dstask: add shell completion support (#498792)

maintainers/maintainer-list.nix

@@ -23052,6 +23052,13 @@
     githubId = 4196789;
     name = "Nathan Ringo";
   };
+  remidupre = {
+    email = "remi+nixpkgs@dupre.io";
+    github = "remi-dupre";
+    githubId = 1173464;
+    name = "Rémi Dupré";
+    keys = [ { fingerprint = "4762 C65B F8D8 6A33 65C1  D10A 4613 02CD 1249 4653"; } ];
+  };
   remix7531 = {
     email = "remix7531@mailbox.org";
     github = "remix7531";

pkgs/by-name/ds/dstask/package.nix

@@ -1,13 +1,19 @@
 {
   lib,
+  stdenv,
   buildGoModule,
   fetchFromGitHub,
+  installShellFiles,
 }:
 
 buildGoModule (finalAttrs: {
   pname = "dstask";
   version = "1.0.1";
 
+  nativeBuildInputs = [
+    installShellFiles
+  ];
+
   src = fetchFromGitHub {
     owner = "naggie";
     repo = "dstask";
@@ -24,6 +30,13 @@ buildGoModule (finalAttrs: {
 
   doCheck = false;
 
+  postInstall = lib.optionalString (stdenv.buildPlatform.canExecute stdenv.hostPlatform) ''
+    installShellCompletion --cmd dstask \
+      --bash <($out/bin/dstask bash-completion) \
+      --fish <($out/bin/dstask fish-completion) \
+      --zsh <($out/bin/dstask zsh-completion)
+  '';
+
   # The ldflags reduce the executable size by stripping some debug stuff.
   # The other variables are set so that the output of dstask version shows the
   # git ref and the release version from github.
@@ -39,6 +52,9 @@ buildGoModule (finalAttrs: {
     description = "Command line todo list with super-reliable git sync";
     homepage = finalAttrs.src.meta.homepage;
     license = lib.licenses.mit;
-    maintainers = with lib.maintainers; [ stianlagstad ];
+    maintainers = with lib.maintainers; [
+      remidupre
+      stianlagstad
+    ];
   };
 })