Git hook to avoid commit debug lines (binding.pry console.log debugger...)

pre-commit

#!/usr/bin/env ruby

# modified from https://gist.github.com/wacko/62560b45c1d191859d6b
# Added custom phrase, made greps case insensitive

# Validates that you don't commit forbidden keywords to the repo
# You can skip this checking with 'git commit --no-verify'

exit 0 if ARGV.include?('--no-verify')
# Update this list with your own forbidden keywords
# Does not handle spaces (use dots (.) instead)
KEYWORDS = %w(binding.pry console.log debugger JSW.was.here)


def red(text)    "\033[31m#{text}\033[0m"; end
def yellow(text) "\033[33m#{text}\033[0m"; end

# list all the files staged for commit
files_changed = %x(git diff --cached --name-only --).split

# search files for keywords
%x(git grep -q -E -i "#{KEYWORDS.join('|')}" #{files_changed.join(' ')})
if $?.exitstatus.zero?
  puts "# Check following lines:"
  files_changed.each do |file|
    KEYWORDS.each do |keyword|
      %x(git grep -q -i #{keyword} #{file})
      if $?.exitstatus.zero?
        line = %x(git grep -n -i #{keyword} #{file} | awk -F ":" '{print $2}').split.join(', ')
        puts "#\t#{red(file)}:#{line} contains #{yellow keyword}."
      end
    end
  end
  puts "Use 'git commit --no-verify' to skip this validation"
  exit 1
end

To use space on your keywords I think you just need to change the array syntax:
KEYWORDS = ["binding.pry", "console.log", "debugger" "JSW was here"]

and add quotes on the bash commands for the keywords:
%x(git grep -q -i '#{keyword}' #{file}) (line 27)

line = %x(git grep -n -i '#{keyword}' #{file} | awk -F ":" '{print $2}').split.join(', ') (line 30)