feat: Added nix support

- Added nix derivation to package software
- Lets you try the program without installing it via `nix run`
- Allows NixOS users to install and run the program :]
- Updated README with details on how to use it

Author: of-the-stars

.envrc

@@ -0,0 +1 @@
+use flake

.gitignore

@@ -1 +1,3 @@
 /target
+/.direnv
+/result

README.md

@@ -24,6 +24,20 @@ curl -fsSL https://raw.githubusercontent.com/unhappychoice/steamfetch/main/insta
 brew install unhappychoice/tap/steamfetch
 ```
 
+### Nix
+
+Try it without installing via Nix
+
+```bash
+nix run github:unhappychoice/steamfetch
+```
+
+To pass arguments, add `--` to the end of the `nix run` invocation
+
+```bash
+nix run github:unhappychoice/steamfetch -- --demo # Everything after `--` is passed as an argument to steamfetch
+```
+
 ### Download Binary
 
 Download the latest release from [GitHub Releases](https://github.com/unhappychoice/steamfetch/releases).

flake.lock

@@ -0,0 +1,97 @@
+{
+  description = "of-the-star's custom rust development flake";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+    crane.url = "github:ipetkov/crane";
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
+
+  outputs =
+    {
+      self,
+      nixpkgs,
+      flake-utils,
+      crane,
+      rust-overlay,
+    }:
+    flake-utils.lib.eachDefaultSystem (
+      system:
+      let
+        pkgs = import nixpkgs {
+          inherit system;
+          overlays = [ (import rust-overlay) ];
+        };
+
+        # Builds the rust components from the toolchain file, or defaults back to the latest nightly build
+        rust-toolchain =
+          if builtins.pathExists ./rust-toolchain.toml then
+            pkgs.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml
+          else
+            pkgs.rust-bin.selectLatestNightlyWith (
+              toolchain:
+              toolchain.default.override {
+                # extensions = [ "rust-src" ];
+              }
+            );
+
+        # Instantiates custom craneLib using toolchain
+        craneLib = (crane.mkLib pkgs).overrideToolchain rust-toolchain;
+
+        src = craneLib.cleanCargoSource ./.;
+        pname = craneLib.crateNameFromCargoToml { cargoToml = ./Cargo.toml; }.pname;
+
+        # Common arguments shared between buildPackage and buildDepsOnly
+        commonArgs = {
+          inherit src;
+          strictDeps = true;
+
+          buildInputs = with pkgs; [
+            openssl
+          ];
+
+          nativeBuildInputs = with pkgs; [
+            pkg-config
+          ];
+        };
+
+        cargoArtifacts = craneLib.buildDepsOnly (commonArgs);
+
+        crane-package = craneLib.buildPackage (
+          commonArgs
+          // {
+            inherit cargoArtifacts;
+            postInstall = ''
+              mkdir -p $out/bin
+              cp ./target/release/libsteam_api.* $out/bin/.
+            '';
+          }
+        );
+      in
+      {
+        devShells.default = pkgs.mkShell {
+          # Inherits buildInputs from crane-package
+          inputsFrom = [ crane-package ];
+
+          # Additional packages for the dev environment
+          packages = with pkgs; [
+          ];
+
+          shellHook = "";
+
+          env = {
+            # Needed for rust-analyzer
+            RUST_SRC_PATH = "${rust-toolchain}/lib/rustlib/src/rust/library";
+          };
+        };
+
+        packages.default = crane-package;
+
+        formatter.${system} = nixpkgs.legacyPackages.${system}.nixfmt-tree;
+      }
+    );
+}