feat(plugin): add hotjar plugin

.github/ISSUE_TEMPLATE.md

@@ -1,4 +1,4 @@
 Please make sure you took care of the following things before you submit this issue. Thank you!
 
-- [ ] I have set up and configured my blog according to [Hexo documentation](https://hexo.io/) and [Icarus Documentation](https://github.com/ppoffice/hexo-theme-icarus/wiki);
+- [ ] I have set up and configured my blog according to the [Hexo docs](https://hexo.io/) and the [Icarus docs](https://ppoffice.github.io/hexo-theme-icarus/);
-- [ ] I have looked up the [Github Issues](https://github.com/ppoffice/hexo-theme-icarus/issues) and found no solutions to my problems.
+- [ ] I have looked up [Github issues](https://github.com/ppoffice/hexo-theme-icarus/issues) and found no solutions to my problems.

README.md

@@ -125,7 +125,10 @@ Please refer to the documentation for Icarus implementation details.
 
 ### :tada: Contribute
 
+If you feel like to help us build a better Icarus, you can
+
 :electric_plug: Write a plugin |
+:black_nib: <a href="https://github.com/ppoffice/hexo-theme-icarus/new/site/source/_posts">Submit a tutorial</a> |
 :triangular_flag_on_post: <a href="https://github.com/ppoffice/hexo-theme-icarus/issues/new">Report a bug</a> |
 :earth_asia: <a href="https://github.com/ppoffice/hexo-theme-icarus/tree/master/languages">Add a translation</a>
 

includes/common/utils.js

@@ -15,6 +15,9 @@ const descriptors = {
 };
 
 const is = (() => ({
+    number(value) {
+        return typeof (value) === 'number';
+    },
     string(value) {
         return typeof (value) === 'string';
     },

includes/specs/plugins.spec.js

@@ -1,4 +1,4 @@
-const { doc, type, defaultValue, required, requires } = require('../common/utils').descriptors;
+const { doc, type, defaultValue } = require('../common/utils').descriptors;
 
 module.exports = {
     [type]: 'object',
@@ -45,5 +45,14 @@ module.exports = {
             [doc]: 'Baidu Analytics tracking id',
             [defaultValue]: null
         }
+    },
+    hotjar: {
+        [type]: ['boolean', 'object'],
+        [doc]: 'Hotjar user feedback plugin (http://ppoffice.github.io/hexo-theme-icarus/2018/01/01/plugin/Analytics/#Hotjar)',
+        site_id: {
+            [type]: ['string', 'number'],
+            [doc]: 'Hotjar site id',
+            [defaultValue]: null
+        }
     }
 };

layout/plugin/hotjar.ejs

@@ -0,0 +1,12 @@
+<% if (head && get_config_from_obj(plugin, 'site_id')) { %>
+<script>
+    (function(h,o,t,j,a,r){
+        h.hj=h.hj||function(){(h.hj.q=h.hj.q||[]).push(arguments)};
+        h._hjSettings={hjid:<%= get_config_from_obj(plugin, 'site_id') %>,hjsv:6};
+        a=o.getElementsByTagName('head')[0];
+        r=o.createElement('script');r.async=1;
+        r.src=t+h._hjSettings.hjid+j+h._hjSettings.hjsv;
+        a.appendChild(r);
+    })(window,document,'https://static.hotjar.com/c/hotjar-','.js?sv=');
+</script>
+<% } %>