Merge pull request #32 from glenpike/nvm-guard

Guard against running when nvm is installed.

README.md

@@ -15,7 +15,7 @@ Download the script, run it:
 ```
 ./npm-g-nosudo.sh
 ```
-or 
+or
 ```
 wget -O- https://raw.githubusercontent.com/glenpike/npm-g_nosudo/master/npm-g-nosudo.sh | sh
 ```
@@ -36,6 +36,8 @@ source ~/.bashrc
 ```
 or just open an new terminal session.
 
+The script may not play nicely with [Node Version Manager](https://github.com/creationix/nvm) so it will not run if if finds the script installed.
+
 ## License
 
 MIT © [Glen Pike](http://glenpike.co.uk)

npm-g-nosudo.sh

@@ -49,6 +49,15 @@ fi
 #save in a temporary file.
 npm -g list --depth=0 --parseable --long | cut -d: -f2 | grep -v '^npm@\|^$' >$to_reinstall
 
+if [ -f $NVM_DIR/nvm.sh ]; then
+    printf "Found a possible nvm install - this script may cause issues, so will exit\n"
+    printf "a list of your current node's npm packages is in $to_reinstall\n\n"
+    printf "If you save this file somewhere else, e.g. ~/npm-reinstall.txt, you can run\n\n"
+    printf "cat ~/npm-reinstall.txt | xargs npm -f install\n\n"
+    printf "when you add new node versions with nvm\n"
+    exit
+fi
+
 if [ 1 = ${VERBOSE} ];  then
     printf "\nRemoving existing packages temporarily - you might need your sudo password\n\n"
 fi