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(require 'package)
(defun elpa2nix-install-package ()
(if (not noninteractive)
(error "`elpa2nix-install-package' is to be used only with -batch"))
(pcase command-line-args-left
(`(,archive ,elpa)
(progn (setq package-user-dir elpa)
(elpa2nix-install-file archive)))))
(defun elpa2nix-install-from-buffer ()
"Install a package from the current buffer."
(let ((pkg-desc (if (derived-mode-p 'tar-mode)
;; Install the package itself.
(package-unpack pkg-desc)
(defun elpa2nix-install-file (file)
"Install a package from a file.
The file can either be a tar file or an Emacs Lisp file."
(let ((is-tar (string-match "\\.tar\\'" file)))
(if is-tar
(insert-file-contents-literally file)
(insert-file-contents file))
(when is-tar (tar-mode))