class Reline::LineEditor

def vi_to_column(key, arg: 0) 

def vi_to_column(key, arg: 0)
pointer, @cursor = @line.grapheme_clusters.inject([0, 0]) { |total, gc|
tal has [byte_size, cursor]
ar_width = Reline::Unicode.get_mbchar_width(gc)
total.last + mbchar_width) >= arg
eak total
f (total.last + mbchar_width) >= @cursor_max
eak total

tal = [total.first + gc.bytesize, total.last + mbchar_width]
tal