Monitors changed files and will tell you as soon as a test doesn't pass anymore

rspec-mon.rb

#!/usr/bin/env ruby

# THIS IS A WORK IN PROGRESS TOOL

def get_changed_files
	files = `git diff --name-only |grep .rb`.split("\n").map do |f| 
		f2 = f.split('/') ; f2.shift ; f2.join('/')
	end
	files_new = []
	files.each do |f|
		f_test = f.gsub(/\.rb$/,"_spec.rb").gsub(/^app\//,"spec\/")
		files_new << f_test if File.exists?(f_test)
		f_base = File.basename(f).split('.').first
		files_new += Dir.glob("spec/**/**/#{f_base}_spec.rb")
	end
	files + files_new
end

@result_db = {}

def run_rspec(f)
	result = `spring rspec #{f} 2>&1`
	@result_db[f] ||= {mtime: 0, ok: false}
	@result_db[f][:mtime] = File.mtime(f)
	if result.nil?
		@result_db[f][:ok] = true
		""
	else
		result = result.gsub(/Running.*$/,"")
		if result.include?("0 failures")
			if @result_db[f][:ok] == false
				`terminal-notifier -title '🟩 A test now passes again (rspec-mon)'`
			end
			@result_db[f][:ok] = true
		else
			`echo An RSPEC test failed.|terminal-notifier -title '🟥 A test fails (rspec-mon)' -open file:///tmp/rspec-mon-lastfail.txt`
			result = result.gsub(/failures/,"FAILURES".bold.red)
			File.open("/tmp/rspec-mon-lastfail.txt",'w') {|file| file.write(result) }
			@result_db[f][:ok] = false
		end
		result = result.gsub(/0 failures$/,"GREEN".bold.green)
		"#{f}: #{result.strip}"
	end 
end

def rspec_files(files)
	files = files.select do |f|
		@result_db[f].nil? || @result_db[f][:mtime] != File.mtime(f)
	end

	files.each do |f|
	  STDERR << run_rspec(f)
	end
end

class String
def bold; 			"\e[1m#{self}" end
def black;          "\033[30m#{self}\033[0m" end
def red;            "\033[31m#{self}\033[0m" end
def green;          "\033[32m#{self}\033[0m" end
def brown;          "\033[33m#{self}\033[0m" end
def blue;           "\033[34m#{self}\033[0m" end
def magenta;        "\033[35m#{self}\033[0m" end
def cyan;           "\033[36m#{self}\033[0m" end
def gray;           "\033[37m#{self}\033[0m" end
end

def color(index, str, bold: false)
  if bold
    "\e[#{index}m\e[1m#{str}\e[0m"
  else
  	"\e[#{index}m#{str}\e[0m"
  end
end

t0, new_mtime, changed_files_old, last_time = [Time.now, File.mtime(__FILE__), nil, 0]

while true
	changed_files = get_changed_files unless last_time == Time.now.to_i
	if changed_files_old != changed_files
		changed_files_old = changed_files
	end
	last_time = Time.now.to_i
	rspec_files(changed_files)
	sleep(0.1)
	exit if new_mtime != File.mtime(__FILE__)
	new_mtime = File.mtime(__FILE__)
end