add nix package and installation docs

.gitignore

@@ -27,6 +27,9 @@ Thumbs.db
 # go
 vendor/
 
+# nix
+result
+
 # misc
 *.log
 *.tmp

README.md

@@ -4,10 +4,40 @@ a friendlier `ss` / `netstat` for humans. inspect network connections with a cle
 
 ## install
 
+### go
+
 ```bash
 go install github.com/karol-broda/snitch@latest
 ```
 
+### nixos / nix
+
+```bash
+# try it
+nix run github:karol-broda/snitch
+
+# install to profile
+nix profile install github:karol-broda/snitch
+
+# or add to flake inputs
+{
+  inputs.snitch.url = "github:karol-broda/snitch";
+}
+# then use: inputs.snitch.packages.${system}.default
+```
+
+### binary
+
+download from [releases](https://github.com/karol-broda/snitch/releases):
+
+```bash
+# amd64
+curl -L https://github.com/karol-broda/snitch/releases/latest/download/snitch_linux_amd64.tar.gz | tar xz
+sudo mv snitch /usr/local/bin/
+
+# or install .deb/.rpm/.apk from releases
+```
+
 ## quick start
 
 ```bash

flake.lock

@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1756217674,
-        "narHash": "sha256-TH1SfSP523QI7kcPiNtMAEuwZR3Jdz0MCDXPs7TS8uo=",
+        "lastModified": 1765687488,
+        "narHash": "sha256-7YAJ6xgBAQ/Nr+7MI13Tui1ULflgAdKh63m1tfYV7+M=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "4e7667a90c167f7a81d906e5a75cba4ad8bee620",
+        "rev": "d02bcc33948ca19b0aaa0213fe987ceec1f4ebe1",
         "type": "github"
       },
       "original": {

flake.nix

@@ -1,5 +1,5 @@
 {
-  description = "go 1.25.0 dev flake";
+  description = "snitch - a friendlier ss/netstat for humans";
 
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.05";
@@ -10,44 +10,29 @@
     let
       supportedSystems = import systems;
       forAllSystems = f: nixpkgs.lib.genAttrs supportedSystems (system: f system);
-    in
-    {
-      overlays.default = final: prev:
+
+      # go 1.25 overlay (required until nixpkgs has it)
+      goOverlay = final: prev:
         let
           version = "1.25.0";
-
           platformInfo = {
             "x86_64-linux" = { suffix = "linux-amd64"; sri = "sha256-KFKvDLIKExObNEiZLmm4aOUO0Pih5ZQO4d6eGaEjthM="; };
             "aarch64-linux" = { suffix = "linux-arm64"; sri = "sha256-Bd511plKJ4NpmBXuVTvVqTJ9i3mZHeNuOLZoYngvVK4="; };
-            "i686-linux" = { suffix = "linux-386"; sri = "sha256-jGAt2dmbyUU7OZXSDOS684LMUIVZAKDs5d6ZKd9KmTo="; };
-            "armv6l-linux" = { suffix = "linux-armv6l"; sri = "sha256-paj4GY/PAOHkhbjs757gIHeL8ypAik6Iczcb/ORYzQk="; };
-
             "x86_64-darwin" = { suffix = "darwin-amd64"; sri = "sha256-W9YOgjA3BiwjB8cegRGAmGURZxTW9rQQWXz1B139gO8="; };
             "aarch64-darwin" = { suffix = "darwin-arm64"; sri = "sha256-VEkyhEFW2Bcveij3fyrJwVojBGaYtiQ/YzsKCwDAdJw="; };
           };
-
           hostSystem = prev.stdenv.hostPlatform.system;
-
-          chosen =
-            if prev.lib.hasAttr hostSystem platformInfo then platformInfo.${hostSystem}
-            else
-              throw ''
-                unsupported system: ${hostSystem}
-                add a mapping for your platform using the upstream tarball + sri sha256
-              '';
+          chosen = platformInfo.${hostSystem} or (throw "unsupported system: ${hostSystem}");
         in
         {
-          go_1_25_bin = prev.stdenvNoCC.mkDerivation {
+          go_1_25 = prev.stdenvNoCC.mkDerivation {
             pname = "go";
-            version = version;
-
+            inherit version;
             src = prev.fetchurl {
               url = "https://go.dev/dl/go${version}.${chosen.suffix}.tar.gz";
               hash = chosen.sri;
             };
-
             dontBuild = true;
-
             installPhase = ''
               runHook preInstall
               mkdir -p "$out"/{bin,share}
@@ -57,35 +42,57 @@
               ln -s "$out/share/go/bin/gofmt" "$out/bin/gofmt"
               runHook postInstall
             '';
-
             dontPatchELF = true;
             dontStrip = true;
-
-            meta = with prev.lib; {
-              description = "go compiler and tools v${version}";
-              homepage = "https://go.dev/dl/";
-              license = licenses.bsd3;
-              platforms = [ hostSystem ];
           };
         };
+    in
+    {
+      overlays.default = final: prev: {
+        snitch = final.callPackage ./nix/package.nix { };
       };
 
       packages = forAllSystems (system:
-        let pkgs = import nixpkgs { inherit system; overlays = [ self.overlays.default ]; };
-        in {
-          default = pkgs.go_1_25_bin;
-          go_1_25_bin = pkgs.go_1_25_bin;
+        let
+          pkgs = import nixpkgs {
+            inherit system;
+            overlays = [ goOverlay ];
+          };
+        in
+        {
+          default = pkgs.buildGoModule {
+            pname = "snitch";
+            version = self.shortRev or self.dirtyShortRev or "dev";
+            src = self;
+            vendorHash = "sha256-BNNbA72puV0QSLkAlgn/buJJt7mIlVkbTEBhTXOg8pY=";
+            env.CGO_ENABLED = 0;
+            ldflags = [
+              "-s" "-w"
+              "-X snitch/cmd.version=${self.shortRev or "dev"}"
+              "-X snitch/cmd.commit=${self.shortRev or "unknown"}"
+            ];
+            meta = with pkgs.lib; {
+              description = "a friendlier ss/netstat for humans";
+              homepage = "https://github.com/karol-broda/snitch";
+              license = licenses.mit;
+              platforms = platforms.linux;
+              mainProgram = "snitch";
+            };
+          };
         }
       );
 
       devShells = forAllSystems (system:
-        let pkgs = import nixpkgs { inherit system; overlays = [ self.overlays.default ]; };
-        in {
+        let
+          pkgs = import nixpkgs {
+            inherit system;
+            overlays = [ goOverlay ];
+          };
+        in
+        {
           default = pkgs.mkShell {
-            packages = [ pkgs.go_1_25_bin pkgs.git ];
-
+            packages = [ pkgs.go_1_25 pkgs.git ];
             GOTOOLCHAIN = "local";
-
             shellHook = ''
               echo "go toolchain: $(go version)"
             '';