let your command line program surf via proxy by adding one letter

use-proxy

#!/bin/bash
# you can set alias p="use-proxy" in your .bashrc or .zshrc
# then you can type: p curl https://google.com
set -e

usage () {
	echo "use-proxy [-u] <command>"
	exit 127
}

[ $# -eq 0 ] && usage

echo "will run $@"
export https_proxy=127.0.0.1:1235
export http_proxy=127.0.0.1:1235
while getopts ":u" opt; do
	case $opt in
		u)
			shift
			exec sudo "$@"
			exit 1
			;;
		\?)
			usage
			;;
	esac
done

if [ -z $(which $1) ]; then
	zsh -c "source ~/.zshrc; https_proxy=127.0.0.1:1235 http_proxy=127.0.0.1:1235 $1"
else
	exec "$@"
fi

update to support function

and also avoid function not found due to the lack of login shell profile