Adding ndenv plugin for node env manager

plugins/ndenv/ndenv.plugin.zsh

@@ -0,0 +1,42 @@
+_homebrew-installed() {
+  type brew &> /dev/null
+}
+
+FOUND_NDENV=0
+ndenvdirs=("$HOME/.ndenv" "/usr/local/ndenv" "/opt/ndenv" "/usr/local/opt/ndenv")
+
+if _homebrew-installed && ndenv_homebrew_path=$(brew --prefix ndenv 2>/dev/null); then
+    ndenvdirs=($ndenv_homebrew_path "${ndenvdirs[@]}")
+    unset ndenv_homebrew_path
+fi
+
+for ndenvdir in "${ndenvdirs[@]}" ; do
+  if [ -d $ndenvdir/bin -a $FOUND_NDENV -eq 0 ] ; then
+    FOUND_NDENV=1
+
+    if [[ $NDENV_ROOT = '' ]]; then
+      NDENV_ROOT=$ndenvdir
+    fi
+
+    export NDENV_ROOT
+    export PATH=${ndenvdir}/bin:$PATH
+
+    eval "$(ndenv init --no-rehash - zsh)"
+
+    alias nodes="ndenv versions"
+
+    function current_node() {
+      echo "$(ndenv version-name)"
+    }
+
+    function ndenv_prompt_info() {
+      echo "$(current_node)"
+    }
+  fi
+done
+unset ndenvdir
+
+if [ $FOUND_NDENV -eq 0 ] ; then
+  alias nodes='node -v'
+  function ndenv_prompt_info() { echo "system: $(node -v | cut -f-2 -d ' ')" }
+fi