smug: add man page (#162801)

Co-authored-by: Sandro <sandro.jaeckel@gmail.com>

pkgs/tools/misc/smug/default.nix

@@ -1,4 +1,4 @@
-{ lib, buildGoModule, fetchFromGitHub }:
+{ lib, buildGoModule, fetchFromGitHub, installShellFiles }:
 
 buildGoModule rec {
   pname = "smug";
@@ -9,12 +9,20 @@ buildGoModule rec {
   src = fetchFromGitHub {
     owner = "ivaaaan";
     repo = "smug";
-    rev = "3399f02a6e01324f5bb881f6b049c9e8d94733ee";
+    rev = "v${version}";
     sha256 = "178125835dhnaq9k42yv4pfxpyhgb5179wrxkimb59fy0nk8jzx8";
   };
 
   vendorSha256 = "1rba5rpvlr8dyhj145b5i57pm4skfpj3vm7vydkn79k6ak6x985x";
 
+  nativeBuildInputs = [ installShellFiles ];
+
+  ldflags = [ "-s" "-w" "-X=main.version=${version}" ];
+
+  postInstall = ''
+    installManPage ./man/man1/smug.1
+  '';
+
   meta = with lib; {
     homepage = "https://github.com/ivaaaan/smug";
     description = "Smug - tmux session manager";