OS Detection via Ruby

[DerVVulfman]

OS Detection via Ruby
Version 1.2

Description
While most RPGMaker games are designed for users of the Windows Platform, not everyone who plays games are Windows users.  So what of those custom scripts that use the Win32DLL?  They won't work on their PCs!  This scriptette will determine what OS the player is using.  And if used properly, a scripter/coder can write something to turn off those custom Win32API dll systems (if possible for their game).



Script

The Code

Code:

#==============================================================================
# ** OS Detection via Ruby  v 1.2
#------------------------------------------------------------------------------
#    by DerVVulfman (09/09/2019) MM/DD/YYYY
#    based on the work of Thomas Enebo (11/27/2012) MM/DD/YYYY
#==============================================================================



#==============================================================================
# ** Operating System Detection
#------------------------------------------------------------------------------
#  This module actively uses the RbConfig system to detect what operating
#  system is in use.  The below code is sound, the RbConfig used above is
#  merely a snippet of the whole.
#
#  Refer to OS_Detect.execute to perform detection operation
#  Refer to OS_Detect.version to acquire OS after generation
#==============================================================================

module OS_Detect
  #--------------------------------------------------------------------------
  # * Methods/Functions Executable From Outside Call
  #--------------------------------------------------------------------------
  module_function 
  #--------------------------------------------------------------------------
  # * Object Execution
  #--------------------------------------------------------------------------
  def execute
    # Only perform if not F12 Reset
    if $@.nil?
      # Set Default
      @version = :unknown
      @os ||= (
        host_os = RUBY_PLATFORM
        case host_os
        when /mswin|msys|mingw|cygwin|bccwin|wince|emc/
          @version = :windows
        when /darwin|mac os/
          @version = :macosx
        when /linux/
          @version = :linux
        when /solaris|bsd/
          @version = :unix
        end
      )
    end
  end
  #--------------------------------------------------------------------------
  # * Get OS version (:windows, :macosz, :linux, :unix, :unknown)
  #--------------------------------------------------------------------------
  def version
    return @version
  end 
end

Example Calls
OS_Detect.execute to generate it.
p OS_Detect.version to print it after generating.
This generates the result of  :windows  for most users



Notes
Normally, if you run RUBY_PLATFORM while using Java, your response would always be 'Java'.... even if running Mac or Windows.  This version instead demands a comparison and should distinguish even if running Java as well.



Compatability
Since it contains no modules or classes, it should work with all Ruby-Based RPGMaker Engines.



Credits and Thanks
Well, to enough people at stackoverflow that said not to use the RUBY_PLATFORM command.  But specific thanks to Thomas Enebo at Stack Overflow that wrote the basis for this script.  Not that he helped me figure out the RbConfig file.



Terms of Use
Free for use, even within commercial products.  But due credit to both myself and Thomas Enebo is required.

[kyonides]

So far it only includes a scepter's defined hash value that isn't reliable at all. For example, if I copy and paste it in my projects located in my ext4 partition, it will say it's running on Windows even if it's actually my Kubuntu Bionic, a GNU/Linux OS. It might only work properly if you had installed Ruby on your OS already. Something that might be more reliable might be the availability of certain Ruby methods only available for Linux compatible OS's, check its permission system or the existence of specific default directories or even better, getting access to the host OS's PATH variable and extract one of its default directories for testing purposes.

[DerVVulfman]

You have a point. Unfortunately, every RBConfig I found compiled was for a Windows environment... so everything I searched was skewed in that direction. So.... I just took another.

BUMP
to Version 1.1

True enough, I'm back to using RUBY_PLATFORM, but I'm not asking it to return which system. I'm forcing a comparison to specific systems and ignoring any Java returns.

[kyonides]

Or just use the short version of it. No need to credit me since it only excludes insignificant details not really needed to run the script

Code:

class OSError < StandardError
end
module OS_Detect
  def self.execute
    @os ||= case RUBY_PLATFORM
    when /mswin|msys|mingw|cygwin|bccwin|wince|emc/
      :windows
    when /darwin|mac os/
      :macosx
    when /linux/
      :linux
    when /solaris|bsd/
      :unix
    else
      raise OSError, "unknown os: #{RUBY_PLATFORM.inspect}"
    end
  end
end

I had to replace the error message he provided because it would cause you to read a non related error message instead! Something like NameError: No Error class or module found.