Add splunk_version fact

lib/facter/splunk_version.rb

@@ -0,0 +1,17 @@
+Facter.add(:splunk_version) do
+  setcode do
+    value = nil
+    cmd = if File.exist?('C:/Program Files/Splunk/bin/splunk.exe')
+            '"C:/Program Files/Splunk/bin/splunk.exe" --version'
+          elsif File.exist?('/opt/splunk/bin/splunk')
+            '/opt/splunk/bin/splunk --version'
+          end
+    if cmd
+      output = Facter::Util::Resolution.exec(cmd)
+      if output =~ %r{^Splunk ([0-9\.]+) \(} # rubocop:disable Style/IfUnlessModifier
+        value = Regexp.last_match(1)
+      end
+    end
+    value
+  end
+end

spec/unit/facter/splunk_version_spec.rb

@@ -0,0 +1,26 @@
+require 'spec_helper'
+
+describe 'splunk_version Fact' do
+  before do
+    Facter.clear
+  end
+
+  it 'returns version for Windows' do
+    allow(File).to receive(:exist?).with('C:/Program Files/Splunk/bin/splunk.exe').and_return(true)
+    allow(Facter::Util::Resolution).to receive(:exec).with('"C:/Program Files/Splunk/bin/splunk.exe" --version').and_return('Splunk 6.6.8 (build 6c27a8439c1e)')
+    expect(Facter.fact(:splunk_version).value).to eq('6.6.8')
+  end
+
+  it 'returns version for Linux' do
+    allow(File).to receive(:exist?).with('C:/Program Files/Splunk/bin/splunk.exe').and_return(false)
+    allow(File).to receive(:exist?).with('/opt/splunk/bin/splunk').and_return(true)
+    allow(Facter::Util::Resolution).to receive(:exec).with('/opt/splunk/bin/splunk --version').and_return('Splunk 6.6.8 (build 6c27a8439c1e)')
+    expect(Facter.fact(:splunk_version).value).to eq('6.6.8')
+  end
+
+  it 'returns nil' do
+    allow(File).to receive(:exist?).with('C:/Program Files/Splunk/bin/splunk.exe').and_return(false)
+    allow(File).to receive(:exist?).with('/opt/splunk/bin/splunk').and_return(false)
+    expect(Facter.fact(:splunk_version).value).to be_nil
+  end
+end