Pre-Commit Hook for Git

pre-commit

#!/usr/bin/ruby

# https://www.ruby-forum.com/topic/122170#544763

git_files = `git diff --cached --name-only`.lines.map(&:chomp)

offending_lines = {}

def File.binary? name
  open name do |f|
    while (b=f.read(256)) do
      return true if b[ "\0"]
    end
  end
  false
end

git_files.each do |file|

  next unless File.file?(file)
  next if File.binary?(file)

  File.open(file) do |f|
    ln = 1
    lna = Array.new

    f.each_line do |line|

      lna.push ln  if line.match /\t/

      offending_lines[file] = lna unless lna.empty?

      ln += 1
    end
  f.close
  end
end

eof_new_line = []

skip_newline = ['.css', '.min.js', '.map']

git_files.each do |file|

  skip = false
  skip_newline.each do |ext|
    if File.basename(file) =~ /#{ext}$/
      skip = true
    end
  end
  next if skip == true

  next unless File.file?(file)
  next if File.binary?(file)
  eof_new_line.push file unless IO.readlines(file).last.match /[^\n]\n$/
end

unless offending_lines.empty?

  puts "\n"
  puts "   Pre-Commit Hook Failure (.git/hooks/pre-commit)"
  puts "   Tab characters are illegal in source control and Tabs were found in the following files"
  puts "\n\n"

  offending_lines.each do |file, line_numbers|
    puts "   #{file}"
    line_numbers.each_slice(15).to_a.each { |sub_array| puts "\t" + sub_array.join(', ') }
    puts "\n"
  end
exit 1
end

unless eof_new_line.empty?

  puts "\n"
  puts "   Pre-Commit Hook Failure (.git/hooks/pre-commit)"
  puts "   A single newline character (\\n) must be the last character for the following files:"
  puts "\n\n"

  eof_new_line.each do |file|
    puts "   #{file}"
    puts "\n"
  end
exit 1
end