emacsPackages.rect-mark: use trivialBuild

pkgs/applications/editors/emacs/elisp-packages/rect-mark/default.nix

@@ -1,35 +1,26 @@
-{ lib, stdenv, fetchurl, emacs }:
+{ lib
+, trivialBuild
+, fetchFromGitHub
+, emacs
+ }:
 
-stdenv.mkDerivation {
+trivialBuild rec {
   pname = "rect-mark";
   version = "1.4";
 
-  src = fetchurl {
-    url = "http://emacswiki.org/emacs/download/rect-mark.el";
-    sha256 = "0pyyg53z9irh5jdfvh2qp4pm8qrml9r7lh42wfmdw6c7f56qryh8";
+  src = fetchFromGitHub {
+    owner = "emacsmirror";
+    repo = pname;
+    rev = version;
+    hash = "sha256-/8T1VTYkKUxlNWXuuS54S5jpl4UxJBbgSuWc17a/VyM=";
   };
 
-  dontUnpack = true;
-
   buildInputs = [ emacs ];
 
-  buildPhase = ''
-    cp $src rect-mark.el
-    emacs --batch -f batch-byte-compile rect-mark.el
-  '';
-
-  installPhase = ''
-    runHook preInstall
-    install -d $out/share/emacs/site-lisp
-    install rect-mark.el* $out/share/emacs/site-lisp
-    runHook postInstall
-  '';
-
-  meta = {
-    description = "Mark a rectangle of text with highlighting";
+  meta = with lib; {
     homepage = "http://emacswiki.org/emacs/RectangleMark";
-    license = lib.licenses.gpl2Plus;
-
-    platforms = lib.platforms.all;
+    description = "Mark a rectangle of text with highlighting";
+    license = licenses.gpl2Plus;
+    inherit (emacs.meta) platforms;
   };
 }