Added Dir#each_child iterator

spec/std/dir_spec.cr

@@ -277,6 +277,21 @@ describe "Dir" do
       filenames << filename
     end
 
+    filenames.includes?(".").should be_true
+    filenames.includes?("..").should be_true
+    filenames.includes?("dir_spec.cr").should be_true
+  end
+
+  it "gets child iterator" do
+    filenames = [] of String
+
+    iter = Dir.new(__DIR__).each_child
+    iter.each do |filename|
+      filenames << filename
+    end
+
+    filenames.includes?(".").should be_false
+    filenames.includes?("..").should be_false
     filenames.includes?("dir_spec.cr").should be_true
   end
 

src/dir.cr

@@ -100,6 +100,10 @@ class Dir
     end
   end
 
+  def each_child
+    ChildIterator.new(self)
+  end
+
   # Returns an array containing all of the filenames except for `.` and `..`
   # in the given directory.
   def children : Array(String)
@@ -305,6 +309,27 @@ class Dir
       self
     end
   end
+
+  private struct ChildIterator
+    include Iterator(String)
+
+    def initialize(@dir : Dir)
+    end
+
+    def next
+      excluded = {".", ".."}
+      loop do
+        break unless entry = @dir.read
+        return entry unless excluded.includes?(entry)
+      end
+      stop
+    end
+
+    def rewind
+      @dir.rewind
+      self
+    end
+  end
 end
 
 require "./dir/*"