Show all available versions in ls

Adds a cache of all versions available on nodejs.org using simple empty files as placeholders. When a new version is installed, it will replace the placeholder with a directory.

This makes it easier for users to see what versions are available for install, and what the latest and stable versions are.

nvm.sh

@@ -8,6 +8,41 @@
 # Auto detect the NVM_DIR using magic bash 3.x stuff
 export NVM_DIR=$(dirname ${BASH_ARGV[0]})
 
+# Expand a version using the version cache
+version()
+{
+    PATTERN=$1
+    VERSION=''
+    # If it looks like an explicit version, don't do anything funny
+    if [[ $PATTERN == v*.*.* ]]; then
+        VERSION=$PATTERN
+    fi
+    # The default version is the current one
+    if [ ! $PATTERN -o $PATTERN = 'current' ]; then
+        VERSION=`node -v 2>/dev/null`
+    fi
+    if [ $PATTERN = 'stable' ]; then
+        PATTERN='*.*[02468].'
+    fi
+    if [ $PATTERN = 'latest' ]; then
+        PATTERN='*.*.'
+    fi
+    if [ $PATTERN = 'all' ]; then
+        (cd $NVM_DIR; ls -dG v* 2>/dev/null || echo "N/A")
+        return
+    fi
+    if [ ! "$VERSION" ]; then
+        VERSION=`(cd $NVM_DIR; ls -d v${PATTERN}* 2>/dev/null) | sort -t. -k 2,1n -k 2,2n -k 3,3n | tail -n1`
+    fi
+    if [ ! "$VERSION" ]; then
+        echo "N/A"
+    elif [ -e "$NVM_DIR/$VERSION" ]; then
+        (cd $NVM_DIR; ls -dG $VERSION)
+    else
+        echo "$VERSION"
+    fi
+}
+
 nvm()
 {
   if [ $# -lt 1 ]; then
@@ -23,8 +58,10 @@ nvm()
       echo "    nvm help                Show this message"
       echo "    nvm install <version>   Download and install a <version>"
       echo "    nvm use <version>       Modify PATH to use <version>"
-      echo "    nvm ls                  List versions currently installed"
+      echo "    nvm ls                  List versions (installed versions are blue)"
+      echo "    nvm ls <version>        List versions matching a given description"
       echo "    nvm deactivate          Undo effects of NVM on current shell"
+      echo "    nvm sync                Update the local cache of available versions"
       echo
       echo "Example:"
       echo "    nvm install v0.2.5"
@@ -38,6 +75,7 @@ nvm()
       fi
       START=`pwd`
       mkdir -p "$NVM_DIR/src" && \
+      rm -f "$NVM_DIR/$2" && \
       cd "$NVM_DIR/src" && \
       wget "http://nodejs.org/dist/node-$2.tar.gz" -N && \
       tar -xzf "node-$2.tar.gz" && \
@@ -93,16 +131,31 @@ nvm()
     ;;
     "ls" )
       if [ $# -ne 1 ]; then
-        nvm help
+        version $2
         return;
       fi
-      for f in $NVM_DIR/v*; do
-        if [[ $PATH == *$f/bin* ]]; then
-          echo "v${f##*v} *"
-        else
-          echo "v${f##*v}"
-        fi
+      version all
+      for P in {stable,latest,current}; do
+          echo -ne "$P: \t"; version $P
       done
+      echo "# use 'nvm sync' to update from nodejs.org"
+    ;;
+    "sync" )
+        (cd $NVM_DIR
+        rm -f v* 2>/dev/null
+        echo -n "Syncing with nodejs.org..."
+        for VER in `curl -s http://nodejs.org/dist/ | grep 'node-v.*\.tar\.gz' | sed -e 's/.*node-//' -e 's/\.tar\.gz.*//'`
+            do touch $VER
+        done
+        echo " done."
+        )
+    ;;
+    "clear-cache" )
+        rm -f $NVM_DIR/v*
+        echo "Cache cleared."
+    ;;
+    "version" )
+        version $2
     ;;
     * )
       nvm help