Deprecate .erb-linters in favour of .erb_linters

README.md

@@ -523,11 +523,11 @@ Good ✅
 
 ## Custom Linters
 
-`erb_lint` allows you to create custom linters specific to your project. It will load linters from the `.erb-linters` directory in the root of your
+`erb_lint` allows you to create custom linters specific to your project. It will load linters from the `.erb_linters` directory in the root of your
 repository. See the [linters directory](lib/erb_lint/linters) for examples of how to write linters.
 
 ```ruby
-# .erb-linters/custom_linter.rb
+# .erb_linters/custom_linter.rb
 
 module ERBLint
   module Linters

lib/erb_lint/linter_registry.rb

@@ -3,7 +3,8 @@
 module ERBLint
   # Stores all linters available to the application.
   module LinterRegistry
-    CUSTOM_LINTERS_DIR = ".erb-linters"
+    DEPRECATED_CUSTOM_LINTERS_DIR = ".erb-linters"
+    CUSTOM_LINTERS_DIR = ".erb_linters"
     @loaded_linters = []
 
     class << self
@@ -28,6 +29,15 @@ def linters
 
       def load_custom_linters(directory = CUSTOM_LINTERS_DIR)
         ruby_files = Dir.glob(File.expand_path(File.join(directory, "**", "*.rb")))
+
+        deprecated_ruby_files = Dir.glob(File.expand_path(File.join(DEPRECATED_CUSTOM_LINTERS_DIR, "**", "*.rb")))
+        if deprecated_ruby_files.any?
+          deprecation_message = "The '#{DEPRECATED_CUSTOM_LINTERS_DIR}' directory for custom linters is deprecated. " \
+            "Please rename it to '#{CUSTOM_LINTERS_DIR}'"
+          warn(Rainbow(deprecation_message).yellow)
+          ruby_files.concat(deprecated_ruby_files)
+        end
+
         ruby_files.each { |file| require file }
       end
     end

spec/erb_lint/linter_registry_spec.rb

@@ -31,5 +31,14 @@ class FakeLinter < ERBLint::Linter
         .with(File.join(custom_directory, "custom_linter.rb")).once)
       described_class.load_custom_linters(custom_directory)
     end
+
+    it "warns when using the deprecated custom linters directory" do
+      stub_const("ERBLint::LinterRegistry::DEPRECATED_CUSTOM_LINTERS_DIR", custom_directory)
+
+      expected_warning = Rainbow("The '#{custom_directory}' directory for custom linters is deprecated. " \
+        "Please rename it to '.erb_linters'").yellow
+      expect(described_class).to(receive(:warn).with(expected_warning).once)
+      described_class.load_custom_linters
+    end
   end
 end