pots

#!/bin/bash
#******************************************************************************
#
# * File: pots
#
# * Author:  Umut Sevdi
# * Created: 08/20/22
# * Description: Program of the Session - Displays a random program in the
# /bin directory that has ${man} and ${whatis}

#*****************************************************************************

# Set default border size. Border size is 80 or terminal_size
terminal_size=$(tput cols)
max_length=$((terminal_size > 80 ? 80 : terminal_size))

Print() {
    # Update length to length-length_of_command
    max_length=$(($max_length-`wc -m <<< $cmd`))
    # Fold the text
#    cmd_info="`fold -w $max_length <<< $cmd_info`"
    line="$cmd\e[;0m${cmd_info//$cmd/}\e[36;1m"
    line_count=$((`echo $line | wc -m ` -13 )) 
    echo -e "\e[36;1m┌`seq -s─ $line_count | tr -d '[:digit:]'`┐"
    echo -e │$line │
    echo -e "└`seq -s─ $line_count | tr -d '[:digit:]'`┘\e[0m"
}

# Get command with a related info
for arg in $@; do
    cmd=$arg
    cmd_info=`whatis $cmd 2> /dev/null`
    [ -z "$cmd_info"  ] && `echo -e "Error: $cmd No such file or directory." 1>&2` || Print
done

if [ -z "$cmd" ]; then
    while [ -z "$cmd_info" ]; do
        cmd="`ls /bin/ | shuf -n 1`"
        cmd_info=`whatis $cmd 2> /dev/null`
    done
    Print
fi