A simple Wrapper module that is aware of ANSI escape codes. It compensates for the ANSI escape codes so it works on the actual (visual) line length.
Returns the length of the passed string_with_escapes
, minus
and color sequence escapes.
@param string_with_escapes [String] any ANSI colored String @return [Integer] length based on the visual size of the String
(without the escape codes)
# File lib/highline/wrapper.rb, line 48 def self.actual_length(string_with_escapes) string_with_escapes.to_s.gsub(/\e\[\d{1,2}m/, "").length end
Wrap a sequence of lines at wrap_at characters per line. Existing newlines will not be affected by this process, but additional newlines may be added.
@param text [String] text to be wrapped @param wrap_at [#to_i] column count to wrap the text into
# File lib/highline/wrapper.rb, line 16 def self.wrap(text, wrap_at) return text unless wrap_at wrap_at = Integer(wrap_at) wrapped = [] text.each_line do |line| # take into account color escape sequences when wrapping wrap_at += (line.length - actual_length(line)) while line =~ /([^\n]{#{wrap_at + 1},})/ search = Regexp.last_match(1).dup replace = Regexp.last_match(1).dup index = replace.rindex(" ", wrap_at) if index replace[index, 1] = "\n" replace.sub!(/\n[ \t]+/, "\n") line.sub!(search, replace) else line[$LAST_MATCH_INFO.begin(1) + wrap_at, 0] = "\n" end end wrapped << line end wrapped.join end