gbrt

#!/usr/bin/env ruby

def format_commit_info(timestamp, time_desc, commit_id, message, ref_name, upstream)
  [
    "#{timestamp.strftime("%y %b %d")}, #{timestamp.strftime("%l:%M%p").downcase}",
    "(#{time_desc})",
    commit_id,
    message,
    ref_name,
    upstream || ''
  ]
end

def render_commit_info(timestamp, time_desc, commit_id, message, ref_name, upstream, merged)
  [
    timestamp,
    time_desc,
    colorize(upstream, :purple),
    colorize(ref_name, :green),
    colorize(commit_id, merged ? :gray : :cyan),
    colorize(message.strip, message[/^Temp/] ? :red : :gray)
  ].join(' ')
end

ANSI_COLORS = {
  :black => 30,
  :blue => 34,
  :cyan => 36,
  :gray => 90,
  :green => 32,
  :purple => 35,
  :red => 31,
  :white => 37,
  :yellow => 33
}

def colorize(message, color=nil)
  if color
    "\e[#{ANSI_COLORS[color]}m#{message}\e[0m"
  else
    message
  end
end

upstreams = Hash[`git for-each-ref --format='%(refname:short) <- %(upstream:short)' refs/heads`.strip.split("\n").collect{|e| e.split(" <- ")}.collect{|a| [a[0], a[1] ? a[1].split('/')[0] : '']}]

commit_info = `git branch #{ARGV.join(' ')} | cut -c 3-`.strip.split("\n").reject {|ref_name|
  ref_name[' -> ']
}.map {|ref_name|
  `git log --no-walk --pretty=format:"%ct\n%cr\n%h\n%s" '#{ref_name}' --`.strip.split("\n").push(ref_name).push(upstreams[ref_name])
}.map {|commit_info|
  [Time.at(commit_info.shift.to_i)].concat(commit_info)
}.sort_by {|commit_info|
  commit_info.first # unix timestamp
}.reverse.map {|commit_info|
  format_commit_info(*commit_info)
}.transpose.map {|column|
  max_col_length = column.sort_by {|i| i.length }.last.length
  column.map {|i| i.ljust(max_col_length) }
}.transpose.map {|commit_info|
  commit_info.push(
    `git merge-base HEAD #{commit_info[2]}`.chomp[0...7] == commit_info[2]
  )
}.each {|commit_info|
  puts render_commit_info(*commit_info)
}