#!/usr/bin/env bash
# Emit "<upstream-tag>-seth<N>" version string to stdout.
# Pure logic: no side effects.
#
# CALLER RESPONSIBILITY (per spec §5.4): the local tag db must be fresh.
# If invoked outside the release flow, run `git fetch origin --tags` first
# or risk a stale <N> value.
#
# Spec: sethlabels-docs/specs/2026-04-29-packaging-design.md §5.4 (D4)
set -euo pipefail

upstream_tag=$(git describe --tags --abbrev=0 upstream/master)
existing_count=$(git tag --list "${upstream_tag}-seth*" | wc -l | tr -d ' ')
next_n=$((existing_count + 1))
echo "${upstream_tag}-seth${next_n}"