Add a way to provide a header image for the header

Author: richardboehme

app/assets/stylesheets/application.sass

@@ -121,6 +121,9 @@ header
     margin-left: 0
     width: 100px
 
+  #header_image
+    max-height: 250px
+
   #title, &:hover, &:active, &:visited
     color: $title-color
     text-decoration: none

app/helpers/home_helper.rb

@@ -16,4 +16,12 @@ def contact_text
       concat '.'
     end
   end
+
+  def header_image_path
+    File.join('labels', Whitelabel[:label_id], 'header.png')
+  end
+
+  def header_image_available?
+    Rails.root.join('app', 'assets', 'images', header_image_path).exist?
+  end
 end

app/views/application/_headline.slim

@@ -1,10 +1,15 @@
 header.d-none.d-xl-block
   .row
-    .col-lg-2.text-center
-      = link_to(root_path, title: title) do
-        =image_tag("labels/#{Whitelabel[:label_id]}.png", title: title, id: :logo)
+    - if false && header_image_available?
+      .col-lg-12
+        = link_to(root_path, title: title) do
+          = image_tag(header_image_path, title: title, id: :header_image)
+    - else
+      .col-lg-2.text-center
+        = link_to(root_path, title: title) do
+          =image_tag("labels/#{Whitelabel[:label_id]}.png", title: title, id: :logo)
 
-    .col-lg-10
-      = link_to(root_path, id: :title, title: title) do
-        h1= title
-        h2.mt-4= subtitle
+      .col-lg-10
+        = link_to(root_path, id: :title, title: title) do
+          h1= title
+          h2.mt-4= subtitle