A simple tool to run rubocop on files you have changed

install

echo "Creating $(git rev-parse --git-dir)/hooks/pre-commit.d"
mkdir $(git rev-parse --git-dir)/hooks/pre-commit.d
echo "Downloading rubocop hook into $(git rev-parse --git-dir)/hooks/pre-commit.d/rubocop"
wget -O $(git rev-parse --git-dir)/hooks/pre-commit.d/rubocop https://gist.githubusercontent.com/brand-it/93d04c839238283e3e756811b9c9cee0/raw/616bf812b58bcefc52d564ed8abacbf30966193c/pre-commit.d_rubocop
echo "Changing rubocop into a executable $(git rev-parse --git-dir)/hooks/pre-commit.d/rubocop"
chmod 755 $(git rev-parse --git-dir)/hooks/pre-commit.d/rubocop
echo "adding hooks_directory variable to $(git rev-parse --git-dir)/hooks/pre-commit if it does not already exist"
grep -qxF 'hooks_directory=$(git rev-parse --git-dir)/hooks/pre-commit.d' $(git rev-parse --git-dir)/hooks/pre-commit || echo 'hooks_directory=$(git rev-parse --git-dir)/hooks/pre-commit.d' >> $(git rev-parse --git-dir)/hooks/pre-commit
echo "adding $hooks_directory/rubocop variable to $(git rev-parse --git-dir)/hooks/pre-commit if it does not already exist"
grep -qxF '$hooks_directory/rubocop' $(git rev-parse --git-dir)/hooks/pre-commit || echo '$hooks_directory/rubocop' >> $(git rev-parse --git-dir)/hooks/pre-commit

pre-commit.d_rubocop

#!/usr/bin/env ruby
# frozen_string_literal: true
require 'json'

def files
  @files ||= begin
    `git diff --staged --name-only --cached`.split("\n").reject do |file|
      !File.exists?(file)
    end
  end
end

def rubocop
  @rubocop ||= JSON.parse(
    `bundle exec rubocop --parallel --force-exclusion --format json #{files.join(' ')}`,
    symbolize_names: true
  )
end

def violations
  rubocop[:files].select { |x| x[:offenses].any? }
end

def format_violations
  violations.each do |violation|
    violation[:offenses].each do |offense|
      puts "#{violation[:path]}:#{offense.dig(:location, :line)}:#{offense.dig(:location, :column)} #{offense[:cop_name]} #{offense[:message]}\n"
    end
  end

  puts "\n\n#{rubocop.dig(:summary, :inspected_file_count)} file inspected, #{rubocop.dig(:summary, :offense_count)} offense detected"
end

def success(message)
  puts message
  exit 0
end

def rubocop_autocorrect
  system("bundle exec rubocop -A #{violations.map { |v| v[:path] }.join(' ')}")
end

def waiting
  index = 0
  chars = %w[| / - \\]
  while @rubocop.nil?
    print "rubocop analyzing ... #{chars[(index += 1) % chars.length]}\r"
    sleep(1)
  end
  puts 'rubocop analyzing ... done'
end

success('no file to check') if files.size.zero?

[].tap do |threads|
  threads << Thread.new { rubocop }
  threads << Thread.new { waiting }
  threads.map(&:join)
end

exit true if violations.empty?

format_violations

# Open input from keyboard usin IO.new(0) normal standard in is closed
fd = IO.sysopen '/dev/tty', 'r'
ios = IO.new(fd, 'r')

print 'Do you want to fix and exit?(Y) '
if ios.gets.chomp == 'Y'
  rubocop_autocorrect
  exit 1
end

print 'Do you want to commit anyway?(Y) '
exit ios.gets.chomp == 'Y'

curl https://gist.githubusercontent.com/brand-it/93d04c839238283e3e756811b9c9cee0/raw/0b5124535880c21536c0c8d936b3ee723d1d196a/install | bash

To add this rubocop to your current repo git directory, run the above command in the terminal.

Every time you do a git commit -m 'something', it will run rubocop against the files you have changed

To ignore hooks altogether just add --no-verify