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module Tty
module_function
def strip_ansi(string)
string.gsub(/\033\[\d+(;\d+)*m/, "")
end
def width
(`/bin/stty size`.split[1] || 80).to_i
end
def truncate(string)
(w = width).zero? ? string.to_s : string.to_s[0, w - 4]
end
COLOR_CODES = {
red: 31,
green: 32,
yellow: 33,
blue: 34,
magenta: 35,
cyan: 36,
default: 39,
}.freeze
STYLE_CODES = {
reset: 0,
bold: 1,
italic: 3,
underline: 4,
strikethrough: 9,
no_underline: 24,
}.freeze
CODES = COLOR_CODES.merge(STYLE_CODES).freeze
def append_to_escape_sequence(code)
@escape_sequence ||= []
@escape_sequence << code
self
end
def current_escape_sequence
return "" if @escape_sequence.nil?
"\033[#{@escape_sequence.join(";")}m"
end
def reset_escape_sequence!
@escape_sequence = nil
end
CODES.each do |name, code|
define_singleton_method(name) do
append_to_escape_sequence(code)
end
end
def to_s
return "" unless $stdout.tty?
current_escape_sequence
ensure
reset_escape_sequence!
end
end
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