nasmfmt: init at unstable-2021-04-24

This is a little basic formatter for (N)ASM files. I've been getting
into hobby osdev a bit.

Last and first release was too long ago, so I just picked the latest
commit.

`buildGoPackage` is used since this doesn't have a `go.mod`.

pkgs/development/tools/nasmfmt/default.nix

···
+{ lib, buildGoPackage, fetchFromGitHub, go }:
+
+buildGoPackage rec {
+  pname = "nasmfmt";
+  version = "unstable-2021-04-24";
+
+  src = fetchFromGitHub {
+    owner = "yamnikov-oleg";
+    repo = "nasmfmt";
+    rev = "efba220c5252eb717f080d266dcc8304efdeab40";
+    sha256 = "sha256-snhXF+IP0qzl43rKQ0Ugfo1zv3RyNfjxnMpjZEBgPQg=";
+  };
+
+  goPackagePath = "github.com/yamnikov-oleg/nasmfmt";
+
+  meta = with lib; {
+    description = "Formatter for NASM source files";
+    homepage = "https://github.com/yamnikov-oleg/nasmfmt";
+    platforms = go.meta.platforms;
+    license = licenses.mit;
+    maintainers = with maintainers; [ ckie ];
+  };
+}

pkgs/top-level/all-packages.nix

···
 
   nasm = callPackage ../development/compilers/nasm { };
 
+  nasmfmt = callPackage ../development/tools/nasmfmt { };
+
   nvidia_cg_toolkit = callPackage ../development/compilers/nvidia-cg-toolkit { };
 
   obliv-c = callPackage ../development/compilers/obliv-c {