pyenv/libexec/pyenv-version

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#!/usr/bin/env bash
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# Summary: Show the current Python version and its origin
#
# Shows the currently selected Python version and how it was
# selected. To obtain only the version string, use `pyenv
# version-name'.
set -e
[ -n "$PYENV_DEBUG" ] && set -x
exitcode=0
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OLDIFS="$IFS"
IFS=: PYENV_VERSION_NAMES=($(pyenv-version-name)) || exitcode=$?
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IFS="$OLDIFS"
for PYENV_VERSION_NAME in "${PYENV_VERSION_NAMES[@]}"; do
echo "$PYENV_VERSION_NAME (set by $(pyenv-version-origin))"
done
exit $exitcode