ruby-unicode-display-width - 1.6.1-1 main

When printed to the screen, the length of the string is usually equal to the
number of cells it occupies. However, there are categories of characters that
occupy 2 cells (full-wide), and others that occupy 0. This library provides
functions similar to wcwidth() and wcswidth() known from C, to determine the
monospace display width of a string.