heroku-compare

#!/usr/bin/env ruby

remote, *_ = ARGV
remote ||= 'heroku'

branches = `git branch --remote --list origin*`.lines.map(&:strip)

result = branches.each_with_object({}) do |branch, h|
  h[branch] = {
    :ahead  => `git log --oneline #{remote}/master..#{branch}`.lines.length,
    :behind => `git log --oneline #{branch}..#{remote}/master`.lines.length
  }
end

rows = [['Branch', 'Ahead', 'Behind']]

result.each do |branch, state|
  rows << [branch, state[:ahead].to_s, state[:behind].to_s]
end

widths = (0..2).map { |i| rows.map { |row| row[i].length }.max }

rows.each do |row|
  row.each_with_index { |value, index| print value.ljust(widths[index] + 2) }
  print "\n"
end