その日のコミットログの最初と最後を表示する

commit_log_ts.rb

#!/bin/env ruby

require 'time'
require 'pp'

AUTHOR = "joker1007"
COMMAND = "/usr/bin/git log --author=#{AUTHOR} --all --pretty='%ci'"

timestamps = `#{COMMAND}`.each_line.map do |l| 
  Time.parse(l.chomp)
end

pp timestamps.group_by {|t|
  t.strftime("%Y/%m/%d")
}.each_with_object({}) {|kv, h|
  h[kv[0]] = kv[1].minmax
}