Added error handling to __rvm_strings (thanks dreamcat4).

Began working on the new gemset interface.

scripts/cli

@@ -50,9 +50,7 @@ __rvm_parse_args() {
 
       gems|gemset)
         rvm_action="gems"
-        if [[ "name" = "$1" ]] || [[ "dir" = "$1" ]] || [[ "list" = "$1" ]] || [[ "empty" = "$1" ]] || [[ "dump" = "$1" ]] || [[ "load" = "$1" ]] || [[ "empty" = "$1" ]] || [[ "copy" = "$1" ]] || [[ "import" = "$1" ]] || [[ "export" = "$1" ]] ; then
-          export rvm_ruby_args="$*" ; export rvm_${1}_flag=1 ; shift
-        elif [[ "clear" = "$1" ]] ; then
+        if [[ "clear" = "$1" ]] ; then
           unset rvm_gem_set_name ; shift
           export rvm_ruby_gem_home="$(echo $GEM_HOME | sed 's/%.*$//')"
           export GEM_HOME="$rvm_ruby_gem_home"
@@ -73,8 +71,7 @@ __rvm_parse_args() {
             rvm_action="error"
             rvm_error_message="'gems' must be followed by a gems(et) action, see http://rvm.beginrescueend.com/gemsets/#managing for details."
           else
-            rvm_gem_set_name="$1" ; shift
-            export rvm_use_flag=1 # Default is to use the (named) gem set.
+            export rvm_ruby_args="$*" ; export rvm_${1}_flag=1 ; shift
           fi
         fi
       ;;

scripts/gems

@@ -22,6 +22,16 @@ __rvm_gems_dir() {
   echo "$rvm_ruby_gem_home"
 }
 
+__rvm_gems_create() {
+  for gemset in $(echo $gems_args) ; do
+    $rvm_scripts_path/log "info" "Creating Gemset '$gemset'."
+    gem_home="$rvm_gems_path/$rvm_ruby_string%$rvm_gem_set_name"
+    mkdir -p $gem_home 
+    ln -nfs "$HOME/.gem/cache" "$gem_home/cache"
+    $rvm_scripts_path/log "info" "Gemset '$gemset' created."
+  done ; unset gem_home
+}
+
 __rvm_gems_list() {
   if [[ -z "$rvm_ruby_selected_flag" ]] ; then __rvm_select ; fi
 
@@ -318,6 +328,8 @@ if [[ "import" = "$action" ]] || [[ "load" = "$action" ]] ; then
   __rvm_gems_import
 elif [[ "export" = "$action" ]] || [[ "dump" = "$action" ]] ; then
   __rvm_gems_export
+elif [[ "create" = "$action" ]] ; then
+  __rvm_gems_create
 elif [[ "copy" = "$action" ]] ; then
   __rvm_gems_copy
 elif [[ "empty" = "$action" ]] ; then

scripts/utility

@@ -114,11 +114,19 @@ __rvm_debug() {
 }
 
 __rvm_strings() {
+  unset results
   for rvm_ruby_string in $(echo $rvm_ruby_args) ; do
-    results="$results $(__rvm_select ; echo $rvm_ruby_string)"
-  done
-  echo $results
+    __rvm_ruby_string
+    if [[ $? -gt 0 ]] ; then
+      return 1
+    else
+      results="$results $(__rvm_select ; echo $rvm_ruby_string)"
+      unset rvm_ruby_string
+    fi
+  done 
+  echo $results 
   unset results
+  return 0
 }
 
 # ZSH has 1 based array indexing, bash has 0 based.
@@ -772,7 +780,10 @@ __rvm_make_flags() {
 # Select a gems(et) based on CLI set options and environment.
 # This only sets 'rvm_ruby_gem_home'
 __rvm_gems_select() {
-  if ! which gem >/dev/null 2>&1 ; then return 0 ; fi
+  if ! which gem >/dev/null 2>&1 ; then 
+    $rvm_scripts_path/log "error" "Rubygems not found, aborting action."
+    return 0 
+  fi
 
   rvm_ruby_global_gems_path="$rvm_gems_path/$rvm_ruby_string%global"
 
@@ -806,7 +817,10 @@ __rvm_gems_select() {
     rvm_ruby_gem_home="$rvm_gems_path/$rvm_ruby_string%$rvm_gem_set_name"
   fi
 
-  if [[ ! -d "$rvm_ruby_gem_home" ]] ; then mkdir -p $rvm_ruby_gem_home ; fi
+  # TODO: Remove this 
+  if [[ ! -d "$rvm_ruby_gem_home" ]] && [[ ! -z "$rvm_gem_set_name" ]] && [[ -z "$rvm_create_flag" ]]; then 
+    $rvm_scripts_path/log "error" "Gemset '$rvm_gem_set_name' does not exist, rvm gems create '$rvm_gem_set_name' first."
+  fi
 
   rvm_ruby_gem_path="$rvm_ruby_gem_home:$rvm_ruby_global_gems_path"