#! /usr/bin/ruby -w

require 'date'
require 'find'

# TODO
# - make work with -p option

def main
  logopts = "--color=always --since=#{Date.today - 3} #{ARGV.join(' ')}"
  puts merged_commits('.', logopts: logopts).join("\n")
end

def usage
  # TODO
end

def repositories(path)
  Enumerator.new do |yielder|
    Find.find(path) do |f|
      if File.basename(f) == '.git'
        yielder.yield File.dirname(f)
        Find.prune
      end
    end
  end
end

def commits(repo, options = {})
  Dir.chdir(repo) do
    `git log -z --stat #{options[:logopts]}`.split("\0").tap do
      st = $?.exitstatus
      raise "git error: #{st}" unless st == 0
    end
  end
end

def commits_by_date(repo, options = {})
  Hash.new { |h, d| h[d] = [] }.tap do |by_date|
    commits(repo, options).each do |commit|
      date = DateTime.parse(commit[/^Date:\s*(.+)$/, 1])
      by_date[date] << commit
    end
  end
end

def insert_prefix(enum, prefix)
  enum.map { |e| prefix + e }
end

def merged_commits(path, options = {})
  merged = Hash.new { |h, d| h[d] = [] }

  repositories(path).each do |repo|
    banner = "\e[01;34mRepository: #{repo}\e[0m\n"

    commits_by_date(repo, options).each do |date, commits|
      merged[date] += insert_prefix(commits, banner)
    end
  end

  merged.sort_by(&:first).map(&:last).reverse
end


main