idempotent-git-clone.sh

#!/bin/bash

function clone() {
   repo=$1 # https://github.com/fatih/vim-go.git
   dest=$2 # ~/.vim/pack/plugins/start/vim-go
   mkdir -p $dest
   cd $dest
   git init
   if ! git config remote.origin.url &> /dev/null;then
	   git remote add origin $repo
   fi
   git fetch origin master
   git reset origin/master # --hard to wipe everything but that's dangerous
}