FEATURE: More granular mailing list mode (#4068)

* Rearrange frontend to account for mailing list mode

* Allow update of user preference for mailing list frequency

* Add mailing list frequency estimate

* Simplify frequency estimate; disable activity summary for mailing list mode

* Remove combined updates

* Add specs for enqueue mailing list mode job

* Write mailing list method for mailer

* Fix linting error

* Account for stale topics

* Add translations for default mailing list setting

* One query for mailing list topics

* Fix failing spec

* WIP

* Flesh out html template

* First pass at text-based mailing list summary

* Add user avatar

* Properly format posts for mailing list

* Move make_all_links_absolute into Email::Styles

* Apply first_seen_at to user

* Send mailing list email summary hourly based on first_seen_at

* Branch and test cleanup

* Use existing mailing list mode estimate

* Fix failing specs

config/locales/client.en.yml

@@ -504,7 +504,17 @@ en:
       suspended_notice: "This user is suspended until {{date}}."
       suspended_reason: "Reason: "
       github_profile: "Github"
-      mailing_list_mode: "Send me an email for every new post (unless I mute the topic or category)"
+      email_activity_summary: "Activity Summary"
+      mailing_list_mode:
+        label: "Mailing list mode"
+        enabled: "Enable mailing list mode."
+        instructions: |
+          This setting overrides the activity summary.<br />
+          Muted topics and categories are not included in these emails.
+        daily: "Send daily updates."
+        individual: "Send an email for every new post."
+        many_per_day: "Send me an email for every new post (about {{dailyEmailEstimate}} per day)."
+        few_per_day: "Send me an email for every new post (less than 2 per day)."
       watched_categories: "Watched"
       watched_categories_instructions: "You will automatically watch all new topics in these categories. You will be notified of all new posts and topics, and a count of new posts will also appear next to the topic."
       tracked_categories: "Tracked"

config/locales/server.en.yml

@@ -28,6 +28,7 @@ en:
       short_no_year: "%B %-d"
       # Format directives: http://ruby-doc.org/core-2.2.0/Time.html#method-i-strftime
       date_only: "%B %-d, %Y"
+      long: "%B %-d, %Y, %l:%M%P"
   date:
     # Do not remove the brackets and commas and do not translate the first month name. It should be "null".
     month_names:
@@ -35,6 +36,8 @@ en:
     <<: *datetime_formats
   time:
     <<: *datetime_formats
+    am: "am"
+    pm: "pm"
 
   title: "Discourse"
   topics: "Topics"
@@ -1300,6 +1303,7 @@ en:
     default_email_private_messages: "Send an email when someone messages the user by default."
     default_email_direct: "Send an email when someone quotes/replies to/mentions or invites the user by default."
     default_email_mailing_list_mode: "Send an email for every new post by default."
+    default_email_mailing_list_mode_frequency: "Users who enable mailing list mode will receive emails this often by default."
     disable_mailing_list_mode: "Disallow users from enabling mailing list mode."
     default_email_always: "Send an email notification even when the user is active by default."
     default_email_previous_replies: "Include previous replies in emails by default."
@@ -2278,6 +2282,15 @@ en:
       more_topics: "There were %{new_topics_since_seen} other new topics."
       more_topics_category: "More new topics:"
 
+    mailing_list:
+      why: "All activity on %{site_link} for %{date}"
+      subject_template: "[%{site_name}] Summary for %{date}"
+      unsubscribe: "This summary is sent daily due to mailing list mode being enabled. To unsubscribe %{unsubscribe_link}."
+      from: "%{site_name} summary"
+      new_topics: "New topics"
+      topic_updates: "Topic updates"
+      view_this_topic: "View this topic"
+      back_to_top: "Back to top"
     forgot_password:
       subject_template: "[%{site_name}] Password reset"
       text_body_template: |

config/site_settings.yml

@@ -1128,6 +1128,9 @@ user_preferences:
   default_email_private_messages: true
   default_email_direct: true
   default_email_mailing_list_mode: false
+  default_email_mailing_list_mode_frequency:
+    enum: 'MailingListModeSiteSetting'
+    default: 1
   disable_mailing_list_mode:
     default: false
     client: true