Improve boot speed and CPU usage

bin/rubyshell

@@ -1,6 +1,8 @@
-#!/usr/bin/env ruby
+#!/usr/bin/env -S ruby --disable-gems
 # frozen_string_literal: true
 
+$LOAD_PATH.unshift(File.expand_path("../lib", __dir__))
+
 require "rubyshell"
 
 if ARGV.first&.strip&.start_with? "exec"

lib/rubyshell.rb

@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 
-require "logger"
-
 require_relative "rubyshell/version"
 require_relative "rubyshell/command"
 require_relative "rubyshell/chainer"
@@ -43,6 +41,8 @@ def debug?
     attr_writer :logger
 
     def logger
+      require "logger"
+
       @logger ||= Logger.new($stdout)
     end
 

lib/rubyshell/chainer.rb

@@ -1,6 +1,5 @@
 # frozen_string_literal: true
 
-require "debug"
 module RubyShell
   class Chainer
     attr_reader :parts, :options

lib/rubyshell/terminal_executor.rb

@@ -34,7 +34,7 @@ def self.capture(command, options) # rubocop:disable Metris/MethodLength,Metrics
         until ios.empty?
           status ||= w_thread.join(0)
 
-          readable, = IO.select(ios.keys, nil, nil, 0)
+          readable, = IO.select(ios.keys, nil, nil, SELECT_TIMEOUT)
 
           break if !readable && status
           next unless readable