Add C# development environment

README.md

@@ -32,6 +32,7 @@ Once your preferred template has been initialized, you can use the provided shel
 | Language/framework/tool  | Template                      |
 | :----------------------- | :-----------------------------|
 | [Clojure]                | [`clojure`](./clojure/)       |
+| [C#][csharp]             | [`csharp`](./csharp/)         |
 | [Cue]                    | [`cue`](./cue/)               |
 | [Dhall]                  | [`dhall`](./dhall/)           |
 | [Elixir]                 | [`elixir`](./elixir/)         |
@@ -65,6 +66,13 @@ The sections below list what each template includes. In all cases, you're free t
 - [Boot] 2.8.3
 - [Leiningen] 2.9.8
 
+### [`csharp`](./csharp/)
+
+- [dotnet] sdk 7
+- [omnisharp-roslyn]
+- [mono]
+- [msbuild]
+
 ### [`cue`](./cue/)
 
 - [Cue] 0.4.3
@@ -241,6 +249,7 @@ All of the templates have only the root [flake](./flake.nix) as a flake input. T
 [composer]: https://getcomposer.org/
 [conftest]: https://www.conftest.dev
 [cross]: https://github.com/cross-rs/cross
+[csharp]: https://dotnet.microsoft.com/en-us/languages/csharp
 [cue]: https://cuelang.org
 [damon]: https://github.com/hashicorp/damon
 [dhall]: https://dhall-lang.org
@@ -256,6 +265,7 @@ All of the templates have only the root [flake](./flake.nix) as a flake input. T
 [dhall-to-nix]: https://github.com/dhall-lang/dhall-haskell/tree/master/dhall-nix
 [dhall-toml]: https://github.com/dhall-lang/dhall-haskell/tree/master/dhall-toml
 [dhall-yaml]: https://github.com/dhall-lang/dhall-haskell/tree/master/dhall-yaml
+[dotnet]: https://dotnet.microsoft.com/en-us/
 [dune]: https://dune.build
 [elixir]: https://elixir-lang.org
 [elm]: https://elm-lang.org
@@ -279,6 +289,8 @@ All of the templates have only the root [flake](./flake.nix) as a flake input. T
 [mach-nix]: https://github.com/DavHau/mach-nix
 [maven]: https://maven.apache.org
 [mix]: https://elixir-lang.org/getting-started/mix-otp/introduction-to-mix.html
+[mono]: https://www.mono-project.com/
+[msbuild]: https://github.com/dotnet/msbuild
 [nickel]: https://nickel-lang.org
 [nim]: https://nim-lang.org
 [nimble]: https://github.com/nim-lang/nimble
@@ -297,6 +309,7 @@ All of the templates have only the root [flake](./flake.nix) as a flake input. T
 [ocaml]: https://ocaml.org
 [ocamlformat]: https://github.com/ocaml-ppx/ocamlformat
 [odoc]: https://github.com/ocaml/odoc
+[omnisharp-roslyn]: https://github.com/OmniSharp/omnisharp-roslyn
 [opa]: https://openpolicyagent.org
 [packer]: https://packer.io
 [pip]: https://pypi.org/project/pip

csharp/.envrc

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

csharp/flake.lock

@@ -0,0 +1,43 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1678901627,
+        "narHash": "sha256-U02riOqrKKzwjsxc/400XnElV+UtPUQWpANPlyazjH0=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "93a2b84fc4b70d9e089d029deacc3583435c2ed6",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1679163677,
+        "narHash": "sha256-VC0tc3EjJZFPXgucFQAYMIHce5nJWYR0kVCk4TVg6gg=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "c3912035d00ef755ab19394488b41feab95d2e40",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "release-22.11",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

csharp/flake.nix

@@ -0,0 +1,31 @@
+{
+  description = "A Nix-flake-based C# development environment";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/release-22.11";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs =
+    { self
+    , nixpkgs
+    , flake-utils
+    }:
+
+    flake-utils.lib.eachDefaultSystem (system:
+    let
+      pkgs = import nixpkgs { inherit system; };
+    in
+    {
+      devShells.default = pkgs.mkShell {
+        packages = with pkgs; [
+          #dotnet-sdk_6
+          dotnet-sdk_7
+          #dotnet-sdk_8
+          omnisharp-roslyn
+          mono
+          msbuild
+        ];
+      };
+    });
+}

flake.nix

@@ -15,6 +15,11 @@
           description = "Clojure development environment";
         };
 
+        csharp = {
+          path = ./csharp;
+          description = "C# development environment";
+        };
+
         cue = {
           path = ./cue;
           description = "Cue development environment";