Send some messages to warm up the first user in a realm.

(imported from commit b4d92d474b27c9a0eabf99576a0f441a7d919106)

static/js/tutorial.js

@@ -184,6 +184,20 @@ var fake_messages = [
     }
 ];
 
+function send_delayed_stream_message(stream, topic, content, delay) {
+    setTimeout(function () {
+        $.ajax({
+            dataType: 'json',
+            url: '/json/tutorial_send_message',
+            type: 'POST',
+            data: {'type': 'stream',
+                   'recipient': stream,
+                   'topic': topic,
+                   'content': content}
+        });
+    }, delay * 1000); // delay is in seconds.
+}
+
 function hide_app_alert() {
     $('#alert-bar-container').slideUp(100);
 }
@@ -336,6 +350,17 @@ function finale() {
     if (stream_data.in_home_view(page_params.notifications_stream)) {
         narrow.activate([["stream", page_params.notifications_stream]]);
     }
+
+    if (page_params.first_in_realm) {
+        if (stream_data.in_home_view("engineering")) {
+            send_delayed_stream_message("engineering", "projects", "This is a message on stream **engineering** with the topic **projects**. Practice sending sending some messages here, or creating a new topic.", 10);
+            send_delayed_stream_message("engineering", "projects", "You might also enjoy:\n* Our lightweight formatting\n* emoji :thumbsup:\n* Our [desktop and mobile apps](/apps)", 15);
+        }
+
+        if (stream_data.in_home_view("social")) {
+            send_delayed_stream_message("social", "cute animals", "This is a message on stream **social** with the topic **cute animals**. Try uploading or pasting in some pictures. Here's a [guinea pig](https://humbug-user-uploads.s3.amazonaws.com/byqgM1qjol1mzje_KzeNRT5F/guinea.jpg) to get you started:", 25);
+        }
+    }
 }
 
 function reply() {

zerver/views/__init__.py

@@ -785,9 +785,10 @@ def home(request):
     needs_tutorial = settings.TUTORIAL_ENABLED and \
         user_profile.tutorial_status != UserProfile.TUTORIAL_FINISHED
 
+    first_in_realm = realm_user_count(user_profile.realm) == 1
     # If you are the only person in the realm and you didn't invite
     # anyone, we'll continue to encourage you to do so on the frontend.
-    prompt_for_invites = (realm_user_count(user_profile.realm) == 1) and \
+    prompt_for_invites = first_in_realm and \
         not PreregistrationUser.objects.filter(referred_by=user_profile).count()
 
     if user_profile.pointer == -1 and user_has_messages:
@@ -846,6 +847,7 @@ def home(request):
         referrals             = register_ret['referrals'],
         realm_emoji           = register_ret['realm_emoji'],
         needs_tutorial        = needs_tutorial,
+        first_in_realm        = first_in_realm,
         prompt_for_invites    = prompt_for_invites,
         desktop_notifications_enabled = desktop_notifications_enabled,
         notifications_stream  = notifications_stream,