Git pre-commit hook for prompting to remove binding.pry and debugger lines lines. (Includes a commented example of adding a check for focus in spec files.)

pre-commit

#!/usr/bin/env ruby

hits = []

checks = {
            '_spec\.rb$' => ['focus: *true', 'focus *=> *true'],
            '\.rb$' => ['binding\.pry', 'debugger']
         }

# Find the names of all the filenames that have been (A)dded (C)opied or (M)odified
filenames = `git diff --cached --name-only --diff-filter=ACM`.split("\n")

filenames.each do |filename|
  # Perform special checks for _spec filenames (rspec tests)
  checks.each do |filename_pattern, patterns|
    if filename.match filename_pattern
      patterns.each do |contents_pattern|
        results = `git diff --cached  #{filename} | grep "^\+[^+]" | grep "#{contents_pattern}"`.split("\n").map { |r| r.sub(/^\+[\s]*/, '') }
        if $? == 0
          puts "results: #{results}"
          
          # Add the relevant change with line number to the hits array
          results.each do |r|
            count = 0
            File.open(filename).readlines.each do |line| 
              line.chomp!
              count += 1 
              if line =~ /#{r}/
                hits.push "#{filename}: #{count}: #{line}"
              end
            end
          end
        end
      end
    end
  end
end

if hits.any?
  puts "\e[33m>>> Please remove the following problems from these files before committing\e[0m"
  puts hits.join("\n")
end

exit 1 if hits.any?