tabularize.bash

# format tab-delimited lines to table with borders


# compute width of each column

column_width=()
text=''
while read -r line
do
        text=$text${text:+$'\n'}$line
        IFS=$'\t'
        cells=($line)
        IFS=$'\n\t '

        column=0
        for cell in "${cells[@]}"
        do
                width=${#cell}
                if [ -z "${column_width[$column]}" ] || [ $width -gt "${column_width[$column]}" ]
                then
                        column_width[$column]=$width
                fi
                let column++
        done
done


# compose the format string

fmt=''
segments=()
for column in "${!column_width[@]}"
do
        fmt="$fmt|%${column_width[$column]}s"
        segments+=('')
done
fmt="$fmt|"

vborder=`printf -- "$fmt\n" "${segments[@]}" | tr "| " "+-"`


# print the table

while read -r line
do
        IFS=$'\t'
        cells=($line)
        IFS=$'\n\t '

        echo "$vborder"
        printf -- "$fmt\n" "${cells[@]}"
done <<<"$text"
echo "$vborder"