Making `nvm install` use the version, even if it's already installed. Fixes #410

nvm.sh

@@ -306,7 +306,11 @@ nvm() {
         shift
       done
 
-      [ -d "$NVM_DIR/$VERSION" ] && echo "$VERSION is already installed." && return
+      if [ -d "$NVM_DIR/$VERSION" ]; then
+        echo "$VERSION is already installed."
+        nvm use "$VERSION"
+        return $?
+      fi
 
       if [ "$VERSION" = "N/A" ]; then
         echo "Version '$provided_version' not found - try \`nvm ls-remote\` to browse available versions."

test/slow/nvm install/install already installed uses it

@@ -0,0 +1,24 @@
+#!/bin/sh
+
+die () { echo $@ ; exit 1; }
+
+. ../../../nvm.sh
+
+[ "$(nvm install invalid.invalid)" = "Version 'invalid.invalid' not found - try \`nvm ls-remote\` to browse available versions." ] || die "nvm installing an invalid version did not print a nice error message"
+
+# Remove the stuff we're clobbering.
+[ -e ../../../v0.9.7 ] && rm -R ../../../v0.9.7
+[ -e ../../../v0.9.12 ] && rm -R ../../../v0.9.12
+
+# Install from binary
+nvm install 0.9.7
+nvm install 0.9.12
+
+nvm use 0.9.7
+
+node --version | grep v0.9.7 || die "precondition failed: node doesn't start at 0.9.7"
+
+nvm install 0.9.12
+
+node --version | grep v0.9.12 || die "nvm install on already installed version doesn't use it"
+