pre-commit

#!/bin/zsh

# Redirect output to stderr.
exec 1>&2

# join_by from https://stackoverflow.com/questions/1527049/how-can-i-join-elements-of-an-array-in-bash
function join_by { local d=$1; shift; echo -n "$1"; shift; printf "%s" "${@/#/$d}"; }

# pattern is just all of these strings smushed into a big regex pattern
booboos=(
   # ruby debug tools
  'byebug'
  'binding.pry'
  'pry-rescue/minitest'
  # frontend debug tools
  'debugger'
  'console\.' # console.log, console.warn, console.error
  # frontend test limiters
  '.only('
  '.skip('
  # special comments
  'DO NOT COMMIT'
  'TODO'
  # merge tokens
  '[<>|=]\{7\}'
)
pattern=$(join_by '\|' ${booboos[@]})


if test $(git diff --cached | grep ^+\[^+] | grep -e $pattern | wc -l) != 0
then
  for file in $(git diff --cached --name-only); do
    # This next line shows the offending tokens, but it shows them from the working directory and not from the staging area.
    # TODO:  Make this show problems in the staging area instead, because that's what you're trying to commit.
    # (If the problem is fixed in the working directory but not in the staged files, this tool will puke but not show you the error)
    grep --color -Hne $pattern $file # output matches
  done

  echo "\nFound a boo-boo in your cached files."
  echo "Enter \"I'm naughty\" to continue, anything else to exit."
  vared -ce response
  if [[ ! $response == "I'm naughty" ]]
  then
    exit 1
  fi