[bug#45661] Install TeXmac's desktop file

[Maxime Devos <maximedevos@telenet.be>]

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Hi Guix!

This patch adjusts the package definition
to install the .desktop file of TeXmacs. Previously,
TeXmacs didn't show up in GNOME Shell, but now it does!
-- 
Maxime Devos <maximedevos@telenet.be>
PGP Key: C1F3 3EE2 0C52 8FDB 7DD7  011F 49E3 EE22 1917 25EE
Freenode handle: mdevos

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From 15ea12a7437095f934b48f11abf9e263eb2e80f0 Mon Sep 17 00:00:00 2001
From: Maxime Devos <maximedevos@telenet.be>
Date: Mon, 4 Jan 2021 19:44:45 +0100
Subject: [PATCH] gnu: texmacs: Install desktop file.
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

* gnu/packages/text-editors.scm (texmacs)[arguments]: Add
  ‘install-desktop-file’ phase.
---
 gnu/packages/text-editors.scm | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/gnu/packages/text-editors.scm b/gnu/packages/text-editors.scm
index 749b93e29f..81915ca52b 100644
--- a/gnu/packages/text-editors.scm
+++ b/gnu/packages/text-editors.scm
@@ -12,6 +12,7 @@
 ;;; Copyright © 2020 Marius Bakke <mbakke@fastmail.com>
 ;;; Copyright © 2020 Tom Zander <tomz@freedommail.ch>
 ;;; Copyright © 2020 Mark Meyer <mark@ofosos.org>
+;;; Copyright © 2020 Maxime Devos <maximedevos@telenet.be>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -788,6 +789,14 @@ editors.")
                  (("/usr/share")
                   (string-append out "/share")))
                #t)))
+         (add-after 'install 'install-desktop-file
+           (lambda* (#:key outputs #:allow-other-keys)
+             ;; Install desktop file.
+             (let* ((out (assoc-ref outputs "out"))
+                    (apps (string-append out "/share/applications"))
+                    (source "TeXmacs/misc/mime/texmacs.desktop"))
+               (install-file source apps)
+               #t)))
          (add-before 'configure 'gzip-flags
            (lambda _
              (substitute* "Makefile.in"
-- 
2.29.2


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