#!/usr/bin/env bash

function error_handler() {
  >&2 echo "Exited with BAD EXIT CODE '${2}' in ${0} script at line: ${1}."
  exit "$2"
}
trap 'error_handler ${LINENO} $?' ERR
set -o errtrace -o errexit -o nounset

# HELP: remove all unused functions from python files

if ! command -v dead >/dev/null 2>&1; then
  echo "dead is not installed. installing..."
  echo "pip install dead"
fi

list_of_unused_things="$(dead | grep -E '^[a-z].*is never read')"

while read -r line; do
  function_name="$(echo "$line" | awk '{print $1}')"
  echo "function_name: ${function_name}"
  file_name_and_line_number="$(echo "$line" | perl -p -e "s/.*is never read, defined in //g")"
  file_name="$(echo "$file_name_and_line_number" | awk -F ':' '{print $1}')"
  echo "trying to remove $function_name from: ${file_name}"
  if python bin/codemod/update_file_to_remove_function.py "$file_name" "$function_name"; then
    # TODO: run exhaustive tests, and if they pass, report success
    echo "function ${function_name} removed from ${file_name}. yay!"
    exit 0
  fi
done <<< "$list_of_unused_things"