nixpkgs/pkgs/build-support/emacs/melpa2nix.el

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(require 'package)
(package-initialize)
(require 'package-build)
(setq package-build-working-dir (expand-file-name ".")
package-build-archive-dir (expand-file-name "."))
(defun melpa2nix-build-package ()
(if (not noninteractive)
(error "`melpa2nix-build-package' is to be used only with -batch"))
(pcase command-line-args-left
(`(,package ,version . ,files)
(melpa2nix-package-build-archive package version files))))
(defun melpa2nix-build-package-from-recipe ()
(if (not noninteractive)
(error "`melpa2nix-build-package' is to be used only with -batch"))
(pcase command-line-args-left
(`(,recipe-file ,version)
(let* ((recipe (package-build--read-from-file recipe-file))
(rcp (cdr recipe))
(package (car recipe))
(files (package-build--config-file-list rcp)))
(melpa2nix-package-build-archive package version files)))))
(defun melpa2nix-package-build-archive (name version files)
"Build a package archive for package NAME."
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(package-build--message "\n;;; %s\n" name)
(let* ((start-time (current-time))
(archive-entry (package-build-package name
version
files
package-build-working-dir
package-build-archive-dir))
(archive-file (package-build--archive-file-name archive-entry)))
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(progn
(package-build--message "Built in %.3fs, finished at %s"
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(time-to-seconds (time-since start-time))
(current-time-string))
(princ (format "%s\n" archive-file)))))