module Jekyll::Utils::Platforms

def bash_on_windows?
  linux_os? && microsoft_proc_version?
end

def jruby?
  RUBY_ENGINE == "jruby"
end

def linux?
  linux_os? && !microsoft_proc_version?
end

def linux_os?
  rbconfig_host.include?("linux")
end

def microsoft_proc_version?
  proc_version.include?("microsoft")
end

def mri?
  RUBY_ENGINE == "ruby"
end

def osx?
  rbconfig_host.match?(%r!darwin|mac os!)
end

def proc_version
  @proc_version ||= \
    begin
      File.read("/proc/version").downcase
    rescue Errno::ENOENT, Errno::EACCES
      ""
    end
end

def rbconfig_host
  @rbconfig_host ||= RbConfig::CONFIG["host_os"].downcase
end

def unix?
  rbconfig_host.match?(%r!solaris|bsd!)
end

def vanilla_windows?
  rbconfig_host.match?(%r!mswin|mingw|cygwin!) && proc_version.empty?
end

def windows?
  vanilla_windows? || bash_on_windows?
end