Replace deprecated method exists?

README.md

@@ -1,4 +1,4 @@
-Sprite Factory (v1.7.1)
+Sprite Factory (v1.7.3)
 =======================
 
 The sprite factory is a ruby library that can be used to generate

RELEASE_NOTES.md

@@ -1,3 +1,13 @@
+June 14th 2021 - v1.7.3
+---------------------------
+
+* removed deprecated method `has_rdoc` from gemspec. This method has no replacement and will be removed in Rubygems 4.
+
+February 26th 2021 - v1.7.2
+---------------------------
+
+* replaced deprecated method `opacity`, so that this gem can be used with rmagick >= 4.0.0.
+
 September 9th 2015 - v1.7.1
 ---------------------------
 

lib/sprite_factory.rb

@@ -2,7 +2,7 @@ module SpriteFactory
 
   #----------------------------------------------------------------------------
 
-  VERSION     = "1.7.1"
+  VERSION     = "1.7.3"
   SUMMARY     = "Automatic CSS sprite generator"
   DESCRIPTION = "Combines individual images from a directory into a single sprite image file and creates an appropriate CSS stylesheet"
   LIB         = File.dirname(__FILE__)

lib/sprite_factory/library/rmagick.rb

@@ -20,7 +20,7 @@ def self.load(files)
 
       def self.create(filename, images, width, height)
         target = Magick::Image.new(width,height)
-        target.opacity = Magick::QuantumRange
+        target.alpha(Magick::TransparentAlphaChannel)
         images.each do |image|
           target.composite!(image[:image], image[:x], image[:y], Magick::SrcOverCompositeOp)
         end

lib/sprite_factory/runner.rb

@@ -59,7 +59,7 @@ def run!(&block)
       css = []
       css << style_comment(header) unless nocomments?                       # header comment
       css << style(selector, css_url, images, &block)                       # generated styles
-      css << IO.read(custom_style_file) if File.exists?(custom_style_file)  # custom styles
+      css << IO.read(custom_style_file) if File.exist?(custom_style_file)  # custom styles
       css = css.join("\n")
 
       create_sprite(images, max[:width], max[:height])

sprite_factory.gemspec

@@ -16,7 +16,6 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'rmagick'
   s.add_development_dependency 'chunky_png'
 
-  s.has_rdoc         = false
   s.extra_rdoc_files = ["README.md"]
   s.rdoc_options     = ["--charset=UTF-8"]
   s.files            = `git ls-files `.split("\n")

test/integration_test.rb

@@ -179,13 +179,13 @@ def test_generate_sprite_with_nocss
       output = File.basename(REGULAR_PATH)
       with_clean_output do
 
-        assert_equal(false, File.exists?(output_path(output + ".png")), "preconditions")
-        assert_equal(false, File.exists?(output_path(output + ".css")), "preconditions")
+        assert_equal(false, File.exist?(output_path(output + ".png")), "preconditions")
+        assert_equal(false, File.exist?(output_path(output + ".css")), "preconditions")
 
         css = SpriteFactory.run!(REGULAR_PATH, {:nocss => true})
 
-        assert_equal(true,  File.exists?(output_path(output + ".png")), "output sprite IMAGE should exist")
-        assert_equal(false, File.exists?(output_path(output + ".css")), "output sprite CSS should NOT exist")
+        assert_equal(true,  File.exist?(output_path(output + ".png")), "output sprite IMAGE should exist")
+        assert_equal(false, File.exist?(output_path(output + ".css")), "output sprite CSS should NOT exist")
         assert_equal(IO.read(reference_path(output+".css")), css, "expected return value from #run! to provide generated CSS content")
 
         assert_reference_image(output + ".png")