script for adding new plugin to zsh

addPlugins.sh

# for example, 
# plugins=(git)
# will become :
# plugins=(git zsh-autosuggestions)
# with "addPlugin zsh-autosuggestions"

# add below function to ~/.zsrc, then reload with 'source ~/.zshrc'
addPlugin() {  l=`cat ~/.zshrc 
             | grep -n '^plugins=.*$' 
             | cut -f1 -d:`; 
             gsed -r -i ''"$l"'s/\)/ '"$1"'\)/g' ~/.zshrc; 
             echo "zsh plugins updated."; }