Report default or local version.

If no argument is passed to the default or local sub commands, report
the currently configured version.

README.md

@@ -134,6 +134,9 @@ overridden by a per-project `.rbenv-version` file, or by setting the
 The special version name `system` tells rbenv to use the system Ruby
 (detected by searching your `$PATH`).
 
+When run without a version number the currently configured default
+version is reported.
+
 ### <a name="section_3.2"></a> 3.2 local
 
 Sets a local per-project Ruby version by writing the version name to
@@ -143,6 +146,9 @@ overrides the default, and can be overridden itself by setting the
 
     $ rbenv local rbx-1.2.4
 
+When run without a version number the currently configured local
+version is reported.
+
 ### <a name="section_3.3"></a> 3.3 versions
 
 Lists all Ruby versions known to rbenv, and shows an asterisk next to

libexec/rbenv-default

@@ -1,12 +1,16 @@
 #!/usr/bin/env bash -e
 
 RBENV_VERSION="$1"
+VERSION_FILE="${HOME}/.rbenv/default"
 if [ -z "$RBENV_VERSION" ]; then
-  echo "usage: rbenv default VERSION" >&2
-  exit 1
-fi
-
-# Make sure the specified version is installed
-rbenv-prefix "$RBENV_VERSION" >/dev/null
+  if [[ -e "$VERSION_FILE" ]]; then
+    cat "$VERSION_FILE"
+  else
+    echo "No default version configured - set with: rbenv default <version>"
+  fi
+else
+  # Make sure the specified version is installed
+  rbenv-prefix "$RBENV_VERSION" >/dev/null
 
-echo "$RBENV_VERSION" > "${HOME}/.rbenv/default"
+  echo "$RBENV_VERSION" > "$VERSION_FILE"
+fi

libexec/rbenv-help

@@ -22,8 +22,8 @@ case "$1" in
 Some useful rbenv commands are:
    commands      List all commands
    rehash        Rehash rbenv shims (run this after installing binaries)
-   default       Set the default Ruby version
-   local         Set a local directory-specific Ruby version
+   default       Set or show the default Ruby version
+   local         Set or show the local directory-specific Ruby version
    version       Show the current Ruby version
    versions      List all Ruby versions known by rbenv
 

libexec/rbenv-local

@@ -1,12 +1,17 @@
 #!/usr/bin/env bash -e
 
 RBENV_VERSION="$1"
+VERSION_FILE=".rbenv-version"
 if [ -z "$RBENV_VERSION" ]; then
-  echo "usage: rbenv local VERSION" >&2
-  exit 1
-fi
+  if [[ -e "$VERSION_FILE" ]]; then
+    cat "$VERSION_FILE"
+  else
+    echo "No local version configured - set with: rbenv local <version>"
+  fi
+else
+  # Make sure the specified version is installed
+  rbenv-prefix "$RBENV_VERSION" >/dev/null
 
-# Make sure the specified version is installed
-rbenv-prefix "$RBENV_VERSION" >/dev/null
+  echo "$RBENV_VERSION" > "$VERSION_FILE"
+fi
 
-echo "$RBENV_VERSION" > .rbenv-version