yarn <tab><tab> autocomplete with yarn commands from yarn --help. yarn run <tab><tab> autocomplete with scripts from package.json

yarn_tab_autocomplete.sh

#/bin/bash

_yarn(){
  if [ "$2" = "" ]; then SEARCH_PATTERN="."; else SEARCH_PATTERN=$2
  fi
  if [ "$3" == "run" ]; then
    COMPREPLY=( $(cat package.json | jq '.scripts | keys[]' | tr -d \" | grep -E ^$SEARCH_PATTERN | tr \\n ' ') )
  else
    COMPREPLY=( $(yarn --help | grep -e "-\s" | tr -d '\- ' | grep -E ^$SEARCH_PATTERN  | tr -d ' ' | tr \\n ' ') )
  fi
}
complete -F _yarn yarn