Add --preserve-environments option

Author: Kevin Paulisse

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

@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+# Preserve the `environments` directory from the repository when compiling the catalog. Likely
+# requires some combination of `--to-environment`, `--from-environment`, and/or `--create-symlinks`
+# to work correctly.
+# @param parser [OptionParser object] The OptionParser argument
+# @param options [Hash] Options hash being constructed; this is modified in this method.
+OctocatalogDiff::CatalogDiff::Cli::Options::Option.newoption(:preserve_environments) do
+  has_weight 501
+
+  def parse(parser, options)
+    parser.on('--[no-]preserve-environments', 'Enable or disable environment preservation') do |x|
+      options[:preserve_environments] = x
+    end
+  end
+end

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

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+require_relative '../options_helper'
+
+describe OctocatalogDiff::CatalogDiff::Cli::Options do
+  describe '#opt_preserve_environments' do
+    include_examples 'true/false option', 'preserve-environments', :preserve_environments
+  end
+end