Fix regression re: incorrect glob pattern for folders (#546)

spec/ameba/glob_utils_spec.cr

@@ -23,6 +23,12 @@ module Ameba
           .should_not contain current_file_path
       end
 
+      it "doesn't return rejected folders" do
+        subject
+          .find_files_by_globs(["**/*_spec.cr", "!spec"])
+          .should be_empty
+      end
+
       it "doesn't return duplicated globs" do
         subject
           .find_files_by_globs(["**/*_spec.cr", "**/*_spec.cr"])
@@ -47,6 +53,10 @@ module Ameba
           fail "#{path.inspect} should be a file" unless File.file?(path)
         end
       end
+
+      it "expands folders" do
+        subject.expand(["spec"]).should_not be_empty
+      end
     end
   end
 end

src/ameba/glob_utils.cr

@@ -25,11 +25,13 @@ module Ameba
       globs
         .flat_map do |glob|
           if File.directory?(glob)
-            glob += "/**/*.cr"
+            ext = ".cr"
 
             Ameba.ecr_supported? do
-              glob += "/**/*.ecr"
+              ext = ".{cr,ecr}"
             end
+
+            glob += "/**/*#{ext}"
           end
 
           Dir[glob]