Add a very rough and dirty search mechanism that uses Git’s grep.

lib/gollum/frontend/app.rb

@@ -128,6 +128,13 @@ module Precious
       end
     end
 
+    get '/search' do
+      @q = params[:q]
+      @search_command = "cd #{$path} && git grep -c '#{@q}' master"
+      @results = `#{@search_command}`
+      mustache :search
+    end
+
     get '/*' do
       show_page_or_file(params[:splat].first)
     end

lib/gollum/frontend/templates/page.mustache

@@ -1,7 +1,9 @@
 <div class="guide">
   <div class="main">
     <div class="actions">
-      <a href="/">Home</a> | <a href="/edit/{{name}}">Edit</a>
+      <form action="/search" method="get">
+        <a href="/">Home</a> | <a href="/edit/{{name}}">Edit</a> | <input type="text" name="q" size="10" /> <input type="submit" value="search" />
+      </form>
     </div>
     <h1>{{title}}</h1>
     <div class="content wikistyle gollum {{format}}">

lib/gollum/frontend/templates/search.mustache

@@ -0,0 +1,20 @@
+<div class="guide">
+  <div class="main">
+    <div class="actions">
+      <form action="/search" method="get">
+        <a href="/">Home</a> | <input type="text" name="q" size="10" /> <input type="submit" value="search" />
+      </form>
+    </div>
+    <h1>Search for “{{search_string}}”</h1>
+    <div class="content wikistyle gollum">
+      <p>Searched with <code>{{search_command}}</code></p>
+      {{#has_results}}
+        <ul>
+        {{#results}}
+            <li><a href="/{{name}}">{{name}} ({{count}})</a></li>
+        {{/results}}
+        </ul>
+      {{/has_results}}
+    </div>
+  </div>
+</div>

lib/gollum/frontend/views/search.rb

@@ -0,0 +1,30 @@
+module Precious
+  module Views
+    class Search < Layout
+      attr_reader :content, :page, :footer, :search_command
+
+      def search_string
+        @q
+      end
+
+      def has_results
+        !results.empty?
+      end
+
+      def results
+        ret = []
+        @results.each_line do |line|
+          result = line.split(":")
+          file = result[1]
+          count = result[2].to_i
+          name = file.split(".")[0]
+          ret << {
+            :name => name,
+            :count => count
+          }
+        end
+        ret
+      end
+    end
+  end
+end