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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-1 (rcp)
(let* ((default-directory (package-recipe--working-tree rcp)))
(unwind-protect
(let ((files (package-build-expand-files-spec rcp t)))
(unless files
(error "Unable to find files matching recipe patterns"))
(if (> (length files) 1)
(package-build--build-multi-file-package rcp files)
(package-build--build-single-file-package rcp files))))))
(defun melpa2nix-build-package ()
(unless noninteractive
(error "`melpa2nix-build-package' is to be used only with -batch"))
(pcase command-line-args-left
(`(,package ,version ,commit)
(let ((recipe (package-recipe-lookup package)))
(setf (oref recipe commit) commit)
(setf (oref recipe version) version)
(melpa2nix-build-package-1 recipe)))))
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