Adding a progress bar to save

lib/squib/api/save.rb

@@ -24,12 +24,20 @@ module Squib
     # @option opts [Enumerable] range (:all) the range of cards over which this will be rendered. See {file:API.md#label-Specifying+Ranges Specifying Ranges}
     # @option opts [String] dir (_output) the directory for the output to be sent to. Will be created if it doesn't exist.
     # @option opts [String] prefix (card_) the prefix of the file name to be printed.
+    # @option opts [Boolean] progress_bar (false) if true, show a progress bar on stdout while saving
     # @return [nil] Returns nothing
     # @api public
     def save_png(opts = {})
-      opts = needs(opts,[:range, :creatable_dir, :prefix])
+      opts = needs(opts,[:range, :creatable_dir, :prefix, :progress_bar])
+      if opts[:progress_bar] 
+        require 'ruby-progressbar'
+        bar = ProgressBar.create(title: "Saving to PNGs", 
+                                 starting_at: 0, total: opts[:range].size,
+                                 format: '%t <%B> %p%% %a')
+      end
       opts[:range].each do |i| 
         @cards[i].save_png(i, opts[:dir], opts[:prefix])
+        bar.increment if opts[:progress_bar]
       end
     end
 

lib/squib/constants.rb

@@ -34,7 +34,8 @@ module Squib
       :prefix => "card_",
       :margin => 75,
       :gap => 0,
-      :trim => 0
+      :trim => 0,
+      :progress_bar => false
     }
 
 end

samples/basic.rb

@@ -16,5 +16,5 @@ Squib::Deck.new(width: 825, height: 1125, cards: 3) do
    png range: [0,2], file: 'shiny-purse.png', x: 620, y: 75
    svg range: 1..2, file: 'spanner.svg', x: 620, y: 218
 
-  save prefix: 'basic_', format: :png
+  save prefix: 'basic_', format: :png#, progress_bar: true
 end

squib.gemspec

@@ -32,6 +32,7 @@ Gem::Specification.new do |spec|
   spec.add_runtime_dependency 'roo', '~> 1.13.2'
   spec.add_runtime_dependency 'rsvg2', '~> 2.2.0'
   spec.add_runtime_dependency 'mercenary', '~> 0.3.4'
+  spec.add_runtime_dependency 'ruby-progressbar', '~> 1.5.1'
 
   spec.add_development_dependency "bundler", "~> 1.6"
   spec.add_development_dependency "rake"