完成，一个小玩具

.envrc

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+use flake

.gitignore

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+result
+.direnv

flake.lock

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+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1741006840,
+        "narHash": "sha256-/PLl/bBq+fdNR0mLFeIdEgh0O4URobH0R9+InbpdGhU=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "95eacfb6d1accf8d59a9e570d26d04ad693d2ec3",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1735554305,
+        "narHash": "sha256-zExSA1i/b+1NMRhGGLtNfFGXgLtgo+dcuzHzaWA6w3Q=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "0e82ab234249d8eee3e8c91437802b32c74bb3fd",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs",
+        "treefmt-nix": "treefmt-nix",
+        "utils": "utils"
+      }
+    },
+    "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_2"
+      },
+      "locked": {
+        "lastModified": 1739829690,
+        "narHash": "sha256-mL1szCeIsjh6Khn3nH2cYtwO5YXG6gBiTw1A30iGeDU=",
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "rev": "3d0579f5cc93436052d94b73925b48973a104204",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "type": "github"
+      }
+    },
+    "utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    utils.url = "github:numtide/flake-utils";
+    treefmt-nix.url = "github:numtide/treefmt-nix";
+  };
+
+  outputs =
+    {
+      self,
+      nixpkgs,
+      treefmt-nix,
+      utils,
+      ...
+    }:
+    utils.lib.eachDefaultSystem (
+      system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+        treefmtEval = treefmt-nix.lib.evalModule pkgs ./treefmt.nix;
+        inherit (pkgs) mkShell;
+      in
+      rec {
+        formatter = treefmtEval.config.build.wrapper;
+        devShell = mkShell {
+          nativeBuildInputs = with pkgs; [
+            tokei
+            nil
+          ];
+        };
+
+        packages.lmxg-mu50 = pkgs.callPackage ./package.nix { };
+        defaultPackage = packages.lmxg-mu50;
+      }
+    );
+}

lmxg-mu50

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+#!/usr/bin/env bash
+
+PACKAGE_DIR="@DIR@/share/mame/assets/mu50"
+WORKDIR="$XDG_DATA_HOME/lmxg-mu50"
+MAME_BIN=`which mame`
+MIDI_PORT="Midi Through Port-0"
+
+mkdir -p  $WORKDIR && cd $WORKDIR
+
+first_run_check () {
+    ROMDIR="roms/"
+    [ -d "$ROMDIR" ] || ( mkdir -p $ROMDIR && cp -r $PACKAGE_DIR $ROMDIR )
+}
+
+main() {
+    first_run_check
+    "$MAME_BIN" mu50 -w -midiin "$MIDI_PORT"
+}
+
+main

lmxg-mu50.desktop

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+[Desktop Entry]
+Type=Application
+Terminal=false
+Exec=@EXEC
+Icon=lmxg-mu50
+Name=LMXG-MU50
+Comment=Run mu50 in mame;
+Comment[zh_CN]=在 mame 中运行 mu50;
+Categories=Multimedia;

package.nix

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+{
+  stdenv,
+  fetchurl,
+
+  # dependencies
+  mame,
+  which,
+  p7zip,
+  ...
+}:
+let
+  bin = ./lmxg-mu50;
+  desktop = ./lmxg-mu50.desktop;
+  icon = ./lmxg-mu50.png;
+in
+stdenv.mkDerivation rec {
+  pname = "lmxg-mu50";
+  version = "0.1.0";
+
+  src = fetchurl {
+    url = "https://mdk.cab/download/nonmerged/mu50";
+    sha256 = "sha256-0hzR2EWmamLJrqJ6cXaReEgd8Ha4Sf7LENpIYqcbCgs=";
+  };
+
+  nativeBuildInputs = [
+    p7zip
+  ];
+
+  buildInputs = [
+    mame
+    which
+  ];
+
+  phases = [
+    "unpackPhase"
+    "installPhase"
+  ];
+
+  unpackPhase = ''
+    mkdir -p mu50
+    cd mu50
+    7z x $src
+    cd ../
+  '';
+
+  installPhase = ''
+    mkdir -p $out/bin
+    cat ${bin} | sed "s|@DIR@|$out|" > $out/bin/${pname}
+    chmod +x $out/bin/${pname}
+    mkdir -p $out/share/applications
+    cat ${desktop} | sed "s|@EXEC@|$out/bin/${pname}|" > $out/share/applications/${pname}.desktop
+    mkdir -p $out/share/pixmaps
+    cp ${icon} $out/share/pixmaps/${pname}.png
+
+    mkdir -p $out/share/mame/assets/mu50
+
+    cp -r /build/mu50 $out/share/mame/assets/
+  '';
+}

treefmt.nix

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+{
+  projectRootFile = "flake.nix";
+  programs.nixfmt.enable = true;
+}