def wrap(s, width=78)
  s.gsub(/(.{1,#{width}})(\s+|\Z)/, "\\1\n")
end
wrap("This text is too short to be wrapped.")

puts wrap("This text is not too short to be wrapped.", 20)

This text is not too
short to be wrapped.

This text is not too
short to be wrapped.

puts wrap("These ten-character columns are stifling my creativity!", 10)

These
ten-character
columns
are
stifling
my
creativity!

These
ten-character
columns
are
stifling
my
creativity!

poetry = %q{It is an ancient Mariner,
And he stoppeth one of three.
"By thy long beard and glittering eye,
Now wherefore stopp'st thou me?}
puts wrap(poetry, 20)

It is an ancient
Mariner,
And he stoppeth one
of three.
"By thy long beard
and glittering eye,
Now wherefore
stopp'st thou me?

It is an ancient
Mariner,
And he stoppeth one
of three.
"By thy long beard
and glittering eye,
Now wherefore
stopp'st thou me?

prose = %q{I find myself alone these days, more often than not,
watching the rain run down nearby windows. How long has it been
raining? The newspapers now print the total, but no one reads them
anymore.}
puts wrap(prose, 60)

I find myself alone these days, more often than not,
watching the rain run down nearby windows. How long has it
been
raining? The newspapers now print the total, but no one
reads them
anymore.

I find myself alone these days, more often than not,
watching the rain run down nearby windows. How long has it
been
raining? The newspapers now print the total, but no one
reads them
anymore.

def reformat_wrapped(s, width=78)
 s.gsub(/\s+/, " ").gsub(/(.{1,#{width}})( |\Z)/, "\\1\n")
end
def reformat_wrapped(s, width=78)
  lines = []
  line = ""
  s.split(/\s+/).each do |word|
    if line.size + word.size >= width    
      lines << line
      line = word
    elsif line.empty?
      line = word
    else
      line << " " << word
    end
  end
  lines << line if line
  return lines.join "\n"
end
puts reformat_wrapped(prose, 60)

I find myself alone these days, more often than not,
watching the rain run down nearby windows. How long has it
been raining? The newspapers now print the total, but no one
reads them anymore.

I find myself alone these days, more often than not,
watching the rain run down nearby windows. How long has it
been raining? The newspapers now print the total, but no one
reads them anymore.