Check git status before doing something and auto-tag

auto_git.rb

def ask
  print "Do you want to continue? (y/N) "
  answer = STDIN.gets.strip.downcase
  if answer != "y" 
    return false
  end
  return true
end

def get_branch
  begin
    return `git rev-parse --abbrev-ref HEAD`.strip
  rescue
    return nil
  end
end

def get_status
  begin
    return `git status -s`.strip
  rescue
    return nil
  end
end

def check_git( branch_name )
  begin
    branch = get_branch
    if !branch
      puts "Warning: git not found. Version checking disabled."
      return true
    elsif branch != branch_name
      puts "Branch is not `#{branch_name}`, but `#{branch}`."
      ask or return false
    end

    status = get_status
    if status.length > 0
      puts "There are uncommitted changes:"
      system("git status -s")
      ask or return false
    end
  rescue
    
  end
  return true
end

def create_tag( prefix )
  status = get_status

  if !status
    puts "Warning: Cannot get git status, no tag will be created."
  elsif status.length == 0
    d = DateTime.now.strftime("%Y%m%d")
    tag = "#{prefix}-#{d}"
    puts "Adding git tag #{tag}..."
    `git tag -f #{tag}`    
  else
    puts "Uncommitted changes, no tag will be created."
  end
end