basic nix dev shell

shell.nix

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+# This sets up a basic deveopment environment using Nix shells.
+# It assumes it is running on a Linux machine with X server running.
+# Other than that, it should be fairly portable.
+
+/* Notes
+
+    * installing Qt: pip installing PySide2 or PySide6 won't work out 
+      of the box, because they expect a bunch of system libraries to be 
+      available. You can either:
+        * pip package + manual dependency resolution
+            * PySide6: didn't get to work yet
+            * PySide2:
+                * include library dependencies in buildInputs:
+                    qt5.full
+                    stdenv.cc.cc.lib
+                    glibc glib libGL zlib bzip2 openssl libpng libjpeg
+                    ffmpeg libxkbcommon fontconfig freetype zstd dbus
+                    xorg.libXrender xorg.libxcb xorg.libX11 xorg.libXext 
+                    xorg.libXcursor xorg.xhost
+                * extend paths in shellHook:
+                    $ export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:${pkgs.lib.makeLibraryPath buildInputs}"
+                    $ export PYTHONPATH=$PYTHONPATH:$VENV/${pkgs.python3.sitePackages}/
+                * then pip install PySide2
+        * using nixpks provided wrappers
+            * PySide6:
+                * include in buildInputs:
+                    python310Packages.pyside6
+                * use --system-site-packages with virtualenv so PySide6 
+                  is available in the virtual environment
+            * PySide2: similar to PySide6
+    * on Linux, with X server running, you might need to allow connections 
+      to the X server; on the host machine, run:
+        $ nix-shell -p xorg.xhost
+        $ xhost +
+
+*/
+
+{ pkgs ? import <nixpkgs> {} }:
+
+pkgs.mkShell rec {
+    buildInputs = with pkgs; [
+        # stuff
+        git man which
+
+        # python
+        python310
+        python310Packages.pip
+        python310Packages.virtualenvwrapper
+        # python310Packages.pyside6
+
+        # for PySide2, uncomment:
+        qt5.full
+        stdenv.cc.cc.lib
+        glibc glib libGL zlib bzip2 openssl libpng libjpeg
+        ffmpeg libxkbcommon fontconfig freetype zstd dbus
+        xorg.libXrender xorg.libxcb xorg.libX11 xorg.libXext 
+        xorg.libXcursor xorg.xhost
+    ];
+
+    shellHook = ''
+        SOURCE_DATE_EPOCH=$(date +%s)
+        export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:${pkgs.lib.makeLibraryPath buildInputs}"
+
+        # setup Python venv
+        export TMPDIR=/tmp  && export VENV=$(mktemp -d)
+        virtualenv --system-site-packages $VENV
+        source $VENV/bin/activate
+    '';
+}