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diff --git a/configs/shared/emacs/.emacs.d/elpa/nix-mode-20180822.214/nix-drv-mode.el b/configs/shared/emacs/.emacs.d/elpa/nix-mode-20180822.214/nix-drv-mode.el
new file mode 100644
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+++ b/configs/shared/emacs/.emacs.d/elpa/nix-mode-20180822.214/nix-drv-mode.el
@@ -0,0 +1,48 @@
+;;; 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