created new project.

modified rbenv source for Python and renamed to pyenv.

libexec/pyenv-version-name

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+set -e
+[ -n "$PYENV_DEBUG" ] && set -x
+
+if [ -z "$PYENV_VERSION" ]; then
+  PYENV_VERSION_FILE="$(pyenv-version-file)"
+  PYENV_VERSION="$(pyenv-version-file-read "$PYENV_VERSION_FILE" || true)"
+fi
+
+if [ -z "$PYENV_VERSION" ] || [ "$PYENV_VERSION" = "system" ]; then
+  echo "system"
+  exit
+fi
+
+PYENV_VERSION_PATH="${PYENV_ROOT}/versions/${PYENV_VERSION}"
+
+if [ -d "$PYENV_VERSION_PATH" ]; then
+  echo "$PYENV_VERSION"
+else
+  echo "pyenv: version \`$PYENV_VERSION' is not installed" >&2
+  exit 1
+fi