pyenv/libexec/pyenv-version-name

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#!/usr/bin/env bash
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# Summary: Show the current Python version
set -e
[ -n "$PYENV_DEBUG" ] && set -x
if [ -n "$PYENV_VERSION" ]; then
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IFS=: versions=($(echo "${PYENV_VERSION}"))
else
PYENV_VERSION_FILE="$(pyenv-version-file)"
IFS=: versions=($(pyenv-version-file-read "$PYENV_VERSION_FILE" || true))
IFS=: PYENV_VERSION="${versions[*]}"
export PYENV_VERSION
fi
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if [ -z "$versions" ]; then
echo "system"
exit
fi
for version in "${versions[@]}"; do
PYENV_VERSION_PATH="${PYENV_ROOT}/versions/${version}"
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if [ "$version" != "system" ] && [ ! -d "$PYENV_VERSION_PATH" ]; then
echo "pyenv: version \`$version' is not installed" >&2
exit 1
fi
done
echo "${PYENV_VERSION}"