presenters: merge PostSetPresenter into PostSet.

Reduce indirection. PostSet is basically a collection of helper methods
for rendering the post index page. PostSetPresenter was a set of helper
methods for rendering the tag list on the post index page. These don't
need to be separated.

app/logical/post_sets/post.rb

@@ -1,6 +1,8 @@
 module PostSets
   class Post
     MAX_PER_PAGE = 200
+    MAX_SIDEBAR_TAGS = 25
+
     attr_reader :page, :random, :post_count, :format, :tag_string, :query
 
     def initialize(tags, page = 1, per_page = nil, random: false, format: "html")
@@ -118,10 +120,6 @@ module PostSets
       [page.to_i, 1].max
     end
 
-    def presenter
-      @presenter ||= ::PostSetPresenters::Post.new(self)
-    end
-
     def best_post
       # be smarter about this in the future
       posts.reject(&:is_deleted).select(&:visible?).max_by(&:fav_count)
@@ -131,5 +129,75 @@ module PostSets
       return BulkUpdateRequest.none unless tag.present?
       @pending_bulk_update_requests ||= BulkUpdateRequest.pending.where_array_includes_any(:tags, tag.name)
     end
+
+    def post_previews_html(template, show_cropped: true, **options)
+      html = ""
+      if none_shown(options)
+        return template.render("post_sets/blank")
+      end
+
+      posts.each do |post|
+        html << PostPresenter.preview(post, options.merge(:tags => tag_string))
+        html << "\n"
+      end
+
+      html.html_safe
+    end
+
+    def not_shown(post, options)
+      !options[:show_deleted] && post.is_deleted? && tag_string !~ /status:(?:all|any|deleted|banned)/
+    end
+
+    def none_shown(options)
+      posts.reject {|post| not_shown(post, options) }.empty?
+    end
+
+    concerning :TagListMethods do
+      def related_tags
+        if query.is_wildcard_search?
+          wildcard_tags
+        elsif query.is_metatag?(:search)
+          saved_search_tags
+        elsif query.is_empty_search? || query.is_metatag?(:order, :rank)
+          popular_tags
+        elsif query.is_single_term?
+          similar_tags
+        else
+          frequent_tags
+        end
+      end
+
+      def popular_tags
+        if PopularSearchService.enabled?
+          PopularSearchService.new(Date.today).tags
+        else
+          frequent_tags
+        end
+      end
+
+      def similar_tags
+        RelatedTagCalculator.cached_similar_tags_for_search(query, MAX_SIDEBAR_TAGS)
+      end
+
+      def frequent_tags
+        RelatedTagCalculator.frequent_tags_for_post_array(posts).take(MAX_SIDEBAR_TAGS)
+      end
+
+      def wildcard_tags
+        Tag.wildcard_matches(tag_string)
+      end
+
+      def saved_search_tags
+        ["search:all"] + SavedSearch.labels_for(CurrentUser.user.id).map {|x| "search:#{x}"}
+      end
+
+      def tag_set_presenter
+        @tag_set_presenter ||= TagSetPresenter.new(related_tags.take(MAX_SIDEBAR_TAGS))
+      end
+
+      def tag_list_html(**options)
+        tag_set_presenter.tag_list_html(name_only: query.is_metatag?(:search), **options)
+      end
+    end
   end
 end

app/presenters/post_set_presenters/base.rb

@@ -1,29 +0,0 @@
-module PostSetPresenters
-  class Base
-    def posts
-      raise NotImplementedError
-    end
-
-    def post_previews_html(template, options = {})
-      html = ""
-      if none_shown(options)
-        return template.render("post_sets/blank")
-      end
-
-      posts.each do |post|
-        html << PostPresenter.preview(post, options.merge(:tags => @post_set.tag_string))
-        html << "\n"
-      end
-
-      html.html_safe
-    end
-
-    def not_shown(post, options)
-      !options[:show_deleted] && post.is_deleted? && @post_set.tag_string !~ /status:(?:all|any|deleted|banned)/
-    end
-
-    def none_shown(options)
-      posts.reject {|post| not_shown(post, options) }.empty?
-    end
-  end
-end

app/presenters/post_set_presenters/post.rb

@@ -1,62 +0,0 @@
-module PostSetPresenters
-  class Post < Base
-    MAX_TAGS = 25
-
-    attr_accessor :post_set
-    delegate :posts, :to => :post_set
-
-    def initialize(post_set)
-      @post_set = post_set
-    end
-
-    def tag_set_presenter
-      @tag_set_presenter ||= TagSetPresenter.new(related_tags.take(MAX_TAGS))
-    end
-
-    def post_previews_html(template, options = {})
-      super(template, options.merge(show_cropped: true))
-    end
-
-    def related_tags
-      if post_set.query.is_wildcard_search?
-        wildcard_tags
-      elsif post_set.query.is_metatag?(:search)
-        saved_search_tags
-      elsif post_set.query.is_empty_search? || post_set.query.is_metatag?(:order, :rank)
-        popular_tags
-      elsif post_set.query.is_single_term?
-        similar_tags
-      else
-        frequent_tags
-      end
-    end
-
-    def popular_tags
-      if PopularSearchService.enabled?
-        PopularSearchService.new(Date.today).tags
-      else
-        frequent_tags
-      end
-    end
-
-    def similar_tags
-      RelatedTagCalculator.cached_similar_tags_for_search(post_set.query, MAX_TAGS)
-    end
-
-    def frequent_tags
-      RelatedTagCalculator.frequent_tags_for_post_array(post_set.posts).take(MAX_TAGS)
-    end
-
-    def wildcard_tags
-      Tag.wildcard_matches(post_set.tag_string)
-    end
-
-    def saved_search_tags
-      ["search:all"] + SavedSearch.labels_for(CurrentUser.user.id).map {|x| "search:#{x}"}
-    end
-
-    def tag_list_html(**options)
-      tag_set_presenter.tag_list_html(name_only: post_set.query.is_metatag?(:search), **options)
-    end
-  end
-end

app/views/posts/index.html.erb

@@ -7,7 +7,7 @@
 
   <section id="tag-box">
     <h1>Tags</h1>
-    <%= @post_set.presenter.tag_list_html(current_query: params[:tags], show_extra_links: policy(Post).show_extra_links?) %>
+    <%= @post_set.tag_list_html(current_query: params[:tags], show_extra_links: policy(Post).show_extra_links?) %>
   </section>
 
   <%= render "posts/partials/index/options" %>

app/views/posts/partials/index/_posts.html.erb

@@ -1,6 +1,6 @@
 <div id="posts" class="user-disable-cropped-<%= Danbooru.config.enable_image_cropping && CurrentUser.user.disable_cropped_thumbnails? %>">
   <div id="posts-container">
-    <%= post_set.presenter.post_previews_html(self) %>
+    <%= post_set.post_previews_html(self) %>
   </div>
 
   <% if post_set.hidden_posts.present? %>