From 1a0f9399936be25717a0acdd5d60da7d24b3175a Mon Sep 17 00:00:00 2001
From: LoveIsGrief <LoveIsGrief@users.noreply.github.com>
Date: Sat, 15 Nov 2014 22:26:37 +0100
Subject: [PATCH] Introduce nvm use --print-paths

It will print all paths that have been changed by nvm use. These paths are exported for all later nvm commands and need to be applied to the environment of other shells (in this case fish), therefore they are printed with the option.
---
 nvm.sh | 69 ++++++++++++++++++++++++++++++++++++++--------------------
 1 file changed, 45 insertions(+), 24 deletions(-)

diff --git a/nvm.sh b/nvm.sh
index 969af37..5f02501 100644
--- a/nvm.sh
+++ b/nvm.sh
@@ -531,22 +531,22 @@ nvm() {
       echo "Node Version Manager"
       echo
       echo "Usage:"
-      echo "    nvm help                    Show this message"
-      echo "    nvm --version               Print out the latest released version of nvm"
-      echo "    nvm install [-s] <version>  Download and install a <version>, [-s] from source. Uses .nvmrc if available"
-      echo "    nvm uninstall <version>     Uninstall a version"
-      echo "    nvm use <version>           Modify PATH to use <version>. Uses .nvmrc if available"
-      echo "    nvm run <version> [<args>]  Run <version> with <args> as arguments. Uses .nvmrc if available for <version>"
-      echo "    nvm current                 Display currently activated version"
-      echo "    nvm ls                      List installed versions"
-      echo "    nvm ls <version>            List versions matching a given description"
-      echo "    nvm ls-remote               List remote versions available for install"
-      echo "    nvm deactivate              Undo effects of NVM on current shell"
-      echo "    nvm alias [<pattern>]       Show all aliases beginning with <pattern>"
-      echo "    nvm alias <name> <version>  Set an alias named <name> pointing to <version>"
-      echo "    nvm unalias <name>          Deletes the alias named <name>"
-      echo "    nvm copy-packages <version> Install global NPM packages contained in <version> to current version"
-      echo "    nvm unload                  Unload NVM from shell"
+      echo "    nvm help                             Show this message"
+      echo "    nvm --version                        Print out the latest released version of nvm"
+      echo "    nvm install [-s] <version>           Download and install a <version>, [-s] from source. Uses .nvmrc if available"
+      echo "    nvm uninstall <version>              Uninstall a version"
+      echo "    nvm [--print-paths] use <version>    Modify PATH (and optionally print it) to use <version>. Uses .nvmrc if available"
+      echo "    nvm run <version> [<args>]           Run <version> with <args> as arguments. Uses .nvmrc if available for <version>"
+      echo "    nvm current                          Display currently activated version"
+      echo "    nvm ls                               List installed versions"
+      echo "    nvm ls <version>                     List versions matching a given description"
+      echo "    nvm ls-remote                        List remote versions available for install"
+      echo "    nvm deactivate                       Undo effects of NVM on current shell"
+      echo "    nvm alias [<pattern>]                Show all aliases beginning with <pattern>"
+      echo "    nvm alias <name> <version>           Set an alias named <name> pointing to <version>"
+      echo "    nvm unalias <name>                   Deletes the alias named <name>"
+      echo "    nvm copy-packages <version>          Install global NPM packages contained in <version> to current version"
+      echo "    nvm unload                           Unload NVM from shell"
       echo
       echo "Example:"
       echo "    nvm install v0.10.24        Install a specific version number"
@@ -794,20 +794,35 @@ nvm() {
       fi
     ;;
     "use" )
+      shift # start treating the args given to "use"
+
       if [ $# -eq 0 ]; then
-        nvm help
-        return 127
-      fi
-      if [ $# -eq 1 ]; then
         nvm_rc_version
         if [ -n "$NVM_RC_VERSION" ]; then
           VERSION=`nvm_version $NVM_RC_VERSION`
         fi
-      elif [ "_$2" != '_system' ]; then
-        VERSION="$(nvm_version "$2")"
       else
-        VERSION="$2"
+        # Handle options
+        while [[ $# > 0 ]]; do
+                key="$1"
+                shift
+          case $key in 
+                  --print-paths)
+              PRINT_PATHS=true
+            ;;
+
+                  *)
+              if [ "_$key" != '_system' ]; then
+                      VERSION="$(nvm_version "$key")"
+                    else
+                      VERSION="$key"
+                    fi
+              break
+            ;;
+          esac
+        done
       fi
+
       if [ -z "$VERSION" ]; then
         nvm help
         return 127
@@ -822,7 +837,7 @@ nvm() {
           return 127
         fi
       elif [ "_$VERSION" = "_∞" ]; then
-        echo "The alias \"$2\" leads to an infinite loop. Aborting." >&2
+        echo "The alias \"$1\" leads to an infinite loop. Aborting." >&2
         return 8
       fi
 
@@ -858,6 +873,12 @@ nvm() {
       if [ "$NVM_SYMLINK_CURRENT" = true ]; then
         rm -f "$NVM_DIR/current" && ln -s "$NVM_VERSION_DIR" "$NVM_DIR/current"
       fi
+      if [ $PRINT_PATHS ]; then
+        echo PATH=$PATH
+        echo NODE_PATH=$NODE_PATH
+        echo NVM_PATH=$NVM_PATH
+        echo NVM_BIN=$NVM_BIN
+      fi
       echo "Now using node $VERSION"
     ;;
     "run" )