code: def branches(config, searchstring=""):
      
      repo = config.repo
  
      branches_ = list(find(repo, searchstring))
      if branches_:
          merged = get_merged_branches(repo)
          info_out("Found existing branches...")
          print_list(branches_, merged)
          if len(branches_) == 1 and searchstring:
              # If the found branch is the current one, error
              active_branch = repo.active_branch
              if active_branch == branches_[0]:
                  error_out("You're already on '{}'".format(branches_[0].name))
              branch_name = branches_[0].name
              if len(branch_name) > 50:
                  branch_name = branch_name[:47] + "…"
              check_it_out = (
                  input("Check out '{}'? [Y/n] ".format(branch_name)).lower().strip()
                  != "n"
              )
              if check_it_out:
                  branches_[0].checkout()
      elif searchstring:
          error_out("Found no branches matching '{}'.".format(searchstring))
      else:
          error_out("Found no branches.")
docs: List all branches. And if exactly 1 found, offer to check it out.