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# AnsiWrapper cares about Ansi Colour Code \e[...
class AnsiWrapper
TAB_TO_SPACES = 2
ANSI_REGEX = /\e\[[0-9;]*m/ # TODO: support for \x1b and \033
ANSI_RESET = "\e[0m".freeze
def self.wrap(text, length, prefix = '', continuation = prefix)
if prefix.length != continuation.length
raise "continuation <#{continuation}> should have the same length as prefix <#{prefix}>"
end
return unless text
text = text.gsub("\t", ' ' * TAB_TO_SPACES)
lines = split_text_to_lines(text, length - prefix.length)
lines = inject_continuation_and_ansi_colors_to_lines(lines, prefix, continuation)
lines.join("\n")
end
private_class_method def self.inject_continuation_and_ansi_colors_to_lines(lines, prefix, continuation)
last_ansi = ''
lines.each_with_index.map do |line, index|
current = index.zero? ? prefix : continuation
current += last_ansi unless last_ansi.empty? || last_ansi == ANSI_RESET
current += line
last_ansi = scan_for_actual_ansi(line, last_ansi)
current += ANSI_RESET if last_ansi.empty? || last_ansi != ANSI_RESET
current
end
end
private_class_method def self.scan_for_actual_ansi(line, last_ansi)
line.scan(ANSI_REGEX).each do |match|
ansi_code = match.to_s
if ansi_code == ANSI_RESET
last_ansi = ANSI_RESET
else
last_ansi += ansi_code
end
end
last_ansi
end
private_class_method def self.split_text_to_lines(text, length)
lines = text.split("\n")
sublines = lines.map do |line|
visible_length(line) > length ? visible_split(line, length) : [line]
end
sublines.flatten
end
private_class_method def self.visible_length(line)
raise 'line should not contain carriage return character!' if line.match "\n"
ansi_code_length = line.scan(ANSI_REGEX).map(&:length).sum
line.length - ansi_code_length
end
# TODO: might be refactored with less complexity
private_class_method def self.visible_split(line, length, stack = '') # rubocop:disable Metrics/AbcSize,Metrics/MethodLength
before, ansi_code, after = line.partition(ANSI_REGEX)
stack_length = visible_length(stack)
visible_length = before.length + stack_length
if visible_length == length
["#{stack}#{before}#{ansi_code}"] + visible_split(after, length)
elsif visible_length > length
first_line = stack + before[0...length - stack_length]
tail = before[length - stack_length..] + ansi_code + after
[first_line] + visible_split(tail, length)
elsif ansi_code.length.positive?
visible_split(after, length, "#{stack}#{before}#{ansi_code}")
else
["#{stack}#{before}#{ansi_code}"]
end
end
end