Add mutual exclusivity of --hiera-path and --hiera-path-strip

Author: Kevin Paulisse

lib/octocatalog-diff/catalog-diff/cli/options/hiera_path.rb

@@ -7,6 +7,8 @@
 
   def parse(parser, options)
     parser.on('--hiera-path PATH', 'Path to hiera data directory, relative to top directory of repository') do |path_in|
+      raise ArgumentError, '--hiera-path and --hiera-path-strip are mutually exclusive' if options.key?(:hiera_path_strip)
+
       options[:hiera_path] = path_in
 
       if options[:hiera_path].start_with?('/')

lib/octocatalog-diff/catalog-diff/cli/options/hiera_path_strip.rb

@@ -6,6 +6,8 @@
 
   def parse(parser, options)
     parser.on('--hiera-path-strip PATH', 'Path prefix to strip when munging hiera.yaml') do |path_in|
+      raise ArgumentError, '--hiera-path and --hiera-path-strip are mutually exclusive' if options.key?(:hiera_path)
+
       options[:hiera_path_strip] = path_in
     end
   end

spec/octocatalog-diff/tests/catalog-diff/cli/options/hiera_path_spec.rb

@@ -19,5 +19,11 @@
     it 'should error if empty' do
       expect { run_optparse(['--hiera-path', '']) }.to raise_error(ArgumentError, /must not be empty/)
     end
+
+    it 'should error if --hiera-path and --hiera-path-strip are both specified' do
+      expect do
+        run_optparse(['--hiera-path', 'foo', '--hiera-path-strip', 'bar'])
+      end.to raise_error(ArgumentError, /mutually exclusive/)
+    end
   end
 end