BASH Draw a line of characters across the screen

#!/bin/bash
######################################################################
#Copyright (C) 2018  Kris Occhipinti
#https://filmsbykris.com

#This program is free software: you can redistribute it and/or modify
#it under the terms of the GNU General Public License as published by
#the Free Software Foundation, either version 3 of the License, or
#(at your option) any later version.

#This program is distributed in the hope that it will be useful,
#but WITHOUT ANY WARRANTY; without even the implied warranty of
#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#GNU General Public License for more details.

#You should have received a copy of the GNU General Public License
#along with this program.  If not, see <http://www.gnu.org/licenses/>.
######################################################################

function main(){
  line
  line =
  echo "Welcome..."
  line +-
  line
  exit 0
}


function line(){
  if [[ $# < 1 ]]
  then
    l="█"
  else
    l="${1:0:1}"
  fi

  eval printf %.0s$l '{1..'"${COLUMNS:-$(tput cols)}"\}
  echo ""
}

main