My FED Pre-Commit Hook

gistfile1.rb

#!/usr/bin/env ruby

errors = false

# Create a simple line break
puts ""

# Now let's get a list of the changed files that have been staged
changed_files = `git diff --staged --name-only HEAD`.split("\n")

# A list of validators, and their associated behaviors
validators = {
  :js => { 
    :label => "javascript",
    :app => "jshint",
    :supported => !`type jshint`.include?("not found"),
    :output => Proc.new { |file| `jshint #{file}` },
    :valid => Proc.new { |file| output.empty? }
  },
  :css => { 
    :label => "css",
    :app => "csslint",
    :supported => !`type csslint`.include?("not found"),
    :output => Proc.new { |file| `csslint #{file}`.strip},
    :valid => Proc.new { |output| output == "csslint: No errors in #{file}." }
  },
  :erb => { 
    :label => "erb",
    :app => "rails-erb-check",
    :supported => !`type rails-erb-check`.include?("not found"),
    :output => Proc.new { |file| `rails-erb-check #{file}`.strip },
    :valid => Proc.new { |output| output.include?("valid") }
  },
  :scss => {
    :label => "scss",
    :app => "sass",
    :supported => !`type sass`.include?("not found"),
    :output => Proc.new { |file| `sass --check #{file} 2>&1` },
    :valid => Proc.new { |output| output.include?("Invalid CSS") == false }
  }
}

# For each file, if we have a validator for it, run it
changed_files.each do |file|
  
  type = validators[file.split(".").last.to_sym]
  
  next if type.nil?

  print "Validating #{file}... "
  
  # Notify the user if they need to install a validator
  if not type[:supported]
    puts "\033[31mPlease install #{type[:app]} for #{type[:label]} validation support.\033[0m"
    next
  end

  output = type[:output].call(file)
  valid = type[:valid].call(output)

  if not valid
    errors = true
    puts "\033[31merrors in #{type[:label]}.\033[0m" + "\n" + output
  else
    puts "\033[32m#{type[:label]} is valid\033[0m"
  end

end

# Conclusion:
if errors
  puts "\n\033[31mErrors found in front-end code, preventing commit :(\033[0m"
  exit!
else
  puts "\033[32m\nFrontend code appears to be clean :)\n\033[0m"
end