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Showing content from https://github.com/janlelis/wcswidth-ruby below:

janlelis/wcswidth-ruby: FFI bindings to libc's wcswidth() to determine the actual display width of strings

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Determine terminal display width (columns) of Ruby strings via FFI bindings to libc's wcswidth() function.

See unicode/display_width for a Ruby-only unicode data based approach.

require 'wcswidth/kernel_method'

# full width chars
wcswidth("！") # => 2
wcswidth("一") # => 2

# single width chars
wcswidth("A") # => 1
wcswidth("·") # => 1

# zero width chars
wcswidth("ֿ") # => 0
wcswidth("\0") # => 0

# control chars
wcswidth("\x01") # => -1
wcswidth("\n") # => -1

Without opting in for wcswidth/kernel_method it is Wcswidth.of("string")

Copyright (C) 2016 Jan Lelis https://janlelis.com. Released under the MIT license.

FFI bindings to libc's wcswidth() to determine the actual display width of strings

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