created new project.

modified rbenv source for Python and renamed to pyenv.

libexec/pyenv-prefix

@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+set -e
+[ -n "$PYENV_DEBUG" ] && set -x
+
+# Provide pyenv completions
+if [ "$1" = "--complete" ]; then
+  echo system
+  exec pyenv-versions --bare
+fi
+
+if [ -n "$1" ]; then
+  export PYENV_VERSION="$1"
+elif [ -z "$PYENV_VERSION" ]; then
+  PYENV_VERSION="$(pyenv-version-name)"
+fi
+
+if [ "$PYENV_VERSION" = "system" ]; then
+  PYTHON_PATH="$(pyenv-which python)"
+  echo "${PYTHON_PATH%/*}"
+  exit
+fi
+
+PYENV_PREFIX_PATH="${PYENV_ROOT}/versions/${PYENV_VERSION}"
+if [ ! -d "$PYENV_PREFIX_PATH" ]; then
+  echo "pyenv: version \`${PYENV_VERSION}' not installed" >&2
+  exit 1
+fi
+
+echo "$PYENV_PREFIX_PATH"