Merge pull request #492 from miry/empty-config-load

Handle empty configuration as no configuration

spec/ameba/config_spec.cr

@@ -15,6 +15,15 @@ module Ameba
         config.globs.should eq Config::DEFAULT_GLOBS
       end
 
+      it "loads default globs when config is empty" do
+        yml = YAML.parse <<-CONFIG
+          # Empty config with comment
+
+        CONFIG
+        config = Config.new(yml)
+        config.globs.should eq Config::DEFAULT_GLOBS
+      end
+
       it "initializes globs as string" do
         yml = YAML.parse <<-CONFIG
           ---

src/ameba/config.cr

@@ -95,6 +95,9 @@ class Ameba::Config
   #
   # `Config.load` uses this constructor to instantiate new config by YAML file.
   protected def initialize(config : YAML::Any)
+    if config.raw.nil?
+      config = YAML.parse("{}")
+    end
     @rules = Rule.rules.map &.new(config).as(Rule::Base)
     @rule_groups = @rules.group_by &.group
     @excluded = load_array_section(config, "Excluded")