fix: PATH update for non-fish shells

Checks PATH variable for existing inclusion of shims
for shells other than fish.

See PR #430

Author: keikoro

Diff for: bin/pyenv-virtualenv-init

@@ -95,8 +95,10 @@ EOS
   ;;
 * )
   cat <<EOS
-export PATH="${PYENV_VIRTUALENV_ROOT:-${PYENV_VIRTUALENV_INSTALL_PREFIX}}/shims:\${PATH}";
-export PYENV_VIRTUALENV_INIT=1;
+if [[ ":$PATH:" != *"${PYENV_VIRTUALENV_ROOT:-${PYENV_VIRTUALENV_INSTALL_PREFIX}}/shims"* ]]; then
+  export PATH="${PYENV_VIRTUALENV_ROOT:-${PYENV_VIRTUALENV_INSTALL_PREFIX}}/shims:\${PATH}";
+  export PYENV_VIRTUALENV_INIT=1;
+fi
 EOS
   ;;
 esac

Diff for: test/init.bats

@@ -50,8 +50,10 @@ load test_helper
   run pyenv-virtualenv-init - bash
   assert_success
   assert_output <<EOS
-export PATH="${TMP}/pyenv/plugins/pyenv-virtualenv/shims:\${PATH}";
-export PYENV_VIRTUALENV_INIT=1;
+if [[ ":$PATH:" != *"${TMP}/pyenv/plugins/pyenv-virtualenv/shims"* ]]; then
+  export PATH="${TMP}/pyenv/plugins/pyenv-virtualenv/shims:\${PATH}";
+  export PYENV_VIRTUALENV_INIT=1;
+fi
 _pyenv_virtualenv_hook() {
   local ret=\$?
   if [ -n "\${VIRTUAL_ENV-}" ]; then
@@ -93,8 +95,10 @@ EOS
   run pyenv-virtualenv-init - zsh
   assert_success
   assert_output <<EOS
-export PATH="${TMP}/pyenv/plugins/pyenv-virtualenv/shims:\${PATH}";
-export PYENV_VIRTUALENV_INIT=1;
+if [[ ":$PATH:" != *"${TMP}/pyenv/plugins/pyenv-virtualenv/shims"* ]]; then
+  export PATH="${TMP}/pyenv/plugins/pyenv-virtualenv/shims:\${PATH}";
+  export PYENV_VIRTUALENV_INIT=1;
+fi
 _pyenv_virtualenv_hook() {
   local ret=\$?
   if [ -n "\${VIRTUAL_ENV-}" ]; then