Add a histogram when you cd into any git repos showing your commits across all branches over the past half-year. Requires Zach Holman's `spark` script (`brew install spark`): https://github.com/holman/spark latest version: updated spark-action.rb to take in a directory name. todo: put ruby script in git, change weeks to an optional fileopts flag…

cd_with_git_histogram.sh

cd() {
  if [[ $@ == '-' ]]; then
    builtin cd "$@" > /dev/null  # We'll handle pwd.
  else
    builtin cd "$@"
  fi
  # you could use git rev-parse below instead but it'll trigger in all directories in the repo
  if ls .git &> /dev/null; then
      echo -e "   \033[1;34m"`~/bin/spark-action.rb . 26`"\033[0m"
  fi
}

spark-action.rb

#!/usr/bin/env ruby

class Time
  def week
    strftime('%U').to_i
  end
end

WEEK_SECONDS = 7 * 24 * 60 * 60

def time_between?(t, min, max)
  (t.year == min.year && t.week >= min.week) || (t.year == max.year && t.week <= max.week)
end

def git_hist(dir, ago_secs)
  now = Time.now
  min = now - ago_secs
  `git --git-dir=#{dir}/.git --work-tree=#{dir} log --branches=* --author='#{ENV['USER']}' --since="#{ago_secs/WEEK_SECONDS} weeks ago" --pretty=format:'%at'`.map {|line|
    t = Time.at(line.split(' ').last.to_i)
    time_between?(t, min, now) ? t : nil
  }.compact.group_by {|x| x.strftime('%G%U') }.inject({}) {|res, (k, v)|
    res[k] = v.size
    res
  }
end

def spark_vals(weeks, commits, min)
  (0...weeks).map {|i|
    commits[(min + WEEK_SECONDS * i).strftime('%G%U')] || 0
  }.join(',')
end

def stats_since(dir, ago)
  ago_secs = ago * 60 * 60 * 24 * 7
  spark_vals(ago, git_hist(dir, ago_secs), Time.now - ago_secs)
end

print `spark #{stats_since(ARGV[0], ARGV[1].to_i)}`