pre-commit.rb

% cat .git/hooks/pre-commit
#! /usr/bin/env ruby

puts "pre-commit hook: checking for forgotten debug statements"

debug_statements = [
  'binding.pry',
  'console.log',
  ':focus',
  'focus: true',
  '# !!!',
]

valid = true
debug_statements.each do |stmnt|
  puts "\nstatement: #{stmnt}"
  git_cmd = 'git diff --cached'
  grep_cmd = "grep -e '^+.*#{Regexp.escape(stmnt)}'"

  output = `#{git_cmd} | #{grep_cmd}`.chomp
  puts output if output.length > 0

  if output.split("\n").length > 0
    valid = false
  else
    puts '  no matches'
  end
end

if valid
  exit(0)
else
  puts ""
  puts "\aRemove debug statements before commit"
  exit(1)
end