docsify/src/core/fetch/index.js

import { get } from './ajax'
import { callHook } from '../init/lifecycle'
import { getParentPath } from '../route/util'
import { noop } from '../util/core'

function loadNested (path, file, next, vm, first) {
  path = first ? path : path.replace(/\/$/, '')
  path = getParentPath(path)

  if (!path) return

  get(vm.$getFile(path + file))
    .then(next, _ => loadNested(path, file, next, vm))
}

export function fetchMixin (proto) {
  let last
  proto._fetch = function (cb = noop) {
    const { path } = this.route
    const { loadNavbar, loadSidebar } = this.config

    // Abort last request
    last && last.abort && last.abort()

    last = get(this.$getFile(path), true)

    // Current page is html
    this.isHTML = /\.html$/g.test(path)

    // Load main content
    last.then((text, opt) => {
      this._renderMain(text, opt)
      if (!loadSidebar) return cb()

      const fn = result => { this._renderSidebar(result); cb() }

      // Load sidebar
      loadNested(path, loadSidebar, fn, this, true)
    },
    _ => this._renderMain(null))

    // Load nav
    loadNavbar &&
    loadNested(path, loadNavbar, text => this._renderNav(text), this, true)
  }

  proto._fetchCover = function () {
    const { coverpage } = this.config
    const root = getParentPath(this.route.path)
    const path = this.$getFile(root + coverpage)

    if (this.route.path !== '/' || !coverpage) {
      this._renderCover()
      return
    }

    this.coverIsHTML = /\.html$/g.test(path)
    get(path)
      .then(text => this._renderCover(text))
  }

  proto.$fetch = function (cb = noop) {
    this._fetchCover()
    this._fetch(result => {
      this.$resetEvents()
      callHook(this, 'doneEach')
      cb()
    })
  }
}

export function initFetch (vm) {
  vm.$fetch(_ => callHook(vm, 'ready'))
}