From 7b937e9152989c6f6e8c7a44f014cbc84aed640f Mon Sep 17 00:00:00 2001
From: Vincent Breitmoser <look@my.amazin.horse>
Date: Sat, 29 Jan 2022 12:36:58 +0100
Subject: [PATCH] rxvt-unicode-emoji: init as variant of rxvt-unicode, with
 wide glyph (emoji) support

Patches adapted from https://aur.archlinux.org/packages/rxvt-unicode-truecolor-wide-glyphs/
See also https://github.com/blueyed/PKGBUILD-rxvt-unicode-wide/commit/a7241b714da18259621a8d404817ac60f8849ee8
---
 .../rxvt-unicode/default.nix                  | 33 ++++++++++++++++---
 pkgs/top-level/all-packages.nix               |  8 +++++
 2 files changed, 36 insertions(+), 5 deletions(-)

diff --git a/pkgs/applications/terminal-emulators/rxvt-unicode/default.nix b/pkgs/applications/terminal-emulators/rxvt-unicode/default.nix
index 70ff4a4555d7..0e9402cf4953 100644
--- a/pkgs/applications/terminal-emulators/rxvt-unicode/default.nix
+++ b/pkgs/applications/terminal-emulators/rxvt-unicode/default.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchurl, makeDesktopItem
+{ lib, stdenv, fetchurl, fetchpatch, makeDesktopItem
 , libX11, libXt, libXft, libXrender
 , ncurses, fontconfig, freetype
 , pkg-config, gdk-pixbuf, perl
@@ -6,6 +6,7 @@
 , perlSupport      ? true
 , gdkPixbufSupport ? true
 , unicode3Support  ? true
+, emojiSupport     ? false
 }:
 
 let
@@ -22,6 +23,13 @@ let
     genericName = pname;
     categories = "System;TerminalEmulator;";
   };
+
+  fetchPatchFromAUR = { package, name, rev, sha256 }:
+    fetchpatch rec {
+      url = "https://aur.archlinux.org/cgit/aur.git/plain/${name}?h=${package}&id=${rev}";
+      extraPrefix = "";
+      inherit name sha256;
+    };
 in
 
 with lib;
@@ -44,18 +52,33 @@ stdenv.mkDerivation {
 
   outputs = [ "out" "terminfo" ];
 
-  patches = [
+  patches = (if emojiSupport then [
+    # the required patches to libXft are in nixpkgs by default, see
+    # ../../../servers/x11/xorg/overrides.nix
+    (fetchPatchFromAUR {
+      name = "enable-wide-glyphs.patch";
+      package = "rxvt-unicode-truecolor-wide-glyphs";
+      rev = "69701a09c2c206233952b84bc966407f6774f1dc";
+      sha256 = "0jfcj0ahky4dxdfrhqvh1v83mblhf5nak56dk1vq3bhyifdg7ffq";
+    })
+    (fetchPatchFromAUR {
+      name = "improve-font-rendering.patch";
+      package = "rxvt-unicode-truecolor-wide-glyphs";
+      rev = "69701a09c2c206233952b84bc966407f6774f1dc";
+      sha256 = "1jj5ai2182nq912279adihi4zph1w4dvbdqa1pwacy4na6y0fz9y";
+    })
+  ] else [
     ./patches/9.06-font-width.patch
+  ]) ++ [
     ./patches/256-color-resources.patch
-  ] ++ optional stdenv.isDarwin ./patches/makefile-phony.patch;
-
+  ]++ optional stdenv.isDarwin ./patches/makefile-phony.patch;
 
   configureFlags = [
     "--with-terminfo=${placeholder "terminfo"}/share/terminfo"
     "--enable-256-color"
     (enableFeature perlSupport "perl")
     (enableFeature unicode3Support "unicode3")
-  ];
+  ] ++ optional emojiSupport "--enable-wide-glyphs";
 
   LDFLAGS = [ "-lfontconfig" "-lXrender" "-lpthread" ];
   CFLAGS = [ "-I${freetype.dev}/include/freetype2" ];
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 0bb3cbe5ec3b..d538e047070c 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -1160,10 +1160,18 @@ with pkgs;
 
   rxvt-unicode = callPackage ../applications/terminal-emulators/rxvt-unicode/wrapper.nix { };
 
+  rxvt-unicode-emoji = rxvt-unicode.override {
+    rxvt-unicode-unwrapped = rxvt-unicode-unwrapped-emoji;
+  };
+
   rxvt-unicode-plugins = import ../applications/terminal-emulators/rxvt-unicode-plugins { inherit callPackage; };
 
   rxvt-unicode-unwrapped = callPackage ../applications/terminal-emulators/rxvt-unicode { };
 
+  rxvt-unicode-unwrapped-emoji = rxvt-unicode-unwrapped.override {
+    emojiSupport = true;
+  };
+
   sakura = callPackage ../applications/terminal-emulators/sakura { };
 
   st = callPackage ../applications/terminal-emulators/st {