src/core/fetch/index.js

import { get } from './ajax'
import { callHook } from '../init/lifecycle'
import { getParentPath, stringifyQuery } from '../router/util'
import { noop } from '../util/core'
import { getAndActive } from '../event/sidebar'

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

  if (!path) return

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

export function fetchMixin (proto) {
  let last
  proto._fetch = function (cb = noop) {
    const { path, query } = this.route
    const qs = stringifyQuery(query, ['id'])
    const { loadNavbar, loadSidebar } = this.config

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

    last = get(this.router.getFile(path) + qs, true)

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

    const loadSideAndNav = () => {
      if (!loadSidebar) return cb()

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

      // Load sidebar
      loadNested(path, qs, loadSidebar, fn, this, true)
    }

    // Load main content
    last.then(
      (text, opt) => {
        this._renderMain(text, opt)
        loadSideAndNav()
      },
      _ => {
        this._renderMain(null)
        loadSideAndNav()
      }
    )

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

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

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

    this.coverIsHTML = /\.html$/g.test(path)
    get(path + stringifyQuery(query, ['id'])).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) {
  const { loadSidebar } = vm.config

  // server-client renderer
  if (vm.rendered) {
    const activeEl = getAndActive(vm.router, '.sidebar-nav', true, true)
    if (loadSidebar && activeEl) {
      activeEl.parentNode.innerHTML += window.__SUB_SIDEBAR__
    }
    vm._bindEventOnRendered(activeEl)
    vm._fetchCover()
    vm.$resetEvents()
    callHook(vm, 'doneEach')
    callHook(vm, 'ready')
  } else {
    vm.$fetch(_ => callHook(vm, 'ready'))
  }
}