From a0a59a8131a7be8e2a98a5dc82610eab9cb0e117 Mon Sep 17 00:00:00 2001
From: Olli Helenius <liff@iki.fi>
Date: Wed, 20 Sep 2023 20:27:09 +0300
Subject: [PATCH 1/4] fend: add mainProgram

---
 pkgs/tools/misc/fend/default.nix | 1 +
 1 file changed, 1 insertion(+)

diff --git a/pkgs/tools/misc/fend/default.nix b/pkgs/tools/misc/fend/default.nix
index ad65708b435..091f4e16e88 100644
--- a/pkgs/tools/misc/fend/default.nix
+++ b/pkgs/tools/misc/fend/default.nix
@@ -43,5 +43,6 @@ rustPlatform.buildRustPackage rec {
     homepage = "https://github.com/printfn/fend";
     license = licenses.mit;
     maintainers = with maintainers; [ djanatyn ];
+    mainProgram = "fend";
   };
 }

From 9740d7bb58414ce45fcb8cf17acbc115aef01557 Mon Sep 17 00:00:00 2001
From: Olli Helenius <liff@iki.fi>
Date: Wed, 20 Sep 2023 20:27:35 +0300
Subject: [PATCH 2/4] fend: add a desktop file

---
 pkgs/tools/misc/fend/default.nix | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/pkgs/tools/misc/fend/default.nix b/pkgs/tools/misc/fend/default.nix
index 091f4e16e88..893094b3ba1 100644
--- a/pkgs/tools/misc/fend/default.nix
+++ b/pkgs/tools/misc/fend/default.nix
@@ -5,6 +5,8 @@
 , darwin
 , pandoc
 , installShellFiles
+, copyDesktopItems
+, makeDesktopItem
 }:
 
 rustPlatform.buildRustPackage rec {
@@ -20,7 +22,7 @@ rustPlatform.buildRustPackage rec {
 
   cargoHash = "sha256-oAkZHx33YrwRUUIoooqpy72QCq0ZkAgBZ8W8XDe2fNE=";
 
-  nativeBuildInputs = [ pandoc installShellFiles ];
+  nativeBuildInputs = [ pandoc installShellFiles copyDesktopItems ];
   buildInputs = lib.optionals stdenv.isDarwin [ darwin.apple_sdk.frameworks.Security ];
 
   postBuild = ''
@@ -38,6 +40,23 @@ rustPlatform.buildRustPackage rec {
     [[ "$($out/bin/fend "1 km to m")" = "1000 m" ]]
   '';
 
+  postInstall = ''
+    install -D -m 444 $src/icon/fend-icon-256.png $out/share/icons/hicolor/256x256/apps/fend.png
+  '';
+
+  desktopItems = [
+    (makeDesktopItem {
+      name = "fend";
+      desktopName = "fend";
+      genericName = "Calculator";
+      comment = "Arbitrary-precision unit-aware calculator";
+      icon = "fend";
+      exec = "fend";
+      terminal = true;
+      categories = [ "Utility" "Calculator" "ConsoleOnly" ];
+    })
+  ];
+
   meta = with lib; {
     description = "Arbitrary-precision unit-aware calculator";
     homepage = "https://github.com/printfn/fend";

From 1c5ade21cce3e00604254c47d6541ff1e3493910 Mon Sep 17 00:00:00 2001
From: Olli Helenius <liff@iki.fi>
Date: Wed, 20 Sep 2023 20:33:00 +0300
Subject: [PATCH 3/4] fend: add updateScript

---
 pkgs/tools/misc/fend/default.nix | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pkgs/tools/misc/fend/default.nix b/pkgs/tools/misc/fend/default.nix
index 893094b3ba1..46277cbb812 100644
--- a/pkgs/tools/misc/fend/default.nix
+++ b/pkgs/tools/misc/fend/default.nix
@@ -7,6 +7,7 @@
 , installShellFiles
 , copyDesktopItems
 , makeDesktopItem
+, nix-update-script
 }:
 
 rustPlatform.buildRustPackage rec {
@@ -57,6 +58,8 @@ rustPlatform.buildRustPackage rec {
     })
   ];
 
+  passthru.updateScript = nix-update-script { };
+
   meta = with lib; {
     description = "Arbitrary-precision unit-aware calculator";
     homepage = "https://github.com/printfn/fend";

From fdf790bbe4449b8459a7ae3f3a3b5805782887f0 Mon Sep 17 00:00:00 2001
From: Olli Helenius <liff@iki.fi>
Date: Wed, 20 Sep 2023 20:33:41 +0300
Subject: [PATCH 4/4] fend: add liff as a maintainer

---
 pkgs/tools/misc/fend/default.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/tools/misc/fend/default.nix b/pkgs/tools/misc/fend/default.nix
index 46277cbb812..d2b945850f3 100644
--- a/pkgs/tools/misc/fend/default.nix
+++ b/pkgs/tools/misc/fend/default.nix
@@ -64,7 +64,7 @@ rustPlatform.buildRustPackage rec {
     description = "Arbitrary-precision unit-aware calculator";
     homepage = "https://github.com/printfn/fend";
     license = licenses.mit;
-    maintainers = with maintainers; [ djanatyn ];
+    maintainers = with maintainers; [ djanatyn liff ];
     mainProgram = "fend";
   };
 }