refining and getting tests for placeholder

lib/squib/args/arg_loader.rb

@@ -126,4 +126,13 @@ module Squib::Args::ArgLoader
     self
   end
 
+  # Return the deck's configuration
+  # This keeps the @deck local to this mixin instead of forcing args classes
+  # to "know" that @deck works.
+  #
+  # It also makes unit testing easier. Sue me.
+  def deck_conf
+    @deck.conf
+  end
+
 end

lib/squib/args/input_file.rb

@@ -30,9 +30,9 @@ module Squib::Args
     def validate_file(arg, i)
       return nil if arg.nil?
       return File.expand_path(arg) if File.exists?(arg)
-      return File.expand_path(placeholder[i]) if File.exists?(placeholder[i])
+      return File.expand_path(placeholder[i]) if File.exists?(placeholder[i].to_s)
 
-      case @deck.conf.img_missing.to_sym
+      case deck_conf.img_missing.to_sym
       when :error
         raise "File #{File.expand_path(arg)} does not exist!"
       when :warn

samples/images/_placeholders.rb

@@ -16,13 +16,28 @@ Squib::Deck.new(width: 100, height: 100, cards: 3) do
 end
 
 # Placeholders can be per-image too.
-# What if a placeholder is specified but doesn't exist?
-# It'll always warn.
-Squib::Deck.new(width: 100, height: 100, cards: 3) do
+# What if a placeholder is specified but doesn't exist? It'll always warn.
+Squib.configure img_missing: :warn # default
+Squib::Deck.new(width: 100, height: 100, cards: 4) do
   background color: :white
 
-  files =        %w(angler-fish.png does-not-exist.png does-not-exist.png)
-  placeholders = %w(grit.png        does-not-exist.png grit.png)
+  files =        %w(angler-fish.png does-not-exist.png does-not-exist.png does-not-exist.png)
+  placeholders = %w(grit.png        does-not-exist.png grit.png                             )
   png file: files, placeholder: placeholders
   save_sheet columns: 1, prefix: 'multi_placeholder_sheet_'
+end
+
+# Do errors work?
+# If you REALLY want the old, pre-Squib v0.18 functionality
+# ...you can still have it
+# This is really more of a regression test than example.
+Squib.configure img_missing: :error
+Squib::Deck.new(width: 100, height: 100, cards: 1) do
+  begin
+    png file: 'does-not-exist.png' # no placeholder... should error!
+    raise Exception.new 'Runtime Error should have been thrown!'
+  rescue RuntimeError => e
+    # a runtime error should have happened here. So nothing happens. Good.
+    Squib.logger.error 'Yay! An error we expected was thrown.'
+  end
 end

spec/args/input_file_spec.rb

@@ -9,12 +9,24 @@ describe Squib::Args::InputFile do
     it 'allows a file if it exists' do
       args = { file: __FILE__ } # I code therefore I am.
       ifile.load!(args, expand_by: 1)
-      expect(ifile).to have_attributes(file: [File.expand_path(__FILE__)])
+      expect(ifile.file).to eq([File.expand_path(__FILE__)])
     end
 
-    it 'raises on non-existent file' do
+    it 'warns on non-existent file by default' do
       args = { file: 'foo.rb' }
-      expect { ifile.load!(args, expand_by: 1) }.to raise_error("File #{File.expand_path('foo.rb')} does not exist!")
+
+      conf = double("conf", conf: Squib::Conf.new)
+      expect(conf).to receive(:img_missing).and_return(:warn)
+      expect(ifile).to receive(:deck_conf).and_return(conf)
+      expect(Squib.logger).to receive(:warn).once
+
+      expect(ifile.load!(args, expand_by: 1)).to have_attributes(file: [nil])
+    end
+
+    it 'uses placeholder when file does not exist but placeholder is non-nil and does exist' do
+      args = { file: 'foo.rb', placeholder: __FILE__ }
+      expect(Squib.logger).not_to receive(:warn)
+      expect(ifile.load!(args, expand_by: 1).file).to eq([File.expand_path(__FILE__)])
     end
 
   end