Git Stats that developers committed between two dates

gitstats.rb

#!/usr/bin/env ruby

# Super lame because I'm not even using optparse. Killme. 
# gitstats.rb from-date to-date
# Will find the commit stats for all developers on a project within those dates.
# Example:
# gitstats.rb 2019-03-22 2019-04-01 
# gets all stats betwee the above dates exclusive.

from = ARGV.shift
to = ARGV.shift
from ||= (Time.now - (7 * 24 * 3600)).strftime('%Y-%m-%d')
to ||= Time.now.strftime('%Y-%m-%d')
authors = `git shortlog -se --all --since #{from} --before #{to} | awk '{print $(NF)}'`.split("\n").sort.uniq

puts "Git Stats from #{from} to #{to}\n\n"
authors.each do |name|
  name = name.delete('<').delete('>')
  puts name
  puts '  ' + `git log --shortstat --all --no-merges --author "#{name}" --since #{from} --before #{to} | grep "files changed" | awk '{files+=$1; inserted+=$4; deleted+=$6} END {print "files changed", files, "lines inserted:", inserted, "lines deleted:", deleted}'`
end
puts 'Total'
  puts '  ' + `git log --shortstat --all --no-merges --since #{from} --before #{to} | grep "files changed" | awk '{files+=$1; inserted+=$4; deleted+=$6} END {print "files changed", files, "lines inserted:", inserted, "lines deleted:", deleted}'`