touchegg: remove unused pcre dependency, modernize (#412110)

pkgs/by-name/to/touchegg/package.nix

@@ -10,22 +10,20 @@
   cairo,
   xorg,
   gtk3-x11,
-  pcre,
   pkg-config,
   cmake,
-  pantheon,
   withPantheon ? false,
 }:
 
-stdenv.mkDerivation rec {
+stdenv.mkDerivation (finalAttrs: {
   pname = "touchegg";
   version = "2.0.18";
 
   src = fetchFromGitHub {
     owner = "JoseExposito";
     repo = "touchegg";
-    rev = version;
-    sha256 = "sha256-7LJ5gD2e6e4edKDabqmsiXTdNKJ39557Q4sEGWF8H1U=";
+    tag = finalAttrs.version;
+    hash = "sha256-7LJ5gD2e6e4edKDabqmsiXTdNKJ39557Q4sEGWF8H1U=";
   };
 
   patches = lib.optionals withPantheon [
@@ -33,14 +31,14 @@ stdenv.mkDerivation rec {
     # Reverts https://github.com/JoseExposito/touchegg/pull/603
     (fetchpatch {
       url = "https://github.com/JoseExposito/touchegg/commit/34e947181d84620021601e7f28deb1983a154da8.patch";
-      sha256 = "sha256-qbWwmEzVXvDAhhrGvMkKN4YNtnFfRW+Yra+i6VEQX4g=";
+      hash = "sha256-qbWwmEzVXvDAhhrGvMkKN4YNtnFfRW+Yra+i6VEQX4g=";
       revert = true;
     })
     # Disable per-application gesture by default to make sure the default
     # config does not conflict with Pantheon switchboard settings.
     (fetchpatch {
       url = "https://github.com/elementary/os-patches/commit/7d9b133e02132d7f13cf2fe850b2fe4c015c3c5e.patch";
-      sha256 = "sha256-ZOGVkxiXoTORXC6doz5r9IObAbYjhsDjgg3HtzlTSUc=";
+      hash = "sha256-ZOGVkxiXoTORXC6doz5r9IObAbYjhsDjgg3HtzlTSUc=";
     })
   ];
 
@@ -56,7 +54,6 @@ stdenv.mkDerivation rec {
       pugixml
       cairo
       gtk3-x11
-      pcre
     ]
     ++ (with xorg; [
       libX11
@@ -74,12 +71,12 @@ stdenv.mkDerivation rec {
     updateScript = nix-update-script { };
   };
 
-  meta = with lib; {
+  meta = {
     homepage = "https://github.com/JoseExposito/touchegg";
     description = "Linux multi-touch gesture recognizer";
     mainProgram = "touchegg";
-    license = licenses.gpl3Plus;
-    platforms = platforms.linux;
-    teams = [ teams.pantheon ];
+    license = lib.licenses.gpl3Plus;
+    platforms = lib.platforms.linux;
+    teams = [ lib.teams.pantheon ];
   };
-}
+})