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;;; nix-drv-mode.el --- Major mode for viewing .drv files
;; Maintainer: Matthew Bauer <mjbauer95@gmail.com>
;; Homepage: https://github.com/NixOS/nix-mode
;; Version: 1.2.1
;; Keywords: nix, languages, tools, unix
;; Package-Requires: ((emacs "24.3"))
;; This file is NOT part of GNU Emacs.
;;; Commentary:
;; A major mode for viewing Nix derivations (.drv files). See the Nix
;; manual for more information available at
;; https://nixos.org/nix/manual/.
;;; Code:
(require 'json-mode)
(require 'nix)
(defvar-local nix-drv-mode nil)
;;;###autoload
(defun nix-drv-mode ()
"Pretty print Nix’s .drv files."
(interactive)
(when (string-match (format "^%s/" nix-store-dir) (buffer-file-name))
(if nix-drv-mode
(progn
(erase-buffer)
(insert-file-contents (buffer-file-name))
(setq nix-drv-mode nil)
(set-buffer-modified-p nil)
(read-only-mode nil))
(let ((inhibit-read-only t))
(setq nix-drv-mode t)
(erase-buffer)
(insert (shell-command-to-string
(format "%s show-derivation \"%s\""
nix-executable
(buffer-file-name))))
(json-mode)
(set-buffer-modified-p nil)
(read-only-mode 1)))))
(provide 'nix-drv-mode)
;;; nix-drv-mode.el ends here
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