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

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EmacsLisp
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(require 'package)
(package-initialize)
(require 'package-recipe)
(require 'package-build)
(setq package-build-working-dir (expand-file-name "working/"))
(setq package-build-archive-dir (expand-file-name "packages/"))
(setq package-build-recipes-dir (expand-file-name "recipes/"))
;; Allow installing package tarfiles larger than 10MB
(setq large-file-warning-threshold nil)
(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 ,commit)
;; Monkey-patch package-build so it doesn't shell out to git/hg.
(defun package-build--get-commit (&rest _)
commit)
(package-build--package (package-recipe-lookup package) version))))