From cdc4b7d03efa423ca252f26bd92e57279e41813d Mon Sep 17 00:00:00 2001
From: h7x4 <h7x4@nani.wtf>
Date: Sat, 25 Apr 2026 19:29:13 +0900
Subject: [PATCH] nix/package: init

---
 flake.lock      | 16 ++++++++++
 flake.nix       | 30 ++++++++++++++++-
 nix/package.nix | 85 +++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 130 insertions(+), 1 deletion(-)
 create mode 100644 nix/package.nix

diff --git a/flake.lock b/flake.lock
index cbcf50b..65a7ced 100644
--- a/flake.lock
+++ b/flake.lock
@@ -1,5 +1,20 @@
 {
   "nodes": {
+    "crane": {
+      "locked": {
+        "lastModified": 1776635034,
+        "narHash": "sha256-OEOJrT3ZfwbChzODfIH4GzlNTtOFuZFWPtW7jIeR8xU=",
+        "owner": "ipetkov",
+        "repo": "crane",
+        "rev": "dc7496d8ea6e526b1254b55d09b966e94673750f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "ipetkov",
+        "repo": "crane",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1776877367,
@@ -18,6 +33,7 @@
     },
     "root": {
       "inputs": {
+        "crane": "crane",
         "nixpkgs": "nixpkgs",
         "rust-overlay": "rust-overlay"
       }
diff --git a/flake.nix b/flake.nix
index b41fd2a..15002ce 100644
--- a/flake.nix
+++ b/flake.nix
@@ -4,9 +4,11 @@
 
     rust-overlay.url = "github:oxalica/rust-overlay";
     rust-overlay.inputs.nixpkgs.follows = "nixpkgs";
+
+    crane.url = "github:ipetkov/crane";
   };
 
-  outputs = { self, nixpkgs, rust-overlay }:
+  outputs = { self, nixpkgs, rust-overlay, crane }:
   let
     inherit (nixpkgs) lib;
 
@@ -31,6 +33,32 @@
       };
     in f system pkgs toolchain);
   in {
+    apps = forAllSystems (system: _: _: {
+      default = self.apps.${system}.kagami;
+      kagami = {
+        type = "app";
+        program = lib.getExe self.packages.${system}.kagami;
+      };
+    });
+
+    packages = forAllSystems (system: pkgs: _: {
+      default = self.packages.${system}.kagami;
+      kagami = let
+        cargoToml = builtins.fromTOML (builtins.readFile ./Cargo.toml);
+        cargoLock = ./Cargo.lock;
+        craneLib = crane.mkLib pkgs;
+        src = lib.fileset.toSource {
+          root = ./.;
+          fileset = lib.fileset.unions [
+            (craneLib.fileset.commonCargoSources ./.)
+          ];
+        };
+      in pkgs.callPackage ./nix/package.nix {
+        useCrane = true;
+        inherit cargoToml cargoLock src craneLib;
+      };
+    });
+
     devShells = forAllSystems (system: pkgs: toolchain: {
       default = pkgs.mkShell {
         nativeBuildInputs = with pkgs; [
diff --git a/nix/package.nix b/nix/package.nix
new file mode 100644
index 0000000..dbaf933
--- /dev/null
+++ b/nix/package.nix
@@ -0,0 +1,85 @@
+{
+  lib
+, rustPlatform
+, stdenv
+, buildPackages
+, installShellFiles
+, versionCheckHook
+, pkg-config
+, openssl
+
+, cargoToml
+, cargoLock
+, src
+
+, useCrane ? false
+, craneLib ? null
+}:
+let
+  mainProgram = (lib.head cargoToml.bin).name;
+  buildFunction = if useCrane then craneLib.buildPackage else rustPlatform.buildRustPackage;
+
+  pnameCraneSuffix = lib.optionalString useCrane "-crane";
+  pname = "${cargoToml.package.name}${pnameCraneSuffix}";
+
+  rustPlatformArgs = {
+    buildType = "release-lto";
+    cargoLock.lockFile = cargoLock;
+
+    doCheck = true;
+    useNextest = true;
+    nativeCheckInputs = [
+      versionCheckHook
+    ];
+  };
+
+  craneArgs = {
+    cargoLock = cargoLock;
+    cargoArtifacts = craneLib.buildDepsOnly {
+      inherit pname;
+      inherit (cargoToml.package) version;
+      src = lib.fileset.toSource {
+        root = ../.;
+        fileset = lib.fileset.unions [
+          (craneLib.fileset.cargoTomlAndLock ../.)
+        ];
+      };
+
+      nativeBuildInputs = [ pkg-config ];
+      buildInputs = [ openssl ];
+
+      cargoLock = cargoLock;
+    };
+  };
+in
+buildFunction ({
+  inherit pname;
+  inherit (cargoToml.package) version;
+  inherit src;
+
+  nativeBuildInputs = [
+    installShellFiles
+    pkg-config
+  ];
+  buildInputs = [
+    openssl
+  ];
+  postInstall = let
+    emulatorAvailable = stdenv.hostPlatform.emulatorAvailable buildPackages;
+    emulator = stdenv.hostPlatform.emulator buildPackages;
+  in lib.optionalString emulatorAvailable ''
+    installShellCompletion --cmd kagami \
+      --bash <(${emulator} $out/bin/kagami generate-completions --shell bash) \
+      --fish <(${emulator} $out/bin/kagami generate-completions --shell fish) \
+      --zsh <(${emulator} $out/bin/kagami generate-completions --shell zsh)
+  '';
+
+  meta = with lib; {
+    license = licenses.bsd3;
+    platforms = platforms.unix ++ platforms.windows;
+    inherit mainProgram;
+  };
+}
+//
+(if useCrane then craneArgs else rustPlatformArgs)
+)