Git pre-commit hook to check syntax of ruby files

#!/usr/bin/env ruby

@paths_to_verify = ['./app', './lib']

def check_dir_syntax(dir)
  dir.each do |f|
    next if f =='.' || f == '..'
    path = File.join(dir.path, f)
    
    if File.directory?(path)
      check_dir_syntax(Dir.new(path))
    elsif path.split('.')[-1] == 'rake' || path.split('.')[-1] == 'rb'
      file = File.new(path)
      check_file_syntax(file)
      file.close
    end
  end
end

def check_file_syntax(file)
  @files_counter += 1
  @bad_files << file.path unless (`ruby -c #{file.path}`).strip == 'Syntax OK'
end

def check_syntax
  @start_time      = Time.now
  @bad_files       = []
  @files_counter   = 0

  @paths_to_verify.each do |path|
    check_dir_syntax Dir.new(path)
  end

  puts "Checked #{@files_counter} files in #{Time.now - @start_time} seconds."
  exit 1 unless @bad_files.empty?
end

check_syntax()