bug#26792: Fix output of --help in package fish

[ng0 <ng0@pragmatique.xyz>]

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Currently the output of fish --help fails if the nroff binary is not found.
The patch fixes the issue by embeding a reference to the groff provided nroff,
fish --help produces correct output after this is applied.
-- 
https://pragmatique.xyz
PGP: https://people.pragmatique.xyz/ng0/

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From 5a22ffdccef3266f6a4050f715f304c10c259ba3 Mon Sep 17 00:00:00 2001
From: ng0 <ng0@no-reply.pragmatique.xyz>
Date: Sat, 6 May 2017 00:12:58 +0000
Subject: [PATCH] gnu: fish: Reference 'groff' to fix output of 'fish --help'.

* gnu/packages/shells.scm (fish)[native-inputs]: Add 'groff'.
(arguments): Add 'nroff' substitution in 'embed-store-paths' phase.
---
 gnu/packages/shells.scm | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/gnu/packages/shells.scm b/gnu/packages/shells.scm
index d87d58e5c..6f06acfa4 100644
--- a/gnu/packages/shells.scm
+++ b/gnu/packages/shells.scm
@@ -31,6 +31,7 @@
   #:use-module (gnu packages base)
   #:use-module (gnu packages bison)
   #:use-module (gnu packages documentation)
+  #:use-module (gnu packages groff)
   #:use-module (gnu packages libedit)
   #:use-module (gnu packages ncurses)
   #:use-module (gnu packages pcre)
@@ -112,7 +113,8 @@ direct descendant of NetBSD's Almquist Shell (@command{ash}).")
                   ((".*INSTALL.*sysconfdir.*fish.*") "")))))
     (build-system gnu-build-system)
     (native-inputs
-     `(("doxygen" ,doxygen)))
+     `(("doxygen" ,doxygen)
+       ("groff" ,groff)))
     (inputs
      `(("bc" ,bc)
        ("ncurses" ,ncurses)
@@ -133,6 +135,8 @@ direct descendant of NetBSD's Almquist Shell (@command{ash}).")
                                "/bin/bc")))
              (substitute* "share/functions/fish_update_completions.fish"
                (("python") (which "python")))
+             (substitute* "share/functions/__fish_print_help.fish"
+               (("nroff") (which "nroff")))
              #t)))))
     (synopsis "The friendly interactive shell")
     (description
-- 
2.12.2