feat(hm): run fish if bash is started interactively

Setting `fish` as the login shell causes issues, this is safer to do.

modules/hm/default.nix

@@ -50,6 +50,14 @@ in
       };
 
       programs = {
+        # Switch to fish if bash is started interactively
+        bash.initExtra = ''
+          if [[ $(${pkgs.procps}/bin/ps --no-header --pid=$PPID --format=comm) != "fish" && -z ''${BASH_EXECUTION_STRING} ]]
+          then
+            shopt -q login_shell && LOGIN_OPTION='--login' || LOGIN_OPTION=""
+            exec ${pkgs.fish}/bin/fish $LOGIN_OPTION
+          fi
+        '';
         # Better cat (bat)
         bat = {
           enable = true;