Add support for RBENV_VERSION=system

libexec/rbenv-prefix

@@ -6,6 +6,12 @@ elif [ -z "$RBENV_VERSION" ]; then
   RBENV_VERSION="$(rbenv-version)"
 fi
 
+if [ "$RBENV_VERSION" = "system" ]; then
+  RUBY_PATH="$(rbenv-which ruby)"
+  echo "${RUBY_PATH%/*}"
+  exit
+fi
+
 RBENV_PREFIX_PATH="${HOME}/.rbenv/versions/${RBENV_VERSION}"
 if [ ! -d "$RBENV_PREFIX_PATH" ]; then
   echo "rbenv: version \`${RBENV_VERSION}' not installed" >&2

libexec/rbenv-version

@@ -36,6 +36,11 @@ if [ -z "$RBENV_VERSION" ]; then
   fi
 fi
 
+if [ "$RBENV_VERSION" = "system" ]; then
+  echo "$RBENV_VERSION"
+  exit
+fi
+
 RBENV_VERSION_PATH="${HOME}/.rbenv/versions/${RBENV_VERSION}"
 
 if [ -d "$RBENV_VERSION_PATH" ]; then

libexec/rbenv-which

@@ -1,8 +1,35 @@
 #!/usr/bin/env bash -e
 
+expand_path() {
+  local cwd="$(pwd)"
+  cd "$1"
+  pwd
+  cd "$cwd"
+}
+
+remove_from_path() {
+  local path_to_remove="$(expand_path "$1")"
+  local result=""
+
+  for path in ${PATH//:/$'\n'}; do
+    path="$(expand_path "$path" || true)"
+    if [ "$path" != "$path_to_remove" ]; then
+      result="${result}${path}:"
+    fi
+  done
+
+  echo "${result%:}"
+}
+
 RBENV_VERSION="$(rbenv-version)"
 RBENV_COMMAND="$1"
-RBENV_COMMAND_PATH="${HOME}/.rbenv/versions/${RBENV_VERSION}/bin/${RBENV_COMMAND}"
+
+if [ "$RBENV_VERSION" = "system" ]; then
+  PATH="$(remove_from_path "${HOME}/.rbenv/shims")"
+  RBENV_COMMAND_PATH="$(command -v "$RBENV_COMMAND")"
+else
+  RBENV_COMMAND_PATH="${HOME}/.rbenv/versions/${RBENV_VERSION}/bin/${RBENV_COMMAND}"
+fi
 
 if [ -x "$RBENV_COMMAND_PATH" ]; then
   echo "$RBENV_COMMAND_PATH"