goreleaser: install completions and manpages

Signed-off-by: Carlos Alexandro Becker <caarlos0@users.noreply.github.com>

pkgs/tools/misc/goreleaser/default.nix

@@ -1,4 +1,10 @@
-{ lib, buildGoModule, fetchFromGitHub }:
+{ stdenv
+, lib
+, buildGoModule
+, fetchFromGitHub
+, installShellFiles
+, buildPackages
+}:
 
 buildGoModule rec {
   pname = "goreleaser";
@@ -13,20 +19,36 @@ buildGoModule rec {
 
   vendorHash = "sha256-eVuEyQCO2/gufMJp8eUpC82wdJbbJsMKR1ZGv96C9mI=";
 
-  ldflags = [
-    "-s"
-    "-w"
-    "-X main.version=${version}"
-    "-X main.builtBy=nixpkgs"
-  ];
+  ldflags =
+    [ "-s" "-w" "-X main.version=${version}" "-X main.builtBy=nixpkgs" ];
 
   # tests expect the source files to be a build repo
   doCheck = false;
 
+  nativeBuildInputs = [ installShellFiles ];
+
+  postInstall =
+    let emulator = stdenv.hostPlatform.emulator buildPackages;
+    in ''
+      ${emulator} $out/bin/goreleaser man > goreleaser.1
+      installManPage ./goreleaser.1
+      installShellCompletion --cmd goreleaser \
+        --bash <(${emulator} $out/bin/goreleaser completion bash) \
+        --fish <(${emulator} $out/bin/goreleaser completion fish) \
+        --zsh  <(${emulator} $out/bin/goreleaser completion zsh)
+    '';
+
   meta = with lib; {
     description = "Deliver Go binaries as fast and easily as possible";
     homepage = "https://goreleaser.com";
-    maintainers = with maintainers; [ c0deaddict endocrimes sarcasticadmin techknowlogick developer-guy caarlos0 ];
+    maintainers = with maintainers; [
+      c0deaddict
+      endocrimes
+      sarcasticadmin
+      techknowlogick
+      developer-guy
+      caarlos0
+    ];
     license = licenses.mit;
   };
 }