Merge pull request #164 from abf/rosa-build:fix_truncating_filename

fix truncating filename in web git file tree view

lib/ext/core/string.rb

@@ -24,15 +24,13 @@ class String
 
   # same as reverse.truncate.reverse
   def rtruncate(length, options = {})
-    text = self.dup
+    chars = self.dup.mb_chars
+    return self if chars.length <= length
     options[:omission] ||= "..."
     options[:separator] ||= '/'
 
-    length_with_room_for_omission = length - options[:omission].mb_chars.length
-    chars = text.mb_chars
-    stop = options[:separator] ?
-      (chars.index(options[:separator].mb_chars, length_with_room_for_omission) || length_with_room_for_omission) : length_with_room_for_omission
-
-    (chars.length > length ? "#{options[:omission]}#{chars[-(stop+1)...-1]}" : text).to_s
+    start = chars.length - length + options[:omission].mb_chars.length
+    stop = options[:separator] ? (chars.index(options[:separator].mb_chars, start) || start) : start
+    "#{options[:omission]}#{chars[stop..-1]}".to_s
   end
 end