add support for combining characters

[tos-kamiya]

Add support for combining characters of Unicode.

This patch uses wcwidth package to compute width of characters,
in order to render strings including combining characters such as "ā".

E.g., the code:

from texttable import Texttable
table = Texttable()
table.set_cols_align(["l", "r", "r"])
table.add_rows([
    ["str", "code-point\nlength", "display\nwidth"],
    ["a\u0304", 2, 1],
    ["a", 1, 1],
])
print(table.draw())

will output:

+-----+------------+---------+
| str | code-point | display |
|     |   length   |  width  |
+=====+============+=========+
| ā   |          2 |       1 |
+-----+------------+---------+
| a   |          1 |       1 |
+-----+------------+---------+

Regards,

[foutaise]

Hi tos-kamiya,

Thanks for your PR. I've made a simple commit (0708de4) in order to fix the combining char issue, without the need to depend on another external package. Will consider using wcwidth if other corner cases arise. A new release will follow.

Best regards,

[tos-kamiya]

Hi @foutaise ,

I'm glad to hear that Texttable will renders such characters in the next release.

Thank you for this pretty useful product and making it care about multi-byte characters!

Regards,