Tracer.add_filter should support block and Proc object

Original Tracer.add_filter is implemented by "def add_filter(p = proc)". It
means that original Tracer.add_filter supports block and Proc object.

lib/tracer.rb

@@ -142,7 +142,8 @@ class Tracer
     stdout.print "Trace off\n" if Tracer.verbose?
   end
 
-  def add_filter(&p) # :nodoc:
+  def add_filter(p = nil, &b) # :nodoc:
+    p ||= b
     @filters.push p
   end
 
@@ -249,7 +250,7 @@ class Tracer
   #   })
 
   def Tracer.set_get_line_procs(file_name, &p)
-    Single.set_get_line_procs(file_name, p)
+    Single.set_get_line_procs(file_name, &p)
   end
 
   ##
@@ -261,7 +262,8 @@ class Tracer
   #     "Kernel" == klass.to_s
   #   end
 
-  def Tracer.add_filter(&p)
+  def Tracer.add_filter(p = nil, &b)
+    p ||= b
     Single.add_filter(p)
   end
 end

test/test_tracer.rb

@@ -53,4 +53,77 @@ require 'tracer'
       end
     end
   end
+
+  def test_tracer_by_add_filter_with_block
+    Dir.mktmpdir("test_ruby_tracer") do |dir|
+      script = File.join(dir, "require_tracer.rb")
+      open(script, "w") do |f|
+        f.print <<-'EOF'
+require 'tracer'
+
+class Hoge
+  def Hoge.fuga(i)
+    "fuga #{i}"
+  end
+end
+
+Tracer.add_filter {|event, file, line, id, binding, klass|
+  event =~ /line/ and klass.to_s =~ /hoge/i
+}
+Tracer.on
+for i in 0..3
+  puts Hoge.fuga(i) if i % 3 == 0
+end
+Tracer.off
+        EOF
+      end
+      assert_in_out_err([script]) do |(*lines), err|
+        expected = [
+          "#0:#{script}:5:Hoge:-:     \"fuga \#{i}\"",
+          "fuga 0",
+          "#0:#{script}:5:Hoge:-:     \"fuga \#{i}\"",
+          "fuga 3"
+        ]
+        assert_equal(expected, lines)
+        assert_empty(err)
+      end
+    end
+  end
+
+  def test_tracer_by_add_filter_with_proc
+    Dir.mktmpdir("test_ruby_tracer") do |dir|
+      script = File.join(dir, "require_tracer.rb")
+      open(script, "w") do |f|
+        f.print <<-'EOF'
+require 'tracer'
+
+class Hoge
+  def Hoge.fuga(i)
+    "fuga #{i}"
+  end
+end
+
+a_proc_to_add_filter = proc {|event, file, line, id, binding, klass|
+  event =~ /line/ and klass.to_s =~ /hoge/i
+}
+Tracer.add_filter(a_proc_to_add_filter)
+Tracer.on
+for i in 0..3
+  puts Hoge.fuga(i) if i % 3 == 0
+end
+Tracer.off
+        EOF
+      end
+      assert_in_out_err([script]) do |(*lines), err|
+        expected = [
+          "#0:#{script}:5:Hoge:-:     \"fuga \#{i}\"",
+          "fuga 0",
+          "#0:#{script}:5:Hoge:-:     \"fuga \#{i}\"",
+          "fuga 3"
+        ]
+        assert_equal(expected, lines)
+        assert_empty(err)
+      end
+    end
+  end
 end