pyenv/libexec/pyenv-version-origin

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#!/usr/bin/env bash
# Summary: Explain how the current Python version is set
set -e
[ -n "$PYENV_DEBUG" ] && set -x
unset PYENV_VERSION_ORIGIN
OLDIFS="$IFS"
IFS=$'\n' scripts=(`pyenv-hooks version-origin`)
IFS="$OLDIFS"
for script in "${scripts[@]}"; do
source "$script"
done
if [ -n "$PYENV_VERSION_ORIGIN" ]; then
echo "$PYENV_VERSION_ORIGIN"
elif [ -n "$PYENV_VERSION" ]; then
echo "PYENV_VERSION environment variable"
else
pyenv-version-file
fi