- #!/usr/bin/env bash
- #
- # Summary: Set or show the shell-specific Python version
- #
- # Usage: pyenv shell <version>...
- # pyenv shell -
- # pyenv shell --unset
- #
- # Sets a shell-specific Python version by setting the `PYENV_VERSION'
- # environment variable in your shell. This version overrides local
- # application-specific versions and the global version.
- #
- # <version> should be a string matching a Python version known to pyenv.
- # The special version string `system' will use your default system Python.
- # Run `pyenv versions' for a list of available Python versions.
- #
- # When `-` is passed instead of the version string, the previously set
- # version will be restored. With `--unset`, the `PYENV_VERSION`
- # environment variable gets unset, restoring the environment to the
- # state before the first `pyenv shell` call.
-
- set -e
- [ -n "$PYENV_DEBUG" ] && set -x
-
- # Provide pyenv completions
- if [ "$1" = "--complete" ]; then
- echo --unset
- echo system
- exec pyenv-versions --bare
- fi
-
- versions=("$@")
- shell="$(basename "${PYENV_SHELL:-$SHELL}")"
-
- if [ -z "$versions" ]; then
- if [ -z "$PYENV_VERSION" ]; then
- echo "pyenv: no shell-specific version configured" >&2
- exit 1
- else
- echo 'echo "$PYENV_VERSION"'
- exit
- fi
- fi
-
- if [ "$versions" = "--unset" ]; then
- case "$shell" in
- fish )
- echo 'set -gu PYENV_VERSION_OLD "$PYENV_VERSION"'
- echo "set -e PYENV_VERSION"
- ;;
- * )
- echo 'PYENV_VERSION_OLD="$PYENV_VERSION"'
- echo "unset PYENV_VERSION"
- ;;
- esac
- exit
- fi
-
- if [ "$versions" = "-" ]; then
- case "$shell" in
- fish )
- cat <<EOS
- if set -q PYENV_VERSION_OLD
- if [ -n "\$PYENV_VERSION_OLD" ]
- set PYENV_VERSION_OLD_ "\$PYENV_VERSION"
- set -gx PYENV_VERSION "\$PYENV_VERSION_OLD"
- set -gu PYENV_VERSION_OLD "\$PYENV_VERSION_OLD_"
- set -e PYENV_VERSION_OLD_
- else
- set -gu PYENV_VERSION_OLD "\$PYENV_VERSION"
- set -e PYENV_VERSION
- end
- else
- echo "pyenv: PYENV_VERSION_OLD is not set" >&2
- false
- end
- EOS
- ;;
- * )
- cat <<EOS
- if [ -n "\${PYENV_VERSION_OLD+x}" ]; then
- if [ -n "\$PYENV_VERSION_OLD" ]; then
- PYENV_VERSION_OLD_="\$PYENV_VERSION"
- export PYENV_VERSION="\$PYENV_VERSION_OLD"
- PYENV_VERSION_OLD="\$PYENV_VERSION_OLD_"
- unset PYENV_VERSION_OLD_
- else
- PYENV_VERSION_OLD="\$PYENV_VERSION"
- unset PYENV_VERSION
- fi
- else
- echo "pyenv: PYENV_VERSION_OLD is not set" >&2
- false
- fi
- EOS
- ;;
- esac
- exit
- fi
-
- # Make sure the specified version is installed.
- if pyenv-prefix "${versions[@]}" >/dev/null; then
- OLDIFS="$IFS"
- IFS=: version="${versions[*]}"
- IFS="$OLDIFS"
- if [ "$version" != "$PYENV_VERSION" ]; then
- case "$shell" in
- fish )
- echo 'set -gu PYENV_VERSION_OLD "$PYENV_VERSION"'
- echo "set -gx PYENV_VERSION \"$version\""
- ;;
- * )
- echo 'PYENV_VERSION_OLD="$PYENV_VERSION"'
- echo "export PYENV_VERSION=\"${version}\""
- ;;
- esac
- fi
- else
- echo "false"
- exit 1
- fi
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