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'use strict'
const fs = require('fs')
const path = require('path')
const matter = require('gray-matter')
const options = {
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 readFileMetadata (filename) {
return canonicaliseMetadata(matter.read(filename, options))
}
function getFileMetadata (filename) {
const result = readFileMetadata(filename)
return result && result.data
}
function getFolderMetadata (folder) {
return fs
.readdirSync(folder)
.map(f => path.resolve(folder, f))
.map(readFileMetadata)
}
module.exports = {
getFileMetadata,
getFolderMetadata
}
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