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'use strict'
const fs = require('fs')
const path = require('path')
const matter = require('gray-matter')
const grayMatterOptions = {
lang: 'toml',
delims: '+++'
}
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 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 toTags (posts) {
const tags = new Map()
for (let [, post] of posts) {
if (post.data.has('tags')) {
for (let tag of post.data.get('tags')) {
tags.set(tag, (tags.get(tag) || []).concat([post]))
}
}
}
return tags
}
module.exports = {
get,
getFolder,
toTags
}
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