diff --git a/bin/ocran b/bin/ocran
index 70b4b33..fcafe28 100644
--- a/bin/ocran
+++ b/bin/ocran
@@ -1,112 +1,11 @@
 #!/usr/bin/env ruby
 # encoding: UTF-8
-require "pathname"
 
 module Ocran
-  def self.option = @option
-
-  load File.expand_path("../lib/ocran/command_output.rb", __dir__)
-  extend CommandOutput
-
-  def Ocran.fatal_error(s)
-    error s
-    exit 1
-  end
-
-  def self.script = @option&.script
-
-  def self.run_script? = @option&.run_script?
-
-  def Ocran.init
-    load File.expand_path("../lib/ocran/runtime_environment.rb", __dir__)
-    @pre_env = RuntimeEnvironment.save
-
-    load File.expand_path("../lib/ocran/option.rb", __dir__)
-    @option = Option.new.tap do |opt|
-      opt.parse(ARGV)
-    rescue RuntimeError => e
-      # Capture RuntimeError during parsing and display an appropriate
-      # error message to the user. This error usually occurs from invalid
-      # option arguments.
-      Ocran.fatal_error e.message
-    else
-      # Update ARGV with the parsed command line arguments to pass to
-      # the user's script. This ensures the script executes based on
-      # the user-specified arguments.
-      ARGV.replace(opt.argv)
-    end
-
-    @ignore_modules = ObjectSpace.each_object(Module).to_a
-  end
-
-  # Force loading autoloaded constants. Searches through all modules
-  # (and hence classes), and checks their constants for autoloaded
-  # ones, then attempts to load them.
-  def self.attempt_load_autoload(ignore_modules = [])
-    checked_modules = ignore_modules.inject({}) { |h, mod| h[mod] = true; h }
-    while ObjectSpace.each_object(Module).count { |mod|
-      next if checked_modules.include?(mod)
-      mod.constants.each do |const|
-        next unless mod.autoload?(const)
-        say "Attempting to trigger autoload of #{mod}::#{const}"
-        begin
-          mod.const_get(const)
-        rescue ScriptError, StandardError => e
-          # Some autoload constants may throw exceptions beyond the expected
-          # errors. This includes issues dependent on the system or execution
-          # environment, so it is preferable to ignore exceptions other than
-          # critical errors.
-          warning "#{mod}::#{const} loading failed: #{e.message}"
-        end
-      end
-      checked_modules[mod] = true
-    }.nonzero?
-      # Loops until all constants have been checked.
-    end
-  end
-
-  def self.build
-    # If the script was run and autoload is enabled, attempt to autoload libraries.
-    if @option.force_autoload?
-      attempt_load_autoload(@ignore_modules)
-    end
-
-    @post_env = RuntimeEnvironment.save
-    # NOTE: From this point, $LOADED_FEATURES has been captured, so it is now
-    # safe to call require_relative.
-
-    ENV.replace(@pre_env.env)
-
-    # It might be useful to reset the current directory to the point where the
-    # command was launched, especially when implementing the builder object.
-    Dir.chdir(@pre_env.pwd)
-
-    require_relative "../lib/ocran/direction"
-    direction = Direction.new(@post_env, @pre_env, @option)
-
-    if @option.use_inno_setup?
-      direction.build_inno_setup_installer
-    else
-      direction.build_stab_exe
-    end
-  rescue RuntimeError => e
-    Ocran.fatal_error e.message
-  end
+  singleton_class.attr_accessor :option
 end # module Ocran
 
+load File.expand_path("../lib/ocran/runner.rb", __dir__)
 if File.basename(__FILE__) == File.basename($PROGRAM_NAME)
-  Ocran.init
-
-  at_exit do
-    if $!.nil? or $!.kind_of?(SystemExit)
-      Ocran.build
-      exit 0
-    end
-  end
-
-  if Ocran.run_script?
-    Ocran.say "Loading script to check dependencies"
-    $PROGRAM_NAME = Ocran.script.to_s
-    load Ocran.script
-  end
+  load Ocran::Runner.new.run
 end
diff --git a/lib/ocran/runner.rb b/lib/ocran/runner.rb
new file mode 100644
index 0000000..9d21741
--- /dev/null
+++ b/lib/ocran/runner.rb
@@ -0,0 +1,104 @@
+# frozen_string_literal: true
+
+module Ocran
+  class Runner
+    load File.expand_path("command_output.rb", __dir__)
+    include CommandOutput
+
+    def fatal_error(statement)
+      error statement
+      exit false
+    end
+
+    def initialize
+      load File.expand_path("runtime_environment.rb", __dir__)
+      @pre_env = RuntimeEnvironment.save
+
+      load File.expand_path("option.rb", __dir__)
+      @option = Option.new.tap do |opt|
+        opt.parse(ARGV)
+      rescue RuntimeError => e
+        # Capture RuntimeError during parsing and display an appropriate
+        # error message to the user. This error usually occurs from invalid
+        # option arguments.
+        fatal_error e.message
+      else
+        # Update ARGV with the parsed command line arguments to pass to
+        # the user's script. This ensures the script executes based on
+        # the user-specified arguments.
+        ARGV.replace(opt.argv)
+      end
+
+      Ocran.option = @option
+
+      @ignore_modules = ObjectSpace.each_object(Module).to_a
+    end
+
+    def run
+      at_exit do
+        if $!.nil? or $!.kind_of?(SystemExit)
+          build
+          exit
+        end
+      end
+
+      exit unless @option.run_script?
+      say "Loading script to check dependencies"
+      $PROGRAM_NAME = @option.script.to_s
+    end
+
+    # Force loading autoloaded constants. Searches through all modules
+    # (and hence classes), and checks their constants for autoloaded
+    # ones, then attempts to load them.
+    def attempt_load_autoload(ignore_modules = [])
+      checked_modules = ignore_modules.inject({}) { |h, mod| h[mod] = true; h }
+      while ObjectSpace.each_object(Module).count { |mod|
+        next if checked_modules.include?(mod)
+        mod.constants.each do |const|
+          next unless mod.autoload?(const)
+          say "Attempting to trigger autoload of #{mod}::#{const}"
+          begin
+            mod.const_get(const)
+          rescue ScriptError, StandardError => e
+            # Some autoload constants may throw exceptions beyond the expected
+            # errors. This includes issues dependent on the system or execution
+            # environment, so it is preferable to ignore exceptions other than
+            # critical errors.
+            warning "#{mod}::#{const} loading failed: #{e.message}"
+          end
+        end
+        checked_modules[mod] = true
+      }.nonzero?
+        # Loops until all constants have been checked.
+      end
+    end
+
+    def build
+      # If the script was run and autoload is enabled, attempt to autoload libraries.
+      if @option.force_autoload?
+        attempt_load_autoload(@ignore_modules)
+      end
+
+      @post_env = RuntimeEnvironment.save
+      # NOTE: From this point, $LOADED_FEATURES has been captured, so it is now
+      # safe to call require_relative.
+
+      ENV.replace(@pre_env.env)
+
+      # It might be useful to reset the current directory to the point where the
+      # command was launched, especially when implementing the builder object.
+      Dir.chdir(@pre_env.pwd)
+
+      require_relative "direction"
+      direction = Direction.new(@post_env, @pre_env, @option)
+
+      if @option.use_inno_setup?
+        direction.build_inno_setup_installer
+      else
+        direction.build_stab_exe
+      end
+    rescue RuntimeError => e
+      fatal_error e.message
+    end
+  end
+end