Switch templates from HAML to ERB

Make RailsAdmin have fewer dependencies and so slightly reduce total
installation size.

Align the project with default upstream Rails practices. Starting a new
Rails project includes ERB by default but not HAML. By switching, we
don't pull in additional templating practices beyond what any default
project is already using.

The change may also help encourage contributors. While nearly all Rails
developers have direct experience working with ERB, the same is not
always true of HAML. This removes a small barrier.

Fixes #3173

Author: jdufresne

.rubocop_todo.yml

@@ -302,7 +302,6 @@ Style/IdenticalConditionalBranches:
 # Cop supports --auto-correct.
 Style/IfUnlessModifier:
   Exclude:
-    - "config/initializers/haml.rb"
     - "lib/rails_admin/adapters/active_record.rb"
     - "lib/rails_admin/adapters/mongoid.rb"
     - "lib/rails_admin/bootstrap-sass.rb"

Appraisals

@@ -1,6 +1,5 @@
 appraise "rails-6.0" do
   gem 'rails', '~> 6.0.0'
-  gem 'haml'
   gem 'sassc-rails', '~> 2.1'
   gem 'devise', '~> 4.7'
 
@@ -34,7 +33,6 @@ end
 
 appraise "rails-6.1" do
   gem 'rails', '~> 6.1.0'
-  gem 'haml'
   gem 'sassc-rails', '~> 2.1'
   gem 'devise', '~> 4.7'
 
@@ -68,7 +66,6 @@ end
 
 appraise "rails-7.0" do
   gem 'rails', '~> 7.0.0.alpha2'
-  gem 'haml'
   gem 'sassc-rails', '~> 2.1'
   gem 'devise', '~> 4.7', github: 'strobilomyces/devise', branch: 'patch-1'
 

Gemfile

@@ -2,7 +2,6 @@ source 'https://rubygems.org'
 
 gem 'appraisal', '>= 2.0'
 gem 'rails'
-gem 'haml'
 gem 'devise'
 gem 'webrick', '~> 1.7'
 

app/views/kaminari/ra-twitter-bootstrap/_gap.html.erb

@@ -0,0 +1,5 @@
+<li class="disabled">
+  <a href="#">
+    <%= raw(t 'admin.pagination.truncate') %>
+  </a>
+</li>

app/views/kaminari/ra-twitter-bootstrap/_gap.html.haml

@@ -0,0 +1,9 @@
+<% if current_page.last? %>
+  <li class="next disabled">
+    <%= link_to raw(t 'admin.pagination.next'), '#' %>
+  </li>
+<% else %>
+  <li class="next">
+    <%= link_to raw(t 'admin.pagination.next'), url, class: (remote ? 'pjax' : '') %>
+  </li>
+<% end %>

app/views/kaminari/ra-twitter-bootstrap/_next_page.html.erb

@@ -0,0 +1,9 @@
+<% if page.current? %>
+  <li class="active">
+    <%= link_to page, url, class: (remote ? 'pjax' : '') %>
+  </li>
+<% else %>
+  <li>
+    <%= link_to page, url, class: (remote ? 'pjax' : '') %>
+  </li>
+<% end %>

app/views/kaminari/ra-twitter-bootstrap/_next_page.html.haml

@@ -0,0 +1,13 @@
+<%= paginator.render do %>
+  <ul class="pagination">
+    <%= prev_page_tag %>
+    <% each_page do |page| %>
+      <% if page.left_outer? or page.right_outer? or page.inside_window? %>
+        <%= page_tag page %>
+      <% elsif !page.was_truncated? %>
+        <%= gap_tag %>
+      <% end %>
+    <% end %>
+    <%= next_page_tag %>
+  </ul>
+<% end %>