Print often changed files and dirs.

most-changed-dirs

#!/usr/bin/env ruby

# pipe the following command into this script:
# git log --pretty=format: --name-only | most-changed-dirs

counts = Hash.new { |hash, k| hash[k] = 0 }

while (filename = gets)
  next if filename.start_with?('@')
  parts = filename.strip.split(File::SEPARATOR).reject(&:empty?)
  2.upto(parts.size) do |i|
    counts[parts.take(i+1).join(File::SEPARATOR)] += 1
  end
end

counts.sort_by { |k, v| -v }.take(100).each do |filename, count|
  puts "  #{count}\t\t#{filename}"
end