add icinga2_version fact for Windows

lib/facter/icinga2_version.rb

@@ -1,7 +1,21 @@
 Facter.add('icinga2_version') do
   confine { Facter::Core::Execution.which('icinga2') }
+  confine kernel: 'linux'
   setcode do
     icinga2_ver = Facter::Core::Execution.execute("icinga2 -V|grep 'version: r'")
     icinga2_ver.match(%r{\d+\.\d+\.\d+})[0] if icinga2_ver
   end
 end
+
+Facter.add('icinga2_version') do
+  confine kernel: 'windows'
+  setcode do
+    file = if tmp = Facter::Core::Execution.which('icinga2.exe')
+      tmp
+    else
+      'C:/Program Files/ICINGA2/sbin/icinga2.exe'
+    end
+    cmd  = "#{file.split(':').first}:\"#{file.split(':').last.tr('/', '\\')}\" -V 2>&1"
+    Facter::Core::Execution.execute("cmd /C #{cmd}").lines.grep(%r{version: (r|v)?\d+\.\d+\d+}).first.split(':').last.delete('vr)').strip if File.executable?(file)
+  end
+end