Add Utterances comment system (#625)

includes/specs/comment.spec.js

@@ -124,6 +124,33 @@ const ValineSpec = {
     }
 };
 
+const UtterancesSpec = {
+    repo: {
+        [type]: 'string',
+        [doc]: 'The repository willed connect to utterances',
+        [required]: true,
+        [requires]: comment => comment.type === 'utterances'
+    },
+    issue_term: {
+        [type]: 'string',
+        [doc]: 'Blog Post ↔️ Issue Mapping',
+        [defaultValue]: 'pathname',
+        [requires]: comment => comment.type === 'utterances'
+    },
+    label: {
+        [type]: 'string',
+        [doc]: 'Issue Label',
+        [defaultValue]: '',
+        [requires]: comment => comment.type === 'utterances'
+    },
+    theme: {
+        [type]: 'string',
+        [doc]: 'Utterances theme',
+        [defaultValue]: 'github-light',
+        [requires]: comment => comment.type === 'utterances'
+    }
+};
+
 module.exports = {
     [type]: 'object',
     [doc]: 'Comment plugin settings\nhttps://ppoffice.github.io/hexo-theme-icarus/categories/Plugins/Comment',
@@ -137,5 +164,6 @@ module.exports = {
     ...GitmentGitalkSpec,
     ...IssoSpec,
     ...LiveReSpec,
-    ...ValineSpec
+    ...ValineSpec,
+    ...UtterancesSpec
 }

layout/comment/utterances.ejs

@@ -0,0 +1,14 @@
+<% if (!has_config('comment.repo')) { %>
+<div class="notification is-danger">
+    You forgot to set the <code>repo</code> for utteranc.es Please set it in <code>_config.yml</code>.
+</div>
+<% } else { %>
+<script src="https://utteranc.es/client.js"
+        repo="<%= get_config('comment.repo') %>"
+        issue-term="<%= get_config('comment.issue-term') %>"
+        label="<%= get_config('comment.label') %>"
+        theme="<%= get_config('comment.theme') %>"
+        crossorigin="anonymous"
+        async>
+</script>
+<% } %>

layout/comment/utterances.locals.js

@@ -0,0 +1,3 @@
+module.exports = (ctx, locals) => {
+    return locals;
+}