initial commit.

.gitignore

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+*.gem
+.bundle
+Gemfile.lock
+pkg/*

Gemfile

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+source "http://rubygems.org"
+
+# Specify your gem's dependencies in sprockets-image_compressor.gemspec
+gemspec

Rakefile

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+require "bundler/gem_tasks"

lib/sprockets-image_compressor.rb

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+require "sprockets/image_compressor"

lib/sprockets/image_compressor.rb

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+require "sprockets/image_compressor/version"
+require "sprockets/image_compressor/png_compressor"
+require "sprockets/image_compressor/railtie" if defined?(Rails)

lib/sprockets/image_compressor/png_compressor.rb

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+module Sprockets
+  module ImageCompressor
+    class PngCompressor
+      def compress(content)
+        compressed_png_data = ""
+        Tempfile.open ["in_file", ".png"] do |in_file|
+          out_file_path = in_file.path + ".optimized.png"
+          in_file.write content
+          in_file.close
+          out = `pngcrush #{in_file.path} #{out_file_path}`
+          in_file.delete
+
+          compressed_png_data = File.read out_file_path
+          File.unlink out_file_path
+        end
+        compressed_png_data
+      end
+    end
+  end
+end

lib/sprockets/image_compressor/railtie.rb

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+module Sprockets
+  module ImageCompressor
+    class Railtie < Rails::Engine
+      initializer :setup_png_compressor do |app|
+        if app.config.assets.compress
+          app.assets.register_mime_type 'image/png', '.png'
+          app.assets.register_postprocessor 'image/png', :png_compressor do |context, data|
+            PngCompressor.new.compress data
+          end
+        end
+      end
+    end
+  end
+end

lib/sprockets/image_compressor/version.rb

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+module Sprockets
+  module Imagecompressor
+    VERSION = "0.0.1"
+  end
+end

sprockets-image_compressor.gemspec

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+# -*- encoding: utf-8 -*-
+$:.push File.expand_path("../lib", __FILE__)
+require "sprockets/image_compressor/version"
+
+Gem::Specification.new do |s|
+  s.name        = "sprockets-image_compressor"
+  s.version     = Sprockets::Imagecompressor::VERSION
+  s.authors     = ["Micah Geisel"]
+  s.email       = ["micah@botandrose.com"]
+  s.homepage    = ""
+  s.summary     = %q{Losslessly compress images in the Rails asset pipeline}
+  s.description = %q{Losslessly compress images in the Rails asset pipeline}
+
+  s.rubyforge_project = "sprockets-image_compressor"
+
+  s.files         = `git ls-files`.split("\n")
+  s.test_files    = `git ls-files -- {test,spec,features}/*`.split("\n")
+  s.executables   = `git ls-files -- bin/*`.split("\n").map{ |f| File.basename(f) }
+  s.require_paths = ["lib"]
+
+  # specify any dependencies here; for example:
+  # s.add_development_dependency "rspec"
+  # s.add_runtime_dependency "rest-client"
+end