build: add nix flake

.github/workflows/test.yml

@@ -77,6 +77,40 @@ jobs:
       - name: Build
         run: cargo build --release
 
+  nix:
+    name: Nix Build
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Check for Nix-relevant changes
+        uses: dorny/paths-filter@v3
+        id: filter
+        with:
+          filters: |
+            nix:
+              - 'flake.nix'
+              - 'flake.lock'
+              - 'Cargo.toml'
+              - 'Cargo.lock'
+              - 'src/**'
+              - 'tests/**'
+
+      - name: Install Nix
+        if: steps.filter.outputs.nix == 'true'
+        uses: DeterminateSystems/determinate-nix-action@v3
+
+      - name: Setup Nix cache
+        if: steps.filter.outputs.nix == 'true'
+        uses: DeterminateSystems/magic-nix-cache-action@v8
+        with:
+          use-flakehub: false
+
+      - name: Check flake
+        if: steps.filter.outputs.nix == 'true'
+        run: nix flake check
+
   # E2E tests run only on main branch with secrets
   e2e:
     name: E2E Tests

.github/workflows/update-flake-lock.yml

@@ -0,0 +1,22 @@
+name: Update flake.lock
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: '0 0 1 * *' # Monthly on the 1st
+
+jobs:
+  update:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
+    steps:
+      - uses: actions/checkout@v4
+      - uses: DeterminateSystems/determinate-nix-action@v3
+      - uses: DeterminateSystems/update-flake-lock@main
+        with:
+          pr-title: "nix: update flake.lock"
+          pr-labels: |
+            dependencies
+            nix

.gitignore

@@ -1,6 +1,9 @@
 /target
 .DS_Store
 
+# Nix
+result
+
 # Generated npm platform packages
 /npm/darwin-arm64/
 /npm/darwin-x64/

README.md

@@ -33,6 +33,33 @@ cargo install jj-ryu
 
 Binary name is `ryu`.
 
+### Nix
+
+```sh
+# Try it
+nix run github:dmmulroy/jj-ryu
+
+# Install to profile
+nix profile install github:dmmulroy/jj-ryu
+```
+
+Or add to your flake inputs:
+
+```nix
+{
+  inputs.jj-ryu.url = "github:dmmulroy/jj-ryu";
+
+  outputs = { self, nixpkgs, jj-ryu, ... }: {
+    nixosConfigurations.myhost = nixpkgs.lib.nixosSystem {
+      modules = [{
+        nixpkgs.overlays = [ jj-ryu.overlays.default ];
+        environment.systemPackages = [ pkgs.jj-ryu ];
+      }];
+    };
+  };
+}
+```
+
 ## Quick start
 
 ```sh

flake.nix

@@ -0,0 +1,100 @@
+{
+  description = "jj-ryu - Stacked PRs CLI for Jujutsu";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    rust-overlay.url = "github:oxalica/rust-overlay";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs =
+    {
+      self,
+      nixpkgs,
+      rust-overlay,
+      flake-utils,
+    }:
+    {
+      overlays.default = final: prev: {
+        jj-ryu = self.packages.${final.system}.ryu;
+      };
+    }
+    // flake-utils.lib.eachDefaultSystem (
+      system:
+      let
+        overlays = [ (import rust-overlay) ];
+        pkgs = import nixpkgs { inherit system overlays; };
+        lib = pkgs.lib;
+
+        rust = pkgs.rust-bin.stable."1.89.0".default;
+        rustPlatform = pkgs.makeRustPlatform {
+          cargo = rust;
+          rustc = rust;
+        };
+
+        version = (builtins.fromTOML (builtins.readFile ./Cargo.toml)).package.version;
+        versionSuffix = if self ? rev then "-${builtins.substring 0 7 self.rev}" else "-dirty";
+
+        src = pkgs.lib.fileset.toSource {
+          root = ./.;
+          fileset = pkgs.lib.fileset.unions [
+            ./Cargo.toml
+            ./Cargo.lock
+            ./src
+            ./tests
+          ];
+        };
+
+        meta = with pkgs.lib; {
+          description = "Stacked PRs for Jujutsu with GitHub/GitLab support";
+          homepage = "https://github.com/dmmulroy/jj-ryu";
+          changelog = "https://github.com/dmmulroy/jj-ryu/releases/tag/v${version}";
+          license = licenses.mit;
+          maintainers = [ ];
+          mainProgram = "ryu";
+          platforms = platforms.unix;
+        };
+
+        ryu = rustPlatform.buildRustPackage {
+          pname = "jj-ryu";
+          version = "${version}${versionSuffix}";
+          inherit src meta;
+          cargoLock = {
+            lockFile = ./Cargo.lock;
+          };
+          nativeBuildInputs = [
+            pkgs.pkg-config
+            pkgs.jujutsu
+            pkgs.git
+          ];
+          buildInputs = lib.optionals pkgs.stdenv.isDarwin [ pkgs.libiconv ];
+          doCheck = true;
+        };
+      in
+      {
+        packages = {
+          default = ryu;
+          ryu = ryu;
+        };
+
+        apps.default = flake-utils.lib.mkApp { drv = ryu; };
+        apps.ryu = flake-utils.lib.mkApp { drv = ryu; };
+
+        checks = {
+          ryu = ryu;
+        };
+
+        devShells.default = pkgs.mkShell {
+          inputsFrom = [ ryu ];
+          packages = [
+            rust
+            pkgs.pkg-config
+            pkgs.rust-analyzer
+            pkgs.cargo-watch
+          ];
+        };
+
+        formatter = pkgs.nixfmt-rfc-style;
+      }
+    );
+}