Change to prevent inserting ansi codes to wrap no content in ref issue …

…#4

lib/strings/wrap.rb

@@ -136,9 +136,11 @@ def format_paragraph(paragraph, wrap_at, ansi_stack)
     # @api private
     def insert_ansi(string, ansi_stack = [])
       return string if ansi_stack.empty?
+      return string if string.empty?
 
       new_stack = []
       output          = string.dup
+      length          = string.size
       matched_reset   = false
       ansi_reset      = Strings::ANSI::RESET
 
@@ -149,9 +151,10 @@ def insert_ansi(string, ansi_stack = [])
           output.insert(ansi[1], ansi_reset)
           next
         elsif !matched_reset # ansi without reset
-          output.insert(-1, ansi_reset) # add reset at the end
           matched_reset = false
           new_stack << ansi # keep the ansi
+          next if ansi[1] == length
+          output.insert(-1, ansi_reset) # add reset at the end
         end
 
         output.insert(ansi[1], ansi[0])

spec/unit/wrap/insert_ansi_spec.rb

@@ -53,13 +53,13 @@
     expect(stack).to eq([])
   end
 
-  it "removes matching paris of ANSI codes only" do
-     text = "one"
-     stack =  [["\e[32m", 0], ["\e[0m", 3], ["\e[33m", 3]]
+  it "removes matching pairs of ANSI codes only" do
+    text = "one"
+    stack =  [["\e[32m", 0], ["\e[0m", 3], ["\e[33m", 3]]
 
-     val = Strings::Wrap.insert_ansi(text, stack)
+    val = Strings::Wrap.insert_ansi(text, stack)
 
-     expect(val).to eq("\e[32mone\e[0m\e[33m\e[0m")
-     expect(stack).to eq([["\e[33m", 3]])
+    expect(val).to eq("\e[32mone\e[0m")
+    expect(stack).to eq([["\e[33m", 3]])
   end
 end