Time compression

app/decorators/asciicast_decorator.rb

@@ -5,11 +5,13 @@ class AsciicastDecorator < ApplicationDecorator
 
   THUMBNAIL_WIDTH = 20
   THUMBNAIL_HEIGHT = 10
+  MAX_DELAY = 5.0
 
   def as_json(*args)
     data = model.as_json(*args)
     data['escaped_stdout_data'] = escaped_stdout_data
-    data['stdout_timing_data'] = stdout_timing_data
+    data['stdout_timing_data'], saved_time = stdout_timing_data
+    data['duration'] = data['duration'] - saved_time
 
     data
   end
@@ -23,14 +25,25 @@ class AsciicastDecorator < ApplicationDecorator
   end
 
   def stdout_timing_data
+    saved_time = 0
+
     if data = stdout_timing.read
-      Bzip2.uncompress(data).lines.map do |line|
+      data = Bzip2.uncompress(data).lines.map do |line|
         delay, n = line.split
-        [delay.to_f, n.to_i]
+        delay = delay.to_f
+
+        if time_compression && delay > MAX_DELAY
+          saved_time += (delay - MAX_DELAY)
+          delay = MAX_DELAY
+        end
+
+        [delay, n.to_i]
       end
     else
-      nil
+      data = nil
     end
+
+    [data, saved_time]
   end
 
   def os

app/models/asciicast.rb

@@ -16,7 +16,7 @@ class Asciicast < ActiveRecord::Base
   before_create :assign_user, :unless => :user
 
   attr_accessible :meta, :stdout, :stdout_timing, :stdin, :stdin_timing,
-                  :title, :description
+                  :title, :description, :time_compression
 
   def self.assign_user(user_token, user)
     where(:user_id => nil, :user_token => user_token).

app/views/asciicasts/_form.html.erb

@@ -20,6 +20,22 @@
       </div>
     </div>
 
+    <div class="control-group">
+      <%= f.label :time_compression, :class => 'control-label' %>
+      <div class="controls">
+        <label class="radio" for="asciicast_time_compression_true">
+          <%= f.radio_button :time_compression, true %>
+          Enabled - terminal inactivity won't last longer
+          than <%= AsciicastDecorator::MAX_DELAY.to_i %> sec (recommended)
+        </label>
+
+        <label class="radio" for="asciicast_time_compression_false">
+          <%= f.radio_button :time_compression, false %>
+          Disabled - no change to timeline
+        </label>
+      </div>
+    </div>
+
     <div class="form-actions">
       <%= f.submit 'Update asciicast', :class => 'btn btn-primary' %>
       <%= link_to 'Cancel', asciicast_path, :class => 'btn' %>

db/migrate/20120504191706_add_time_compression_to_asciicast.rb

@@ -0,0 +1,5 @@
+class AddTimeCompressionToAsciicast < ActiveRecord::Migration
+  def change
+    add_column :asciicasts, :time_compression, :boolean, :null => false, :default => true
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended to check this file into your version control system.
 
-ActiveRecord::Schema.define(:version => 20120409142151) do
+ActiveRecord::Schema.define(:version => 20120504191706) do
 
   create_table "asciicasts", :force => true do |t|
     t.integer  "user_id"
@@ -36,7 +36,8 @@ ActiveRecord::Schema.define(:version => 20120409142151) do
     t.string   "username"
     t.text     "snapshot"
     t.integer  "comments_count",   :default => 0,     :null => false
-    t.integer  "likes_count",   :default => 0,     :null => false
+    t.integer  "likes_count",      :default => 0,     :null => false
+    t.boolean  "time_compression", :default => true,  :null => false
   end
 
   add_index "asciicasts", ["created_at"], :name => "index_asciicasts_on_created_at"