require 'fastercsv'

h = Hash.new
linen = 0
dategroup = Date.new
#.select{ |l| l =~ /[a-zA-Z0-9]+/ }
`git log --pretty=format:%aD --shortstat | grep [a-zA-Z0-9]`.each { |line|
        if line =~ /\d\d:\d\d:\d\d/ then
                date = Date.parse(line)
                dategroup = Date.new(date.year, date.month, 1)
                if h[dategroup] then
                        h[dategroup][:commits] += 1
                else
                        h[dategroup] = Hash.new
                        h[dategroup][:commits] = 1
                end
        else
                line =~ /([\d]+) files changed, ([\d]+) insertions\(\+\), ([\d]+) deletions\(-\)/
                h[dategroup][:insert] = (h[dategroup][:insert])? h[dategroup][:insert].to_i + $2.to_i : $2.to_i
                h[dategroup][:delete] = (h[dategroup][:delete])? h[dategroup][:delete].to_i + $3.to_i : $3.to_i
        end
}

FasterCSV.open("/tmp/count.csv", "w") do |csv|
        h.sort.each { |date, value|
                csv << [ "#{date.month}/1/#{date.year}", value[:commits], value[:insert] + value[:delete] ]
        }
end