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const { deeplyParseHeaders } = require('./parseHeaders')
exports.normalizeHeadTag = function (tag) {
if (typeof tag === 'string') {
tag = [tag]
}
const tagName = tag[0]
return {
tagName,
attributes: tag[1] || {},
innerHTML: tag[2] || '',
closeTag: !(tagName === 'meta' || tagName === 'link')
}
}
exports.applyUserWebpackConfig = function (userConfig, config, isServer) {
const merge = require('webpack-merge')
if (typeof userConfig === 'object') {
return merge(config, userConfig)
}
if (typeof userConfig === 'function') {
const res = userConfig(config, isServer)
if (res && typeof res === 'object') {
return merge(config, res)
}
}
return config
}
exports.inferTitle = function (frontmatter) {
if (frontmatter.data.home) {
return 'Home'
}
if (frontmatter.data.title) {
return deeplyParseHeaders(frontmatter.data.title)
}
const match = frontmatter.content.trim().match(/^#+\s+(.*)/m)
if (match) {
return deeplyParseHeaders(match[1])
}
}
exports.parseFrontmatter = function (content) {
const matter = require('gray-matter')
const toml = require('toml')
return matter(content, {
excerpt_separator: '<!-- more -->',
engines: {
toml: toml.parse.bind(toml),
excerpt: false
}
})
}
const LRU = require('lru-cache')
const cache = LRU({ max: 1000 })
exports.extractHeaders = function (content, include = [], md) {
const key = content + include.join(',')
const hit = cache.get(key)
if (hit) {
return hit
}
const tokens = md.parse(content, {})
const res = []
tokens.forEach((t, i) => {
if (t.type === 'heading_open' && include.includes(t.tag)) {
const title = tokens[i + 1].content
const slug = t.attrs.find(([name]) => name === 'id')[1]
res.push({
level: parseInt(t.tag.slice(1), 10),
title: deeplyParseHeaders(title),
slug: slug || md.slugify(title)
})
}
})
cache.set(key, res)
return res
}
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