UTF8

- Added more UTF8 unit tests for calculating string length, string width,
  formatted string length, formatted string width.
- Implemented UTF8 text width method for symmetry.

src/utf8.cpp

@@ -244,6 +244,32 @@ unsigned int utf8_text_length (const std::string& str)
   return charLength;
 }
 
+////////////////////////////////////////////////////////////////////////////////
+unsigned int utf8_text_width (const std::string& str)
+{
+  bool in_color = false;
+
+  unsigned int length = 0;
+  std::string::size_type i = 0;
+  unsigned int c;
+  while ((c = utf8_next_char (str, i)))
+  {
+    if (in_color)
+    {
+      if (c == 'm')
+        in_color = false;
+    }  
+    else if (c == 033)
+    {
+      in_color = true;
+    }
+    else
+      length += mk_wcwidth (c);
+  }
+
+  return length;
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 const std::string utf8_substr (
   const std::string& input,