Add ?t=1:20 param support

app/assets/javascripts/player.js

@@ -12,6 +12,7 @@ function tryCreatePlayer(parentNode, asciicast, options) {
         speed: options.speed,
         autoPlay: options.autoPlay,
         loop: options.loop,
+        startAt: options.startAt,
         fontSize: options.fontSize,
         theme: options.theme,
         title: options.title,

app/models/playback_options.rb

@@ -1,22 +1,40 @@
 class PlaybackOptions
 
+  class Time < Virtus::Attribute
+    def coerce(value)
+      value = value.presence
+
+      if value
+        smh = value.strip.sub("m", ":0").split(":").reverse
+        smh[0].to_i + smh[1].to_i * 60 + smh[2].to_i * 3600
+      end
+    end
+  end
+
   include Virtus.model
 
   attribute :speed,     Float,   default: 1.0
   attribute :size,      String,  default: 'small'
-  attribute :autoplay,  Boolean, default: false
+  attribute :autoplay,  Boolean
   attribute :loop,      Boolean, default: false
   attribute :benchmark, Boolean, default: false
   attribute :theme,     String,  default: Theme::DEFAULT
+  attribute :t,         Time
 
   def as_json(*)
-    {
+    opts = {
       speed: speed,
       autoPlay: autoplay,
       loop: loop,
       fontSize: size,
-      theme: theme
+      theme: theme,
     }
+
+    if t
+      opts = opts.merge(startAt: t)
+    end
+
+    opts
   end
 
 end

spec/models/playback_options.rb

@@ -0,0 +1,13 @@
+require 'rails_helper'
+
+describe PlaybackOptions do
+  it 'coerces time' do
+    expect(PlaybackOptions.new.t).to eq(nil)
+    expect(PlaybackOptions.new(t: '').t).to eq(nil)
+    expect(PlaybackOptions.new(t: '5').t).to eq(5)
+    expect(PlaybackOptions.new(t: '5s').t).to eq(5)
+    expect(PlaybackOptions.new(t: '2m9s').t).to eq(129)
+    expect(PlaybackOptions.new(t: '2:09').t).to eq(129)
+    expect(PlaybackOptions.new(t: '1:02:09').t).to eq(3600+129)
+  end
+end