A Git pre-commit hook for Ruby projects that validates syntax, looks for any lingering puts or byebug statements.

ruby-pre-commit

#!/bin/sh
#
# A pre-commit hook for Ruby projects.
#
# == Installation
#
# From within a Ruby project directory in your terminal:
#
#   curl https://gist.github.com/scottserok/0838cdda3f07a6eb30b44ee475b1e57c/raw/fe00beb4a69c529c6391def23a4dc61e2711c2cb/ruby-pre-commit >> .git/hooks/pre-commit && chmod +x .git/hooks/pre-commit

# Redirect output to stderr.
exec 1>&2

# check the syntax for any changed ruby files
paths=$(git diff --cached --name-only | grep '.rb$')
for path in $paths; do
  if test -f $path && ! ruby -c $path
  then
    cat <<\EOF

Error: Attempt to commit a Ruby file that does not pass syntax validation:
EOF
    echo $path
    exit 1
  fi
done

# check for byebug statements
if test $(git grep -l ' byebug ' spec lib config | wc -c) != 0
then
	cat <<\EOF

Error: Attempted to commit with a byebug statement

EOF
echo $(git grep -l ' byebug ' spec lib config)
	exit 1
fi

# check for puts statements
if test $(git grep -l ' puts ' spec/lib spec/graphql lib config | grep -v lib/tasks | wc -c) != 0
then
	cat <<\EOF

Error: Attempted to commit with a "puts" statement

EOF
echo $(git grep -l ' puts ' spec/lib spec/graphql lib config)
	exit 1
fi