Add next_js helper (theme-next#1096)

* Add next-js

* Fix QA

Author: jiangtj

layout/_scripts/commons.swig

@@ -1,4 +1,4 @@
-<script src="{{ url_for(theme.js) }}/utils.js?v={{ version }}"></script>
+{{- next_js('utils.js') }}
 {%- if theme.motion.enable %}
-  <script src="{{ url_for(theme.js) }}/motion.js?v={{ version }}"></script>
+  {{- next_js('motion.js') }}
 {%- endif %}

layout/_scripts/next-boot.swig

@@ -1 +1 @@
-<script src="{{ url_for(theme.js) }}/next-boot.js?v={{ version }}"></script>
+{{- next_js('next-boot.js') }}

layout/_scripts/pages/post-details.swig

@@ -1,2 +1 @@
-<script src="{{ url_for(theme.js) }}/scrollspy.js?v={{ version }}"></script>
-<script src="{{ url_for(theme.js) }}/post-details.js?v={{ version }}"></script>
+{{- next_js('scrollspy.js', 'post-details.js') }}

layout/_scripts/schemes/muse.swig

@@ -1,9 +1 @@
-{%
-  set scripts = [
-    'schemes/muse.js'
-  ]
-%}
-
-{%- for script in scripts %}
-  <script src="{{ url_for(theme.js) }}/{{ script }}?v={{ version }}"></script>
-{%- endfor %}
+{{- next_js('schemes/muse.js') }}

layout/_scripts/schemes/pisces.swig

@@ -1 +1 @@
-<script src="{{ url_for(theme.js) }}/schemes/pisces.js?v={{ version }}"></script>
+{{- next_js('schemes/pisces.js') }}

layout/_third-party/search/algolia-search.swig

@@ -3,4 +3,4 @@
 <link rel="stylesheet" href="{{ algolia_instant_css_uri }}">
 <script src="{{ algolia_instant_js_uri }}"></script>
 
-<script src="{{ url_for(theme.js) }}/algolia-search.js?v={{ version }}"></script>
+{{- next_js('algolia-search.js') }}

layout/_third-party/search/localsearch.swig

@@ -1 +1 @@
-<script src="{{ url_for(theme.js) }}/local-search.js?v={{ version }}"></script>
+{{- next_js('local-search.js') }}

scripts/helpers/next-js.js

@@ -0,0 +1,9 @@
+/* global hexo */
+
+'use strict';
+
+hexo.extend.helper.register('next_js', function(...urls) {
+  let js = hexo.theme.config.js;
+  let version = this.next_env('version');
+  return urls.map(url => this.js(`${js}/${url}?v=${version}`)).join('');
+});