Convert csv to ascii table (mysql style)

csv2ascii.ksh

#!/bin/ksh
# Dennis Ullrich
# Version 1.0-0 (2017-07-01)
# [email protected]

csv2ascii(){
if [[ $# -ne 2 ]]; then
        echo "$0 [separator] [file or \"-\" for stdin]"
        return false
fi

# Variables
separator="$1"
input="`cat $2`" || return $?

# Internal vars
max=( 0 )
format="|"
spacer="+"

# Get max character count per field
while read line; do
        IFS="$separator" array=( $line )
        for i in ${!array[*]}; do
                [[ ${#array[i]} -gt ${max[i]} ]] && max[i]=${#array[i]}
        done
done <<< "${input}"

# Build printf format string and spacer
for i in ${max[*]}; do
        format+=" %-${i}b |"
        spacer+="-$(printf '\-%.0s' {1..$i})-+"

        # If bash is used:
        #spacer+="-$(printf "%${i}s" "-")-+"
done
# If bash is used:
#spacer="${spacer// /-}"

# Ascii table output
i=0
echo "$spacer"
while read line; do
        IFS="$separator" printf "${format}\n" ${line}
        # Spacer to separate headline from body
        # This causes trouble if bash is used - rewrite it as if []; then ... fi
        [[ $i -eq 0 ]] && { echo "$spacer"; ((i++)) }
done <<< "${input}"
echo "$spacer"

}

csv2ascii $@