allow searching stories by domain, link domain in story list to such a query

app/assets/stylesheets/application.css

@@ -516,6 +516,7 @@ li .domain {
 	color: #888;
 	font-style: italic;
 	font-size: 8.5pt;
+	text-decoration: none;
 	vertical-align: middle;
 }
 

app/controllers/search_controller.rb

@@ -7,9 +7,13 @@ class SearchController < ApplicationController
 
     if params[:q].to_s.present?
       @search.q = params[:q].to_s
-      @search.what = params[:what]
-      @search.order = params[:order]
 
+      if params[:what].present?
+        @search.what = params[:what]
+      end
+      if params[:order].present?
+        @search.order = params[:order]
+      end
       if params[:page].present?
         @search.page = params[:page].to_i
       end

app/indices/story_index.rb

@@ -11,6 +11,10 @@ ThinkingSphinx::Index.define :story, :with => :active_record do
   has hotness, is_expired
   has Story.score_sql, :as => :score, :type => :bigint, :sortable => true
 
+  # opts[:with] = { :id => ... } doesn't seem to work when sphinx searches on
+  # story_core, so give this column a different name to restrict on
+  has id, :as => :story_id
+
   set_property :field_weights => {
     :upvotes => 15,
     :title => 10,

app/models/search.rb

@@ -58,6 +58,30 @@ class Search
       opts[:order] = "score DESC"
     end
 
+    # extract domain query since it must be done separately
+    domain = nil
+    words = self.q.to_s.split(" ").reject{|w|
+      if m = w.match(/^domain:(.+)$/)
+        domain = m[1]
+      end
+    }.join(" ")
+
+    if domain.present?
+      self.what = "stories"
+      story_ids = Story.select(:id).where("`url` REGEXP '//([^/]*\.)?" +
+        ActiveRecord::Base.connection.quote_string(domain) + "/'").
+        collect(&:id)
+
+      if story_ids.any?
+        opts[:with] = { :story_id => story_ids }
+      else
+        self.results = []
+        self.total_results = 0
+        self.page = 0
+        return false
+      end
+    end
+
     opts[:classes] = case what
       when "all"
         [ Story, Comment ]
@@ -70,7 +94,7 @@ class Search
       end
 
     # escape sphinx special chars (using Riddle.escape removes boolean support)
-    query = self.q.gsub(/([\/~"])/, '\\\\\1')
+    query = words.gsub(/([\/~"])/, '\\\\\1')
 
     # go go gadget search
     self.results = []

app/models/story.rb

@@ -227,6 +227,10 @@ class Story < ActiveRecord::Base
     end
   end
 
+  def domain_search_url
+    "/search?q=domain:#{self.domain}&order=newest"
+  end
+
   def fetch_story_cache!
     if self.url.present?
       self.story_cache = StoryCacher.get_story_text(self.url)

app/views/stories/_listdetail.html.erb

@@ -29,7 +29,10 @@ class="story <%= story.vote == 1 ? "upvoted" : "" %> <%= story.vote == -1 ?
             title="<%= tagging.tag.description %>"><%= tagging.tag.tag %></a>
         <% end %>
       </span>
-      <span class="domain"><%= story.domain %></span>
+      <% if story.domain.present? %>
+        <a class="domain" href="<%= story.domain_search_url %>"><%=
+          story.domain %></a>
+      <% end %>
 
       <% if defined?(single_story) && single_story %>
         <% story.merged_stories.each do |ms| %>
@@ -45,7 +48,10 @@ class="story <%= story.vote == 1 ? "upvoted" : "" %> <%= story.vote == -1 ?
                 title="<%= tagging.tag.description %>"><%= tagging.tag.tag %></a>
             <% end %>
           </span>
-          <span class="domain"><%= ms.domain %></span>
+          <% if ms.domain.present? %>
+            <a class="domain" href="<%= ms.domain_search_url %>"><%=
+              ms.domain %></a>
+          <% end %>
           <span class="byline">
             by <a href="/u/<%= ms.user.username %>"
             <% if ms.user.is_new? %>