display current stack in prompt but only make call when changing directory

gistfile1.sh

setopt PROMPT_SUBST

pulumi()
{
  if [[ "$@" == *"stack select"* ]] then
    CURRENT_STACK=$(cat ~/.pulumi-prompt.json | jq '.currentStack' -r) && \
     jq -n --arg currentStack $CURRENT_STACK --arg previousPwd $PWD '{"currentStack":$currentStack, "previousPwd":$previousPwd, "stackChanged": true}' > ~/.pulumi-prompt.json
  fi
  /opt/homebrew/bin/pulumi "$@"
}

up_find()
{
  while [[ $PWD != / ]] ; do
      find "$PWD"/ -maxdepth 1 "$@"
      cd ..
  done
}

get_pulumi_stack()
{
  PREVIOUS_PWD=$(cat ~/.pulumi-prompt.json | jq '.previousPwd' -r)
  STACK_CHANGED=$(cat ~/.pulumi-prompt.json | jq '.stackChanged' -r)
  CURRENT_STACK=$(cat ~/.pulumi-prompt.json | jq '.currentStack' -r) && jq -n --arg currentStack $CURRENT_STACK --arg previousPwd $PWD --arg stackChanged $STACK_CHANGED '{"currentStack":$currentStack, "previousPwd":$previousPwd, "stackChanged":$stackChanged}' > ~/.pulumi-prompt.json

  if [[ $(up_find -name 'Pulumi.yaml') ]] && [[ "$PWD" != "$PREVIOUS_PWD" || $STACK_CHANGED == true ]] then
    CURRENT_STACK=$(pulumi stack --show-name)
    jq -n --arg currentStack $CURRENT_STACK --arg previousPwd $PWD '{"currentStack":$currentStack, "previousPwd":$previousPwd, "stackChanged":false}' > ~/.pulumi-prompt.json
    print "\n%F{blue}\E[3mcurrent stack: $CURRENT_STACK \E[23m "
  elif [[ $(up_find -name 'Pulumi.yaml') ]] then
    CURRENT_STACK=$(cat ~/.pulumi-prompt.json | jq '.currentStack' -r) && jq -n --arg currentStack $CURRENT_STACK --arg previousPwd $PWD '{"currentStack":$currentStack, "previousPwd":$previousPwd, "stackChanged":false}' > ~/.pulumi-prompt.json
    print "\n%F{blue}\E[3mcurrent stack: $CURRENT_STACK \E[23m "
  fi
}

PS1="\$(get_pulumi_stack)$PS1"