Rakefile fixups for easy Gem install + testing

Rakefile

@@ -4,22 +4,12 @@ rescue LoadError
   puts 'Cannot load bundler/gem_tasks'
 end
 
-task default: :test
-
-task prepare: "ext/lib/libsass.so"
+require 'tasks/libsass'
 
-file "ext/lib/libsass.so" do
-  gem_dir = File.expand_path(File.dirname(__FILE__)) + "/"
-  cd "ext/libsass"
-  sh 'make lib/libsass.so LDFLAGS="-Wall -O2"'
-  cd gem_dir
-end
+task default: :test
 
-task test: :prepare do
+desc "Run all tests"
+task test: 'libsass:compile' do
   $LOAD_PATH.unshift('lib', 'test')
   Dir.glob('./test/**/*_test.rb') { |f| require f }
 end
-
-task :submodule do
-  sh "git submodule update --init"
-end

ext/Rakefile

@@ -0,0 +1,3 @@
+require_relative '../lib/tasks/libsass'
+
+task default: 'libsass:compile'

lib/tasks/libsass.rb

@@ -0,0 +1,21 @@
+namespace :libsass do
+  desc "Compile libsass"
+  task compile: "ext/libsass/lib/libsass.so"
+
+  file "ext/libsass/.git" do
+    sh "git submodule update --init"
+  end
+
+  file "ext/libsass/lib/libsass.so" => "ext/libsass/.git" do
+    libsass_path = ""
+    if Dir.pwd.end_with?('/ext')
+      libsass_path = "libsass"
+    else
+      libsass_path = "ext/libsass"
+    end
+
+    cd libsass_path do
+      sh 'make lib/libsass.so LDFLAGS="-Wall -O2"'
+    end
+  end
+end

sassc.gemspec

@@ -16,9 +16,10 @@ Gem::Specification.new do |spec|
   spec.files         = `git ls-files -z`.split("\x0")
   spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
-  spec.require_paths = ["lib", "ext"]
 
-  spec.extensions    = ["Rakefile"]
+  spec.require_paths = ["lib"]
+
+  spec.extensions    = ["ext/Rakefile"]
 
   spec.add_development_dependency "rake"
   spec.add_development_dependency "minitest", "~> 5.5.1"