Find symlinks replaced by directories and the reverse in git

find_symlink_dir_git.rb

#!/usr/bin/env ruby
  
  git_log = %x{git log --name-status --diff-filter=AD}.lines.select{ |x| 
    x =~ /\s*(A|D)\s+/
  }.map(&:strip)
  
  deleted = []
  added = []
  
  git_log.each do |logline|
    k,v = logline.split(/\s+/)
  
    if k == 'D' 
      deleted << v
    else
      added << v
    end 
  end
  
  replaced_symlink_with_dir = {}
  replaced_dir_with_symlink = {}
  
  def replaced_with_dir(to_find, added)
    added.grep(%r{^#{to_find}/.+})
  end
  
  def replaced_with_symlink(to_find, added)
    added.grep(%r{^#{to_find}$})
  end
  
  deleted.each do |file|
    matching_files = replaced_with_dir(file, added)
  
    unless matching_files.empty?
      replaced_symlink_with_dir[file] ||= []
      replaced_symlink_with_dir[file] += matching_files
      next
    end 
  
    matching_files = replaced_with_symlink(File.dirname(file), added)
  
    unless matching_files.empty?
      replaced_dir_with_symlink[path] ||= []
      replaced_dir_with_symlink[path] += matching_files
      break
    end 
  end
  
  require 'json'

  puts 'Symlinks replaced with directories:'
  puts JSON.pretty_generate(replaced_symlink_with_dir)
  
  puts ''
  puts 'Directories replaced with symlinks:'
  puts JSON.pretty_generate(replaced_dir_with_symlink)