fix: use hooks in nushell set-env script to properly set GO variables on CWD change

Author: lassoColombo

README.md

@@ -43,10 +43,11 @@ To ensure the Golang environment variables are correctly set when using the `asd
   source (echo $ASDF_DATA_DIR | if test -z $it; echo $HOME/.asdf; else echo $it; end)/plugins/golang/set-env.fish
   ```
 
-- **Nushell (`env.nu`):**
+- **Nushell (`config.nu`):**
 
   ```nu
-  source (if ($env.ASDF_DATA_DIR | empty?) { echo $nu.env.HOME/.asdf } { echo $env.ASDF_DATA_DIR })/plugins/golang/set-env.nu
+  const asdf_data_dir = '~/.asdf' | path expand # this variable should be already set in your configuration as it is used to configure asdf itself
+  source ([$asdf_data_dir plugins golang set-env.nu] | path join)
   ```
 
 ## When using `go get` or `go install`

set-env.nu

@@ -1 +1,17 @@
-$env.GOROOT = (asdf which go | path split | drop 2 | path join)
+def --env asdf-update-golang-env [] {
+  let go_path = asdf which go | complete
+  if $go_path.exit_code == 0 {
+    let root = ($go_path.stdout | str trim | path split | drop 2 | path join)
+    if $root != $env.GOROOT? {
+      $env.GOROOT = $root
+      $env.GOPATH = ($root | path dirname | path join packages)
+      $env.GOBIN = ($root | path dirname | path join bin)
+    }
+  }
+}
+
+asdf-update-golang-env
+
+$env.config.hooks.env_change.PWD = (
+  $env.config.hooks.env_change | get -o PWD | default [] | append {|| asdf-update-golang-env }
+)