vault-tasks: 0.11.2 -> 0.12.0

Also added shell completions installation

pkgs/by-name/va/vault-tasks/package.nix

@@ -2,10 +2,13 @@
   lib,
   fetchFromGitHub,
   rustPlatform,
+  stdenv,
+  buildPackages,
+  installShellFiles,
   nix-update-script,
 }:
 let
-  version = "0.11.2";
+  version = "0.12.0";
 in
 rustPlatform.buildRustPackage {
   pname = "vault-tasks";
@@ -14,12 +17,37 @@ rustPlatform.buildRustPackage {
     owner = "louis-thevenet";
     repo = "vault-tasks";
     rev = "v${version}";
-    hash = "sha256-DcnOuQ37fzLVJOteP7ZiA9IxNAd6lH6zelaO5GCvakk=";
+    hash = "sha256-PMqGqvyxgkGRVahQ+ruDA0vFT0162DrZU92nT4SMTGw=";
   };
   useFetchCargoVendor = true;
-  cargoHash = "sha256-/5CpIPdqIvxwiplMqXZ1J04oQoK9rnzDP1N7ffrbJDk=";
+  cargoHash = "sha256-34c5i2kIoQuTkm1SF7bYX109noVGaGJ47b2FCxQUyB8=";
 
-  postInstall = "install -Dm444 desktop/vault-tasks.desktop -t $out/share/applications";
+  nativeBuildInputs = [
+    installShellFiles
+  ];
+
+  postInstall =
+    ''
+      install -Dm444 desktop/vault-tasks.desktop -t $out/share/applications
+    ''
+    + (
+      let
+        vault-tasks =
+          if stdenv.buildPlatform.canExecute stdenv.hostPlatform then
+            placeholder "out"
+          else
+            buildPackages.vault-tasks;
+      in
+      ''
+        # vault-tasks tries to load a config file from ~/.config/ before generating completions
+        export HOME="$(mktemp -d)"
+
+        installShellCompletion --cmd vault-tasks \
+          --bash <(${vault-tasks}/bin/vault-tasks generate-completions bash) \
+          --fish <(${vault-tasks}/bin/vault-tasks generate-completions fish) \
+          --zsh <(${vault-tasks}/bin/vault-tasks generate-completions zsh)
+      ''
+    );
 
   passthru.updateScript = nix-update-script { };