pyenv/libexec/rbenv-version-name

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#!/usr/bin/env bash
# Summary: Show the current Ruby version
set -e
[ -n "$RBENV_DEBUG" ] && set -x
if [ -z "$RBENV_VERSION" ]; then
RBENV_VERSION_FILE="$(rbenv-version-file)"
RBENV_VERSION="$(rbenv-version-file-read "$RBENV_VERSION_FILE" || true)"
fi
if [ -z "$RBENV_VERSION" ] || [ "$RBENV_VERSION" = "system" ]; then
echo "system"
exit
fi
version_exists() {
local version="$1"
[ -d "${RBENV_ROOT}/versions/${version}" ]
}
if version_exists "$RBENV_VERSION"; then
echo "$RBENV_VERSION"
elif version_exists "${RBENV_VERSION#ruby-}"; then
{ echo "rbenv: ignoring extraneous \`ruby-' prefix in version \`${RBENV_VERSION}'"
echo "(set by $(rbenv-version-origin))"
} >&2
echo "${RBENV_VERSION#ruby-}"
else
echo "rbenv: version \`$RBENV_VERSION' is not installed" >&2
exit 1
fi