copy(old_prefix, new_prefix, exts))
}
return tree
}
const prepare_pug = (old_prefix, new_prefix) => tree => {
if (tree.type == 'file' && is_pug(tree.name)) {
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tree.old_url = tree.url
tree.url = rm_prefix(old_prefix)(rm_suffix(...ext_pug)(tree.path)) + '.html'
tree.generate = {
cmd: 'pug',
src: tree.path,
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out: new_prefix + tree.url
}
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log('[prepare_pug]',tree.generate.src,'->',tree.generate.out)
}
else if (tree.type == 'folder') {
tree.children.forEach(prepare_pug(old_prefix, new_prefix))
}
return tree
}
const prepare_md = (old_prefix, new_prefix) => tree => {
if (tree.type == 'file' && is_md(tree.name)) {
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tree.old_url = tree.url
tree.url = rm_prefix(old_prefix)(rm_suffix(...ext_md)(tree.path)) + '.html'
tree.generate = {
cmd: 'pug',
src: tree.template.path,
markdown: tree.path,
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out: new_prefix + tree.url
}
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log('[prepare_md]',tree.generate.markdown,'+',tree.generate.src,'->',tree.generate.out)
}
else if (tree.type == 'folder') {
tree.children.forEach(prepare_md(old_prefix, new_prefix))
}
return tree
}
const prepare_folder = (old_prefix, new_prefix) => tree => {
if (tree.type == 'folder') {
tree.generate = {
cmd: 'mkdir',
out: new_prefix + rm_prefix(old_prefix)(tree.path)
}
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log('[prepare_folder]',tree.generate.out)
tree.children.forEach(prepare_folder(old_prefix, new_prefix))
}
return tree
}
const do_folder = async tree => {
if (!tree.generate || tree.generate.cmd != 'mkdir') return tree
await fs.mkdir(tree.generate.out, { recursive: true })
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log('[do_folder]',tree.generate.out)
await Promise.all(tree.children.map(do_folder))
return tree
}
const do_copy = async tree => {
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if (tree.generate && tree.generate.cmd == 'copy') {
await fs.copyFile(tree.generate.src, tree.generate.out)
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log('[do_copy]',tree.generate.out)
} else if (tree.type == 'folder')
await Promise.all(tree.children.map(do_copy))
return tree
}
const do_pug = (prt, root) => async tree => {
prt = prt || tree
root = root || tree
if (tree.generate && tree.generate.cmd == 'pug') {
const html = pug.renderFile(tree.generate.src, {
markdown: tree.generate.markdown ? marked(await fs.readFile(tree.generate.markdown, 'utf-8')) : null,
root: root,
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prt: prt,
element: tree
})
await fs.writeFile(tree.generate.out, html)
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log('[do_pug]',tree.generate.out)
} else if (tree.type == 'folder')
await Promise.all(tree.children.map(do_pug(tree,root)))
return tree
}
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const rm_tree = t => {
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if (t == null) return
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if (t.type == 'file') {
log('[do_clean] file', t.path)
return fs.unlink(t.path)
}
return Promise
.all(t.children.map(rm_tree))
.then(_ => {
log('[do_clean] path', t.path)
return fs.rmdir(t.path)
})
}
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const do_clean = path => tree =>
walk(path)
.catch(_ => null)
.then(rm_tree)
.then(_ => tree)
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const listen = async t =>
process.env.LISTEN &&
http.createServer(async (req,res) => {
const file = fs.readFile(__dirname + '/static/' + decodeURI(req.url))
.catch(_ => fs.readFile(__dirname + '/static/' + decodeURI(req.url) + '/index.html'))
try {
const f = await file
res.writeHead(200)
res.end(f)
} catch (e) {
console.error(e)
res.writeHead(404)
res.end("404 not found")
}
}).listen(process.env.LISTEN);
const conf = { src: './src', dest: './static'}
walk(conf.src)
.then(propagate_md_layout)
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.then(elagate)
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.then(tag_document)
.then(reference_index(['index.md', 'index.pug']))
.then(propagate_nice_name(conf.src))
.then(prepare_copy(conf.src, conf.dest))
.then(prepare_pug(conf.src, conf.dest))
.then(prepare_md(conf.src, conf.dest))
.then(prepare_folder(conf.src, conf.dest))
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//.then(v => {log(v) ; return v})
.then(do_clean(conf.dest))
.then(do_folder)
.then(do_copy)
.then(do_pug())
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.then(listen)
.catch(console.error)