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# coding: utf-8
require "English"
class HighLine
# 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.
module Wrapper
#
# 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
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
#
# 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)
def self.actual_length(string_with_escapes)
string_with_escapes.to_s.gsub(/\e\[\d{1,2}m/, "").length
end
end
end
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