chore(nu): automatically set the node_modules bin dir on cd

When we are moving around the file system I always want to be able to use the
locally installed executables from my node modules.

Sometimes versions of programs like prettier have different outcomes. I always
want to be using the local version rather than the system installed version.

site-modules/core/files/nushell/config.nu

@@ -1,4 +1,4 @@
-use path.nu
+use path.nu *
 
 use fzf.nu *
 use neovim.nu *
@@ -16,6 +16,7 @@ $env.config = {
       PWD: [
         {|_, after| nvm dir-hook $after }
         {|_, after| rvm-dir-hook $after }
+        {|_, after| node-modules-dir-hook $after }
       ]
     }
   }

site-modules/core/files/nushell/scripts/path.nu

@@ -6,3 +6,15 @@ export-env {
     | prepend ([$env.HOME ".cargo" "bin"] | path join)
     | str join ":"
 }
+
+export def --env node-modules-dir-hook [dir: string] {
+  let nodePath = ([$dir, "node_modules", ".bin"] | path join)
+  if ($nodePath | path exists) {
+    $env.PATH = $env.PATH
+    | split row ":"
+    | where {|x| not ($x | str contains "node_modules")}
+    | prepend $nodePath
+    | str join ":"
+  }
+}
+