[DRAFT] Nix flake with ss emulator (to get nix develop to work)

flake.nix

@@ -0,0 +1,132 @@
+{
+  ## This example flake comes from: 
+  ## https://nix-community.github.io/pyproject.nix/use-cases/requirements.html
+  ##
+
+  description = "Construct development shell from requirements.txt";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+
+  inputs.pyproject-nix.url = "github:nix-community/pyproject.nix";
+
+  outputs =
+    { nixpkgs
+    , pyproject-nix
+    , ...
+    }:
+    let
+      # Load/parse requirements.txt
+      project = pyproject-nix.lib.project.loadRequirementsTxt {
+        projectRoot = ./.;
+      };
+
+      pkgs = nixpkgs.legacyPackages.x86_64-linux;
+      lib = pkgs.lib;
+      python = pkgs.python3;
+      stdenv = pkgs.python311Packages.stdenv;
+
+      # embit is not currently available in nixpkgs, so we build it here
+      embit = pkgs.python3Packages.buildPythonPackage rec {
+          pname = "embit";
+          version = "0.7.0";
+          pyproject = true;
+          src = pkgs.python3Packages.fetchPypi {
+            inherit pname version;
+            hash = "sha256-Pb1CWCtcPkBiPnsq8ClWumAZ9uHKHDNj8nqp+bygM2Y=";
+          };
+          nativeBuildInputs = [
+            pkgs.python3Packages.setuptools
+          ];
+      };
+
+      # urtools is not currently available in nixpkgs, so we build it here
+      urtypes = pkgs.python3Packages.buildPythonPackage rec {
+          pname = "urtypes";
+          version = "0.7.0";
+          pyproject = true;
+          src = pkgs.fetchFromGitHub {
+            inherit pname version;
+            owner = "selfcustody";
+            repo = "urtypes";
+            rev = "main";
+            hash = "sha256-3fNgWeJyg3knvydsVpbDHUlUxkrKnIsps7+kgqt/8Rs=";
+          };
+          nativeBuildInputs = [
+            pkgs.python3Packages.setuptools
+          ];
+      };
+
+      # dataclasses (this might not be necessary since dataclasses are native to python 3.11 now)
+      dataclasses = pkgs.python3Packages.buildPythonPackage rec {
+          pname = "dataclasses";
+          version = "0.8";
+          pyproject = false;
+          src = pkgs.python3Packages.fetchPypi {
+            inherit pname version;
+            hash = "sha256-hHkGfzQqz5V9yC7EFdNVq17bfnZGuQ3G4v0dlq0ITJc=";
+          };
+          nativeBuildInputs = [
+            pkgs.python3Packages.setuptools
+          ];
+      };
+
+      # pyzbar - using https://github.com/enteropositivo/pyzbar.git@a52ff0b2e8ff714ba53bbf6461c89d672a304411#egg=pyzbar
+      # by modifying https://github.com/NixOS/nixpkgs/blob/nixos-unstable/pkgs/development/python-modules/pyzbar/default.nix#L48
+      pyzbar-seedsigner = pkgs.python3Packages.buildPythonPackage rec {
+          pname = "pyzbar";
+          version = "0.1.10-ss";
+          pyproject = true;
+          src = pkgs.fetchFromGitHub {
+            inherit pname version;
+            owner = "enteropositivo";
+            repo = "pyzbar";
+            rev = "master";
+            hash = "sha256-M51MclbldqTVUffWNRNFDTFweIwK12fpbTYGid1Aa5s=";
+          };
+
+          buildInputs = [ pkgs.zbar ];
+
+          nativeBuildInputs = [
+            pkgs.python3Packages.setuptools
+          ];
+
+          propagatedBuildInputs = with pkgs.python3Packages; [ pillow numpy ];
+
+          # find_library doesn't return an absolute path
+          # https://github.com/NixOS/nixpkgs/issues/7307
+          postPatch = ''
+            substituteInPlace pyzbar/zbar_library.py \
+              --replace \
+                "find_library('zbar')" \
+                '"${lib.getLib pkgs.zbar}/lib/libzbar${stdenv.hostPlatform.extensions.sharedLibrary}"'
+          '';
+      };
+
+      # now we build our actual environment
+      pythonEnv = pkgs.python3.withPackages (ps: with ps; [
+        embit
+        urtypes
+        dataclasses
+        pyzbar-seedsigner
+        pillow
+        qrcode
+        tkinter
+        opencv4
+        project.renderers.withPackages {inherit python; }
+      ]);
+
+    in
+    {
+      devShells.x86_64-linux.default =
+        pkgs.mkShell {
+          packages = [
+            pkgs.zbar
+            pythonEnv
+          ];
+
+          shellHook = ''
+            export SEEDSIGNER_USE_EMULATOR=true
+          '';
+        };
+    };
+}