Subject: Re: [bug#28060] [PATCH] gnu: Add emacs-nixos-mode.

From: Oleg Pykhalov <[email-masked]>
Date: Sat, 12 Aug 2017 21:39:52 +0300

Oleg Pykhalov <[email-masked]> writes:

> ng0 <[email-masked]> writes:
>
> …
>
>>> > We have Nix in (gnu packages package-management).
>>> > Why do you fetch it again when we could just add
>>> > another output to the nix package?
>>> 
>>> Didn't think about this.  It will not fetch again if sources are same, I
>>> guess.  But it will be more proper way for sure.  The problem is that
>>> I'm not very familiar with mixing build systems for now.  This bug
>>> report probably needs to wait me or somebody else will do it.
>
> …
>
>> Yet another option: inherit the package "nix" and adjust accordingly.
>
> I think this is the best option.

Don't need the license field.

>From 0ab1fceaf6eead2c72b4764ce91ecfe005097de4 Mon Sep 17 00:00:00 2001
From: Oleg Pykhalov <[email-masked]>
Date: Sat, 12 Aug 2017 09:48:53 +0300
Subject: [PATCH] gnu: Add emacs-nix-mode.

* gnu/packages/emacs.scm (emacs-nix-mode): New variable.
---
 gnu/packages/emacs.scm | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/gnu/packages/emacs.scm b/gnu/packages/emacs.scm
index bb5d2349f..5a69990c6 100644
--- a/gnu/packages/emacs.scm
+++ b/gnu/packages/emacs.scm
@@ -5226,6 +5226,23 @@ multiplexer.")
 editing RPM spec files.")
     (license license:gpl2+)))
 
+(define-public emacs-nix-mode
+  (package
+    (inherit nix)
+    (name "emacs-nix-mode")
+    (build-system emacs-build-system)
+    (arguments
+     `(#:phases
+       (modify-phases %standard-phases
+         (add-after 'unpack 'chdir-elisp
+           ;; Elisp directory is not in root of the source.
+           (lambda _
+             (chdir "misc/emacs"))))))
+    (synopsis "Emacs major mode for editing Nix expressions")
+    (description "@code{nixos-mode} provides an Emacs major mode for editing
+Nix expressions.  It supports syntax highlighting, indenting and refilling of
+comments.")))
+
 (define-public emacs-git-messenger
   (package
     (name "emacs-git-messenger")
-- 
2.14.1

-- 
Best regards,

Oleg.