npm install autocompletion for bash & zsh. Provides content of `~/.npm` as autocomplete options for `npm install` ✨ https://medium.com/@jamischarles/adding-autocomplete-to-npm-install-5efd3c424067#.8w0jzkh3w

npm_install_autocomplete_zsh

#!/usr/bin/env zsh #adding this to force silly gist highlighting. REMOVE THIS

# ZSH standalone npm install autocompletion. Add this to ~/.zshrc file.
_npm_install_completion() {
	local si=$IFS

	# if 'install' or 'i ' is one of the subcommands, then...
	if [[ ${words} =~ 'install' ]] || [[ ${words} =~ 'i ' ]]; then

		# add the result of `ls ~/.npm` (npm cache) as completion options
		compadd -- $(COMP_CWORD=$((CURRENT-1)) \
			COMP_LINE=$BUFFER \
			COMP_POINT=0 \
			ls ~/.npm -- "${words[@]}" \
			2>/dev/null)
	fi

	IFS=$si
}

compdef _npm_install_completion 'npm'
## END ZSH npm install autocompletion