simplify some common proxy config

proxy.sh

#!/bin/bash

# define color
RED='\033[0;31m'
GREEN='\033[0;32m'
NC='\033[0m' # No Color

function enable_proxy() {
    git config --global http.proxy "$1"
    git config --global https.proxy "$1"
    npm config set proxy "$1"
    export {all,http,https}_proxy="$1"
    echo -e "${GREEN}Proxy enabled${NC}"
}

function disable_proxy() {
    git config --global --unset http.proxy
    git config --global --unset https.proxy
    npm config delete proxy
    unset {all,http,https}_proxy
    echo -e "${RED}Proxy disabled${NC}"
}

if [ "$1" == "enable" ] && [ -n "$2" ]; then
    enable_proxy "$2"
elif [ "$1" == "disable" ]; then
    disable_proxy
else
    echo "Usage: $0 enable <proxy_url> | $0 disable"
fi