pyenv/libexec/pyenv-sh-shell

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#!/usr/bin/env bash
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#
# Summary: Set or show the shell-specific Python version
#
# Usage: pyenv shell <version>
# 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.
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 "$shell" in
fish )
echo "set -e PYENV_VERSION"
;;
* )
echo "unset PYENV_VERSION"
;;
esac
exit
fi
# Make sure the specified version is installed.
if pyenv-prefix "${versions[@]}" >/dev/null; then
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OLDIFS="$IFS"
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IFS=: version="${versions[*]}"
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IFS="$OLDIFS"
case "$shell" in
fish )
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echo "setenv PYENV_VERSION \"${version}\""
;;
* )
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echo "export PYENV_VERSION=\"${version}\""
;;
esac
else
echo "false"
exit 1
fi