#!/usr/bin/env bash
set -eu

cd "$(dirname "$0")/.."
remote="$(git config zulip.zulipRemote)" || remote=upstream
{
    git describe --always --tags --match='[0-9]*'
    if [ -z "${OVERRIDE_MERGE_BASE+x}" ]; then
        branches="$(git for-each-ref --format='%(objectname)' "refs/remotes/$remote/main" "refs/remotes/$remote/*.x" "refs/remotes/$remote/*-branch")"
        mapfile -t branches <<<"$branches"
        if merge_base="$(git merge-base -- HEAD "${branches[@]}")"; then
            git describe --always --tags --match='[0-9]*' -- "$merge_base"
        fi
    else
        echo "$OVERRIDE_MERGE_BASE"
    fi
} >zulip-git-version