Add setup for nvm (Node Version Manager)

zsh/nodejs.zsh

@@ -40,3 +40,32 @@ install_node_global_packages () {
 
   npm install -g "${packages[@]}"
 }
+
+if [ -f "$HOME/.nvm/nvm.sh" ]; then
+  export NVM_DIR="$HOME/.nvm"
+
+  # If default alias is set, add that Node version's bin direcotry to PATH to
+  # ensure CLI tools from npm packages work before nvm is lazy-loaded.
+  if [ -s "$NVM_DIR/alias/default" ]; then
+    path_prepend "$NVM_DIR/versions/node/$(cat "$NVM_DIR/alias/default")/bin"
+  fi
+
+  # lazy-load nvm
+  nvm() {
+    load-nvm
+    nvm "$@"
+  }
+
+  _nvm() {
+    load-nvm
+    _nvm "$@"
+  }
+
+  compctl -K _nvm nvm
+
+  load-nvm() {
+    unset -f load-nvm nvm _nvm
+    source "$NVM_DIR/nvm.sh"
+    [ -s "$NVM_DIR/bash_completion" ] && source "$NVM_DIR/bash_completion"
+  }
+fi