Output box around text bash

box.sh

#!/bin/bash

function box() {
  LEN=`expr "$1" : '.*'`
  LINE=`printf "%${LEN}s" | tr " " "━"`
  printf "┏━%s━┓\n" "$LINE"
  printf "┃ %s ┃\n" "$1"
  printf "┗━%s━┛\n" "$LINE"
}

function cbox() {
  LEN=`expr "$1" : '.*'`
  WIDTH=`tput cols`
  PLEN=$((($WIDTH-$LEN-4)/2))
  PAD=`printf "%${PLEN}s" | tr " " " "`
  LINE=`printf "%${LEN}s" | tr " " "━"`
  printf "%s┏━%s━┓\n" "$PAD" "$LINE"
  printf "%s┃ %s ┃\n" "$PAD" "$1"
  printf "%s┗━%s━┛\n" "$PAD" "$LINE"
}

box "$1"