flog-commit-by-commit

#!/usr/bin/env ruby

project_source_dir  = ARGV.first
project_source_dir += '/' unless project_source_dir[-1] == '/'

raise 'Not a Git repository' unless File.exists? "#{project_source_dir}.git"

# TODO: raise 'Not a Rails application' if ???

def pending_git_tasks?
  result = `git status`

  result.include?('Untracked files:') ||
    result.include?('unmerged:') ||
    result.include?('modified:')
end

original_dir = Dir.pwd

Dir.chdir project_source_dir

require 'progressbar'

begin
  raise 'Commit or stash before start' if  pending_git_tasks?

  `find #{project_source_dir} -name \*~ -delete`

  revs = `git log --oneline --reverse --no-color |cut -d' ' -f1`.split

  project_name = File.basename project_source_dir
  File.open(File.join(original_dir, "#{project_name}-flog"), 'w') do |file|
    file.sync = true

    pbar = ProgressBar.new('Revisions', revs.size)
    revs.each do |revision|
      `git checkout -q #{revision}`
      flogs = `flog --continue -s app lib test spec`

      # file.puts "#{revision} #{flogs.split("\n").join}"
      # file.puts "#{revision} #{flogs.split.first[0..-2]}"

      file.puts flogs.split.first[0..-2]

      pbar.inc
    end
    pbar.finish
  end
ensure
  `git checkout master`
  Dir.chdir original_dir
end