Counts files, lines, words in a folder (by file extension) and then gives you a pure typing time analysis

fileMetrics.rb

require 'find'

if ARGV.length != 2
  raise ArgumentError.new('Two arguments are required: path, extension')
end

path = ARGV[0]
extension = ARGV[1]

numFiles = 0

lines = 0
words = 0
chars = 0
results = []

Find.find(path) do |f|
  if File.file?(f) && File.fnmatch('*.' + extension, f)
    File.new(f, "r").each { |line| results << line }

    puts "#{f} has"
    lines += results.size

    results.each do |line|
     chars += line.length
     words += line.split.length
   end
   
   results = []
   numFiles += 1
  end
end

puts ".#{extension} - #{numFiles} files / #{lines} lines of code / #{words} words of code"

minutes = words/80
hours = minutes/60
days = hours/8

puts "Typing this project should have taken #{minutes} minutes, which is #{hours} hours or #{days} days."

Run this in your command line like

ruby pathToThisScript/fileMetrics.rb pathToSrcFolder as