Create and activate venv via Nix Flake

CONTRIBUTING.md

@@ -64,10 +64,10 @@ _Learn more about setting up a virtual environment [here](https://docs.python.or
 
   - Run the "TagStudio.sh" script and the program should launch! (Make sure that the script is marked as executable if on Linux). Note that launching from the script from outside of a terminal will not launch a terminal window with any debug or crash information. If you wish to see this information, just launch the shell script directly from your terminal with `./TagStudio.sh`.
 
-  - **NixOS** (TagStudio.sh)
+  - **NixOS** (Nix Flake)
     > [!WARNING]
     > Support for NixOS is still a work in progress.
-    - Use the provided `flake.nix` file to create and enter a working environment by running `nix develop`. Then, run the `TagStudio.sh` script.
+    - Use the provided [Flake](https://nixos.wiki/wiki/Flakes) to create and enter a working environment by running `nix develop`. Then, run the program via `python3 tagstudio/tag_studio.py` from the root directory.
 
 - **Any** (No Scripts)
 

flake.nix

@@ -1,10 +1,12 @@
 {
+  description = "Tag Studio Development Environment";
+
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
 
     qt6Nixpkgs = {
-      # Commit bumping to qt6.6.3
-      url = "github:NixOS/nixpkgs/f862bd46d3020bcfe7195b3dad638329271b0524"; 
+      # Commit bumping to qt6.7.1
+      url = "github:NixOS/nixpkgs/47da0aee5616a063015f10ea593688646f2377e4";
     };
   };
 
@@ -15,6 +17,9 @@
     qt6Pkgs = qt6Nixpkgs.legacyPackages.x86_64-linux;
   in {
     devShells.x86_64-linux.default = pkgs.mkShell {
+      name = "Tag Studio Virtual Environment";
+      venvDir = "./.venv";
+
       LD_LIBRARY_PATH = pkgs.lib.makeLibraryPath [
         pkgs.gcc-unwrapped
         pkgs.zlib
@@ -35,18 +40,19 @@
         qt6Pkgs.qt6.full
         qt6Pkgs.qt6.qtbase
       ];
+
       buildInputs = with pkgs; [
         cmake
         gdb
         zstd
-        python312Packages.pip
         python312Full
-        python312Packages.virtualenv # run virtualenv .
+        python312Packages.pip
         python312Packages.pyusb # fixes the pyusb 'No backend available' when installed directly via pip
+        python312Packages.venvShellHook # Initializes a venv in $venvDir
+        ruff # Ruff cannot be installed via pip
+        mypy # MyPy cannot be installed via pip
 
         libgcc
-        makeWrapper
-        bashInteractive
         glib
         libxkbcommon
         freetype
@@ -70,14 +76,34 @@
         # this is for the shellhook portion
         qt6Pkgs.qt6.wrapQtAppsHook
       ];
+
+      # Run after the virtual environment is created
+      postVenvCreation = ''
+        unset SOURCE_DATE_EPOCH
+
+        echo Installing dependencies into virtual environment
+        pip install -r requirements.txt
+        pip install -r requirements-dev.txt
+        # Hacky solution to not fight with other dev deps
+        # May show failure if skipped due to same version with nixpkgs
+        pip uninstall -y mypy ruff
+      '';
+
       # set the environment variables that Qt apps expect
-      shellHook = ''
-        export QT_QPA_PLATFORM=wayland
+      postShellHook = ''
+        unset SOURCE_DATE_EPOCH
+
+        export QT_QPA_PLATFORM="wayland;xcb"
         export LIBRARY_PATH=/usr/lib:/usr/lib64:$LIBRARY_PATH
         # export LD_LIBRARY_PATH=${pkgs.stdenv.cc.cc.lib}/lib/:/run/opengl-driver/lib/
         export QT_PLUGIN_PATH=${pkgs.qt6.qtbase}/${pkgs.qt6.qtbase.qtPluginPrefix}
         bashdir=$(mktemp -d)
         makeWrapper "$(type -p bash)" "$bashdir/bash" "''${qtWrapperArgs[@]}"
+
+        echo Activating Virtual Environment
+        source $venvDir/bin/activate
+        export PYTHONPATH=$PWD/$venvDir/${pkgs.python312Full.sitePackages}:$PYTHONPATH
+
         exec "$bashdir/bash"
       '';
     };