nix install / run instructions (#78)

Author: jamylak

README.md

@@ -218,11 +218,45 @@ cmake --build build --config Debug
 .\build\tests\filewatcher\Debug\filewatcher_tests.exe
 ```
 
-## Nix Develop Shell
+## Nix
+### Nix Develop Shell
 ```sh
 nix develop
 ```
 
+### Nix Run / Install (one command)
+Run without installing (builds and runs):
+```sh
+nix run github:jamylak/vsdf
+```
+
+Install into your profile (then `vsdf` is on PATH):
+```sh
+nix profile install github:jamylak/vsdf
+```
+
+Open a one-off shell with `vsdf` available:
+```sh
+nix shell github:jamylak/vsdf
+```
+
+### Home Manager (flake) install
+```nix
+# flake.nix
+{
+  inputs.vsdf.url = "github:jamylak/vsdf";
+}
+```
+```nix
+# home.nix
+{ inputs, pkgs, ... }:
+{
+  home.packages = [
+    inputs.vsdf.packages.${pkgs.system}.default
+  ];
+}
+```
+
 ### Manually create your own vulkan compatible shader
 If you don't want any template prepended or you want
 to use a Vulkan shader directly you can copy `shaders/vulktemplate.frag`

default.nix

@@ -63,6 +63,7 @@ stdenv.mkDerivation {
     description = "Vulkan SDF Renderer + Hot Reloader";
     homepage = "https://github.com/jamylak/vsdf";
     license = licenses.mit;
+    mainProgram = "vsdf";
     platforms = platforms.linux ++ platforms.darwin;
   };
 }

flake.nix

@@ -29,6 +29,8 @@
           #
           # config.allowUnfree = true;
         };
+
+        vsdfPkg = pkgs.callPackage ./default.nix { };
       in
       {
         devShells.default =
@@ -71,6 +73,20 @@
             '';
         };
 
-        packages.default = pkgs.callPackage ./default.nix { };
+        packages = {
+          default = vsdfPkg;
+          vsdf = vsdfPkg;
+        };
+
+        apps = {
+          default = {
+            type = "app";
+            program = "${vsdfPkg}/bin/vsdf";
+          };
+          vsdf = {
+            type = "app";
+            program = "${vsdfPkg}/bin/vsdf";
+          };
+        };
       });
 }