Print or copy all git commit messages from a single day.

git_messages_in_a_day.rb

#!/usr/bin/env ruby

require 'optparse'
require 'date'

options = {
  branch: '',
  day: Date.today.day,
  month: Date.today.month,
  year: Date.today.year,
  author: `git config --global user.email`,
  silent: false
}

OptionParser.new do |opts|
  opts.banner = "Usage: \n\`command [options]`"
  opts.separator ''
  opts.separator 'Options:'

  opts.on('-b', '--branch BRANCH', 'Branch name. Defaults to the current branch') { |v|
    options[:branch] = v
  }
  opts.on('-d', '--day DAY', 'Day number. Defaults to today') { |v|
    options[:day] = v
  }
  opts.on('-m', '--month MONTH', 'Month number. Defaults to today') { |v|
    options[:month] = v
  }
  opts.on('-y', '--year YEAR', 'Year number. Defaults to today') { |v|
    options[:year] = v
  }
  opts.on('-a', '--authour AUTHOR', 'Author name. Uses the global user as default') { |v|
    options[:author] = v 
  }
  opts.on('-s', '--silent', 'Don\'t print to the console. Defaults to false') {
    options[:silent] = true
  }

  opts.separator ''
  opts.separator 'By default the script will try to copy the log to clipboard using either pbcopy or xclip (if available)'
end.parse!

def which(cmd)
  exts = ENV['PATHEXT'] ? ENV['PATHEXT'].split(';') : ['']
  ENV['PATH'].split(File::PATH_SEPARATOR).each do |path|
    exts.each { |ext|
      exe = File.join(path, "#{cmd}#{ext}")
      return exe if File.executable?(exe) && !File.directory?(exe)
    }
  end
  return nil
end

date = "#{options[:year]}-#{options[:month]}-#{options[:day]}"
get_git_messages_command = "git log #{options[:branch]} --after='#{date} 00:00' --before='#{date} 23:59' --author=#{options[:author].chomp} --pretty=format:'%s' | cat"
git_messages = `#{get_git_messages_command}`

if which('pbcopy')
  `echo '#{git_messages}' | pbcopy`
elsif which('xclip')
  `echo '#{git_messages}' | xclip`
end

puts git_messages unless options[:silent]

1. Download or paste the file into /usr/bin

sudo cp ~/Downloads/git_messages_in_a_day.rb /usr/bin/daymessages

2. Make the file executable

sudo chmod u+x /usr/bin/daymessages

3. Profit!

daymessages -h

( no Windows love :( )