#!/bin/bash
# info: list system shells
# options: [FORMAT]
#
# The function for obtaining the list of system shells.


#----------------------------------------------------------#
#                    Variable&Function                     #
#----------------------------------------------------------#

# Argument definition
format=${1-shell}

# Includes
source $VESTA/func/main.sh

# JSON list function
json_list() {
    sh_counter=$(echo "$shells" | wc -l)
    i=1
    echo '['
    for shell in $shells; do
        if [ "$i" -lt "$sh_counter" ]; then
            echo -e  "\t\"$shell\","
        else
            echo -e  "\t\"$shell\""
        fi
        (( ++i))
    done
    echo "]"
}

# SHELL list function
shell_list() {
    echo "SHELL"
    echo "-----"
    for shell in $shells; do
        echo "$shell"
    done
}

# PLAIN list function
plain_list() {
    for shell in $shells; do
        echo "$shell"
    done
}

# CSV list function
csv_list() {
    echo "SHELL"
    for shell in $shells; do
        echo "$shell"
    done
}


#----------------------------------------------------------#
#                       Action                             #
#----------------------------------------------------------#

# Defining system shells
shells=$(grep -v '#' /etc/shells |awk -F '/' '{print $NF}' |sort -u)

# Listing data
case $format in
    json)   json_list ;;
    plain)  plain_list ;;
    csv)    csv_list ;;
    shell)  shell_list ;;
esac


#----------------------------------------------------------#
#                       Vesta                              #
#----------------------------------------------------------#

exit