pyenv/libexec/rbenv-version-file

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#!/usr/bin/env bash
# Summary: Detect the file that sets the current rbenv version
set -e
[ -n "$RBENV_DEBUG" ] && set -x
find_local_version_file() {
local root="$1"
while [ -n "$root" ]; do
if [ -e "${root}/.rbenv-version" ]; then
echo "${root}/.rbenv-version"
exit
fi
root="${root%/*}"
done
}
find_local_version_file "$RBENV_DIR"
[ "$RBENV_DIR" = "$PWD" ] || find_local_version_file "$PWD"
global_version_file="${RBENV_ROOT}/version"
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if [ -e "$global_version_file" ]; then
echo "$global_version_file"
elif [ -e "${RBENV_ROOT}/global" ]; then
echo "${RBENV_ROOT}/global"
elif [ -e "${RBENV_ROOT}/default" ]; then
echo "${RBENV_ROOT}/default"
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else
echo "$global_version_file"
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fi