From 58637415bedb8a91d916ab6ed6f318f7b7023c00 Mon Sep 17 00:00:00 2001
From: Tobias Geerinckx-Rice <me@tobias.gr>
Date: Mon, 17 Jun 2019 03:02:34 +0200
Subject: [PATCH] gnu: youtube-viewer: Refer to youtube-dl.
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* gnu/packages/video.scm (youtube-viewer)[inputs]: Add youtube-dl.
[arguments]: Add ‘refer-to-inputs’ phase.
---
 gnu/packages/video.scm | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/gnu/packages/video.scm b/gnu/packages/video.scm
index d1fdd12177..760c057ac0 100644
--- a/gnu/packages/video.scm
+++ b/gnu/packages/video.scm
@@ -1627,7 +1627,10 @@ (define-public youtube-viewer
        ("perl-libwww" ,perl-libwww)
        ("perl-lwp-protocol-https" ,perl-lwp-protocol-https)
        ("perl-mozilla-ca" ,perl-mozilla-ca)
-       ("perl-unicode-linebreak" ,perl-unicode-linebreak)))
+       ("perl-unicode-linebreak" ,perl-unicode-linebreak)
+
+       ;; Some videos play without youtube-dl, but others silently fail to.
+       ("youtube-dl" ,youtube-dl)))
     (arguments
      `(#:modules ((guix build perl-build-system)
                   (guix build utils)
@@ -1635,6 +1638,13 @@ (define-public youtube-viewer
        #:module-build-flags '("--gtk")
        #:phases
        (modify-phases %standard-phases
+         (add-after 'unpack 'refer-to-inputs
+           (lambda* (#:key inputs #:allow-other-keys)
+             (substitute* "lib/WWW/YoutubeViewer.pm"
+               (("'youtube-dl'")
+                (format #f "'~a/bin/youtube-dl'"
+                        (assoc-ref inputs "youtube-dl"))))
+             #t))
          (add-after 'install 'install-desktop
            (lambda* (#:key outputs #:allow-other-keys)
              (let* ((out (assoc-ref outputs "out"))