Make repo a nix flake

.drone.yml

@@ -2,23 +2,37 @@
 kind: pipeline
 name: default
 
-workspace:
-  base: /drone/diplonat
+node:
+  nix-daemon: 1
 
 steps:
-- name: code style
-  image: rust:1.47
-  commands:
-  - rustup toolchain install nightly-x86_64-unknown-linux-gnu
-  - rustup component add rustfmt --toolchain nightly
-  - cargo +nightly fmt --all -- --check
-# - name: code quality
-#   image: rust:1.47
+  #- name: check formatting
+  #  image: nixpkgs/nix:nixos-22.05
   #  commands:
-#   - cargo clippy -- --deny warnings
-- name: test
-  image: rust:1.47
-  commands:
-  - cargo build --verbose --all
-  - cargo test --verbose --all
+  #    - nix run --extra-experimental-features nix-command --extra-experimental-features flakes github:nixos/nixpkgs/nixos-22.05#cargo fmt -- --check
 
+  - name: build
+    image: nixpkgs/nix:nixos-22.05
+    commands:
+      - nix build --extra-experimental-features nix-command --extra-experimental-features flakes .#debug.x86_64-linux.diplonat
+
+  - name: test
+    image: nixpkgs/nix:nixos-22.05
+    commands:
+      - nix build --extra-experimental-features nix-command --extra-experimental-features flakes .#test.x86_64-linux.diplonat
+      - ./result-bin/bin/diplonat-*
+
+trigger:
+  event:
+  - custom
+  - push
+  - pull_request
+  - tag
+  - cron
+
+
+---
+kind: signature
+hmac: c8525b399be9c11eec7f6549242aceda6442114e3b71b587c03c074178c06bf5
+
+...

.gitignore

@@ -1,3 +1,5 @@
 target/
+result
+result-bin
 *.swp
 .env

flake.lock

@@ -0,0 +1,108 @@
+{
+  "nodes": {
+    "cargo2nix": {
+      "inputs": {
+        "flake-compat": "flake-compat",
+        "flake-utils": "flake-utils",
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "rust-overlay": "rust-overlay"
+      },
+      "locked": {
+        "lastModified": 1666087781,
+        "narHash": "sha256-trKVdjMZ8mNkGfLcY5LsJJGtdV3xJDZnMVrkFjErlcs=",
+        "owner": "Alexis211",
+        "repo": "cargo2nix",
+        "rev": "a7a61179b66054904ef6a195d8da736eaaa06c36",
+        "type": "github"
+      },
+      "original": {
+        "owner": "Alexis211",
+        "repo": "cargo2nix",
+        "rev": "a7a61179b66054904ef6a195d8da736eaaa06c36",
+        "type": "github"
+      }
+    },
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1650374568,
+        "narHash": "sha256-Z+s0J8/r907g149rllvwhb4pKi8Wam5ij0st8PwAh+E=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "b4a34015c698c7793d592d66adbab377907a2be8",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1659877975,
+        "narHash": "sha256-zllb8aq3YO3h8B/U0/J1WBgAL8EX5yWf5pMj3G0NAmc=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "c0e246b9b83f637f4681389ecabcb2681b4f3af0",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1665657542,
+        "narHash": "sha256-mojxNyzbvmp8NtVtxqiHGhRfjCALLfk9i/Uup68Y5q8=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "a3073c49bc0163fea6a121c276f526837672b555",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "a3073c49bc0163fea6a121c276f526837672b555",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "cargo2nix": "cargo2nix",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "rust-overlay": {
+      "inputs": {
+        "flake-utils": [
+          "cargo2nix",
+          "flake-utils"
+        ],
+        "nixpkgs": [
+          "cargo2nix",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1664247556,
+        "narHash": "sha256-J4vazHU3609ekn7dr+3wfqPo5WGlZVAgV7jfux352L0=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "524db9c9ea7bc7743bb74cdd45b6d46ea3fcc2ab",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,36 @@
+{
+  description = "A very basic flake";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/a3073c49bc0163fea6a121c276f526837672b555";
+  inputs.cargo2nix = {
+    # As of 2022-10-18: two small patches over unstable branch, one for clippy and one to fix feature detection
+    url = "github:Alexis211/cargo2nix/a7a61179b66054904ef6a195d8da736eaaa06c36";
+    inputs.nixpkgs.follows = "nixpkgs";
+  };
+
+  outputs = { self, nixpkgs, cargo2nix }:
+  let
+    pkgs = import nixpkgs {
+      system = "x86_64-linux";
+      overlays = [ cargo2nix.overlays.default ];
+    };
+    packageFun = import ./Cargo.nix;
+    rustVersion = "1.63.0";
+
+    compile = args: compileMode:
+      let
+        packageSet = pkgs.rustBuilder.makePackageSet ({
+          inherit packageFun rustVersion;
+        } // args);
+      in
+        packageSet.workspace.diplonat {
+          inherit compileMode;
+        };
+  in
+  {
+    test.x86_64-linux.diplonat = compile { release = false; } "test";
+    debug.x86_64-linux.diplonat = compile { release = false; } "build";
+    packages.x86_64-linux.diplonat = compile { release = true; } "build";
+    packages.x86_64-linux.default = self.packages.x86_64-linux.diplonat;
+  };
+}