[bug#34511] Add qtcolorwidgets

[<pkill9@runbox.com>]

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This is a QT module that provides color management, e.g. a color wheel. https://gitlab.com/mattia.basaglia/Qt-Color-Widgets

I'm adding this as a dependency for drawpile which I will also submit once this package definition is merged. There is unfortunately no release available for this, however drawpile bundles it's own copy of qtcolorwidgets if it doesn't find one.

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From 33d629801822ce2f3967f61a38ffe91205ea19bf Mon Sep 17 00:00:00 2001
From: Pkill -9 <pkill9@runbox.com>
Date: Sun, 17 Feb 2019 09:42:28 +0000
Subject: [PATCH] gnu: Add qtcolorwidgets.

* gnu/packages/qt.scm (qtcolorwidgets): New variable.
---
 gnu/packages/qt.scm | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/gnu/packages/qt.scm b/gnu/packages/qt.scm
index 664309cb5..e3296b582 100644
--- a/gnu/packages/qt.scm
+++ b/gnu/packages/qt.scm
@@ -2232,3 +2232,28 @@ a binding language:
 @item Creating from Singleton QML QObject defined in the binded language
 @end itemize\n")
     (license license:lgpl3)))                    ;version 3 only (+ exception)
+
+(define-public qtcolorwidgets
+  (package
+    (name "qtcolorwidgets")
+    (version "git")
+    (source (origin
+              (method git-fetch)
+              (uri (git-reference
+                    (url "https://gitlab.com/mattia.basaglia/Qt-Color-Widgets")
+                    (commit "a95f72e935fe9e046061a1d1c3930cbfbcb533e0")))
+              (file-name (git-file-name name version))
+              (sha256
+               (base32
+                "0dkiwlqh2gwhlp78c1fmchj3shl4p9inspcl96ya5aa8mn6kydy8"))))
+    (build-system cmake-build-system)
+    (arguments
+     `(#:tests? #f)) ;; No tests.
+    (native-inputs
+     `(("qttools" ,qttools)))
+    (inputs
+     `(("qtbase" ,qtbase)))
+    (home-page "https://gitlab.com/mattia.basaglia/Qt-Color-Widgets")
+    (synopsis "Color management widgets")
+    (description "QTColorWidgets provides QT widgets for managing colors.")
+    (license license:lgpl3+)))
-- 
2.20.1