Git pre-commit hook for a rails project. Add it to your `repo/.git/hooks/pre-commit` file and make sure it has +x permission.

pre-commit

#!/bin/bash
#
# ref: https://gist.github.com/ppdeassis/48387d9f49b41af23e7d
#
# install into git dir:
#   curl \
#     -fSL https://gist.githubusercontent.com/ppdeassis/48387d9f49b41af23e7d/raw/64af0d58321cd1d89fdb461995bc3560153cb7e2/pre-commit \
#     -o .git/hooks/pre-commit \
#   && chmod +x .git/hooks/pre-commit
#

if git-rev-parse --verify HEAD >/dev/null 2>&1; then
    against=HEAD
else
    against=4b825dc642cb6eb9a060e54bf8d69288fbee4904
fi


for FILE in $(git diff-index --name-only $against) ; do

  # skipping removed files
  if [ ! -f "$FILE" ]; then
    continue
  fi

  if [[ $FILE =~ .rb$ ]]; then

    if [[ $FILE =~ (_spec|_test).rb$ ]]; then
      # rspec/focus:
      if grep "focus: true do" "$FILE" | grep -q -v '^[[:space:]]*#'; then
        echo "[ERROR] $FILE contains :focus meta key!"
        exit 1
      fi

      # rspec/focus:
      if grep ":focus do" "$FILE" | grep -q -v '^[[:space:]]*#'; then
        echo "[ERROR] $FILE contains :focus meta key!"
        exit 1
      fi

      # rspec/focus:
      if grep " fit " "$FILE" | grep -q -v '^[[:space:]]*#'; then
        echo "[ERROR] $FILE contains fit spec!"
        exit 1
      fi

      # rspec/focus:
      if grep " fcontext " "$FILE" | grep -q -v '^[[:space:]]*#'; then
        echo "[ERROR] $FILE contains fcontext spec!"
        exit 1
      fi

      # rspec/focus:
      if grep " fdescribe " "$FILE" | grep -q -v '^[[:space:]]*#'; then
        echo "[ERROR] $FILE contains fdescribe spec!"
        exit 1
      fi

      # rspec/focus:
      if grep " fscenario " "$FILE" | grep -q -v '^[[:space:]]*#'; then
        echo "[ERROR] $FILE contains fscenario spec!"
        exit 1
      fi

      # rspec/focus:
      if grep " ffeature " "$FILE" | grep -q -v '^[[:space:]]*#'; then
        echo "[ERROR] $FILE contains ffeature spec!"
        exit 1
      fi

      # minitest/focus: grep para "focus\n"
      if grep "focus$" "$FILE" | grep -q -v '^[[:space:]]*#'; then
        echo "[ERROR] $FILE contains :focus meta key!"
        exit 1
      fi

      # minitest/focus:
      if grep " ftest " "$FILE" | grep -q -v '^[[:space:]]*#'; then
        echo "[ERROR] $FILE contains :focus meta key!"
        exit 1
      fi

      if grep " puts " "$FILE" | grep -q -v '^[[:space:]]*#'; then
        echo "[ERROR] $FILE contains puts!"
        exit 1
      fi
    fi

    # Check if the file contains 'byebug'
    if grep "byebug" "$FILE" | grep -q -v '^[[:space:]]*#'; then
        echo "[ERROR] $FILE contains byebug!"
        exit 1
    fi

    # Check if the file contains 'binding.pry'
    if grep "binding.pry" "$FILE" | grep -q -v '^[[:space:]]*#'; then
        echo "[ERROR] $FILE contains binding.pry!"
        exit 1
    fi

    # Check if the file contains 'debugger'
    if grep "debugger" "$FILE" | grep -q -v '^[[:space:]]*#'; then
        echo "[ERROR] $FILE contains debugger!"
        exit 1
    fi

  fi # [end] .rb


  if [[ $FILE =~ .(js|ts|vue).*$ ]] &&  [[ ! $FILE =~ vendor/assets/javascripts ]] && [[ ! $FILE =~ node_modules ]]; then
    # Check if the file contains 'console.log'
    if grep "console.log" "$FILE" | grep -q -v '^[[:space:]]*//'; then
      echo "[ERROR] $FILE contains console.log()!"
      exit 1
    fi

    if grep "alert(" "$FILE" | grep -q -v '^[[:space:]]*//'; then
      echo "[ERROR] $FILE contains alert()!"
      exit 1
    fi

    if grep "debugger" "$FILE" | grep -q -v '^[[:space:]]*//'; then
      echo "[ERROR] $FILE contains debugger!"
      exit 1
    fi

    # Check if the file contains query debugging
    if grep ".debug(" "$FILE" | grep -q -v '^[[:space:]]*//'; then
      echo "[ERROR] $FILE contains debug()!"
      exit 1
    fi

    # pry-js
    if grep "pry.it" "$FILE" | grep -q -v '^[[:space:]]*//'; then
      echo "[ERROR] $FILE contains pry!"
      exit 1
    fi

  fi # [end] .(ts|js|vue)


  # if [[ $FILE =~ .spec.js$ ]]; then
   if [[ $FILE =~ (spec|test).(js|ts)$ ]]; then
    if grep -q ".only(" "$FILE" | grep -q -v '^[[:space:]]*//'; then
      echo "[ERROR] $FILE contains only() filtering specs!"
      exit 1
    fi
  fi


  if [[ $FILE =~ structure.sql ]]; then
    # Check for trailing whitespaces in structure.sql
    if grep -q '[[:blank:]]$' "$FILE"; then
      echo "[ERROR] $FILE contains trailing whitespaces!"
      exit 1
    fi
  fi

done