flake: Add pytec runnables to devShell

Makes it possible to directly run `plot` and `autotune` in the shell.

flake.nix

@@ -49,6 +49,19 @@
         dontFixup = true;
         auditable = false;
       };
+
+      pytec-dev-wrappers = pkgs.runCommandNoCC "pytec-dev-wrappers" { } ''
+        mkdir -p $out/bin
+        for program in ${self}/pytec/*.py; do
+          if [ -x $program ]; then
+            progname=`basename -s .py $program`
+            outname=$out/bin/$progname
+            echo "#!${pkgs.bash}/bin/bash" >> $outname
+            echo "exec python3 -m $progname \"\$@\"" >> $outname
+            chmod 755 $outname
+          fi
+        done
+      '';
     in {
       packages.x86_64-linux = {
         inherit thermostat;
@@ -64,9 +77,13 @@
         packages = with pkgs; [
           rust llvm
           openocd dfu-util rlwrap
+          pytec-dev-wrappers
           ] ++ (with python3Packages; [
             numpy matplotlib
           ]);
+        shellHook = ''
+          export PYTHONPATH=`pwd`/pytec:$PYTHONPATH
+        '';
       };
     };
 }