lib/prez/helpers.rb in prez-0.0.2 vs lib/prez/helpers.rb in prez-0.0.3

@@ -4,23 +4,89 @@
 
 module Prez
   module Helpers
     protected
 
+    def duration(value)
+      if @duration
+        raise Prez::Error.new("The duration helper can only be called once!")
+      end
+
+      if value.kind_of?(String) && value.split(":").size > 3
+        raise Prez::Eror.new("Only hours:minutes:seconds are supported for the duration!")
+      end
+
+      @duration = value
+      nil
+    end
+
+    def duration_amount
+      return if @duration.nil? || @duration.to_i <= 0
+
+      # Ensure it is an integer first... then we can normalize based
+      # on standard times (ie, no 70 seconds, or 100 minutes)
+      if @duration.kind_of? String
+        @duration = @duration.split ":"
+        @duration.map! &:to_i
+        value = @duration.pop || 0
+        value += (@duration.pop || 0) * 60
+        value += (@duration.pop || 0) * 60 * 60
+        @duration = value
+      end
+
+      # Ensure we don't have a floating point number
+      @duration = @duration.to_i
+      seconds = @duration % 60
+      minutes = (@duration / 60) % 60
+      hours = @duration / 60 / 60
+
+      if hours > 0
+        "%d:%02d:%02d" % [hours, minutes, seconds]
+      elsif minutes > 0
+        "%2d:%02d" % [minutes, seconds]
+      else
+        seconds.to_s
+      end
+    end
+
     def html_escape(value)
       CGI.escape_html value
     end
 
-    def slide
-      concat %{<div class="prez-slide">}
+    def slide(options = {})
+      classes = ["prez-slide"]
+      align = options.fetch :align, :center
+
+      case align
+      when :left
+        classes << "left-aligned"
+      when :right
+        classes << "right-aligned"
+      when :center
+        # Nothing needed
+      else
+        raise Prez::Error.new("Invalid slide align: #{align.inspect}")
+      end
+
+      if options[:duration]
+        duration_attribute = %{ data-duration="#{options[:duration]}"}
+      end
+
+      concat %{<div class="#{classes.join " "}"#{duration_attribute}>}
       yield
       concat %{</div>}
     end
 
     def notes
       concat %{<div class="prez-notes">}
       yield
       concat %{</div>}
+    end
+
+    def image(name, options = {})
+      Prez::Assets.image name, options
+    rescue Prez::Files::MissingError
+      raise Prez::Error.new("Could not find image file: '#{name}'")
     end
 
     def javascript(name)
       Prez::Assets.javascript name
     rescue Prez::Files::MissingError