The number of commits in a repo (or subfolder). Uses `brew install git-extras`

commithistory.rb

#!/usr/bin/env ruby

initial_months_ago = ARGV.shift || 12
puts "Showing last #{initial_months_ago} months of commits per directory"
subfolders=Dir['*'].select { |dir| File.directory?(dir) }

def summary(dir, months_ago)
  filter = "--since #{months_ago}.months --until #{months_ago - 1}.months"
  `git summary #{filter} #{dir} | grep '^   ' | awk '{total = total + $1}END{print total}'`.strip
end

subfolders.each do |dir|
  commit_counts = []
  print "%23s" % dir
  1.upto(initial_months_ago.to_i) do |months_ago|
    print "\t#{summary dir, months_ago}"
  end
  puts ""
end

totalcommits.sh

git summary --since=6.months . | grep "^   " | awk '{total = total + $1}END{print total}'

totalcommits_in_subfolders.sh

filter=$1 # e.g. '--since=6.months'
subfolders=$(ls -l | egrep '^d' | awk '{print $9}')
for dir in $subfolders
do
  commitcount=$(git summary $filter $dir | grep "^   " | awk '{total = total + $1}END{print total}')
  echo $dir $commitcount
done