#!/bin/sh
add() {
    local file="$1"
    echo $file >> .gitignore
}
del() {
    local file="$1"
    sed -i "/$file/d" .gitignore
}
edit() {
    local oldname="$1"
    local newanme="$2"
    sed -in "s|$oldname|$newanme|g" .gitignore
}
show() {
    if [ -f '/usr/bin/bat' ]
    then
        bat .gitignore
    else
        cat .gitignore
    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  - show ignore file"
    ;;
    *) echo "Command is not valid"
esac