ruby-metaprogramming-metric

#!/bin/bash
set -euf -o pipefail

##
# How many metaprogramming methods are in your Ruby code?
#
# This script counts the occurences of these methods:
#   * eval
#   * method_missing
#   * define_method
#   * instance_variable_set
#
# The result can be useful as a guesstimate of how hard
# the code may be to maintain, analyze, port, and update:
#   * Single digits are best.
#   * Double digits should give pause.
#   * Triple digits should scare you.
#   * Quadruple digits mean run for the hills.  :)
#
# If you're running this on Rails code, you may prefer to
# use the script rails-metaprogramming-metric, which looks
# in the directories "app" and "lib/"
#
# From http://aaronblohowiak.com/rails-maintainability-metric
#
# Contact: Joel Parker Henderson (joel@joelparkerhenderson.com)
# License: GPL
# Updated: 2015-01-25
##

grep "\b\(eval\|method_missing\|define_method\|instance_variable_set\)\b"  | wc -l