Method: Strings::Wrap.format_line

Defined in:
lib/strings/wrap.rb

.format_line(text_line, wrap_at, ansi_stack) ⇒ Array[String]

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Format line to be maximum of wrap_at length

Parameters:

  • text_line (String) —

    the line to format

  • wrap_at (Integer) —

    the maximum length to wrap the line

Returns:

  • (Array[String]) —

    the wrapped lines



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# File 'lib/strings/wrap.rb', line 46

def format_line(text_line, wrap_at, ansi_stack)
  lines = []
  line  = []
  word  = []
  ansi  = []
  ansi_matched = false
  word_length = 0
  line_length = 0
  char_length = 0 # visible char length
  text_length = display_width(text_line)
  total_length = 0

  UnicodeUtils.each_grapheme(text_line) do |char|
    # we found ansi let's consume
    if char == Strings::ANSI::CSI || ansi.length > 0
      ansi << char
      if Strings::ANSI.only_ansi?(ansi.join)
        ansi_matched = true
      elsif ansi_matched
        ansi_stack << [ansi[0...-1].join, line_length + word_length]
        ansi_matched = false

        if ansi.last == Strings::ANSI::CSI
          ansi = [ansi.last]
        else
          ansi = []
        end
      end
      next if ansi.length > 0
    end

    char_length = display_width(char)
    total_length += char_length
    if line_length + word_length + char_length <= wrap_at
      if char == SPACE || total_length == text_length
        line << word.join + char
        line_length += word_length + char_length
        word = []
        word_length = 0
      else
        word << char
        word_length += char_length
      end
      next
    end

    if char == SPACE # ends with space
      lines << insert_ansi(line.join, ansi_stack)
      line = []
      line_length = 0
      word << char
      word_length += char_length
    elsif word_length + char_length <= wrap_at
      lines << insert_ansi(line.join, ansi_stack)
      line = [word.join + char]
      line_length = word_length + char_length
      word = []
      word_length = 0
    else # hyphenate word - too long to fit a line
      lines << insert_ansi(word.join, ansi_stack)
      line_length = 0
      word = [char]
      word_length = char_length
    end
  end
  lines << insert_ansi(line.join, ansi_stack) unless line.empty?
  lines << insert_ansi(word.join, ansi_stack) unless word.empty?
  lines
end