nix developement environments

Author: eddien24

.envrc

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+use flake

.gitignore

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 /target
+result
+Cargo.lock

README.md

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-Template to be used with [cargo-generate](https://crates.io/crates/cargo-generate). 
+# Eddie's Rust Template
+Minimal template for Rust projects to be used with Nix developement environments.
 
-Differences to `cargo new`:
-- My preferred `rustfmt.toml`
+### Requirements
+- Flakes-enabled installation of [Nix](https://nixos.org/download/)
+- [cargo-generate](https://crates.io/crates/cargo-generate)
+
+### Installation
+```shell
+cargo generate eddien24/rust-template
+```
+
+### Usage
+- `nix develop`: start developement shell. Will create `flake.lock` the first time it is run.
+- `nix build`: build project
+- `nix run`: run project
+
+Modified from [MordragT/nix-templates](https://github.com/MordragT/nix-templates/tree/master/rust-stable).

flake.nix

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+{
+  description = "Rust development template";
+
+  inputs = {
+    utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = {
+    self,
+    nixpkgs,
+    utils,
+    ...
+  }@inputs:
+    utils.lib.eachDefaultSystem
+    (
+      system: let
+        pkgs = import nixpkgs {inherit system;};
+        toolchain = pkgs.rustPlatform;
+      in rec
+      {
+        # Executed by `nix build`
+        packages.default = toolchain.buildRustPackage {
+          pname = "template";
+          version = "0.1.0";
+          src = ./.;
+          cargoLock.lockFile = ./Cargo.lock;
+
+          # For other makeRustPlatform features see:
+          # https://github.com/NixOS/nixpkgs/blob/master/doc/languages-frameworks/rust.section.md#cargo-features-cargo-features
+        };
+
+        # Executed by `nix run`
+        apps.default = utils.lib.mkApp {drv = packages.default;};
+
+        # Used by `nix develop`
+        devShells.default = pkgs.mkShell {
+          buildInputs = with pkgs; [
+            (with toolchain; [
+              cargo
+              rustc
+              rustLibSrc
+            ])
+            clippy
+            rustfmt
+            pkg-config
+            rust-analyzer
+          ];
+
+          # Specify the rust-src path (many editors rely on this)
+          RUST_SRC_PATH = "${toolchain.rustLibSrc}";
+        };
+      }
+    );
+}