satty: add shell completions

pkgs/by-name/sa/satty/package.nix

@@ -10,6 +10,7 @@
 , libadwaita
 , pango
 , copyDesktopItems
+, installShellFiles
 }:
 
 rustPlatform.buildRustPackage rec {
@@ -30,6 +31,7 @@ rustPlatform.buildRustPackage rec {
     copyDesktopItems
     pkg-config
     wrapGAppsHook4
+    installShellFiles
   ];
 
   buildInputs = [
@@ -43,6 +45,11 @@ rustPlatform.buildRustPackage rec {
 
   postInstall = ''
     install -Dt $out/share/icons/hicolor/scalable/apps/ assets/satty.svg
+
+    installShellCompletion --cmd satty \
+      --bash completions/satty.bash \
+      --fish completions/satty.fish \
+      --zsh completions/_satty
   '';
 
   desktopItems = [ "satty.desktop" ];