Add features generator

xcode/build_phases/features_generator/features_generator.rb

@@ -0,0 +1,55 @@
+require 'yaml'
+require 'erb'
+
+# Input files paths
+build_settings_file_path = ARGV[0]
+generated_features_enum_file_path = ARGV[1]
+
+features_enum_template =
+"
+//MARK: - Feature toggles
+
+public enum FeatureToggles: String, Codable, RawRepresentable, CaseIterable {
+    <% for  @item in @items %>
+    case <%= @item %>
+    <% end  %>
+}
+"
+
+class FeatureUtils
+  include ERB::Util
+
+  attr_accessor :items
+
+  def initialize(items)
+    @items = items
+  end
+
+  def render(template)
+    ERB.new(template).result(binding)
+  end
+end
+
+def save(path, data)
+  unless File.exists? path
+    raise "Unable to safe features to file at #{path}"
+  else
+    File.open(path, "w") do |f|
+      f.write(data)
+    end
+  end
+end
+
+def get_features_from_file(path)
+  unless File.exists? path
+    raise "Unable to load features from file at #{path}"
+  else
+    YAML.load_file(path)
+  end
+end
+
+build_settings_features_list = get_features_from_file(build_settings_file_path)["features"]
+utils = FeatureUtils.new(build_settings_features_list)
+
+data = utils.render(features_enum_template).strip
+save(generated_features_enum_file_path, data)

xcode/build_phases/features_generator/features_generator.sh

@@ -0,0 +1,14 @@
+readonly build_settings_file_path="${PROJECT_DIR}/common/build_settings.yaml"
+readonly generated_file_path="${PROJECT_DIR}/${PRODUCT_NAME}/Resources/Features/FeatureToggles.swift"
+
+if ! [ -e ${build_settings_file_path} ]; then
+	echo "File ${PROJECT_DIR}/common/build_settings.yaml does not exist. Add this file and try again."
+	exit 1
+fi
+
+if ! [ -e ${generated_file_path} ]; then
+	echo "File ${PROJECT_DIR}/${PRODUCT_NAME}/Resources/Features/FeatureToggles.swift does not exist. Add this file and try again."
+	exit 1
+fi
+
+ruby ${PROJECT_DIR}/build-scripts/xcode/build_phases/features_generator/features_generator.rb ${build_settings_file_path} ${generated_file_path}