#!/bin/sh
function add() {
    echo $1 >> .gitignore
}
function del() {
    if [ -f '.gitignore' ]; then
        if [ "$(cat .gitignore|wc -l)" = "1" ]
        then rm .gitignore
        else sed -i "/$1/d" .gitignore
        fi
    else echo "[.gitignore] File not found."
    fi
}
function edit() {
    sed -in "s|$1|$2|g" .gitignore
}
function show() {
    if [ -f '.gitignore' ]; then
        if [ -f '/usr/bin/bat' ]
        then bat .gitignore
        else cat .gitignore
        fi
    else echo "[.gitignore] File not found."
    fi
}

case "$1" in
    add|a)  shift; add  "$@"       ;;
    del|d)  shift; del  "$@"       ;;
    mv)     shift; edit "$@"       ;;
    show|s) shift; show            ;;
    help) echo "add/a   - filename add to ignore"
          echo "del/d   - filename del from ignore"
          echo "mv      - oldname newname chage file name"
          echo "show/s  - show ignore file"
    ;;
    *) echo "Command is not valid" ;;
esac