flake-ify

.envrc

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

.gitignore

@@ -2,3 +2,6 @@
 /.vscode
 /.idea
 entries
+
+.direnv/
+result

FLAKES.md

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+## flakes
+
+https://nixos.wiki/wiki/Flakes
+
+## dev shell
+
+```
+nix develop
+```
+
+## build project
+
+```
+nix build
+```
+
+run the executable:
+
+```
+./result/bin/dlog
+```
+
+## keeping `Cargo.nix` up to date
+
+this should be run if `Cargo.toml` / `Cargo.lock` are changed. `Cargo.nix` is used for `nix build`.
+
+```
+cargo2nix -f
+```

flake.nix

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+{
+  description = "dlog";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+    rust-overlay.url = "github:oxalica/rust-overlay";
+    cargo2nix.url = "github:cargo2nix/cargo2nix/feature/add-basic-flake-support";
+  };
+
+  outputs = { self, nixpkgs, flake-utils, rust-overlay, cargo2nix, ... }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        overlays = [
+          (import rust-overlay)
+          (import "${cargo2nix}/overlay")
+        ];
+        pkgs = import nixpkgs {
+          inherit system overlays;
+        };
+      in
+      with pkgs;
+      {
+        devShell = mkShell {
+          buildInputs = [
+            rust-bin.stable.latest.default
+            cargo2nix.defaultPackage.${system}
+          ];
+        };
+
+        defaultPackage =
+          (pkgs.rustBuilder.makePackageSet' {
+            rustChannel = "stable";
+            packageFun = import ./Cargo.nix;
+          }).workspace.dlog {};
+      });
+}