Add vix command

Based on https://github.com/rwxrob/dot/blob/main/scripts/vic and
https://github.com/etomtomm/dot/blob/main/bin/vix.

home-manager/opdavies/PW05CH3L.nix

@@ -42,6 +42,7 @@
     tag-release
     time-until
     update-all-git-repos
+    vix
   ];
 
   xdg.configFile."pam-gnupg".text = ''

home-manager/opdavies/t480.nix

@@ -112,6 +112,7 @@
     todos-edit
     unmounter
     update-all-git-repos
+    vix
   ];
 
   xdg.configFile."pam-gnupg".text = ''

packages/default.nix

@@ -26,6 +26,7 @@ in
   todos-edit = callPackage ./todos-edit.nix { };
   unmounter = callPackage ./unmounter.nix { };
   update-all-git-repos = callPackage ./update-all-git-repos.nix { };
+  vix = callPackage ./vix.nix { };
 
   vimPlugins = prev.vimPlugins // vimPlugins;
 }

packages/vix.nix

@@ -0,0 +1,10 @@
+{ pkgs }:
+
+pkgs.writeShellApplication {
+  name = "vix";
+
+  text = ''
+    cmd=$(command -v "$1")
+    test -n "$cmd" && exec "$EDITOR" "$cmd"
+  '';
+}