Add share option to answers

app/assets/stylesheets/components/_answerbox.scss

@@ -62,3 +62,9 @@
     }
   }
 }
+
+body:not(.cap-web-share) {
+  .answerbox__action[name="ab-share"] {
+    display: none;
+  }
+}

app/javascript/retrospring/initializers/share.ts

@@ -0,0 +1,20 @@
+import $ from 'jquery';
+
+export default (): void => {
+    document.addEventListener('turbolinks:load', function () {
+        if (navigator.share) {
+            document.body.classList.add('cap-web-share')
+            $(document).on('click', 'button[name=ab-share]', function () {
+                const card = $(this).closest('.card')
+
+                navigator.share({
+                    url: card.find('.answerbox__answer-date a')[0].href
+                }).then(() => {
+                    // do nothing, prevents exception from being thrown
+                }).catch(() => {
+                    // do nothing, prevents exception from being thrown
+                })
+            })
+        }
+    })
+}

app/views/answerbox/_actions.haml

@@ -16,6 +16,8 @@
   %button.btn.btn-link.answerbox__action{ type: :button, name: 'ab-comments', data: { a_id: a.id, state: :hidden } }
     %i.fa.fa-fw.fa-comments
     %span{ id: "ab-comment-count-#{a.id}" }= a.comment_count
+%button.btn.btn-link.answerbox__action{ type: :button, name: 'ab-share'}
+  %i.fa.fa-fw.fa-share-alt{ title: 'Share' }
 - if user_signed_in?
   .btn-group
     %button.btn.btn-default.btn-sm.dropdown-toggle{ data: { toggle: :dropdown }, aria: { expanded: false } }