# frozen_string_literal: true

module CSVPP
  # Provides utility functions for determining OS and OS-specific system calls.
  module OS
    module_function

    # http://stackoverflow.com/a/171011/1314848.
    def windows?
      !!(/cygwin|mswin|mingw|bccwin|wince|emx/ =~ ruby_platform)
    end

    def unix?
      !windows?
    end

    def mac?
      !!(/darwin/ =~ ruby_platform)
    end

    def linux?
      unix? && !mac?
    end

    def open(str, open_cmd: self.open_cmd)
      system "#{open_cmd} #{str}"
    end

    def open_cmd
      if mac?
        'open'
      elsif linux?
        'xdg-open'
      elsif windows?
        'START ""'
      else
        raise 'Unsupported OS'
      end
    end

    def pager
      return nil if windows?
      ENV['PAGER'] || 'less'
    end

    def ruby_platform
      RUBY_PLATFORM
    end
  end
end