setup flake and crate

.drone.yml

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+---
+kind: pipeline
+type: docker
+name: check
+
+steps:
+  - name: check
+    image: nixos/nix:2.16.1
+    commands:
+      - nix --extra-experimental-features 'nix-command flakes' flake check
+
+trigger:
+  event:
+    exclude:
+    - tag
+---
+kind: signature
+hmac: ebf810489f18f8adf1691b2ffdcc5426538940c874004ec78f3d767fa02e5849
+
+...

.gitignore

@@ -0,0 +1 @@
+/target

Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "sysmon"
+version = "0.1.0"

Cargo.toml

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+[package]
+name = "sysmon"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

flake.lock

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+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1689068808,
+        "narHash": "sha256-6ixXo3wt24N/melDWjq70UuHQLxGV8jZvooRanIHXw0=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "919d646de7be200f3bf08cb76ae1f09402b6f9b4",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1690031011,
+        "narHash": "sha256-kzK0P4Smt7CL53YCdZCBbt9uBFFhE0iNvCki20etAf4=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "12303c652b881435065a98729eb7278313041e49",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs",
+        "treefmt-nix": "treefmt-nix"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
+    "treefmt-nix": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1689620039,
+        "narHash": "sha256-BtNwghr05z7k5YMdq+6nbue+nEalvDepuA7qdQMAKoQ=",
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "rev": "719c2977f958c41fa60a928e2fbc50af14844114",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  description = "A flake for building sysmon.";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+
+    flake-utils.url = "github:numtide/flake-utils";
+
+    treefmt-nix.url = "github:numtide/treefmt-nix";
+    treefmt-nix.inputs.nixpkgs.follows = "nixpkgs";
+  };
+
+  outputs = { self, nixpkgs, flake-utils, treefmt-nix, ... }@inputs:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+        cargoToml = builtins.fromTOML (builtins.readFile ./Cargo.toml);
+        treefmtEval = treefmt-nix.lib.evalModule pkgs (pkgs: {
+          projectRootFile = "flake.nix";
+          programs.rustfmt.enable = true;
+          programs.nixfmt.enable = true;
+        });
+      in {
+        packages.default = pkgs.rustPlatform.buildRustPackage {
+          inherit (cargoToml.package) name version;
+          src = ./.;
+          cargoLock.lockFile = ./Cargo.lock;
+        };
+
+        formatter = treefmtEval.config.build.wrapper;
+        checks.formatting = treefmtEval.config.build.check self;
+      });
+}

src/main.rs

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+fn main() {
+    println!("Hello, world!");
+}