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'use strict'
const fs = require('fs')
const path = require('path')
const matter = require('gray-matter')
const Markdown = require('markdown-it')
const grayMatterOptions = {
lang: 'toml',
delims: '+++'
}
const markdownOptions = {
html: true,
typographer: true
}
const markdown = new Markdown(markdownOptions)
function* lowercaseKeys (iterator) {
for (let [k, v] of iterator) {
yield [String(k).toLowerCase(), v]
}
}
function canonicaliseMetadata (meta) {
if (meta.data) {
meta.data = new Map(lowercaseKeys(Object.entries(meta.data)))
} else {
meta.data = new Map()
}
return meta
}
function getTitle (file) {
return path.basename(file.path, path.extname(file.path))
}
function render (post) {
return markdown.render(post.content)
}
function get (filename) {
const fileMatter = matter.read(filename, grayMatterOptions)
fileMatter.basename = getTitle(fileMatter)
return canonicaliseMetadata(fileMatter)
}
function getFolder (folder) {
return new Map(
fs
.readdirSync(folder)
.map(f => path.resolve(folder, f))
.map(get)
.map(f => [getTitle(f), f])
)
}
function taxonomise (taxonomies, posts) {
const taxons = new Map(Object.keys(taxonomies).map(t => [t, new Map()]))
for (let [, post] of posts) {
for (let [singularName, pluralName] of Object.entries(taxonomies)) {
if (post.data.has(pluralName)) {
for (let term of post.data.get(pluralName)) {
const current = taxons.get(singularName).get(term)
taxons
.get(singularName)
.set(term, current ? current.concat(post) : [post])
}
}
}
}
return taxons
}
function toTags (posts) {
return taxonomise({ tag: 'tags' }, posts).get('tag')
}
module.exports = {
get,
getFolder,
toTags,
taxonomise,
render
}
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