[PATCH] gnu: windowmaker: Fix invocation of 'wmsetbg'.

[Kei Kebreau <kei@openmailbox.org>]

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This patch allows Window Maker to run wmsetbg properly instead of
showing an error as it has been.

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From a113116da6f9f6574e9fde12e69a9d3acdc87769 Mon Sep 17 00:00:00 2001
From: Kei Kebreau <kei@openmailbox.org>
Date: Sun, 23 Oct 2016 13:50:05 -0400
Subject: [PATCH] gnu: windowmaker: Fix invocation of 'wmsetbg'.

* gnu/packages/gnustep.scm (windowmaker)[arguments]: Add substitution of
40-character limit with a 107-character limit.
---
 gnu/packages/gnustep.scm | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/gnu/packages/gnustep.scm b/gnu/packages/gnustep.scm
index 6c365cb..8f72bb3 100644
--- a/gnu/packages/gnustep.scm
+++ b/gnu/packages/gnustep.scm
@@ -60,7 +60,13 @@
                         (string-append "\"" bin "/wmaker.inst")))
                      (substitute* '("src/defaults.c" "WPrefs.app/Menu.c")
                        (("\"wmsetbg")
-                        (string-append "\"" bin "/wmsetbg")))))
+                        (string-append "\"" bin "/wmsetbg")))
+                     ;; Add enough cells to the command character array to
+                     ;; allow passing our large path to the wmsetbg binary.
+                     ;; The path to wmsetbg in Guix requires 67 extra characters.
+                     (substitute* "src/defaults.c"
+                       (("len = strlen\\(text\\) \\+ 40;")
+                        (string-append "len = strlen(text) + 107;")))))
                  (alist-cons-after
                   'install 'wrap
                   (lambda* (#:key outputs #:allow-other-keys)
-- 
2.10.1


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